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Dear Greg,Sorry Guy's been away on a local bike rally this weekend........ My thoughts on the use of the oil feed to the rear.........As the crank and rod assembly rotate in a clockwise direction from the timing side, it makes sense that the oil flung from the bigend is aiming at the forward wall of the liner, this is not the thrust face which is at the rear. It is obvious that it must still get lubrication if the feed is blanked off, but I still maintain that the thrust face at the rear is where the lubrication needs to be.
My understanding of the squish band angle is the 90 degrees gives the largest gain in performance based on turbulence. However, it is more prone to detonation than the 30 degree squish band due to the sharper edges. I stuck with 90 degrees because it was well tested by Ian Hamilton and was easy to do. I never had any detonation issues.My understanding of a squish band is that they actually work better if the band tapers from the outside inward and if the angle is about 30 degrees angled upward on the piston crown and the outer area of the combustion chamber. This gives a much better power output than just a flat band that we have with these heads.