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This is a good illustration of what new things can be discovered when you have a good way to analyze things. This comparison on ECcalc22 only changed the baffle design, not the length or beginning or ending diameters. On all three engines (125cc, 250cc, 500cc) the decreasing angle baffle design is the one that gives the most power and the best power curve in the acceleration power graph. But which design you pick also depends on the engine size, powerband width desired, and where the pipe powerband is situated on the engine power curve. So it's always best to try these different designs and see which one you like the best on the acceleration power graph.  Here's the designs on a 250cc engine. If I wanted to race it then I would pick the decreasing angle baffle, but if I wanted it for moderate type riding then I would pick the single cone baffle. If I wanted a mild mannered trail bike I would pick the increasing angle baffle but make it a full 300mm long for the widest powerband.  On a 500cc engine it already has plenty of power so unless I were a pro racer I'd probably make a 300mm long baffle with increasing angle baffle.  HOME |