cranetruck

Chime in and correct me here if I'm wrong.

The engine displacement is 478 cubic inches, which is 0.276 cubic feet.
For 2,000 rpm, the air flow is displacement x rpm divided by 2 = 276 CFM

During turbo boost there is the additional flow as a fraction of atmospheric pressure to add in, so for a boost of 6 psi, which is 41% of 14.7 psi (pressure at sea level). Adding 41% to 276 cfm gives us an an air flow of 389 CFM at 2,000 rpm.

For 2,500 rpm the flow is 345 CFM plus a boost of 11 psi (78%), which gives us 614 CFM.

So, the vacuum measurement above (previous posts) of 8 inches of water is for a flow of 614 CFM.

Bjorn
Virginia's Blue Ridge Mountains
Avatar: XM757 in OK prepared for 1,000 mile trip home. Part of 6,000 mile journey in 2006.
1968 M49A2C modified with 1960 M756A2 truck bed and 1975 HIAB 765A knuckleboom. Heated dual tank system for biodiesel/veggie oil use.
1969 Ford XM757 8x8 5-ton truck tractor W/W, the "improved" MV.
"Some things can't be made better, just differently......a lot of things actually"