Conversion factor for lbs/min into cfm, and vice versa?

[Jester90RS]

I've need to convert the lb/min on a turbo map to the cfm I have for my motor.

Assume sea level and standard temps (actually it's usually over 90 and 30-31" barometer here, but thats besides the point).

Thanks.

 

[Steve Wood]

The formula is included in this article written by John Estill.

http://www.gnttype.org/techarea/turbo/turboflow.html


The article is worth reading if you have not.

 

[Jester90RS]

Thanks much man, the equations in there will be very helpful.

 

[Joe Lubrant]

I agree the information provided by John E. is excellent.

As far as turbo outputs for max. power I use standard rule of thumb:

Lbs per Min. X 10= Max HP Turbo should support.

Lbs per Min. \ .069= CFM

CFM x .069= Lbs per Min.

Close enough.

Just my .02 worth.

 

[strikeeagle]

Too convert any fluid from pounds-mass to cubic feet, divide by the density in units of pounds-mass per cubic foot.


Example:

1 pound-mass of air divided by 0.08072 pounds-mass per cubic foot equals about 12.39 cubic feet.


0.08072 applies to dry air at STP (i.e. 0 degrees Celsius and 1 atmosphere). Density varies with pressure, temperature and humidity.