Thread: Changing compression ona built motor

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With 72cc heads, about the only way to get to 11.5-1 compression is with domed pistons. It you want to get by really cheap, pull the motor apart, find someone with a milling machine, and lop the domes off the pistons. Just make sure you measure the thickness of the dome area to make sure you're gonna have some left when you're done.

TDK, being a machinist by trade and having access to a manual mill I've thought about fly cutting the piston tops to lower compression. These are BTW domed pistons,,,, just don't have the info on what the CC of the domes are. I believe we have an electronic thickness age at work and would verify the thickness before cutting them. Having read Tech's post it too is a option I'm considering. Having the input on components makes building the engine type I'm after a breeze. This may seem wishy washy but I'm still pondering just what engine I want in the car. Mild to wild,,,, at lest I have those options to choose from LOL.