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Old 02-25-2005, 08:40 PM   #11
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Default CFM

231 Cu. in / 1728 = 0.1337 cu ft

X 4000 RPMs = 534.72 CFM........

Alot of air.............
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Old 02-26-2005, 12:24 AM   #12
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I really need to find my sciance book to see if it has the conversions so I can figure out the flow rate for a 120CU ft tank at 3500psi or 120Cu Ft. at 238.095 atm

1 atm = 14.7 psi
3500psi / 14.7 = 238.095 atm

So the engine at 4000rpm uses 534.72 CFM being pulled from ~1ATM and the tank being reduced to 1atm would be 120cu ft x 238.095 = 28571.4cu ft at 1 atm
28571.4 / 534.72CFM = 53.43 so if the valve would allow the tank to flow there it would beable to support the engine for ~53.5min @ 4000RPMs

So I think if a NA engine was pulling 534CFM and I add pressurised air to the intake it would add some boost or some what of a Ram air affect
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Old 02-26-2005, 03:15 AM   #13
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this pure O2 or just regular compressed air?
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Old 02-26-2005, 07:37 AM   #14
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Default CFM

In order to pressurize the intake, you would need to first make up all of the required CFM and then you would see an increase in boost. IMHO, I wouldn't add pressure to an already weak plastic intake.
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Old 02-26-2005, 01:33 PM   #15
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if its pure O2 then it might make a difference.
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Old 02-26-2005, 09:16 PM   #16
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Default Re: CFM

Quote:
Originally Posted by salmanman
231 Cu. in / 1728 = 0.1337 cu ft

X 4000 RPMs = 534.72 CFM........

Alot of air.............
I've never seen that calculation before, what is the '1738' number?
The calculation I've seen is RPM x displacement / 3456. That'd make it 401cfm at 6000rpm. Thats also assuming a 'doesn't have it' 100% VE.
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Old 02-27-2005, 08:11 AM   #17
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1728 cu in = 1 cu ft
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Old 02-27-2005, 10:24 AM   #18
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Oh well in that case you just forgot to divide by two (only pulls air every other 'rotation').
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Old 02-27-2005, 12:48 PM   #19
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Default conversion

DJ... Right you are ... my mistake.... Still too much to do what he'* suggesting... Just add the turbo and be done with it
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