Fast 650
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SuzukiSavage.com Rocks!
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Valrico, FL
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>Does a 2"pipe make more hp than a 1.5 "pipe ? no it doesn't ! it is more important to keep velocity(flow) up in the exhaust pipe ,
Okay, let's take a look at that. Industry accepted figures are 280 to 300 fps at the rpm you are making peak power.Speeds above that start creating restriction due to friction. With the stock bore, 1.3" ID gives 291fps at 3500 rpm At 6500 rpm the velocity is over 540 fps. In what universe would that not be restrictive?
1.5" is 300 fps at 4800 rpm 1.625" is 293 fps at 5500 rpm 1.75" is 294 fps at 6400 rpm
With the stock bore, either the 1.5" or 1.625" ID would be a good choice. With the 97mm bore, 1.625" would be the minimum size and 1.75" would be the maximum that you would want.
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