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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Push rod tubes
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<blockquote data-quote="greg brillus" data-source="post: 130517" data-attributes="member: 597"><p>Having just spent three days this week at a state championship classic race event, I found the rear inlet pushrod tube lower "O" rings leaked quite a bit after each race........ I had added a PCV valve to the breather which came from the hole where the generator normally goes (this on a Comet engine)........The leak occurred for 2 reasons, one is the PCV valve is too restrictive causing too much crankcase pressure, and the second is with the extra added oil pump feeding the cam and followers, there is much more oil being flung around in the timing chest.......Added to that issue, I have not done enough to baffle the outlet from the breather to the vertical line back to the catch tank........The catch tank is quite small with a capacity of about 300 ml and after 2 race events, the tank was near full of oil..........Having said that, the cam and followers are showing no signs of wear, with no visible signs of any metal at the bottom of the timing chest. This proves that if the crankcase pressure is too much, then leaks will occur, no matter what you do. For those interested I came 2nd in my class in a field of about 22 bikes of various kinds and sizes. Cheers for now....... Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 130517, member: 597"] Having just spent three days this week at a state championship classic race event, I found the rear inlet pushrod tube lower "O" rings leaked quite a bit after each race........ I had added a PCV valve to the breather which came from the hole where the generator normally goes (this on a Comet engine)........The leak occurred for 2 reasons, one is the PCV valve is too restrictive causing too much crankcase pressure, and the second is with the extra added oil pump feeding the cam and followers, there is much more oil being flung around in the timing chest.......Added to that issue, I have not done enough to baffle the outlet from the breather to the vertical line back to the catch tank........The catch tank is quite small with a capacity of about 300 ml and after 2 race events, the tank was near full of oil..........Having said that, the cam and followers are showing no signs of wear, with no visible signs of any metal at the bottom of the timing chest. This proves that if the crankcase pressure is too much, then leaks will occur, no matter what you do. For those interested I came 2nd in my class in a field of about 22 bikes of various kinds and sizes. Cheers for now....... Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Push rod tubes
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