[Tom Vaught]

Ok, so now we will figure out the Air Mass (which makes the HP when fuel is added properly)
for the Non Inter-cooled engine and the Inter-cooled engine.

Non Inter-cooled engine first.

Suppose the car an '71 GTO, and it is not intercooled. The temperature in the intake manifold is 257 degrees F.

The car is running 19 psi boost. What is the mass of air the engine is using?

Absolute temperature = 257 deg F + 460 = 717 deg R.

Absolute pressure = 19 psig + 14.7 = 33.7 psia

n (lbs/min)= 33.7 psia x 724.1 cfm x 29 divided by 10.73 x 710 deg R = 92.89 lbs of air per minute (ideal).

lbs air per minute actual = lbs/min ideal x vol. eff. =92.89 x 0.85 = 78.956 lbs air/minute

Now the Inter-cooler car.

The car is running 17 psi boost. What is the mass of air the engine is using?

Absolute temperature = 130 deg F + 460 = 590 deg R.

Absolute pressure = 17 psig + 14.7 = 33.7 psia

n (lbs/min)= 33.7 psia x 724.1 cfm x 29 divided by 10.73 x 590 deg R = 111.8 lbs of air per minute (ideal).

lbs air per minute actual = lbs/min ideal x vol. eff. =111.8 x 0.85 = 95.01 lbs air/minute

95.01 lbs air/minute (Inter-cooled) minus 78.956 lbs air/minute (non Inter-cooled) = 16.06 lbs air/minute improvement.

One lb of air mass will typically make 10 horsepower so 10 HP x 16.06 lbs air/minute improvement = 160 additional horsepower that the vehicle sees due to inter-cooling the air charge.

So your Boosted Holley Carb will be a lot cooler, will make a lot more HP and you will still be using the same sized carb.

Tom V.