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Bored&Stroked · 12-11-2023, 08:35 AM

Hey Pete, have you ever tried any type of flat-top popup piston? Would seem that you'll still get the compression, but open up the roof of the chamber? Obviously, this is what Harley did with the KR - about a 3/16" pop-up. This is what I did with the FlatCad - to mimic the Harley. BUT, I've never had the luxury of time, money and a dyno to try different combinations.

I'd love to have a 1-cylinder engine with a flathead port, head, chamber setup - to test all sorts of things on a motorcycle dyno! LOL

Or maybe cutup a block and make a V-Twin flathead for testing.

12-11-2023, 08:35 AM	#77
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,910	Re: Shoud I relieve my block Hey Pete, have you ever tried any type of flat-top popup piston? Would seem that you'll still get the compression, but open up the roof of the chamber? Obviously, this is what Harley did with the KR - about a 3/16" pop-up. This is what I did with the FlatCad - to mimic the Harley. BUT, I've never had the luxury of time, money and a dyno to try different combinations. I'd love to have a 1-cylinder engine with a flathead port, head, chamber setup - to test all sorts of things on a motorcycle dyno! LOL Or maybe cutup a block and make a V-Twin flathead for testing.