[Matts99Sierra]

I have a 99 GMC Sierra with the 5.3L V8. i put an AEM cold air intake on it and i was wondering how you would go about calculating the CFM that is coming into the engine. thanks guys.

 

[NorthStar]

((cubic inches x .5) x RPM x VE) / 1728 = CFM


Something like that.

Since a carb is rated at 1.5 inches of water pressure drop you would want to have a little higher rated carb.

Volumetric efficiency plays a big role in how much air will actually get into the engine. All sorts of things affect that.

Plus other things like if your intake is a dual plane or open plenum also need to be considered too.

 

[arch]

The calculation you would need to do that is so lengthy, its just not worth it. It'd be better to just bench test the intake.... But If you wanna know the formula for it, lemme know, I'll get one for you.

ack, posted while I was posting.... you could use that for a basic idea... but like he said, there's alot more variables then whats in that calculation.