Ted B

iTrader: (6)

Given the recent release of Cosworth's new cylinder head, I thought it might be interesting to make a rough comparison of head flow data. I used Cosworth's data for the stock head, their head, and inserted Buschur's data from the percentage improvements at various lifts as claimed by Buschur. I could not insert AMS' data because I don't have it.

This is intended for purposes of discussion only, so don't take this as gospel. It's just a thumbnail sketch that is only as accurate as the data used.

dubbleugly01

iTrader: (24)

The obvious question.... why use anything over a .50 lift cam on a stock head?

Ted B

iTrader: (6)

AFAIK, there are no EVO cams with that much (0.5") lift.

Actually, it appears flow begins to drop off on both the Int and Exh sides around .30" lift (7.6mm)on a stock head.

dubbleugly01

iTrader: (24)

right.... I'm not aware of any cams that have that lift either.

The point I was trying to make was the cams that advertise "high lift", like Revolver, have no benefit on a stock head. My bad, should have been more specific. A 10.xx mm lift cam should be plenty good for a stock head.

jj_008

iTrader: (8)

Good post. I have always figured that high lift cams wouldn't have a real benefit on a stock head.