![]() ![]() But the main idea here is that the narrower the band, the less air/fuel is guarded under the squish band to burn later. You need a squish velocity calculator to juggle the width, clearance, and velocity. #SQUISH HEAD INSTALL#You can install a thicker head gasket to increase the squish clearance to also increase the squish volume but if that results in less power then you'll know your engine wanted a shorter combustion duration, not more, and so you can lathe down the head or cylinder mating surface as long as you don't reduce the squish clearance to less than. Maximum Recommended Squish Velocity according to peak power RPM: Otherwise the only obstacle is to not have the velocity so high that it causes detonation or overly scatters the combustion flame which lowers power. 6mm squish clearance messes with the needed boundary layer of air/fuel over the metal, so don't go less than that. The wider the squish band and smaller the squish clearance, the faster the squish velocity. If CPD is too short then you have the bulk of the pressure happening when the angle between con rod and crank is not very good so less power contributes to crank rotation which lowers engine power. If the combustion pressure duration (CPD) is too long then pressure is lost out the exhaust port which should of been used to push down the piston and rotate the crank. The higher the port and the higher the RPM, the shorter you need to make the combustion pressure duration with a skinnier squish band. That duration needs to match the time duration between TDC and port opening which can be called the power stroke duration (PSD). The wider the band, the longer the combustion duration. So the more mix is guarded there, the longer the combustion time. The air/fuel under the squish band burns later than the bulk of the mix in the dome. The width affects the length of time of combustion. ![]() Other factors: carb size, engine compression, and ignition timing. The squish band is one of the factors affecting engine power. ![]() Squish Band Velocity and % Area ALL ABOUT THE SQUISH BAND ![]()
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