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[panheadsteve49]

About to start a modified CVO 110 build on a 04 RK. I am using stock HD (Mahle) pistons and stock HD cylinders that were supplied in the 110 upgrade kit. Mahle's website recommends .001" piston to wall clearance measured at 10mm from bottom of skirt. I had an independent tech to torqueplate and check this clearance for me and they are as follows: Both pistons measured exactly the same. However one cyl measured for .001-.0014 clearance and the other cyl measured for .001 -.0018 clearance. Difference was in taper, not out of round. My tech said he would run them, putting the cyl with more clearance on the rear as it tends to to run hotter.That makes sense to me. Is this additional piston clearance and cyl taper enough to cause piston noise, pre-mature wear, oil consumption etc? (preferrably looking for input from techs who have actually checked these factory CVO 110 clearances prior to install as well as opinions which is all my tech can provide me)

[HILLSIDECYCLE.COM]

Your man has given you sound advice.
No worries.
Scott

[Twolanerider]

110 build on a 2004 Road King?

[HD Street Performance]

Mahle's website recommends .001

Please show the link
I expect more such as whether or not the piston is measured to the aluminum or over the coating

[panheadsteve49]

Your man has given you sound advice.
No worries.
Scott

Thanks Scott. Just wanted a second opinion. Steve

[panheadsteve49]

110 build on a 2004 Road King?

Yep. Picked up a 4-3/8 crank & 110 kit for cheap. Will prob use fueling 574's & cut heads though.

[panheadsteve49]

Mahle's website recommends .001

Please show the link
I expect more such as whether or not the piston is measured to the aluminum or over the coating

Measured over the coating. I have read that OEM 110 cyls are not very consistant and are usually a looser fit than the .001" Mahle recomends. Was really looking for someone who had actually measured a few sets. Thanks, Steve

[grc]

Measured over the coating. I have read that OEM 110 cyls are not very consistant and are usually a looser fit than the .001" Mahle recomends. Was really looking for someone who had actually measured a few sets. Thanks, Steve

I haven't seen much reported lately on 110 cylinder taper, but the early versions were famous (infamous?) for having severe taper issues right out of the box.  I remember one dealership employee posting that his dealership returned at least a half dozen sets to Harley when they all measured out of tolerance, but that was several years ago.

If the cylinders you have are tapered, you could return them and get another set and hope for something better from the MoCo, or you could have them machined properly and then fit the correct oversize pistons.  If you're looking for as close to perfection as possible, that's the only way to fly.  If you're looking for commercially acceptable at the most reasonable cost, go with your guys recommendation.


JMHO - Jerry

[HD Street Performance]

The assumption Jerry is that the cylinders are thermally stable.
IME lately they are better and hold tolerance after being used and heat cycled.
These same issues appeared with the 113/120r first issue barrels and that was corrected with a revised dash number. The 113/120r 4.060 barrels are now very close from the MOCO and stay put after they are in service. The early 110 cylinders (same casting as the 113/120r different machining specification) were neither stable or straight and true from the inception plus would change even after a proper bore and hone.

When I hear about tenths measurements from other shops I would want to know about their measuring method, temperature of the parts and gages, the type of gaging, and how and when they were calibrated. Also the configuration of the torque plates can change the result.
Another point where in the bore map is that added clearance.

I do agree Jerry that if those parts are new and the measuring method is sound a new part would be the way to go. Recently I have seen on a few tenths change in new barrels from the MOCO but I admit those have been 96" big bore, 1200 sportster, and 4.060 not 4"