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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Carb for Comet
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<blockquote data-quote="davidd" data-source="post: 29050" data-attributes="member: 1177"><p>Howard,</p><p></p><p>That is correct. Stuart Hooper, World's Fastest Velocette, told me he started with a telescoping bell mouth that was 22". Of course, you need an eddy current dyno to do that type of on the fly tuning. The inlet tract is measured from valve to bell mouth and the shape of the radius on the bell mouth has some influence. As I understand it, it is similar to tuning the exhaust. You have to decide what "pulse" or wave you are going after and start with that legnth. The strongest pulse is the second, but it makes for the lognest bell mouth. I suspect most street bikes are tuned for the 4th or 5th pulse, which is the shortest. The calculation is also rpm dependent, so you have to add that variable into the mix. If someone says the best length is 15.25" the question is: "At what RPM?" You can use telescoping intakes and exhausts on a dynoJet, but you have to do separate runs. </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 29050, member: 1177"] Howard, That is correct. Stuart Hooper, World's Fastest Velocette, told me he started with a telescoping bell mouth that was 22". Of course, you need an eddy current dyno to do that type of on the fly tuning. The inlet tract is measured from valve to bell mouth and the shape of the radius on the bell mouth has some influence. As I understand it, it is similar to tuning the exhaust. You have to decide what "pulse" or wave you are going after and start with that legnth. The strongest pulse is the second, but it makes for the lognest bell mouth. I suspect most street bikes are tuned for the 4th or 5th pulse, which is the shortest. The calculation is also rpm dependent, so you have to add that variable into the mix. If someone says the best length is 15.25" the question is: "At what RPM?" You can use telescoping intakes and exhausts on a dynoJet, but you have to do separate runs. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Carb for Comet
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