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Stock OPS 67 crankcase

The steel ring shrunk into the upper crankcase seat area for the liner lip to sit on can be clearly seen. Also notice the front end was threaded & bolted to the crankcase. This crankcase from a 1978 OPS 67 is the only stock motor I ever tested on the dyno. It produced 5.8 to 6.2 HP on 65 % nitro at 24,000 rpm. Every part in this motor was broken at some time!
The steel ring prevented the liner from crushing the lip in the crankcase.

piston cut-away 001.jpg piston cut-away 001~0.jpg piston cut-away 001~1.jpg piston cut-away 002.jpg piston cut-away 002~0.jpg
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