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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
BTH Electronic Mag Timing Comet -Q?
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<blockquote data-quote="davidd" data-source="post: 119982" data-attributes="member: 1177"><p>Martyn,</p><p></p><p>You may be correct. Jez is running a 105 cam and I don't remember what you are running. Much depends on the fuel, cam and piston together. Jez would be running around a 7.8:1 dynamic compression ratio, so he would not be losing too much from the static CR 8:1 number on the box. In the US, you can run 9:1 dynamic CR on 92 octane premium safely, so my guess would be that he would be well within the limits of the fuel and the cam assuming that he has some selection of fuels.</p><p></p><p>It is relatively easy to set your timing so that it does not knock by retarding the ignition. It is almost impossible to set your timing for maximum power without a dyno. The difference between the two is quite a bit of power.</p><p></p><p>I was still gaining power when I ran out of "slot" at 19 degrees, so I left it there. I had a static CR of 11.23:1 with a dynamic CR of 8.1:1.</p><p></p><p>Your point is well taken that the test rides should be done with an ear to engine sounds.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 119982, member: 1177"] Martyn, You may be correct. Jez is running a 105 cam and I don't remember what you are running. Much depends on the fuel, cam and piston together. Jez would be running around a 7.8:1 dynamic compression ratio, so he would not be losing too much from the static CR 8:1 number on the box. In the US, you can run 9:1 dynamic CR on 92 octane premium safely, so my guess would be that he would be well within the limits of the fuel and the cam assuming that he has some selection of fuels. It is relatively easy to set your timing so that it does not knock by retarding the ignition. It is almost impossible to set your timing for maximum power without a dyno. The difference between the two is quite a bit of power. I was still gaining power when I ran out of "slot" at 19 degrees, so I left it there. I had a static CR of 11.23:1 with a dynamic CR of 8.1:1. Your point is well taken that the test rides should be done with an ear to engine sounds. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
BTH Electronic Mag Timing Comet -Q?
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