435 horsepower in 1955.....

[BUBBAS IGNITION]

Originally Posted by 38 coupe

How much overdriven would a 3-71 have to be to get 17.5 p.s.i. on a 248 inch flathead?

I had read somewhere that the 3-71 would feed 3x71=213 cu in 8 lbs of boost at 1-1.
If thats real then we would need a 15% over drive to feed the 248 at 8 lbs.
Now to double that to 16 lbs, who knows but it would be a bunch. Over 100%??

Am i thinking correct here ????

[Henry Floored]

Originally Posted by BUBBAS IGNITION

I had read somewhere that the 3-71 would feed 3x71=213 cu in 8 lbs of boost at 1-1.
If thats real then we would need a 15% over drive to feed the 248 at 8 lbs.
Now to double that to 16 lbs, who knows but it would be a bunch. Over 100%??

Am i thinking correct here ????

I believe the same supercharging system placed on two different engines of the same displacement can have very different boost pressures along the rpm curve. An engine that breathes very well will always show lower boost pressure that an engine with a fairly restrictive intake manifold, port, valve system.