ORIGINAL: D Bronk
I think that cutting the taper,and, bore in the same opperation IS the Key..Stewart is Right, about the Squish ,on, a Hemi head though .The Best working example I can give ,is on my Early mod. Race Sled.Its a 1/2 mile,ice oval Racer.The Engine is a 340 c.c.,Hemi head, Twin Cylinder ,Rotary valve,Rotax,Free air cooled,with dual Carbs,and, Twin tuned exhaust pipes,exiting out of stingers The Engine is ported and polished,The Crankshaft runs on ball bearings,and the Rods are on needle bearings @ both ends..The engine is extremly perticular about it`s "Squish"..It needs to have, exactly 0.006",between the piston top and the "Squish Band" ,at the bottom of the head.If the cylinder head is any closer, Detonation occurs,,,any further away ,and, power is lost.....I have an appointment to attend, this morning,When I get back, I`ll look for my Books,they have some good illustrations ,and explanations, about Squish ,and, 2 stroke Hemis.I`ll scan them ,and upload ,if anyone is intrested in seeing them..Let me know
YES, please do let us have that data on squish band. It also seems to work on diesel engines as one diesel button I made had a bit smaller than normal contra-piston and it seemed to give a smoother run than the other on my .074. So I made one with a MUCH smaller CP but this one was the worst of the three.