In article ,
Morgans jisumorgan@charterdotjunkdotnet wrote:

"RJ Cook" wrote in message
. ..
If your blower has an exhaust velocity of 200 MPH the maximum pressure
recovery in a diffuser would be about .7 pounds/in2, realistically about
.5
lbs/in2.

RJ

Sounds like a good swag. How does lbs/sq.-in relate to inches of mercury
(as in manifold pressure)?

30" of mercury is nominally 14.7 psi.

For rough approximations just use a factor of 2