!!! - Specs circa April 2004, so cam and compression ratio do *not* match the QAC as-delivered engines - !!! Found on archive.org: https://web.archive.org/web/20030422080238/http://www.revmasteraviation.com:80/products/r2100_engine/r_2100_curve_spec_sheet.htm ========================== R-2100 SPECIFICATIONS Model R-2100, aircraft engine, wet sump Dry Weight - 165 lbs Bore: 92mm Stroke: 78mm Compression Ratio: 8:1 Camshaft lift @ valve: .394, Duration 274 degrees Ignition: Dual CDI, Advance 25 degrees max Spark Plugs: Bosch platinum 14mm (8) Carburetion: Single RevFlow 34mm Fuel: 100LL Oil: 20/50 Exhaust: four into one BSFC: .49 lbs/hp hour