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[Fraca]

Man I'm pulling my hair out over this one, I've just brought a 2015 CVO 110 Street Glide and am considering a cam change. I know there's plenty of really good after market cams out there but given I have 5 years warranty to wait out I have to stick to what is on offer by Harley.

From all the hype over these motors the writers indicate that they have a higher lift cam over the old one, which I presume was the SE-255 in the air cooled model. If this is true then what is the cam in these new motors because the power curve looks similar to the previous air cooled model. I know the compression has been bumped up a bit which would account for the increase in torque in the twin cooled over the previous motor design. So has HD done a whole new cam profile for the engines or not?

I looked at a SE-585 but it is listed as not fitting the twin cooled engine?

Has anyone else come across this and what was your solution or am I the only one having drama?

All info appreciated as I can't get a straight answer from anywhere.

[grc]

The cams in the 2015 CVO110 are still the old 255, and the compression ratio is still the same 9.2:1 that it's been since the 110 came out.  The blurb from Harley about increased compression and different cams pertained to the Twin Cooled standard engines, not the CVO.

Jerry

[GMR-PERFORMANCE]

Jerry nailed it

Nothing new under the sun there..  as for the HD cams the 255 is the best fit for the comp ratio you have. Tune it and forget it.  A slight increase with a twin cooled .027 MLS gasket would help a small bit. But a fair amount of work for little rewards.

[Fraca]

Thanks Fella's, sure is appreciated. 

I would have to agree if the compression hasn't been bumped up then I wouldn't probably consider a cam change as I don't want to unseal a new motor and replace pistons even if my dealer indicated my warranty wouldn't be effected, kinda defeats the purpose of buying a new bike in the first place.

So am I correct in presuming then that there is not much between the "new" 103 and the "old" 110 as far as torque and power is involved if I were to jump from one bike onto another and ride them both. I am sure the actual dyno stats on paper probably indicate a difference but would it be noticeable on road I wonder?

Sounds like I'll just being doing an exhaust system and tune then calling it quits until warranty is over and done with and I have enough miles on it to warrant a freshen up unless there are some other less intrusive tweeks that will make my engine exhaust package more efficient....

Thanks again Fraca

 

[Ridgerunr]

I'm surprised they say the SE .585 won't work in a WH110, valve springs not up to the task?

[grc]

I'm surprised they say the SE .585 won't work in a WH110, valve springs not up to the task?

They don't have a lot of faith in their tolerances, just like most of us.  Back in 2008 they changed the valve guides after all the early failures, and one result was a reduction in the amount of available travel of the valves.  Check out the attached tech tip describing the affect on allowable valve lift.  I'm guessing that may have something to do with them saying the .585 lift cam isn't a bolt-in for the 110 with stock heads.  Or it could be just another mistake in their catalog, since that is quite common as well.

Jerry

[GMR-PERFORMANCE]

Man Jerry is getting it done.

 I have seen where the 585 cam has hit the valve seal... .. Reason we did the cam at a 577 lift and 555..  Guys do it all the time and even shops will say the S&S 585 is a bolt in..  Makes one take pause .. I would suggest that you choose a cam with less lift will keep things in the clear that way.. Good luck

[HD Street Performance]

Ok I measured a new program head
.690 seal clearance and the springs go to coil bind at 1.105 with a 1.815 spring pack distance on the seat. So coil bind is not the limiter at .710. The seal distance - .060 which is customary yields .630 as a real world limit, ymmv.

[grc]

Ok I measured a new program head
.690 seal clearance and the springs go to coil bind at 1.105 with a 1.815 spring pack distance on the seat. So coil bind is not the limiter at .710. The seal distance - .060 which is customary yields .630 as a real world limit, ymmv.

Those numbers sound like what was common on the CVO103 heads as well as the early 110; real world limit over .600" plus a safety factor.  Unfortunately some late model 110's don't appear to have the same numbers, based on complaints such as those mentioned by Steve with cams having valve lifts of less than .600".  I think it would be wise for anyone contemplating cams with valve lifts over .580" to at least check their clearances before just slapping in the cams, firing it up, and riding off into the sunset.  I trust Harley's tolerances about as much as I trust the typical politician, if you know what I mean.  Plus or minus whatever they can get away with seems to be the new normal.

JMHO - Jerry

[HD Street Performance]

Jerry
I couldn't agree more. The MOCO TSBs and other P&A documents are relevant but when real world trumps that it becomes necessary to check everything. I talked to Steve the other day about out of spec guides. Comes a point when you can't trust much.
I have many sets of these heads and also late model take-offs. I threw the Trock on 3 sets total without tearing them apart and 1 more measuring. All went to .680 to .700 before bind.

[grc]

Jerry
I couldn't agree more. The MOCO TSBs and other P&A documents are relevant but when real world trumps that it becomes necessary to check everything. I talked to Steve the other day about out of spec guides. Comes a point when you can't trust much.
I have many sets of these heads and also late model take-offs. I threw the Trock on 3 sets total without tearing them apart and 1 more measuring. All went to .680 to .700 before bind.

    Good to know.  Perhaps Harley has finally improved their process controls?   

Jerry

[Ridgerunr]

To the OP, this shows the cams fitting CVO touring models. http://www.harley-davidson.com/store/twin-cam-performance-cams---se-585

I agree with others here double checking.

[HILLSIDECYCLE.COM]

............and those S/E spring upper collars have left contact marks in the rocker covers as well.
Scott