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Originally Posted by Steve C.
Ok between the two, and setting aside the minimal differance in air flow.
One set-up with a little deeper chamber and flat top piston, with no dish and only valve reliefs, for 10.5 compression. And the second with a little shallower chamber and a piston with a 20cc dish for the same 10.5 compression.
Is there any flame front and/or burn pattern issues with the deeper 20cc dished piston compared to the flat top piston ?
I was told by a friend about a discussion years ago with Jim Butler and at the time Jim favored a flat top. This came during a discussion about milling out a dish on a TRW piston to make them pump gas friendly with a small chamber iron head.
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From what I've read, putting as much of the combustion chamber as you can
in the piston itself is beneficial.
Aren't some of the best engine builders using heads with a tiny or even close to no combustion chamber along with a properly shaped dish in the piston these days?
I know this is the street forum, but wouldn't it be a good idea to mimic this type of build on a street engine if the additional cost for a
properly dished piston is somewhat minimal in comparison to the rest of the build? That's all I'm getting at.
