How much does the A20 suck?

**headtrip** · 08-03-2002, 08:01 AM

ok, bone stock, no mods, how many CFM does the A20A suck at idle and at redline. Does anyone out there have a plot chart of this? I'm looking at the idea of custom hacking forced induction and want to know what i have to overcome to even start to apply boost.

**Sabz5150** · 08-03-2002, 08:18 AM

Sup Trip?! Here's your answer

Air Capacity (cfm): Since an engine is actually little more than an elaborate air pump, it’s ability to perform work—measured in horsepower and torque—is a product of its capacity to inhale and exhale air. An engine’s theoretical air capacity is a product of its rpm and displacement, divided by two (since only half of the engine’s cubic capacity is being displaced during each stroke). For purposes of rating airflow (i.e. via a carburetor), this formula is converted to a quotient reflecting cubic feet per minute (cfm) by dividing both sides of the equation by 1,728, the number of cubic inches in a cubic foot. The reduced formula for cfm:

Rpm x displacement / 3,456

**headtrip** · 08-03-2002, 08:46 AM

i know the math involved here. so let me narrow this down a bit more. what is the displacement of at A20A. so i can work the math and see how hard i gotta blow.