Quote Originally Posted by Jeri View Post
The pistons I am using are TRW Turbo pistons #L2441F.30 which have the dished heads.
The cam I have is a Weiand mild grind #8130 with an advertisted duration of 290 degrees on both th intake and exhaust, and a gross lift at the valve of .447 - inches on both intake and exhaust. Lobe seperation = 114 degrees, duration at .050 - inch of lift is 223 degrees. I know this might sound like a big cam, but, blowers have a tendency to tame a cam.
Remember I only want to run 6 to 7 pounds of boost.
Thanks for your help.
Jeri
Those pistons, used with a 64cc chamber, should produce a static compression ratio of 8.35:1. Blower Drive Service says that at that SCR, the motor would tolerate 6 lbs of boost on pump gas. 8 lbs of boost would require an 8.00:1 SCR or maybe a shot of 50/50 water and isopropyl alcohol. I know most fellows will talk about methanol, but isopropyl is available at any drug or grocery store, unlike methanol.

Choose the cam based on the rpm range where you want to run. Unlike a naturally-aspirated motor, a blower motor can use all the cam you can screw into the motor and the motor will not complain.

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