Formula for air required?
12-25-2002, 10:47 PM
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Formula for air required?
Whats the formula to figure out how much air a motor needs at a certain RPM? I remember it had to do with the CC size and RPM with some division, ahhhh I dont remember - anyone?
12-26-2002, 02:42 PM
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Re: Formula for air required? (sparq)
Assuming 100 volumetric efficiency, which changes depending on motor type, forced induction, etc, the formula is:
Air required, in liters/minute = (RPM * displacement in liters * (VE/100))/2
*gets out his TI86 for conversions.......*
For CFM conversion, divide answer above by 28.32
Hopefully I didn't forget anything! This gave 257CFM for my B18C1 at 8100 rpm. Good luck.
-Nick
Air required, in liters/minute = (RPM * displacement in liters * (VE/100))/2
*gets out his TI86 for conversions.......*
For CFM conversion, divide answer above by 28.32
Hopefully I didn't forget anything! This gave 257CFM for my B18C1 at 8100 rpm. Good luck.
-Nick
12-26-2002, 03:16 PM
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Re: Formula for air required? (sparq)
Whats the formula to figure out how much air a motor needs at a certain RPM? I remember it had to do with the CC size and RPM with some division, ahhhh I dont remember - anyone?
VE% for a H22 @ 7000 RPM = 102%
VE% for an S2K @ peak HP RPM = 112%
here are some threads I participated in a while back where we discussed some of what you are asking about. A lot of the stuff I was typing down was stuff I learned from reading Maximum Boost and from a few other sites.
https://honda-tech.com/zerothread?id=96443
https://honda-tech.com/zerothread?id=142398
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