Hey was thinking about super chargers on the way home tonite. Why do they have to have lower compression pistons? Is it because the compression is already increased because of the boost being ontroduced into the combustion chamber? just wondering.
I mess with turbos and the compression on a turbo engine has to be low or when the boost kicks in you would detonate big time. There are tricks to get around this by using timing retards or water injection. I would guess the supercharger would pretty much be for the same reason.
Why lo-compression pistons? Superchargers or turbos force more air into the cylinders which would create higher cylinder pressures than normal i.e. more power. If your head gasket isn't made for this it will blow out due to the higher pressures. For street use you don't need a high compression engine the supercharger or turbo would do the same.