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Cummins Repower: Installing TWO CUMMINS 6.7 Engines in our Boat [Ep. 144]

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In this awesome episode, we're finally bringing in the new Cummins 6.7 engines, named Stella 2.0 and Portia 2.0. #cumminsrepower #cummins #boatrefit
But first, we had to give the engine room a good scrub with a steam cleaner to make it spotless and ready for the new arrivals. Now, the fun part begins - we’re lowering these powerful engines right through the roof! It’s like a grand entrance for our shiny new stars.
With Stella 2.0 and Portia 2.0 onboard, our boat is going to run smoother and faster than ever. Tune in to see the whole process, from cleaning up to the big lift, with plenty of laughs and cool behind-the-scenes action.
➡️To see where it all began - check out this playlist: • A SUPERYACHT ROMANCE -...
Welcome aboard Tangaroa, where we're gearing up for the adventure of a lifetime!
Join us as we prep our aluminum beauty to set sail for Alaska, Siberia, and Japan. Don't miss out on the excitement! Subscribe now and be part of our journey.
If you want to know more about our boat and us - visit our website www.onboardtan..., and hey, why not become a valued crew member on Patreon?
For just $10 - $25 a month, you'll snag an Official Onboard Tangaroa Challenge Coin and an open invite to hop aboard for bevvies and a visit whenever our paths cross.
Here's what else you get for joining Patreon:
1️⃣ We'll talk to you on Zoom every month, and you'll get a special link in your email! 📆📹
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4️⃣ We'll be really, really thankful because you help us take care of Tangaroa!
Click here to see everything on Patreon: / onboardtangaroa1969
But wait, there's more! We have purchased, tested and reviewed quite a few products during our live onboard Tangaroa. Check out our storefront here to see what we recommend:
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Our big journey is coming! We'll go all around places like Alaska, Japan, and more! It's going to be awesome and we encourage everyone to come along for the ride.
From Blaine, Janis, Josh, Izzie, and Maggie the #boatdog
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#trawlerlife #boatlife #boatrefit #aluminumboat #aluminumtrawler #liveaboard #boatlife

Опубликовано:

22 авг 2024

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Комментарии : 145

@OnboardTangaroa 17 дней назад

If you have any questions or comments about what we are doing - make them. Blaine tries to answer every one of them over coffee in the morning. It's kinda his thing and I personally think he enjoys it! So please keep him happy and make a comment.

@laurapitre5797 2 месяца назад

The new engines look great! As far as Vietnam goes it's known as a very unfriendly place to bring a boat. Thailand is very friendly but not cheap anymore. We have been cruising Thailand and Malaysia for the last year and a half. The Philippines may be your best bet to get woodworking done. Cheers from Mojo!

@OnboardTangaroa Месяц назад

Good to know about Vietnam. We had actually heard this same info from another couple last week. May have to cruise on by! Cant wait to get to that area. Looking forward to some time in the tropics again. The Philippines would be a welcome stop. Thanks for watching!

@paulmach5 Месяц назад

If only all crane operators could be as helpful as your guy 👍

@OnboardTangaroa Месяц назад

He was awesome!

@JustinTurnerman Месяц назад

Good to see the engines made it safe from the island. Can't wait to see the first test run.

@OnboardTangaroa Месяц назад

Was good to get them here. We are very much looking forward to the first fire up as well.

@bobsch-gd6ze Месяц назад

Was by the yard today and noticed the new bottom paint. looks good.

@OnboardTangaroa Месяц назад

Thanks! Janis has been working her litte toosh off out there!

@bobsch-gd6ze Месяц назад

@@OnboardTangaroa was that her on the band saw?

@OnboardTangaroa Месяц назад

We don't have a bandsaw so definitely not her. She was likely grinding paint off of something or putting new paint on something 😁.

@billfletcher5495 2 месяца назад

Have had a QSB 6.7 for 6 years, great engine.

@OnboardTangaroa Месяц назад

I have heard many great things about them. While these are technically not QSB engines they are built with all of the internals that really matter. Thanks for watching!

@myg240z Месяц назад

Nice "safety squint" while using the steam cleaner, lol!

@OnboardTangaroa Месяц назад

Lol, would have been impossible to wear anything and still see anything. Was fun and miserable at the same time.

@bnkwupt Месяц назад

Woohoo! After three weeks of binge watching from the beginning, I’m finally caught up. Gotta admit, I’ll miss the road of the Detroits, but the Cummins will be much better power plants for Tangaroa.

@OnboardTangaroa Месяц назад

Wow! You have been busy. Never though of ourselves as being bingeworthy 🤣. I agree that the new engines will be a better match for our cruising style. Glad you are enjoying the videos. Take care.

@markhuston9250 2 месяца назад

Monster project………..with a very talented couple on it! 👍🏼

@OnboardTangaroa Месяц назад

Thanks! It will be good to get it behind us. We are ready to get back in the water. Take care!

@claudeross126 2 месяца назад

I love shiny new red engines 😅😅

@OnboardTangaroa Месяц назад

As do we!

@NotGhostShark 2 месяца назад

Awesome to see the progress, can't wait to have you two home. Love you!

@OnboardTangaroa Месяц назад

Looking forward to seeing you guys as well. Love you bud!

@fstlnj29 2 месяца назад

Torn. Great to see the engines in but getting the goo out of the bilge had to feel great!

@OnboardTangaroa Месяц назад

One of my biggest annoyances with the engine room was the inability to keep the bilges clean. We would have to add 4L of oil on every trip we did. It had to go somewhere! Should be much better now, at least for the first while. Thanks for watching!

@nathansandwich5579 2 месяца назад

love the build❤

@OnboardTangaroa Месяц назад

Thanks! We are slowly getting there. This should be the last massive project onboard. Take care!

@chuckfountain620 Месяц назад

Great video!❤

@OnboardTangaroa Месяц назад

Glad you liked it!!

@chrisredshaw7150 2 месяца назад

great to see new motors go in will love to see how much more power there will be?

@OnboardTangaroa Месяц назад

We are pretty excited. The new engines will likely be derated to provide less power than the originals for longevity. We only need 250HP total to reach hull speed so even derated they have enough power even for emergencies. The fuel consumption will be massively less than the original engines though. Thanks for watching!

@chrisredshaw7150 Месяц назад

@@OnboardTangaroa your very welcome when do you put new shows out?

@OnboardTangaroa Месяц назад

Janis puts new long videos out every Sunday and a couple of shorts during the week.

@chrisredshaw7150 Месяц назад

@@OnboardTangaroa ok thank you

@wildcoyote34 Месяц назад

@@OnboardTangaroa those 6.7 liter cummins engines easily produce as much horsepower as the old 12V71s ,,you'll have a much neater and cleaner engine room too cause the cummins engines have about 40 less joints to leak oil from ,,i personally own a couple 12V-71 detroit engines and the damn things leak oil more than any other detroit engine i have owned

@albertomoniz9051 Месяц назад

I'm not an engineer by all mean but some things just don't make sense. You pulled 2 engines out that were probably rated at 575 hp , 1550 torque each which if I had to travel in big seas and angry waves.I think to myself I would perfere to an set up that can climb over mountains for hours or day with ease then on that has to be operating at 80% most of the time. 6.7 can reach 500 -600 hp but but you won't run peak hp long periods and you'll never reach 1550 torque which pushes you through the water. That combination is great if your doing Island hopping , but man north Pacific dam. Good luck and wish you guys well. It's your boat to do with watch ever you want and I'm just giving my opinion and not bashing.

@OnboardTangaroa Месяц назад

Its not really that the new engines are too small. Its that the original engines were way oversize, (from a shear mass standpoint) even in heavy seas. The engines that came out were rated at 445hp and 1200 ft/lbs of torque. These were mated up to 2:1 gearboxes. The new engines, while being easily capable of 450hp, will be tuned to around the 300hp and somewhere between the 800-1000 ft/lb range. These are bolted up to 3:1 gearboxes With the gear reduction the prop shaft torque ends up being almost identical to the original Detroits. As for HP seeing as this boat only needs 250 hp TOTAL to reach hull speed (confirmed by fuel burn on original engines) that's less than 50% load with tons extra for emergencies and will hardly ever be run there. We will usually be cruising at 9 knots and 150hp total. When you have a moment google "FPB Boats". These were designed by one of the most well know ocean cruisers and are tanks. Their 78' model uses twin 6.7 Deere's and go EVERYWHERE with ease. Don't worry, a ton of thought went into this repower. Thanks for watching!

@mattbrown9484 Месяц назад

You lost 33% of thrust. Can you climb 30 ft with what is left?

@OnboardTangaroa Месяц назад

We have lost 33% of HP but zero shaft torque loss due to the change in gear ratio. Seeing as the 33% HP loss is all above hull speed and with the new engines having 40-50% reserve of power there really is no loss. When climbing 30 ft it will still have the same shaft torque that it had before. The prop will still be churning away at the same rpm. Thant's an extremely simplified explanation but hopefully it gets my point across. If we do need additional HP ever the engines can be increased with simple tuning however it would make little difference in the case of big seas. Regardless, hopefully we are smart enough to avoid 30 ft seas.

@mattbrown9484 Месяц назад

@@OnboardTangaroa - so youre max engine rpm is increased vs the Detroits to acheive the same max wheel rpm?

@OnboardTangaroa Месяц назад

Correct. Our Detroits were the 2100 RPM rated units. The new engines are rated up to 3000 rpm.

@Graveltrucking Месяц назад

You'll never get rid of green grenade slime, 2stroke engine oil doesn't come off, get it on your hands you are wearing it off lol, it looks like you got it clean enough. Years ago an old guy said you want to get revenge on somebody with an aluminum boat throw some copper pennies in the bilge. Copper is a no go anywhere on aluminum boats. Did the bottom paint on my ex boss's 24 foot Duckworth aluminum boat. There was a little spot on the hull caught my eye, that little spot ended up me grinding all the antifoul paint to find the hull covered with pits. I was sick to my stomach to see that the boat at that time was maybe 2 years old. I just came across your YT channel. Going from a pair of buzzin dozen fuel pigs to a pair of 6.7 Cummins that's a big difference in rotating mass. It will be curious to see how your guys boat does with the smaller engines. Your fuel consumption will be drums per hour to Jerry cans per hour. The Detroit diesel drone will be a thing of the past, the Tangaroa won't be vibrating like a harmonica.

@OnboardTangaroa Месяц назад

While I have my doubts that any Detroit 2 stroke can stay dry for long (as many Detroit lovers claim they can) I cannot completely blame the state of the bilge on the engines. They were incredibly neglected by previous owner/s. When we bought the boat we never intended to repower. I actually kind of liked the old Detroits, faults and all. That being said, we have zero doubts/regrets about the decision to repower at this point. Getting all (or at least most😁) of the slime out was a great feeling. The hull on Tangaroa is not in terrible shape however I wonder how much better it would be if the copper was never there. There is certainly some pitting in the bilges but its marginal and the plating is plenty thick. There are a couple of spots in other non-hull areas that had direct copper contact and its unreal the amount of deterioration there is. I can only imagine how I would feel to find the hull like your ex-boss's boat. Definitely a lot of difference in the rotating mass of the Cummins engines compared to the Detroits. The additional 900 usable rpm allows us to use a 3:1 gearbox though compared to the 2:1 units on the Detroits which negates most of the torque difference between the two engines. I also used pretty heavy flywheels on the 6.7s to help with transient loading. Cant wait to see the difference. From a fuel and noise standpoint it will be immense. Thanks for watching!

@melvinrawlings1457 Месяц назад

Im surprised that yall dont have way more subscribers than yall do. Because yalls channel is awesome. Anways much love to ya from Maryland❤❤❤.

@OnboardTangaroa Месяц назад

Glad you are enjoying it! Thanks for watching!

@Adam-en4zm Месяц назад

Very impressive work guys, as usual. Are there any videos of you test firing the engines on the "bench"? I bet they sound amazing.

@OnboardTangaroa Месяц назад

Sadly, no videos of a test fire. I ran out of time to get them fired before they went in. Taking a bit of a chance but we aren't sealing everything back up till after the sea trial so if there are issues we can deal with them. I am confident all will be well though. Take care!

@Adam-en4zm Месяц назад

@@OnboardTangaroa Wow, that's a big play, or it would be for me anyhow. You've done a bunch of rebuilds, so I'm sure it's not nearly as likely something goes amiss as it would be if I worked on it. Are you going to be installing the genset at anchor, or is that also being done on the hard?

@OnboardTangaroa Месяц назад

I am pretty confident with the engines for sure. The genset will be built at anchor. We just got it onboard to save the trouble of having to hand bomb it around when we were at anchor. I am actually working on getting a generator head as well to put onboard while we are hauled out.

@Adam-en4zm Месяц назад

@@OnboardTangaroa Can't wait to see the propulsion engines firing up! Good luck with the rest of the project.

@OnboardTangaroa Месяц назад

We can't wait either.... BLAINE!!!! GET THOSE ENGINES STARTED!

@RenegadeADV Месяц назад

First one of your videos I have seen, quite a nice boat you all are putting together there. I am just south of you all in WA working on my Sailboat right now.

@OnboardTangaroa Месяц назад

Welcome to the channel. She is a lot of work but we love her. Are you hauled out or trying to do stuff in the water? We prefer to do stuff in the water if we can.

@RenegadeADV Месяц назад

@@OnboardTangaroa I am hauled, my shaft log started leaking on the way back from Alaska last year, it is a bronze tube, old style like they used on wooden boats, so I am going to remove it all, bore a bigger hole and put a G10 tube in to replace it that will never corrode again. While the engine is out redoing the entire space in there making it all ship shape again, she is a 1966 build, so well past due for it!

@OnboardTangaroa Месяц назад

Certainly got lots of life out of that one! Good luck with everything. I hope it all goes great for you.

@RenegadeADV Месяц назад

@@OnboardTangaroa Thanks! Will be looking forward to seeing yours come together, might even see you all this coming spring when we head north to Alaska again!

@OnboardTangaroa Месяц назад

Maybe so. If not around here we plan to be in Alaska for winter 2025. Hoping to winter in Wrangell.

@erichildebrandt9802 Месяц назад

way to go guys

@OnboardTangaroa Месяц назад

Thanks Eric!

@Razzleberry82 28 дней назад

Cool show

@OnboardTangaroa 27 дней назад

Thanks for watching!

@danielgriffith7694 Месяц назад

FYI, originally those engines were manufactured in Rocky Mount, North Carolina. Where I work. Also they should have been painted white, so that you can detect any leaks .

@OnboardTangaroa Месяц назад

Right on! Unfortunately, I don't do white engines even though I know the reasoning for it. I am not overly concerned with not being able to find leaks. Thanks for watching!

@jmsask 2 месяца назад

Great milestone 🍻

@OnboardTangaroa Месяц назад

Huge! Thanks for watching!

@jmsask Месяц назад

@@OnboardTangaroa I'm here to watch your journey now I'm hooked

@OnboardTangaroa Месяц назад

Hopefully we can continue to keep you entertained!

@jmsask Месяц назад

@@OnboardTangaroa everything your doing is a dream I can never live so watching your videos I can live vicariously through you 🍻

@OnboardTangaroa Месяц назад

That is the biggest compliment you could ever give us. Thank you. If there is anything you want to see in the videos just let us know.

@curtshelp6170 Месяц назад

Detroits are amazingly durable and can be fueled with garbage fuel, and the sound!!! Thirsty though.

@OnboardTangaroa Месяц назад

I had a guy tell me once you could run them on owl piss 😂. The cam driven injectors and lack of injection pump certainly make them reliable. Thanks for watching!

@bugsternc 2 месяца назад

hello, at the time of writing this message, I don't know if the engines are already permanently in place but I think that you should have put a drain valve with a pipe at the outlet of the oil pan.. ....with a suitable pump you would have been able to drain the engines more efficiently........

@OnboardTangaroa Месяц назад

Both engines have fittings in the bottom of the pan with a hose run to the inboard side for access. Definitely the way to go. Take care!

@brentlance2379 2 месяца назад

Ahh.i cant watch it right now.on couch cooling off for a minute.been out tearing rear end out of a 1947 bus. Have to use to to go save another one out of a junk yard in Va

@OnboardTangaroa Месяц назад

Oh, that sounds like a lot of fun. Good luck!

@rogerreed905 Месяц назад

Well done team . A very satisfying job done . . . Are the new engines brand new or recons and im guessing the old ones were traded ?? Take care . Bye from NZ👋🍻🇳🇿twa

@OnboardTangaroa Месяц назад

Oh man, it feels good to get the engine room cleaned. The new engines are remans that were done by myself. They are built with all of the internals from a QSB 550. Take care.

@Rs500ybd Месяц назад

Boat Sludge Mint.

@OnboardTangaroa Месяц назад

Super lovely to deal with that stuff.

@franklinrhodevelt6441 Месяц назад

It doesn't matter which metals you use in a boat, as long as it is all bonded properly

@OnboardTangaroa Месяц назад

I cannot begin to express how much I (and many many other people with aluminum boats) disagree with this statement. Thanks for watching!

@franklinrhodevelt6441 Месяц назад

@@OnboardTangaroa Have you found any grade 5, grade 8, or screws, nuts, bolts that are aluminum? Dissimilar metals fastened together will always be a problem. Anti-seize, and wire to wire bonding, and anodes, greatly reduces the galvanic action of electrolysis.

@OnboardTangaroa Месяц назад

I have indeed not seen any grade 5 or grade 8 aluminum fasteners however that is mainly due to the fact that those are specs for steel fasteners only and aluminum wouldn't have the tensile strength to meet the specs of those grades anyhow. I have seen standard aluminum bolts though as well as aluminum nuts. Sorry if I missed your point there. I agree that technically you could use bonding on components to reduce galvanic action within each of those components. My point with not having copper on an aluminum boat (wiring not withstanding) is that those pipes and components will begin to surface corrode which leads to copper ions leaching into the bilge. Those ions in direct contact with the aluminum in a damp environment wreak havoc with the aluminum hull plating. Aluminum is also very good at forming surface layers of oxides which can cause high resistance at electrical attachment points such as bonding points. Once that happens the bonding has been compromised. Best to just leave copper out of the mix on an aluminum boat.

@franklinrhodevelt6441 Месяц назад

@@OnboardTangaroa It good to see someone as technically involved in solving issues as you are. Thanks

@OnboardTangaroa Месяц назад

I try my best!

@user-qi7bq8ig4o Месяц назад

Stainless should be insulated from Aluminium. There are several excellent non metallic fuel lines available . If you insist on using Aluminium , you may as we leave the current fuel lines in place, and save yourself some cost and effort.

@OnboardTangaroa Месяц назад

We will be using hose for all of the runs from the manifolds to the engines. Never had any plans on using aluminum for the fuel lines. Thanks for watching!

@user-qi7bq8ig4o Месяц назад

@@OnboardTangaroa I was responding to your comment that you were removing the old alloy lines and replacing them with stainless lines.

@OnboardTangaroa Месяц назад

Sorry, Janis makes the videos and I don't always get to watch them right away. I had thought about stainless lines but they are not approved by ABYC so I ditched that idea. The stainless does have some reaction with the aluminum but not nearly as bad as the copper. It also doesn't leach corrosive ions into the bilge like the copper which was my main gripe. The main reason why ABYC doesn't like stainless is due to work hardening and cracking. I figured if I was going to redo them I might as well make them ABYC compliant though. I suppose hose is a lot easier to work with and I need to save all the time I can at this point.

@arczealdesigns9512 Месяц назад

What no bilge cleaning service available? cause that looks like a pain in the butt!🤣

@OnboardTangaroa Месяц назад

I'm sure there may be around here but then we would miss out on all the fun! 🤣

@georgemichael2844 2 дня назад

Is a video out cruising with the new engines ?

@OnboardTangaroa 2 дня назад

Not yet! But stay tuned because there will certainly be.

@captainron7904 Месяц назад

Why the 6.7 electronic Cummins if it was me I would have stuck a couple 5.9 12v Cummins in or a couple older John Deere mechanical diesels. Those electronics engines are a pain to troubleshoot and very expensive when they do need parts.

@OnboardTangaroa Месяц назад

The 6.7 electronics have a few benefits over the mechanicals. The main benefit being substantially reduced noise levels. A common rail injector can inject more than one pulse per cycle. This allows a pilot injection pulse that smooths the main injection pressure spike and almost eliminates diesel rattle. It doesn't seem like a big deal but when you are on a trip for days at a time quiet engines are nice. It is also easier on the engine allowing them to make more power safely. I have been working predominately with electronic engines for the last 13 years and I am VERY comfortable with them. Troubleshooting is not an issue. Injectors are the only thing that are more expensive over the mechanicals. Sure, they have sensors and such but those have a very low failure rate and are not all that expensive. The most critical thing is making sure the engines get clean clean fuel. The common rail stuff is super sensitive to that. Thanks for watching!

@keeganpock864 7 дней назад

You got rid of Detroit’s for those!!?

@OnboardTangaroa 7 дней назад

Happily.

@dongalloway6888 26 дней назад

Far be it for me to act like I know what the hell I'm talking about here... So I'll preface it as "Dumb" question's from a fairly new subscriber... In my defence... I do have experience with hazardous materials... as both a former firefighter... and Haz Mat specialist...add in heavy construction... millwright... LoL... the list goes on... including restoring a couple of boats... small ones... Question #1... In a previous video, when you were painting the one muffler outside... Did I hear you say that the "Muffler's"... had asbestos in them??? I know enough to say that as long as the outer containment covering or shell is not damaged.. then the asbestos should not only be contained... but hopefully should remain that way>>> So this leads me to my second question... Those "Monster Engines that were previously in the boat, absolutely required "Monster" Mufflers... Do the new Cummin's also require that large of a muffler... My mind set would be that the new engines are tuned for both "Specific Intake, and Exhaust"... requirements.... Could those old school Mufflers possibly create a problem, with not having enough back pressure... that's required for the newer engines... Just a dumb old guys thoughts!!! Just stumbled on your page the other day, and am already "Binge" watching your video's... I'm 100% into watching the "Restoration" video's... Not so much the sailing and cruising video's... so considering that a couple of the channels that I have been watching have finished their builds... and have now launched... Y'all are my newest interest!!! Keep up the great work!!! LOve what you're doing!!!

@OnboardTangaroa 25 дней назад

Welcome to the channel! Glad you found us. The mufflers are indeed lagged in asbestos and are fairly well encapsulated still which was why we chose to keep them. New "marine" exhaust silencers are ridiculously overpriced for what they are and these work quite well so they are being reused. Engines requiring back pressure is a bit of an myth that has perpetuated over the years. Engines do not require backpressure however a well designed exhaust system can actually improve scavenging from individual cylinders. That being said, the new engines are turbocharged and with turbocharged engines the less pressure after the turbo the better. The oversized mufflers from the 14L two strokes should not only keep restriction to a minimum, they will also be very effective at keeping exhaust noise low. There are some design parameters for the mufflers that are based around engine speeds and noise frequencies but these should do just fine. If we ever have a muffler failure we will change them out at that point. Until then we "run what we brung". So happy you are enjoying the channel. We will be cruising but I imagine we will be in a perpetual state of refit judging by what still needs to be done. Hopefully we can keep you entertained for a while! Take care.

@danielgriffith7694 Месяц назад

Looks like the engines have brakes on them. Also why aren’t they painted white for a marine environment?

@OnboardTangaroa Месяц назад

I am not sure what you are seeing but no, they do not have brakes on them. The technical reason why they don't have white paint is that I didn't want white engines 😂. The going reasoning for white engines it the ability to tell when you have a leak. After many years of being a tech what I have determined is regardless of color there is never any issue noticing if you have a leak. 😁 Thanks for watching!

@user-oj1ri5ld3x Месяц назад

In the new engines well you running bio diesel

@OnboardTangaroa Месяц назад

It is unlikely that we will as it would be difficult to make that happen in many of the places we will be going. I have had several people ask this though. May be worth looking into at some point.

@bnkwupt Месяц назад

Don’t do it. The high pressure fuel pumps are the weakest link, and the most critical component. As you know, they’re very intolerant of substandard fuel, and biodiesel is tricky at best.

@OnboardTangaroa Месяц назад

I don't think it would really work out anyway. Would be incredibly difficult to have all of the stuff on board for producing it and many of the places we plan to go it would be impossible to get anything to produce it. The pumps are sensitive for sure. Fortunately we are using the CP3. My filtration system should handle any water and particles which are the big killers. For lubricity I have been looking into the Fleetguard 20000 filter which has a timed release lubricity additive. That couldn't hurt for sure. I think we could pull off biodiesel with that added as well but as I said, it is unlikely it will ever happen. Thanks for watching!

@daleolson3506 Месяц назад

The music junked another video 👎👎👎👎💩💩😬

@OnboardTangaroa Месяц назад

Sorry you feel that way. Thanks for watching!

@arczealdesigns9512 Месяц назад

If you need shafts replaced or manufactured, it's best to avoid Chinese-based companies. The quality of their steel is poor, and the shafts are likely to snap. It's not worth risking the safety of something important for the sake of cost savings.

@OnboardTangaroa Месяц назад

We have had one section of the shafts replaced already with Aquamet and likely will do 2 of the other sections with the same when we get to Alaska. While it was not in the budget on the current yard visit we are aware of the issue and will be arranging replacements for the next haulout. Thanks for watching!

@user-kr9nv4sh3s Месяц назад

Been around engines for over 50 years, a marine mechanic for 40. I just don’t understand why ANYONE would remove 2 14-liter engines and replace them with a couple 6.7liter engines. Ever heard of “no replacement for displacement”? I would at LEAST put in some QSL-9s. What are you trying to achieve? A couple clamp-ons (outboards) would have achieved at least a fuel saving! 😂

@OnboardTangaroa Месяц назад

I have also been a marine tech for many years in the past as well (not 50 though). I have also owned a performance automotive shop for the last 13 years and if I made a dollar every time I heard the term "no replacement for displacement" I would be rich. There is a replacement for displacement..... 80+ years of technological advancement. I have seen the capabilities of smaller displacement engines and have learned that you don't need double the displacement to make reliable power. The reason to remove the two 14 Liter engines and replace them with a couple of 6.7's is easy to understand. Same power, same torque, same or better time between overhauls, easier maintenance, quieter, cleaner, 25% or better reduction in fuel burn.... I could go on. The only thing I have lost is the ability to do in frame overhauls but this boat has easy access for removing engines so it doesn't really bother me. I have also learned that just because everyone else does it one way does not make it the only way or the best way for that matter. Sure, I could have spent a ton more money for an engine that would be harder and more expensive to find parts for for absolutely no gain. There is absolutely no need for a slow semi-displacement hull form to have massive engines. The power requirements are so small that even the tiny 6.7's barely break a sweat and have a huge amount of reserve power for emergencies. You don't have to take my word for it. Just do a quick google search for FPB 78. These are some of the most hardcore world cruising yachts ever produced. They are 25% heavier than us, 3ft wider and are a full displacement hull form. They are powered by.....you likely didn't guess it, twin 235HP Deere common rail electronic 6.8L engines. Thanks for watching!

@user-kr9nv4sh3s Месяц назад

@@OnboardTangaroa Don’t get me wrong, I LOVE the 6.7L, being a Cummins dealer and all, and I agree with the all the tech advances, cleaner burn, and all. But the 6.7 is a high rpm engine. A larger displacement (doesn’t have to be 14L), slower turning engine in a displacement or semi-displacement hull will last twice as long. Do you mind sharing the dimensions of your boat and the propeller size?

@OnboardTangaroa Месяц назад

The 6.7 is indeed a high rpm engine however it will not be used as such 99% of the time in our application. Our cruise RPM should be in the 1600-1800 RPM range. People have been getting an absurd amount of time out of the 6.7s run in this application. Hull speed is achieved at around 2400 RPM. We are 74ft LWL, 17ft beam, and 82,000 LBS at 3/4 fuel load. The hull form is slow semi-displacement. Props are 28" diameter with 32" pitch which has already been confirmed by the prop shop to be in the ballpark. Marine gears were swapped from 2:1 Twin Disc to 3:1 ZF as well. At 12 knots we require around 220 HP total (confirmed by fuel burn numbers on from the detroits) with a hull speed of 13kts. Our typical cruise speed is 9kts which requires around 85hp total by calculation ( fuel burn numbers on Detroits show closer to 120). I am leaning toward the Detroits just suffering from even worse efficiency at the 1000RPM we had to run them at to achieve 9 kts. Regardless, the engines fall within the prop curve of the QSB series. At the end of the day the sea trial will tell all.

@paulvlug-zu4tz Месяц назад

What hp are these Cummins going to be?

@OnboardTangaroa Месяц назад

They are really whatever hp I want them to be within reason as I will be the one setting up the engine management however They will likely be in the 250-300 hp range each which is over double what we need to meet hull speed.

@paulvlug-zu4tz Месяц назад

@@OnboardTangaroa I have a qsb 6.7 it’s a great engine 1700 hours in 3 years on a charter boat, hasn’t missed a beat, it’s the same engine from 280hp to 550 just a software load.

@OnboardTangaroa Месяц назад

Pretty funny how they work that isn't it. I have heard tons of good reviews on the 6.7's looking forward to giving them a go. Thanks for watching!

@wildcoyote34 Месяц назад

@@OnboardTangaroa i'll bet the cummins engines sound good too , they will for sure be quieter ,,,about 10 years ago i replaced the 6-71 detroit engines in my chris craft 44ft cabin cruiser with a pair of 8.3 cummins bus engines and the difference was staggering , i never changed the gear boxes though , the factory 2 speed units are what i used and if i had hindsight i should have gone to a 3-1 box like you did causei get overspeed warnings if i wind the engines up to near full throttle which is 3200 rpm ,i have yet to find my top speed cause wherei am in the central USA there are no lakes big enough ,,and right now i've got my boat out of the river due to flooding ,generally it's in the missouri river during the ice free months

@OnboardTangaroa Месяц назад

They should be pretty amazing. The reduction in noise will be much welcome. The Chris Craft sounds awesome. Great boats for those areas for sure. Thanks for watching!

@perryreasch1209 Месяц назад

WHAT WAS WRONG WITH THE DETROIT ENGINES ?

@OnboardTangaroa Месяц назад

Short of very poor maintenance and unknown hours there wasn't anything mechanically wrong with them that I know of other than leaking lots of oil. Other than one being considerably harder to start in the cold vs the other they ran just fine. They are just not well suited for the type of cruising we do in this boat. We ended up running them just off idle all the time and as all Detroit people know they don't really like that. You could run them up occasionally to burn everything out but I believe they are quite inefficient at the lower RPM ranges. There will likely be a 25-30% reduction in fuel burn with the new engines. Possibly more. The new engines are substantially quieter, easier to maintain, easier to get parts for, and quite literally tons lighter. They also can go 20,000 hours+ between overhauls if properly maintained. They are considerably more sensitive to poor maintenance and fuel contamination than the Detroits though.