Try this,

 

Your engine is an air pump.  For a 4 cylinder aircraft engine each revolution has 1 cylinder drawing in air, 1 compressing air, 1 firing and 1 exhausting combustion products.  Thus, 1 revolution consumes 1/4 x 360 cubic inches or 90 ci or .625 cubic feet. At 2700 rpm and WOT, that's 2700 x .675 cf or 1688 cfm.  Lbs/Hr depends on air density.

Scott,

 

Further to my last post and in answer to my own question, you appear to have divided cubic inches by 144 to get cubic feet. Should have divided by 12 cubed or 1728. I did the same thing, which results in 12 times too much carburator.

 

I think we've been out of school too long.

 

Rob