Im seriously wanting to add one of the new supercharger setups to my motor, but am concerned that my current motor may be too high a compression motor. I dont want to sound supid, but Im not sure if it is a 9.5-1 or a 10.25 - 1 motor. My guess is the pistons are supposed to leave you with 10.25, but it is actually 9.5. Is there a way to measure once you pull the heads off? What can you do to lower compression? I cant beleive Im considering it, but someone mentioned buying mine since it hasnt been ran yet. This would leave me open to build a blower motor. Any input would be appreciated. TIA
Hi, If you pull the heads, measure how far the pistons are in the hole. You will then want to figure how many CC's your combustion chambers are. To lower the compression, you can always un shroud the valves a bit, and do some combustion chamber work. Opening them up will help lower the Comp Ratio. Once you have done that, you can move to a thicker head gasket. Detriot Gasket makes a composite gasket that's .063 thick vers most composts at .042. This extra .020 should drop your compression about 1/2 point without doing any chamber work at all. I think it's very feasable to run the motor you have on boost, however, if you leave it as a 10 to 1 motor, you will be limitied as to how much boost you can safely run (about 5lbs non intercooled). If you drop it down to 9 to 1, you should be able to run 9 or 10psi .................. Hope this helps,
