Hi,

I am getting about 300 ft/s velocity through a 73mm opening. Boundary conditions for this hand calc are just ambient pressure and temp of air.

My calcs are telling me that at 800 CFM at STP the velocity through a C&L MAF is near mach 0.3. I find this difficult to believe.

My air density is 0.074 lbm/ft3
cross sectional area is 6.487 in2 = 0.045 ft2
mdot = rho * A * V doesnt lie

Does 1 lbm/s mass flow sound reasonable for a naturally aspirated 302 cu-in engine with AFR 165s and supported mods such as TB, MAF, manifold etc...

 

I think your drive belt is a little loose.

 

sorry I dont understand.

Are you being sarcastic or is there some effect that a loose drivebelt has on the inlet velocity of air of my engine?

 

If your talking 1lb per mili second, it dont sound right.


A t-70 can move about 71 LBS per minute. This on a 302 is ruffly off the top of the head no calc) about 650-680 RWHP on a 302 (ruff guess)

Thats a minute.


I dont see a n/a motor doing that unless it was hella built, even then.........

 

Yeah ^^^ the only problem I see is with the 800 CFM, thats a lot for an N/A 302 how high are you revving this engine? 9k+ rpms for 800CFM according to my calculations, and thats on really high VE.

 

I just redid my calcs. at about 85% VE my engine would consume 445 CFM at 6k RPM. Velocities reach 160 ft/s which is still high but more believable.

 

Yep sounds alot better.