Lightweight billet pistons
- Thread starter jseng1
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- Nov 17, 2009
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- 127
This is a long ongoing project as all three of us are not often able to find the time to develop the engine further so hopefully we can finish this winter and start on the new gearbox.
Can´t remember the small end weight but I think they were lighter or at least not heavier than the aluminium rod ends. Accidentally we had them running at way over 8000 revs as my buddy forgot to set the limiter on the Schenck dyno. Nothing broke or collapsed - so maybe they are fit for road/race use. Norton crank gives now 90mm stroke and car shells are used. Had some lube problems at the piston pin but this was due to not enough oil reaching the upper end of rod, despite the 0,5mm oiljets that squirt under each piston. Oiling is difficult as the pin is boxed like any reasonably modern design so I machined a window into the shielding wall and gave the pin a dl coating - problem solved.
Can´t remember the small end weight but I think they were lighter or at least not heavier than the aluminium rod ends. Accidentally we had them running at way over 8000 revs as my buddy forgot to set the limiter on the Schenck dyno. Nothing broke or collapsed - so maybe they are fit for road/race use. Norton crank gives now 90mm stroke and car shells are used. Had some lube problems at the piston pin but this was due to not enough oil reaching the upper end of rod, despite the 0,5mm oiljets that squirt under each piston. Oiling is difficult as the pin is boxed like any reasonably modern design so I machined a window into the shielding wall and gave the pin a dl coating - problem solved.
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