Crazyquik

Anyone ever worked or dealt with an exhuast system that was overscavenging? Sucking the intake charge out the pipes where its ignited in the header primaries. I know the race Flowmasters have warnings on them about it. I'm thinking this would be directly related to the exhuast duration more than anything else. What about lift on the exhuast side? Would running less duration and more lift help cure the overscavenging? That should be the route to picking up the most amount of power.

Like maybe a 226/228 .550/.575 instead of 226/230 with ~.550-.560 for example.

J.

[ December 01, 2001: Message edited by: Crazyquik ]</p>

Crazyquik

ChrisB, 2quick4U <img src="images/icons/confused.gif" border="0">

ramairJP

iTrader: (3)

I know that running headers that are too small for an engine can lead to over-scavenging the exhaust. Often times this can become a problem on motors that have an excellent flowing exhaust port. One way to fix the problem is, of course, to bolt on some larger headers with bigger primaries. Another solution would be to go to a single pattern cam (or at least to pull some duration like you described). Going to that would pump up your midrange hp a lot and maybe give you a touch more on top. Probably the best solution, however, would be both... a larger header and a single pattern cam.

John