Need Formulas

[apex944]

[color=#000000]Can we start a list of links to resources that have formulas relative to this flow bench forum? Perhaps make it a sticky topic so we can come back and find these links easily.

Adding actual formulas to the posts would also be helpful.

Here's a few I cant find for starters:

- Estimated CFM between at various test pressures. (eg: if I'm flowing 130CFM @ 9.5" that equals X @ 28")

- Potential (theoretical) HP given CFM and test pressure.

PS - I found the conversion to 28" :
CFM H2O = 152 x √(28

[bruce]

Look under misc catagory I already have a forum setup for formulas

[larrycavan]

[quote="apex944"][color=#000000]Can we start a list of links to resources that have formulas relative to this flow bench forum? Perhaps make it a sticky topic so we can come back and find these links easily.

Adding actual formulas to the posts would also be helpful.

Here's a few I cant find for starters:

- Estimated CFM between at various test pressures. (eg: if I'm flowing 130CFM @ 9.5" that equals X @ 28")

- Potential (theoretical) HP given CFM and test pressure.

PS - I found the conversion to 28" :
CFM H2O = 152 x √(28

[gofaster]

Horsepower from airflow:
Crankshaft HP = 0.41 x cfm @ 10"

RPM @ peak HP:
(1750/cu. in. per cyl) x cfm @ 10"

CFM @ 10" required for rpm:
[rpm x (cu. in.per cyl)] / 1750

Test pressure (depression) conversion:
[square root of (desired test pressure / known test pressure)] x known cfm
Example, your port flows 140 cfm @ 10", and you want to know what it will flow at 28"
[square root of (28 / 10)] x 140
= (square root of 2. x 140
=1.67332 x 140
=234.26 cfm

[MMack]

Thanks for the info, I have been struggling with this. I had some things transposed or something.

Mike