I raced the Norvel engines at our local 1/2 races many years ago. I modified the .049's and then the .061's to run 4.5x4.5 props at 29,000 to 31,000 rpm. I was wondering what others have learned about them as to performance. We ran 60% nitro with Doug Gailbreth heads and Nelson glow plugs.
Keith Baker
BME
www.bmeengine.com