Quote:
Originally Posted by steve25
Murf, if you want to take maximum advantage of scavenging then number 1, you need to run headers with a merge collector ( expensive) and 2nd, run a open exh with straight pipe length of between 15 to 18” off of the collector.
Also adding to that said above is the fact that your cam is not big enough to take good advantage of Exh scavenging .
What you can to do to help maximized any
scavenging effect that might take place is to reduce reversion .
A good start to this is keeping your 2.11” valve and making sure that your exh port outlets are smaller then the header tubes they are feeding / dumping into.
This type of arrangement restrict’s back pressure from the closed exh system from delaying and contaminating new intake flow, but does allow any vacuum ( negative pulse) that might be made to get into the chamber a kick off a early start to intake flow during the overlap period.
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Cam timing is absolutely the best way to control how scavenging. The rest is just band-aids