Description
This is the O.S. Speed R21GT engine for the 1/8th GT on-road classes. Designed with the forth coming 1/8th GT IFMAR World Championship in mind, the engine builds on the proven R2101 crankcase which was refined as was the 5+3 ports liner and piston to meet current IFMAR rules.
Tech specifications:
Displacement: 3.49 cc
Bore: 16.08mm
Stroke: 17.20mm
Intake ports: 5-port
Exhaust port: 3-port