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piston cut-away 001~1.jpg
piston cut-away 001~1.jpg
piston cut-away 001~0.jpg
piston cut-away 002~0.jpg
piston cut-away 003.jpg
piston cut-away 001.jpg
piston cut-away 002.jpg
Jim Allen

piston cut-away 001~1.jpg

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.
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Album
piston relief areas
Added by
Jim Allen
Date added
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Image metadata

Device
OLYMPUS IMAGING CORP. D595Z,C500Z
Aperture
ƒ/2.8
Focal length
6.3 mm
Exposure time
1/50 second(s)
ISO
50
Flash
Auto, did not fire
Filename
8520-1153333994-piston cut-away 001~1.jpg
File size
65.8 KB
Date taken
Wed, 19 July 2006 2:49 PM
Dimensions
640px x 480px

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