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Airflow

1017 Views 13 Replies 4 Participants Last post by  CHEMMINS, 
D2'd
Anyone know how many lbs/min of air an unmodified head with factory cam will flow at a given pressure? The reason I ask is; if a turbo is advertised to flow 80 lbs/min, but our engine requires a pressure of 60 psi to swallow that 80 lbs/min, that high of a PR has forced the charger off it's map and is incredibly inefficient.
Anyone have this sort of airflow info?
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CHEMMINS
Head flows about 150 cfm stock. You'll need to figure out the conversion from cfm to lb/min.
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CHEMMINS
D squared said:
150 with how much pressure forcing it through?
Click to expand...
150 would be with 28" H2O which is equivalent to 1 psi. It is actually like 27.7X to 1 psi...but you get the point.

And that is measured at .400 inches of lift.
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CHEMMINS
Now if you are bored....take all the info posted and plug it all in here - Turbocharger Compressor Calculations and have yourself some merry math.
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CHEMMINS
Kaiboshed that idea.....lol. Now I am looking at Carls Super/compounds setup. Probably a 3.3 whipple feeding a silver 66 over a 95+mm.

Already have a silver 66 in the garage. Looking for a used head for cheap to get worked. Sold the spare 351's.

I figure if I am going to do it.....might as well do it right the first time. Slow build everything on the shelf and take the truck down all at once and do it all.
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CHEMMINS
Yeah, well your plans changed a bit too I see......lol.
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CHEMMINS
A "free" week still costs ya.....lol.
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