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<x-charset iso-8859-1>Brian: Let me see if my old brain still remembers this correctly. I read a book back in the late 60's early 70's on tuning high performance engines. You actually want the exhaust system to scavenge when the exhaust valve first opens, but want back pressure just before it closes. This helps suck the burned fuel out of the cylinder, and promote flow. just before the valve closes, you should actually be sucking the new fuel air mixture out of the exhaust valve. The back pressure then pushes this mixture back into the cylinder. On 2 stroke bikes with expansion chamber pipes, this was what they called being on the pipe. The problem is that it only happens in a narrow RPM range. Robert M. "Mike" Bradford Nampa, Idaho rmbrad@velocitus.net ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/ </x-charset>