CFM required for 300RWHP performance?
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
CFM required for 300RWHP performance?
Hey guys my Lingefelter and Chevy Perfomacne books I bought from Amazon have not arrived yet so I am wondering about the amount of CFM that the system needs to flow from the plenum thru the runners and thru the heads. This to achieve 300RWHP
This may be a whacked out question so slap me if its :lol:
This may be a whacked out question so slap me if its :lol:
Le Mans Master
Joined: Apr 2000
Posts: 6,341
Likes: 1
From: Shelton CT
Re: CFM required for 300RWHP performance? (ld85)
I dun think thats an exact science.
I've seen cars with BONE stock engines and just a supercharger
and they flew enough for 400+HP at the Rear wheels even.
Even If you get enough flow for like 240cfm+ through the heads,
more than 800 through the TB/plenum (800 is a VERY good port job with 52mm TB I believe), it won't help get to 300HP at the wheels unless you change at least the cam in there.. You need to worry about flow #'s once you already have the 'demand' of your engine for them. Going the other way around won't help you much.. :cheers:
I've seen cars with BONE stock engines and just a supercharger
and they flew enough for 400+HP at the Rear wheels even.
Even If you get enough flow for like 240cfm+ through the heads,
more than 800 through the TB/plenum (800 is a VERY good port job with 52mm TB I believe), it won't help get to 300HP at the wheels unless you change at least the cam in there.. You need to worry about flow #'s once you already have the 'demand' of your engine for them. Going the other way around won't help you much.. :cheers:
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Re: CFM required for 300RWHP performance? (MrNuke)
The heads will be ported to at least 240 CFM and I will use a Super Ram with a cam that is right for the setup!
I guess I probably have answered my own question. The SR will flow in excess of 240CFM as will the ported de-screened and de-finned stock Throttle Body. So the heads will create some back pressure in the system. I will wait for flow numbers on the heads to determine the cam specs.
I guess I probably have answered my own question. The SR will flow in excess of 240CFM as will the ported de-screened and de-finned stock Throttle Body. So the heads will create some back pressure in the system. I will wait for flow numbers on the heads to determine the cam specs.
