Main Question or Discussion Point
I had someone telling me about drilling small holes, down from the piston crown into the small space "behind" the top piston ring, purportedly to allow the combustion pressure to get into that space and force the ring out against the cylinder wall. The theory is that the gap between the top face of the ring and the adjacent land is too restrictive to permit this pressurization from occuring fully. Anyone here heard of that, tried it? Does this really work? This is in the context of race engines. I have difficulty believing that blow-by between the ring & the cylinder is a big concern (that would rob power) in a race engine, which has fresh rings, good cylinder walls, etc.