Turbo Predator 670cc Dragster BLOWS UP after 8,500 RPM Pass 

thats about the most impressive way of breaking a torque converter ive ever seen, get yourself a polaris cvt driver those can handle a whole lot more power

The fact that the engine survived 8,000+ RPM is insane. We definitely need a dedicated CVT guard next time around!

I love the Harley transmission idea. Having a sequential stick shift(or pedal shifters on the steering wheel like on your offroad projects) would be really cool on this project.

Good thing he stayed right in the middle of the track to ensure maximum oil coverage.

With all the fuel that came pouring out, you can see the need for a fire proof hood, worn under the helmet, that covers your neck. So glad the fuel did not ignite. I have seen the results of fire on a slingshot style drag rail at 2 of my drag strips and the end result was horrifying and sad. You have a nice set of race trim leathers, but really need a little more protection. Your fans want you to remain healthy and safe. Just finished watching and found out the liquid was oil, not fuel. You're extremely fortunate Ike. I was wondering why, what I thought was fuel, did not ignite.

With all those flying parts that’s a good indication you might need a scatter shield. Safety safety.

I saw my name on the Dragster! I didn't realize I'd be this excited about it. I haven't felt this happy in a long time. Barely keeping a roof over my family's head, but seeing my name really felt awesome. Thanks guys

Hey guys, crazy Canuck here. I’ve ridden high performance mountain sleds that have produced up to 320 hp, that particular sled ran a Polaris four post primary clutch on the engine and could withstand the 9500 rpm the engine turned at. Talk to sledders, they can help you determine the correct weight and spring combination to obtain optimum shift rpm while maintaining maximum grip on the belt. Plus as an added bonus you have limited adjustment of your stall speed which should help your hole shot tremendously. Also keep in mind snowmobile belts can handle huge horsepower and not fail. On a safety note! Put a belt guard on that thing! I once got hit by a piece of belt frac after it bounced around engine compartment than came out through the hood and hit me in the shoulder, it left a bruise and sore shoulder for about three weeks! You fella’s are entering fatale speed territory, take some precautions please! I just found this Chanel and I want to see lots more of your ingenuity and insanity! I love it! A machine built from scratch using components never before mated and than tuning it til it goes killer fast…. What more is there!?!? Oh! Wait! (HEADSLAP) That’s right! Make it go faster!! Thanks for the great content from a new subscriber, stay safe, motor on! Regards Mel from Quesnel

Use a snowmobile CVT. Right off a sled. Many are good for 150hp. Plus much aftermarket support with weights and spring's to keep the engine in the perfect RPM. I would love to see you guys try a XCR Polaris 800 engine and clutches. That would pull 100mph in the 1/8th

I respect the fact they show and explain the failures. Back yard ingenuity at it's best. Thank you, gentlemen.

It was a great honor meeting you guys at a RC shop. I am the Autistic guy that loves people. Thank you so much for making the trip to see everyone from Anderson RC. God bless you guys. From Mark Hunter!

Dude I’m so happy I made it on the firewall! That means so much to me, love the t shirt too! You guys are awesome and I hope you guys keep motivated with the drag rail it’s my favorite project so far! Have you thought about drilling out the emulsion tube in the carb? That could be limiting you on the fueling side, I think the reason the 38mm didn’t work was the engine wasn’t pulling enough air to create a strong enough signal to pull fuel through it.

You may have to buy like a Comet 102c or 108c setup. They are upgraded CVT clutches for older 2 stroke snowmobiles. They hold up to 100hp or so.

Time to go EFI with launch control and a hard RPM limiter. (Check out speeduino!)

A 4 or 5 speed Harley trans would give you obvious gear abilities while being compact. Clutch gives all the extra control you want and of course a huge aftermarket.

I'm happy that no one hurt when the cvt let go, I got idea for build for you and all the RU-vidrs you know and some don't yet know I saw a show of lawn tractor pulls and thought it would be great to see all of the RU-vidrs challenge each other to build one and see how far you could pull the sled.

Hey Ike, when you blow up at the drag strip you’re supposed to pull over to the side so oil doesn’t get strewn all the way down the track but glad you’re alright , no need to be embarrassed guys, blowing up at the track is part of it, I really wish it would’ve stayed together though cause that sucker really took off at the line til it ran out of gear an went caplooy , patch her back up an make a triumphant return for redemption lol 🤙🏼

I was thrilled to have the chance to witness this first hand! Hate that it broke but glad everyone was ok! I’m happy to meet y’all as well! Hope to see y’all at the track again soon!

You guys are awesome! You have experienced what all those who push the limits experience, the limit. Now you know your equipment's present weakness and have a place to focus on. Keep on pushing!

You guys are so humble. I love that. But I believe everyone understand the situation. I’m glad the driver is 👍.

"It'll be fine" is a nice, chill attitude to have in general, and great for youtube content when things goes sideways. But sometimes it just isnt good enough. Especially when playing with more power, nitro/methanol fuel, and parts that are, in all honesty, likely to blow up. Disregarding oil and pieces on the track, tech inspections and safety regs were often written in blood. Flying parts and potential alcohol invisible fires are no laughing matter. Please take this just a bit more seriously, we want to keep having you around. /old racer.

You forgot the Golden Rule always pull over to the railing's as soon as you have a problem it makes sure as little as possible fluids are dropped on the main track, clean up can be quicker.

I just remembered why I like your rail goKart so much. Reminds me of the Zingers Cars of the 70's 👍🇺🇲🇺🇲

Wow glad Ike is not injured. That waz close.All the best to you all.

Definitely needs a transmission. Would love to see y'all banging gears down the track.

No damage on the firewall yet it's scratched to high hell 😂 My vote is to go for snowmobile CVT next, it's will definitely hold up to the RPM y'all are looking for to run through it, you'll get a better gear ratio and there's a huge aftermarket. 👍👍 No third Jack shaft 🤦

You guys are getting crazier and crazier, keep having fun!

CVT is definitely the best for that setup I’d say,the ability to hold constant power output vs using a shifter transmission,plus shifting gears would add time down the track,if it were me I’d try and CVT setup off a higher CC atv,you’d have the ability to upgrade if needed ,love the channel and creativeness that goes into the projects

I'm surprised you've stuck around with this particular CVT for so long seeing how it wasn't fit for purpose at all

CVTech makes a great cvt that’s typically used in snowmobiles. I’m part of an SAE baja team and we also use a custom CVT made my gaged engineering however I’m not sure what their max power and rpm specs are. CVTechs have like a 3:1 starting ratio and finish at like a .47:1 and gaged starts at 3.9:1 and finishes at .9:1. Hope this helps.

BUMMER ! GLAD HE DIDN'T GET HURT ! I like the Harley Transmission idea. Or something like that . That is One Tough Engine y'all have Built !

This is awesome. I was looking up 670cc rotax engines. lol I run those engines in my 1985 honda odyssey. You guys are doing awesome work.

just a little advice for the next time something happens at the track. As soon as you can get pulled over as close to the wall as possible to avoid dumping oil in the Grove or right in the middle of the track. people will hate you less

That's such a bummer man. I love this project and I enjoy this channel so much. Keep at it guys and I can't wait to see this drag rail full send it soon

A complete rebuild would be very cool, and adding com’s while at the drag sounds like a good idea too just to check in on the driver

So happy to see you guys running this master piece! Maybe adding an under pan will keep oil and parts safe. Also, drilling a bigger orifice on the return oil passage on the turbo will help oil get faster into the oil pan!

It was loads of fun meeting you guys at the dragstrip! Keep up the great builds!!

I have been following this channel for several years and I'm generally a fan of what y'all do, but there are several mistakes being made with this build and the result is inevitable. Firewall, transmission, turbo, nitro, the transverse layout, the socks over the air filters... I would love to see this project succeed but you _need_ to rethink your strategy otherwise this could end very, very badly for someone.

Didn't have a tach on there. Yeah, and apparently a rev limiter either. Outstanding video! And I'm glad no one got injured.

It was great being there. Unfortunate that it broke after just half a pass but thankfully it wasn't worse. Tracks can be cleaned up! While in staging and waiting for the track to go green again I didn't hear anyone complaining about the situation. Everyone was just chilling around their cars and checking each others out.

I just recently subbed. You've got to be safer, as I'm sure you've learned. That dent in the exhaust is terrifying. Glad Ike dodged that bullet.

There's a reason rear-engine dragsters came to be. Glad Isaac is A-OK.

You guys are awesome 👌. I always look forward to seeing new videos from y'all

I Love the Sound! Like a big dragster...

Ike, when you have issues like this you need to get out of the groove as quick as you can and to the side to keep from oiling down the whole track. You also need to buy an alcohol carb for it.

You guys also need one of those switches (maybe one that you have to press while holding the steering wheel?) that you can easily get to that kills all ignition because that was running for a while with all that fuel going everywhere.

Bad luck, you'll get it right, all the best to yous and your loved ones

That is why the newer dragsters have the driver in front of the engine, with a shield separating the engine and driver. That could have been really really bad, glad the driver is ok.

Love all your innovation, starting to go fast enough to start thinking about a better roll cage!

“We’re gonna show exactly what happened” Bruh in the last episode, you said the torque converter was for like 16 or 18 hp. We all expected this.

Gotta love the arm chair quarterbacks in the comments right? You guys are smart enough to come up with something that will work. As long as you are driven by your desire to have fun your channel will still be cool. Thanks for the slow mo explosion bit, super cool!

Whatever you do add a scatter shield around the setup. Glad to see no one got hurt.

Somebody get these boys a clutch assembly out of like a ZR-600, STAT!

Love the channel and content, but must say I think after "no surprise" "we knew we were Greatly exceeding its limits" and similar comments it was a bad idea to run on a public track for everyone else's sake. Glad no one was injured; best of luck on repairs and future runs, can't wait to watch!

Y'all shouldn't feel bad! Test and tune! You're learning! Have fun!!

It sounded like it was on the max rpm. Good luck guys love the videos.

Time for drag rail 2.0 hang that one back up on the ceiling and start frame up incorporating everything you learned from the first one to make it even better

Get a Baker Transmission and you can bang gears just like a harley. Eliminate the weak clutch’s

I never go to the track without the cooler packed with Gatorade/water just in case something like this happens so I'll have a nice cold peace offering! I've been lucky enough to not have to use it yet but I've been handed a couple Gatorades/waters and it always hits the spot. Awesome video man and don't sweat oiling down the lane because it happens and everyone is more concerned with you leaving in the same shape you arrived!👍👍👍

Just got my Vote for turbo shirt and yall signed a piece of the belt for me. Thats very nice guys.

The 670 has survived the wreck on the mower which needs a revisit it survived the magnets in the flywheel seizing the engine and now a grenaded cvt pulley and 8,000 rpm like a cat it has 9 lives

I cried reading the title and my heart dropped into my chest. Thank you guys for the content!

Just got my shirt... love it .. thanks for the extras too...you guys are extra awesome now!!!😁

Did a snowmobile clutch years ago from a 70’s Kawasaki that needed a taper shaft mount. Never touched the straight shaft out of the engine. Made the taper sleeve piece that did not have a key way for the fit piece. Kept taking small shavings off the turned shaft to find the right taper angle. Had a longer undersized though bolt inside the taper as an extra long sleeve mounted in the lathe chuck. I could undo the nut check the taper fitment with lapping compound. Once satisfied with shaft taper then re-chucked to do shaft bore with a thou to a couple thou undersized press fit. Did lots of measuring to figure out the cut off length for clutch and engine wall clearance good fit. Heated the taper sleeve, placed on shaft and left a blunt nose on taper mate end for another sleeve to hammer tap taper to engine shaft. Used many different lengths of bolts when finished mounting clutch to new tapered engine shaft. Also left a step collar on engine side for a pickle fork or 3 jaw puller in case I had to pull it off the shaft if I had to replace the engine. And yes it’s like 3 engines later on this flint stone backup high seat open floor full suspension kart. The Kawasaki clutch needed to be tweaked every time the engine changed for spring tension and dawg weights changed for engaging rpm speed, to also not over weight the cvt to find the engines power band of an even acceleration power curve. And not do the fling to high rpm and full clutch engagement and radical tire burn. I wanted the pleasure ride of a full suspension go karting off road crawler if need be driving machine. Just add or remove material till you find you sweet spot. Yeup I bought a couple of belts for the figuring of the right sized parts for my ride. I even had to re drill the low end spring engagement side cause snow machine were like plus 3000 rpm and I was running stock Briggs at first. And then I figured out the dawgs issues... blank slate learning. Oh read up on old sled torque/hp specs and took a guess on the engagement side as I knew most clutch designs as the kid mechanic that I was.. I simply made it work. That frase going back to the drawing board was really a good part of the journey. Lathe and milling machine often are required parts for this type of play... enjoy the go

I’m curious as to why was that converter still on the rail? It has at minimal double the power going threw it. That’s just asking for a catastrophe. Luckily that’s all that happened and nobody got hurt. We all want to see this thing done up right. Air/fuel problem and a proper cvt. Not an “it’ll be fine” cvt cuz it won’t. 🤦‍♂️

One thing you guys don't have to remove your primary clutch to put a new belt on. You just have to put belt on primary clutch and then push in your secondary clutch and slide the on. If you race snowmobiles you change the belt every race so you have a cold new belt for best performance 👌

I love it when John breaks out that Carolina twang!

That thing is bad ass guys can't wait to see up grades and it make an impressive run down the track

I think a Harley transmission is the way to go. They'll hold up to the hp and torque and when the engine nears its redline, just shift it. Also I'd recommend a tachometer.

Sorry about the dragster and I'm most glad that nobody got hurt I love your drag kart it's awesome

Man that sucks to have a failure like that, I just took my home made turbo 125cc dirtbike out last weekend, makes me glad I have a clutch and and transmission and a torque converter. Also super cool to see my name on the firewall!

Grinding on the clutches.....great idea

Can't say I couldn't see this happening lol. Next time try to side track the rail to minimize oiling the track

love the videos, I hope you keep going to get the next generation into engines🙏👏

Great video guys, can't believe the torque converter blew up like that!! Next project idea- vertical engine go kart or trike, use a rear end of lawn mower

It makes sweet music love the v twin sound

Might be time to consider a scatter shield for the torque converter as well 😁

It’s time you put a Streetbike/Harley/snow mobile engine in it and turbo that!

Nice work guys .. that's a sweet setup. Now, a little friendly advice .. rule 1. If you still have vision and control, GET TO THE WALL .. so you're only oiling down the side and not the groove.. It's good to see that it wasn't any worse than that. I hope you lay down some impressive times with it, good luck. That is all, carry on LOL

Excellent camera footage, glad no was was hurt

Another great video. It was sad but so much was learned. Mr C has a heart full of concern for Ike. I too was worried he would catch some metal.

Man, it almost wasn't fine, might be time for a steel cvt cover/ guard and a perforated fire wall doesn't stop fire, if that fuel or oil had ignited Ike would not have been safe

Ike is so lucky it wasn't anywhere near as bad as it could've been. Can't wait to see the rail back on a strip.

This could have been so much worse guys , I’m glad you’re safe though but please don’t skip safety 😕🙏🏽 Take care 😉✊🏽

In FSAE the torque converter is required to be covered with a steel shield for this very reason. Would recommend TC scatter shields in the future. Also have a look at Microsquirt EFI. It would be so much better for controlling this setup. Would suggest using Gates Barricade fuel hose, a Walbro GSL393 fuel pump, and an aeromotive regulator with 4an fittings. Use LS ignition coils for spark, 550cc denso injectors for fuel. Use a crank trigger mounted between the drive pulley and the block and run wasted spark. From there you need a 30-40mm throttle body mounted after the turbo with TPS, a 3 bar map sensor, and an intake air temp sensor. A proper plenum will improve cylinder to cylinder distribution of air. For a 670cc engine a plenum with a volume of 1 gallon should be about right. Executed right that list of parts should get you to 100hp or more. Many FSAE teams achieve 70-90hp with similar parts on motorcycle engines breathing through an 18mm restrictor.

We all knew I was risky with that tourq converter, you guys weren't sure it would hold up to the dyno session... glad nothing really major broke and Ike wasn't injured 🙃 I think gears might be the only way forward depending how much you want to push the motor...

I end up with a lot of assorted spare parts in my world, channels like this one give me ideas of how to use them 🙂

You guys so need to get a transmission, that would be wicked seeing that thing banging gear down the strip. Other than that I love your guys content

Geez that thing was spraying nitro methanol everywhere I was almost certain it was going to ignite…. Guys that was WAY closer to a disaster than I think you’re willing to admit So glad no one was hurt!

When going from gas to methanol or nitro you must increase the size of the orifice tube directly under the jet as well as the jet to run right. The other fuels like a little more timing too. You may already have this information, just checking. I like your videos, keep them coming.

The Bobcat Goldthwait "I'm sorry I'm so sorry" was priceless ..too funny

The transmission would be amazing!!!

Dude...you're supposed to pull to the side of the strip so you keep the majority of the liquids off the center of the track. The second it blew you should have done that.

You're CVT was wobbling at 4:46. It was damaged before sending it down the track.

I’m just happy no one got hurt in that show that was bad ass and that’s how you do it…. I’m glade you have the people doing that damnit the way you all do shit is so bad ass keep it up … I’m getting a new cvt today… I hope we learn from this and move on with bigger and better parts you guys are the baddest there is I’m glade you didn’t blow the engine WOW nice job and Ike don’t be sorry shit happens you did a great job keeping that Monster on the track…. It could happen to anyone of you…. I can’t now but willing to help…. WOW nice… now rebuild and go again…. Love ya all and be careful… it could have fired up on ya…. I’m very impressed let’s do it again boys…..

Sounded lean as well, should definitely do a tuning session under a load after switching to nitro and methanol mix, also like they said, use a fire suit rated for what you are doing, no one wants to see you guys fried crispy, sick build, hope you guys meet your time goals safely in the near future!

Drag racing etiquette, always pull to the side of the track when you blow up!!

The main thing that would concern me about the methanol/nitro blend is how it's nearly invisible when you are on fire...I was tuning my minibike, and couldn't figure out why I was so hot, until I saw flames going down the gutter from the flow of fuel pouring into the street!

You know what? It's okay guy's that's why they call it testing!!! It happends that thing was ripped in power, only time to rebuild even better 😆 loved the camera's glade that ur good brotha and nice test wonder what the time was

You guys have nothing to apolagize for its all part of the game i was just glad to hear the engine still running after lol great project deff sled clutch setup can handle double what your making for power so u will have some wiggle room lol good luck