> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net
> [mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of TJ
> OK, gotta question here... according to my reading, if you can get 2 heads
> to flow the exact same numbers (230cfm) at say, 28"... one having a 153cc
> intake port w/ a 1.97" valve, and the other having a 180cc port w/ a 1.92
> valve, the head with the 153cc port is better because it will
> have a higher
> intake velocity. IS THIS CORRECT??? OR does the intake valve size change
> this theory because according to hughes engines this is the way
> it works....
> NOW if you look in the 2001 MP catalog, the 2 heads I just
> compared were the
> stock ported mag heads and the R/T heads... the stock ported being the
> better head. How and Why is this??
>
> TJ
The smaller the engine, the more velocity you want. The lower the rpm range
you use most, the more velocity you want. You should also pay attention to
the valve lift at which these flow rates were measured. You'll want the
most flow at something below *your* maximum cam lift. The MP Magnum engine
book has some very good examples.
RayB
http://www.dragtruk.com/ENTRIES/20KM1FD2KWBP.html
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:46:01 EST