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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust reversion
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<blockquote data-quote="davidd" data-source="post: 48880" data-attributes="member: 1177"><p>Like David in the fist response, I would be surprised if the overlap of the MK1 would cause horrible reversion. I run 100 degrees of overlap on the Comet and while waiting to go out on the track I can look down and see the gas billowing out of the intake. On the track I run between 4200 and 7000 RPM's and there is so much momentum of the outgoing exhaust and the incoming intake that there is no reversion. I would guess that the MK1 has 50 plus degrees of overlap, about half of what I run, and you will get only wisps of gas coming out at idle, unless the cam has a lot more overlap than advertised.</p><p></p><p>You are also correct that a more restrictive exhaust will exacerbate the problem by making it more difficult for the exhaust charge to exit with a lot of momentum. I would think the original spiral baffle would be the least restrictive, short of a straight pipe. I know several owners who have liked the Supertrap very much, but I would not change unless your silencer is restrictive.</p><p></p><p>I am not sure that you would notice anything if you did not run an air filter. If everything is set up correctly, you will get a little mist escaping at idle, but not excessive. John Renwick dyno tested the Club silencer at the time it was first offered and I think I saw it recently in the PDF's on the Club site.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 48880, member: 1177"] Like David in the fist response, I would be surprised if the overlap of the MK1 would cause horrible reversion. I run 100 degrees of overlap on the Comet and while waiting to go out on the track I can look down and see the gas billowing out of the intake. On the track I run between 4200 and 7000 RPM's and there is so much momentum of the outgoing exhaust and the incoming intake that there is no reversion. I would guess that the MK1 has 50 plus degrees of overlap, about half of what I run, and you will get only wisps of gas coming out at idle, unless the cam has a lot more overlap than advertised. You are also correct that a more restrictive exhaust will exacerbate the problem by making it more difficult for the exhaust charge to exit with a lot of momentum. I would think the original spiral baffle would be the least restrictive, short of a straight pipe. I know several owners who have liked the Supertrap very much, but I would not change unless your silencer is restrictive. I am not sure that you would notice anything if you did not run an air filter. If everything is set up correctly, you will get a little mist escaping at idle, but not excessive. John Renwick dyno tested the Club silencer at the time it was first offered and I think I saw it recently in the PDF's on the Club site. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust reversion
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