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[clubbie]

Have done a search but did not find a definitive answer.
What is the max you can bore the stock CVO 110 4.00 cylinders?
Can they be taken to 4.060?
If you can go to 4.060 what thickness is left?

Thanks
Clubbie

[HILLSIDECYCLE.COM]

Then can be bored to accept a 113"(4.060")piston.
Scott

[clubbie]

Awesome thanks Scott.

[HD Street Performance]

Or 4.125 but I prefer the 4.060 cylinders (case bore needed on a CVO 110) when going that big

[harleycharlie1992]

Or 4.125 but I prefer the 4.060 cylinders (case bore needed on a CVO 110) when going that big

I'm confused as to what you are saying. I know the se 4.060 cylinders must have cases bored. but you are saying stock 110 cylinders can be bored to 4.060, which won't need the cases bored. Am I understanding this right? Have you done the stock bore (4.060 on 110 cyls) on motors? and the cylinders are still thick enough, without sleeves moving? (I'm not doubting you, I'm just making sure I have the info correct!) thanks in advance,
                                                   charlie

[HD Street Performance]

The cylinders and sleeves are the same for the HD 113 4.060 and the 110. The spigot machining and bore size is different.
I have used the 4.060 to go up to 117. The 4.060 had liners loose too notice they revised the number. Same ailment as the early 110s
I have not done any 110s and don't know if the spigot OD would still be left at a 4.125 bore.
Check the case bore dimensions in the HD instructions.
If .050+ is left on a side it should be fine but I am not recommending this for anyone to do without considering it an experiment. If it were mine I would just use the 4.060 cylinders and bore the cases then use base gaskets.

[HILLSIDECYCLE.COM]

The 110", 4.00" cylinder, can be bored to 4.060", and we've done this several times now. No issues whatsoever.
Last week were in dire need to procure a set of flattop pistons, for yet another CVO 110" that lost a lifter roller, and scattered it thru the engine, making a general mess.
H-D was out of stock with no ETA, Dealer network showed nothing, but Axtell had 4.030" J&E's on the shelf.
He is now going to Sturgis on a 111.6" engine.
If we could have found a set of 4.060" flatops, we would have sent him across the country with a 113".
Scott 

[clubbie]

Reason for the question is I have a set of 4.060 10.5 HD forgies for the MVA/110+ heads part # 22571-07B sitting in a box unused from a mates build that changed to 124 (due to crank issues). SO being winter over here I was thinking of pulling the heads and sending them out for a tickle and whilst that's happening send the cylinders out to get bored.

[djkak]

The spigot’s cross-section is roughly 0.090” on a 110’s 4.00” std bore.

[geezerglide]

Dewey & Scott,

What is an optimum cam for this build, using worked over stock SE 110 heads and the larger exhaust valves?

geezerglide

[HD Street Performance]

The spigot’s cross-section is roughly 0.090” on a 110’s 4.00” std bore.
Thanks!
As I suspected too thin to go .125 over without a case bore and 4.060 cylinders for 117"

Regarding a cam choice..
No way to answer honestly without getting into specifics of your goals, budget, payload, riding style etc. Also always have to keep in the back of your mind the cost of sidelining the motor and going to a 120r which is strong and reliable.
I am done suggesting cams on the net.
If somebody wants me to plan a build for them they need to be my customer.

[clubbie]

Thanks djkak and Dewey. So as I understand .090 spigot cross section means boring will remove .030 from the cross section of the spigot to get 4.060 bore.

Is .060 going to be enough meat left on the spigot so it doesn't distort into an egg/oval?

[djkak]

Thanks djkak and Dewey. So as I understand .090 spigot cross section means boring will remove .030 from the cross section of the spigot to get 4.060 bore.

Is .060 going to be enough meat left on the spigot so it doesn't distort into an egg/oval?

It seems that H-D doesn’t think .060” is adequate.

My sense is that results from a CAD lab were instrumental in the development of the 4.060” cylinder package. You would be reducing the cross-section of the spigot by approximately 1/3. I believe that you may be removing more than the calculated margin for error necessary to ensure acceptable long term performance of the cylinders. JMHO.

[HILLSIDECYCLE.COM]

Upon veiwing this info, at this point, all the OEM T/C cylinders bored to 98", and 107" out there, are going to pop!
Just because the same motor company that has slippped cranks, lousey lifters, guides coming loose, etc, etc, etc, does not do this, makes it wrong?
Me thinks not.
Scott

[HD Street Performance]

FEA is not always accurate IME.
In this case as Scott said we have had great success at 98 and 107" (mine is with CP pistons exclusively) and I did too with the 4.060 bored to 4.125. The spigot length and skirt support needs to be considered too which is one of the less discussed features of the HD bigger bore cylinders.
I have also sleeved the stock cylinders but that is nothing I offer to the public.