Originally posted by billlsbird
let me add that my compression ratio is 9:75 to 1, my engine was balanced & it doesn't go much over 5500 rpm's. ..... Oh, I plan on adding an 8:71 to this motor so the Jury's still out on what difference this will make!!! ... Bill....
9:75 to 1 is a bit high for a blower. If you plan to build a blower motor, you should consider how much boost? You may want to o-ring or use head gaskets made to handle the boost. Think about a steel crank, Forged 7 to 8:1 pistons. Aluminum heads? A cam ground specifically for a blower application is important. Carbs. or fuel injection, I would consider fuel injection personally- with a good supply of fuel so you DON'T ever run lean. It would be a good idea to install a programable ignition so you can taylor the timing to the boost. Your going to need a good cooling system. Free flowing exhaust. I know you said the blower is "down the road", but if that's your intention, now is the time to make the upgrade rather than buying parts twice. If your planning to go with an 8-71, I assume you are going to run some hefty boost numbers. Unless you plan to run 7 lbs. or less boost you'll should plan on beefing up the engine. Then after you've made all that new power you'll need to beef up the rest of the drive train and chassis to handle it. Or you can run low boost, but what's the fun in that? Right??