PTS Flowbench Forum

Bore x Bore x stroke x RPM x .00353= ___________/ 613.8=____
4.03 x 4.03 x 3.58 X 5,000 x .00353=1026.21375/613.8=1.67 ????? Diameter????? or Area?????

I know this has nothing to do with the flow bench but i'm really hoping to get a answer.
If this is diameter then i can upen up my throat a lot......if its area, then i can't do much.

also i can convert diameter to area but don't know how to convert area to diameter....

Example 3/8 valve stem........ .375 x .375 x .7854= .11044688(.11) so i can us this to convert throat Diameter to Area
but how do i convert Area back to Diameter.

Thanks in advance
Flash

Please help
If it has been explained elsewhere. Please point me to it.
I just need to get my head clear in converting from diameter to area in inch and back.

Thanks as always

Flash

I have absolutely no idea what you are trying to do here Gordon ??

Converting diameter to area is pretty straightforward.
Area = Pi x radius squared (radius being half the diameter).
If you have a three inch diameter circle, radius will be one and a half inches.
First you multiply radius x radius to get radius squared. 1.5" x 1.5" = 2.25
Then you multiply that by Pi.
2.25 x 3.14159 = 7.068 square inches.

To convert area to diameter.
Radius = the square root of area divided by Pi.
Suppose you need a pipe that has eight square inches of flow area.
First you divide the area by Pi. 8" divided by 3.14159 = 2.5429924
Then you take the square root of that = 1.5946 which gives the radius.
The diameter will be twice the radius, so diameter = 1.5946 x 2 = 3.189 inches internal diameter pipe required.

Thank You vary much Tony, this is vary important to me that i get this right.

Now i need to take this and apply it. I would have to right a page, of what i'm doing but you will understand soon.

I may be, back with one more variation to this math.
Thanks
Gordon.

Ok that all works for me.
Now can you tell me if this is area or diameter? this math was gave to me a life time ago, from Darin Morgan. I know that the 613.8 number is a mock .55 air speed number. but don't know if this math translated to diameter or Area (sq in)

4.03 x 4.03 x 3.58 X 5,000 x .00353=1026.21375/613.8=1.67 ????? Diameter????? or Area?????
M.C.S.A (aka Area).....Or Diameter

If i had that answer I would be golden.

I have search on the speed talk forum and the bullet forum, but no firm answer, just chest Pounding .............................................

Example=> ProStock 500 cid

4.115 Sq.Inch Area = ( 4.687 * 4.687 * 3.62 * 9000 * .00353 ) / 613.9758744

where 613.9758744 = .55 Mach


I emailed you a text file I can't attach it here for some reason . . .

Bruce and Tony, thank you both for your time.
Bruce i found the email you sent me.
I will go over it all next week and get back to you.
As this week is dedicated to getting ready for a drag race.

Thanks
Gordon