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[SBB]

I'm confused (doesn't take much sometimes) are you guys saying rev perf cylinders are dimensionally unstable from a design defect or it happens from the powder coating  process or both?

What I'm saying is that I paid good money many years back for some of their cylinders that were crap.
They refused to make them right.
That was many years ago and the company may be ok now but the owner is still the same and my happy ass would walk before I used their products on a motorcycle I own.
That's all I'm saying.
Please read the thread again for clarification on cylinders going out of round after powder coating.

 

SBB

[RRG08]

Ok thanks. It makes me wonder if the powder coat baking can cause issues, what about the thousands of heat-cool the cylinders go through in normal riding?  On a related note took my 09 in last week for the engine paint flaking, and now hd has granite  paint in aerosol. I question how durable it would be to just paint over silver cylinders.

[Talon]

But those heat cycles are when the jugs are torqued down on the motor and the heads are on.

Craig

[Twolanerider]

Red powder coating got him 5 HP! Right 2L. 

Damn right.  And that's per cylinder.  Plus another five each for the diamond cutting.  And all that's just the jugs.  God knows how much more was gained coloring and cutting the heads and bridges.

[Twolanerider]

Ok thanks. It makes me wonder if the powder coat baking can cause issues,

As related to me by shops that work with it regularly it could; with emphasis on the "could."  I told Axtell I was buying their cylinders either way.  And I could live with or without the powder coating.  Then asked for their recommendation and told them I expected them to stand by the jugs after the work was done since I was following their recommendation.  Chaz (at Axtell) didn't flinch saying they were fine if Sumax did the color work.

I had my administrative issues with Sumax.  What a CF trying to get things moved through their shop and sorting out hassles they caused.  But the color work itself was ok.  More importantly according to Axtell they do whatever they need to in processing and/or handling that the finish machining isn't jeopardized by their work.

Don't get me wrong.  I'd rather take a swift kick in both nads from a long legged woman in heavy boots who understood the concept of inertia before I personally sent anything to Sumax again.  That's perhaps the biggest reason the SERK project won't see parts that get final critical machining have any color work done.  But my problems with them wasn't the actual application of the color work they did.