INSIDE LOOK / NEW 121ci VVT M8 Engine / TEAR DOWN

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VVT being the well known change to the new 121ci from Harley-Davidson, but what else is new?
Well a new 4-5/8" Stroke Flywheel, new piston, new cylinder heads, new intake manifold & throttlebody, new larger fuel injectors, new cylinders, new breather system, new lighter counter balancer, new shift drum design & more!!!!
I was down in Sydney for some updated training on the Revolution-Max engine for the Pan-America & Sportster S line up however I took full advantage of being able to fully tear down & inspect the new 121ci M8 engine while I was there.
I am really excited for what the future holds for this engine! Tuning will be an a great learning curve & I can't wait to get involved with that.
I was able to cc the combustion chamber which came in at 86cc. That is 2cc less than the original M8 engine at 88cc.
I was pushed for time & couldn't get to measuring the complete specs of the cam. All I focused on was the intake valve (rear cylinder) & total lift (rear cylinder).
The cam specs I was able to measure with no oil pressure in the cam phaser (unofficially) were ;
.519" Lift
Intake valve opens 7 BTDC
Intake valve closes 2 ABDC
It must be noted that when we were doing the degree wheel inspections, that the cam phaser had no oil pressure so I can not be sure exactly where 0 is on the phaser as some of the valve spring seat pressure may have been advancing or retarding the cam when I was taking the measurements.
Once the official specs are published by H-D I will post them.

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Опубликовано:

23 окт 2023

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Комментарии : 115

@stevenmederi4266 Месяц назад

Hey Dr Miller , nice to hear from you again , a bit like going back to med. school 😃😃😃

@chazzcapone. 8 месяцев назад

Amazing technology in the new CVO engine overall. Thanks for the insights 👍

@TheCuttz1984 8 месяцев назад

This is awesome. Head design looks great.

@CraigHarleyglideout 8 месяцев назад

Can't wait to see cam upgrades

@MasterTechMiller 8 месяцев назад

Me either

@GoGoggansGo 4 месяца назад

@@MasterTechMillerit’ll be fairly limited for cam upgrades unless they plan on locking out the VCT or limiting it them for movement. Either way when custom tuning comes out and you can take the time to work with it. The gains especially under the curve will be wild, it’s really shocking nobody has gotten on top of the rev max engines for tuning. I’ve yet to see any one take the platform seriously

@Fever_Rides 8 месяцев назад

Great overview, Thanks!!

@MasterTechMiller 8 месяцев назад

Thanks for watching

@302roadking 8 месяцев назад

Thanks mate been dying to know, need a video of what’s compatible to our m8’s!!

@ChrisJones-l 8 месяцев назад

Great info as usual, let’s hope they incorporate the vvt, heads etc into all M8s eventually. Given the cubes, compression, heads, intake size etc 150hp with flat torque curve shouldn’t be too difficult.

@six..... 8 месяцев назад

Just feel in the saddle the vvt is a rocket ship compared to non vvt m8s

@brandywell44 8 месяцев назад

I always remember and liked the Kawasaki VN2000 motor and the bike and I bought a service manual for them. One of the service items was checking for twist in the conrods which looked very slender for the size of engine. These Harley Davidson rods look similarly slender and just don't look strong enough and slipper pistons always amaze me that they don't twist in their bores. All the lightening work is likely matched with better metalurgy but things have to look right to me too.

@victorgonza4528 8 месяцев назад

Nice first video I see of the HD vvt system .

@MasterTechMiller 8 месяцев назад

Thanks for watching

@mickrose6450 8 месяцев назад

Love ya work🍻👍

@MasterTechMiller 8 месяцев назад

Thanks for watching

@hunter_mf 8 месяцев назад

Interesting thanks for sharing the video !

@MasterTechMiller 8 месяцев назад

Thanks for watching

@curtisg5117 8 месяцев назад

Great video, glad you took the time to post it up. Hope the paint does not come off the springs. I have 3000 miles no major issues so far. I changed the air filter and put khrome werks slip-ons with performance baffles in and se tuner she moves. If you find out how to change speed limiter that would be great! lol

@GMAN0444 3 месяца назад

That was my concern as well with the paint on those springs. Last thing anyone needs is a paint chip clogging up a oil port

@thexnewyorker7284 3 месяца назад

Nice vid . Just picked up a new CVO , its fast 😊

@MasterTechMiller 2 месяца назад

Nice! Enjoy it!

@Jack-kt8bs 5 месяцев назад

My 121 reminds me so much of my 1098 DUC

@2trdmustanggtfordf1hdsgsfa80 8 месяцев назад

Glad to see those pesky crankcase vents are removed from the head. Hopefully we can stop installing oil catch cans IOT stop the insane oil carbon buildup.

@roderernst9990 7 месяцев назад

Love the balancers ,want some! ha ha

@MasterTechMiller 7 месяцев назад

Pretty cool looking right

@MickOTooleroadglide 8 месяцев назад

Thanks for sharing Tommy that’s amazing insight on the new 121

@MasterTechMiller 8 месяцев назад

Thanks for watching

@falcon4075 8 месяцев назад

Would be interesting to see one with trask turbo!! Looks like it’s built for boost

@huibertdegraaf9622 8 месяцев назад

Finally they vent the head through the transmission cover instead if spitting it into the intake or out for that matter. Seen another video where the white paint was coming off the springs into the engine. Like who puts painted springs in a engine. ? Harley I guess

@kennethwise7108 8 месяцев назад

I learned that HD "King of the baggers" won't be running this VVT motor.

@MasterTechMiller 8 месяцев назад

There are a few things to consider why. 1. Lack of tuning for the VVT Engine 2. The large amount of tuning available for the Original M8 Platform. 3. Teams can use the largest displacement engine available from the OEM (135ci) 4. A tuned up 135ci engine will make more power than a non tuned 121 VVT engine.

@brendans5567 8 месяцев назад

Thanks for the insight into the new 121 . The VVT system is simpler than I thought it would be. You mention the Cam duration is variable , but I'm sure you know the system can only advance or retard the Cam, and not alter the duration, as that is ground into the Cam.

@MasterTechMiller 8 месяцев назад

Yes my apologies in my choice of words during the video. No scripts here, just point the camera & start talking. Occasionally, I will make a mistake & mix up my words. There is a lot going on in my head & when it's running in top gear & my mouth is only in 4th gear the delay can catch me out. Yes the timing variable, not the duration. The duration is a fixed spec of the cam profile. However to get technical, the phaser system works off cam torque acruationl & can senses the shift in the cam coming over the nose of the lobe on the closing of the valve & when its ramping up to open the valve. So of for example the timing was advanced at the opening of the valve them retarded duration the opening & for the closing of that valve then it would, ever so slight increase the duration.

@johnbeardsley7360 6 месяцев назад

hello, I just installed on my 2022 fatboy a 117ci stage 4 with 515 cam 64 mm throttle body and se high flow heads and the power comes on way to high for my taste. Before this I used a s&s 465 cam on a stage 2 and it came on about 2200 rpm and kept going to my next shift and is how I like it, however this cam doesn't work with the stage 4....can you recommend a cam for this build, thank you john...not looking for crazy hp but more than my stage 2 and ride ability is most important. I felt like if anyone knows its you.

@johngarland1641 8 месяцев назад

Interested to see how these heads flow compared to the older M8 and if they are backwards compatible to make a higher compressions better breathing M8 with the revised ports,chamber etc without the VVT.

@MasterTechMiller 8 месяцев назад

From initial observation it looks like they will bolt straight on. The engine temp sensor has been relocated to the front cylinder on the new M8 VVT Heads & so have the knock sensors. That shouldn't prove to be a difficult hurdle to over come so I'm hoping they will be able to be a direct fitment

@InfamousCreep 8 месяцев назад

👍👍👍👍

@ihateemael 8 месяцев назад

very interesting thx. I wonder if one of those new cam plates, cam and phasor would bolt straight into an existing m8?!! ps: why on earth those thick head gaskets? must be using existing barrels?

@MasterTechMiller 8 месяцев назад

The existing M8 doesn't have the ECM capabilities to run VVT unfortunately. I'd say due to the higher comp ratio & piston sitting proud calls for the very thick gasket? I'm yet to measure the cylinder height but I will get to it

@smitt1970 8 месяцев назад

I seen this video the other day, and I am interested more in the crankcase venting. So, I went to my local dealer, and checked one out. Surprise! yes it does vent from the trans top cover, but the way it looks, the vent hose from the cover goes up under the tank, couldn't see where it ended. to me, I am thinking that it goes to the intake manifold, couldn't see a catch can. would you be able to see if it is actually a catch can? I am sure that the EPA isn't going to let it go to a breather. so I would like to know more about it. Thanks

@MasterTechMiller 8 месяцев назад

Yeah so hose from the Trans cover runs up & over the rear cylinder head & is routed back into the air box. It simply vents into the air box & not directly into the intake like previous models. With the added oil separation system in the trans cover & not directly routing it into the intake will GREALTY reduce the oil mist going back into the intake

@2009bagger1 5 месяцев назад

Has harley released any cams or motor prts yet

@jcrean3 5 месяцев назад

Air cleaners and Stage I cals

@michaelmitchell5909 8 месяцев назад

Ya man, can't wait to see what you can do with this motor...shit I'm still riding a 95" t.c. turd....lol Hopefully one day I can afford a M8 114.

@MasterTechMiller 8 месяцев назад

Cheers mate. 🍻 You'll get yourself an M8 soon enough

@michaelmitchell5909 8 месяцев назад

@MasterTechMiller ...thanks for the positive response man....

@kennethwise7108 8 месяцев назад

@michaelmitchell5909 screw that nonsense Michael, don't waste your money on it. Have Greg Dahl make you a bad ass Twinkie. It'll smoke this thing and last WAY longer

@MasterTechMiller 8 месяцев назад

@kennethwise7108 keep commenting on my videos mate. It helps the algorithm boost my videos to more people's feeds.

@michaelmitchell5909 8 месяцев назад

@kennethwise7108 ...hi Ken. Ya I was thinking about that too, that's why I was asking tatro about the 100" kit or get a stroker crank and make it a 106", but that's gonna be alot of money either way....

@lordmomon3718 3 месяца назад

What size is the new intake manifold size? 58mm or 62mm?

@MasterTechMiller 3 месяца назад

58mm & the Screamin' Eagle option for the normal M8 is 64mm

@simeonhines9805 7 месяцев назад

Biggest question, current M8s, can we vent trans cover, the case vent side, and plug head breather?

@MasterTechMiller 7 месяцев назад

Yes! Absolutely. I have done that on a few bikes now. Keep in mind, when you vent the trans cover it relieves the head breathers so the chance of oil in the intake is reduced greatly so you can keep them in the head if you like or just put bolts in there to block it off.

@simeonhines9805 7 месяцев назад

@@MasterTechMiller thanks. Lots of inquiring minds want to know

@MasterTechMiller 7 месяцев назад

@@simeonhines9805 no problems

@simeonhines9805 4 месяца назад

Do you jabe a recommended size of hose for venting trans cover?@@MasterTechMiller

@MasterTechMiller 4 месяца назад

@@simeonhines9805 5/16"

@user-df7df1eb8z 2 месяца назад

My 2024 CVO 121 VVT makes a Ticking noise. Reminds me of a Valve Train noise. However I had Harley look at it and they said its normal. Could you explain this. Only seems to be prominent on Cold start and for the first 5-10 Mins after Start up. Once engine is hot. Noise goes away.

@MasterTechMiller 2 месяца назад

Yes it's normal. It's related to the VVT Cam phaser. Once oil temp comes up to operating temps the system is working alot smoother & the noises reduce. That's the short answer. I could go into more detail about the entire system, but just know it's normal & nothing to worry about. The Revolution Max engine found in the Pan America & Sportster S models is exactly the same if not louder on cold starts with the same noises

@user-df7df1eb8z 2 месяца назад

@@MasterTechMiller In that short time that its ticking. Its not doing any damage? Sounds to me like the Lifters are draining out the oil and takes time to fill back up.

@user-df7df1eb8z 2 месяца назад

@@MasterTechMiller I appreciate the Feedback and makes me feel better about it. I really enjoy my Legendary Orange CVO.

@MasterTechMiller 2 месяца назад

@@user-df7df1eb8z beautiful colour!

@MasterTechMiller 2 месяца назад

@user-df7df1eb8z No, nothing to be concerned about. Because the engine is idling & going through it's warm up cycles, when cold starts happen, the VVT system is in overdrive as it is making constant adjustments to the valve timing. Remember, the engine is at low running speeds, which gives off erratic MAP (manifold absolute pressure) readings, which is one of the readings the VVT system uses for adjustments. Then, as the idle speed slows even further as the warm-up cycle is completed, the VVT system is again making many adjustments to give the best efficiency & smooth running to the engine. At cruise speeds, the RPM, MAP & Throttle position is relatively constant & the VVT is quieter.

@FRWD_FXLRST 5 месяцев назад

Does this mean normal M8 came work or don’t work?

@MasterTechMiller 5 месяцев назад

Current M8 cams will NOT work in the VVT M8 Platform.

@richardrussell500 8 месяцев назад

Where are they sending the vented transmission vapors to?

@MasterTechMiller 8 месяцев назад

The intake manifold as per EPA requirement. The added oil separator, length of the vent hose & the fact it has to travel 'up hill' now greatly reduces the chance of oil mist re-entering the intake manifold that everyone cries about.

@richardrussell500 8 месяцев назад

@@MasterTechMiller I am glad to see HD finally ditching those head breathers for a much more effective way of venting the crankcase... many people will still use catch cans or vent to the atmosphere to keep the hot oxygen depleted air from entering the combustion chamber creating better engine performance. thanks : - )

@richardrussell500 8 месяцев назад

@MasterTechMiller 8 месяцев назад

@@richardrussell500 absolutely 💯

@richardrussell500 8 месяцев назад

I am looking forward to long-term reviews on this new engine... the M8 has had its own problems over the years. Sumping and overheating are the two biggest concerns.

@crunchytheclown9694 8 месяцев назад

Russian r and d with euro prices ?

@brandot.7466 5 месяцев назад

Thanks for all great info. can you tell me there is electric wires coming out of the transmission.... And on the non VVT 2024 road glide and street glide wires come out of the cam cover. THANKS

@MasterTechMiller 5 месяцев назад

Wires from the transmission is for the gear position sensor. The wires coming from the cam cover on both the VVT & Non VVT Engines is the cam position sensor.

@kennethwise7108 8 месяцев назад

Damn, hardly any skirts on the pistons

@MasterTechMiller 8 месяцев назад

How should they have designed them & why?

@kennethwise7108 8 месяцев назад

@MasterTechMiller I have an idea that I need to get patented which completely does away with any runout of the flywheel halves and makes them perfect. No scissoring and indestructible. Aside from that weakness the motor looks like a great improvement. I spoke with the Screamin' Eagle guys at HD and they have no interest in running this motor in their King of the Baggers Season

@MasterTechMiller 8 месяцев назад

@kennethwise7108 yeah ok mate. You didn't answer my question in relation to your statement about 'hardly any skirts on the pistons'. How should have Harley designed there pistons & why?

@kennethwise7108 8 месяцев назад

@MasterTechMiller The obvious is that with shorter skirted pistons there is significantly less support. Thus, it will wear out the piston and cylinder walls quicker due to the increased wobbling effect. I didn't mention ANYTHING about fixing or remedying this problem. I merely made a statement about how "short the skirts were". As an engine builder, I wouldn't even want one! More power to those people who don't consider things of this nature prior to purchasing the bike. Many probably don't even care about the longevity of a motor. This motor won't last 100,000 miles (160,930 kilometers). IMPOSSIBLE!!

@MasterTechMiller 8 месяцев назад

@kennethwise7108 you better pass this information onto the Engineers at Harley-Davidson. I'm sure they've obviously not considered any of the points you've just mentioned.

@Rider_on_Indian 8 месяцев назад

Still they didn't solved the carbon build-up problem. I saw a video from an onwer removing the valve cover & looking the pistons heads.. Lots of carbon at early low mileage CVO 2023 engine..

@danr919 8 месяцев назад

Change oil and service regularly as bike needs care like anything. Do that an carbon will never be a problem and many kms you will get out of it.Carbon will be the least of your worries.

@danr919 8 месяцев назад

Thanks again for the insight and probably the only detailed look into the engine not many of us will probably own and pull apart. Great work mate 👍

@Rider_on_Indian 8 месяцев назад

it has nothing to do with oil changes. . .its running lean from the factory...needs tuning and research to fix that issue

@danr919 8 месяцев назад

@@Rider_on_Indian it has to run Lean from factory to meet EPA Harley can’t change that. It has to do with re circulating blow by into the intake which engines have done for many years. Bottom line service and look after the bike in stock form and carbon build up wont be a Issue to the motorcycle producing many years and Kilometres. So Carbon build up isn’t a problem. It’s only a problem because you read to much on internet with company’s pushing products to sell to gullible people. I currently have a twin cam 96ci with 150,000kms dead stock never rebuilt and a 103 with 44,000kms with cams pipes tune and it’s caused more dramas then in stock form

@MasterTechMiller 8 месяцев назад

@Toyota_MK4_ The biggest issue is folks riding these air cooled V-Twins around like a sissy. Not getting the combustion temps & pressures up high enough to burn off the carbon deposits. They tend to 'lug' them around in too tall of a gear at too low rpm ranges resulting in excessive carbon deposits & build up. Sure, factors such as fuel quality/octane rating, environment & service discipline all can contribute to this aswell. The fact that Harley-Davidson & every other mass production motorcycle or car manufacturer has to route the crank case vent back into the intake manifold is a EPA requirement. It's widely known that Harley's have oily intake manifolds because lots of guys out there take their air filter off to service their bikes at home & see it for themselves. Can you imagine if you took ANY internal combustion engine gasoline powered motorcycle on the market today and took the crank case vent hose, ran an external hose out of the intake manifold & pointed it towards yourself while wearing a white shirt. Then go for a 100km ride & tell me how clean your shirt is.