Originally Posted by
got_nitro
Carbon build up on the top of the piston could also be "compensation" for more compression. That dosent mean if you dont want to clean the build up off the top of the piston, you have to ADD a shim either.
I do not think the carbon layer does reach 0.1mm thickness but the carbon layer has a more important function, it act as an heatshield for the piston. Overheating pistons do get weak, the carbon layer does alow the engine adjusted to more performance without overheating the piston.
Originally Posted by
johnny t
I never under stood sleeve pinching, trying to compress hard as glass chrome doesn't seem a good solution. lap honing a new piston to fit is the best solution, I have personally done that. but manufacturers won't sell us just a piston...
Expansion is the word why manufacturers do not sell sepperate pistons. Manufacturers do change materials which can have different expansion rates. With that you want a sleeve that folows the piston best. It is impossible to tell which piston does fit the sleeve and if you do combine different specs piston and sleeve you can notice that right away in several ways but not an perfect running engine