2023.5 CVO RG 121 VVT cammed and tuned
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,113
Likes: 11,159
From: San Diego, CA
The VVT will be a good thing for power mods....
Whether or not the Harley VVT is a good thing, based on their new tech track record, is too early to tell...
But in true HD fashion, I will predict that 5-8 years from now, it will be all dialed in...
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Road Master
Joined: Dec 2010
Posts: 1,010
Likes: 101
From: Parrish, Florida
I couldn't wait 8 years so I took care it myself with help from my friends. ;-)
HDF Community Team
Joined: Jan 2020
Posts: 1,434
Likes: 800
From: Colorado
VVT, on a engine that is designed to redline at 5200, does seem counter productive.
yes, may pick up a little HP through the limited range, but VVT is more designed to be the best of bolt worlds on a motor that revs much higher instead.
As for how lean HD has the motor tuned to start with, easy to pick up power by just adding fuel, and which the increase in fuel will allow you to add more spark as well.
Also, noticed that you are rev'g the motor much higher than standard 5200 Redline, so what mods done to allow the motor/crank to hold up to that increased redline, not have the crank starting to have a great deal of run out over time as the flywheel begins to twist?
Or are we just playing Funny car motor increase, where the motor only has to last at least half way down the 1K strip run instead?
yes, may pick up a little HP through the limited range, but VVT is more designed to be the best of bolt worlds on a motor that revs much higher instead.
As for how lean HD has the motor tuned to start with, easy to pick up power by just adding fuel, and which the increase in fuel will allow you to add more spark as well.
Also, noticed that you are rev'g the motor much higher than standard 5200 Redline, so what mods done to allow the motor/crank to hold up to that increased redline, not have the crank starting to have a great deal of run out over time as the flywheel begins to twist?
Or are we just playing Funny car motor increase, where the motor only has to last at least half way down the 1K strip run instead?
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Road Master
Joined: Dec 2010
Posts: 1,010
Likes: 101
From: Parrish, Florida
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Thread Starter
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Road Master
Joined: Dec 2010
Posts: 1,010
Likes: 101
From: Parrish, Florida
VVT, on a engine that is designed to redline at 5200, does seem counter productive.
yes, may pick up a little HP through the limited range, but VVT is more designed to be the best of bolt worlds on a motor that revs much higher instead.
As for how lean HD has the motor tuned to start with, easy to pick up power by just adding fuel, and which the increase in fuel will allow you to add more spark as well.
Also, noticed that you are rev'g the motor much higher than standard 5200 Redline, so what mods done to allow the motor/crank to hold up to that increased redline, not have the crank starting to have a great deal of run out over time as the flywheel begins to twist?
Or are we just playing Funny car motor increase, where the motor only has to last at least half way down the 1K strip run instead?
yes, may pick up a little HP through the limited range, but VVT is more designed to be the best of bolt worlds on a motor that revs much higher instead.
As for how lean HD has the motor tuned to start with, easy to pick up power by just adding fuel, and which the increase in fuel will allow you to add more spark as well.
Also, noticed that you are rev'g the motor much higher than standard 5200 Redline, so what mods done to allow the motor/crank to hold up to that increased redline, not have the crank starting to have a great deal of run out over time as the flywheel begins to twist?
Or are we just playing Funny car motor increase, where the motor only has to last at least half way down the 1K strip run instead?
Last edited by Bgill; Feb 21, 2025 at 08:44 AM.
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HD EFI Guru
Joined: Jan 2008
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Likes: 4,718
Great questions: I think the reliability factor increased as we upgraded the lifters, bearings and added billet lifter cuffs and got rid of the plastic ones that come in it from the factory.....plastic parts in a motor from the factory....yikes. There was no need to delete the VVT and all it its virtues now that Cycle Rama has a cam out for these bikes, And as the dyno sheet shows the power is instant, everywhere and very linear. I'm very happy with the end results as they we exactly what I was looking for to align with my riding style.
Edit: I noticed you say that the cam bearing was replaced, guess what the factory 121 already comes stock with the improved cam bearing, so all you got was the exact same thing that was taken out.
Last edited by Steve Cole; Feb 21, 2025 at 12:48 PM.
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Road Master
Joined: Dec 2010
Posts: 1,010
Likes: 101
From: Parrish, Florida
You have been lead to believe there is something wrong with the factory lifter cuffs and your wrong, and got sold a bill of BS. The factory plastic lifter cuffs are perfectly fine, and by the way, GM, Ford and several other OEM's have been using them for years and years with millions and millions of miles making much more torque and HP than a little old HD engine ever will! As far as increasing the reliability you've done nothing to improve it any by adding a cam, lifters, Aftermarket ECM and Aftermarket lifter cuffs. If you abuse the new power you are going to reduce it, but it you treat it right and take care of it, it should remain very close to the same as stock. Glad your happy with the improvements and hope you enjoy the new found power.
Edit: I noticed you say that the cam bearing was replaced, guess what the factory 121 already comes stock with the improved cam bearing, so all you got was the exact same thing that was taken out.
Edit: I noticed you say that the cam bearing was replaced, guess what the factory 121 already comes stock with the improved cam bearing, so all you got was the exact same thing that was taken out.
***I'm happy with my package and the end results and that's all that matters right?***
I posted my results for others considering going down the same or a similar path as I couldn't find a lot of data out there at this point.
The CR562 VVT cam was recently introduced in the last week or so so folks can now see how it turned out via my application as they weigh their options.