newt
If the heads flow ~ 50 CFM more on the intake side than on the exhaust side, why does anyone run single pattern cams? It would seem to me that a split pattern cam w/ quite a bit more duration on the exhaust side would be needed to even come close to matching the intake flow.
Am I looking at this right? Any smart guys out there that can explain this to me?
If matching the flow does make sense, how much more duration is needed to make up for the 50 cfm difference? Most of the split cams I've seen have between 6-12 degrees more exhaust duration. Playing w/ desktopdyno leads me to think that even more exhaust duration would be beneficial (like 210 intake/230 exhaust @0.05 for example). Am I way off base herre or what?
radamx
I am not a smart guy but here it goes.
You are sucking on the intake side at between 0 and say 14 pounds of vacuum. and the exhaust side has lots of pressure .
As in cylinder pressure.
.From my experence if you have any less than 80 percent exhaust flow.A split duration is advantages. But if you are 80 or above a straight duration cam will work better
Just my opinion good luck
Dusty
Yep newt. with the edelbrock heads flow was about 70% i should have gone dual pattern but hind site is 20/20 after talking with howards in depth, they even thought a more agressive cam would better suit me. im not too worried things will still work out for me, the single pattern cam is already in so it'll have to work. If not then i'll think about a change but im still impressed with the cam and its characteristics.
