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Bolt-on Tech: 4G63 intake, exhaust, intake manifold, ignition, fuel system, cooling, etc.

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Old 09-13-2004, 10:27 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
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CFM Per HP


Does any one here know a mathmatical formula to convert the cfm flow of somthing into how much HP it will support? Like if it were to flow 600 cfm and support 600 hp.


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Old 09-13-2004, 10:50 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
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That's a good question. Sorry I don't know the answer. Hopefully someone does

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Old 09-14-2004, 12:12 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
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Unfortunately, CFM is meaningless unless it is standardized. You need to know the mass of the air, since that determines the mass/weight of the fuel you can burn (air:fuel is a mass/weight ratio). Thats why it drives me nuts when turbos or compressor maps are rated in CFM. If you can find out in Lbs/min (which is becoming much more popular thee days) you can get an idea. As a general rule of thumb, every lb/min of air is good for 10 HP. Now, several factors affect this, mainly how efficiently you use that air. AFR, timing advance, etc. Its fairly accurate on well tuned cars.

Edit> If you know the temperature and pressure, you can convert CFM to lbs/min by the way. The formulas are out there on the internet I'm sure.


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Old 09-14-2004, 04:02 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
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I found that an average 1.5 cfm is flowen for every 1 HP

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Old 09-14-2004, 10:07 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
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divide cfm by 14.7 and that is lb/min

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Old 09-14-2004, 10:20 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #6 (permalink)
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Quote:
Originally Posted by loreak
divide cfm by 14.7 and that is lb/min
I hope you're joking....

Quote:
Originally Posted by 95GSXRacer
Edit> If you know the temperature and pressure, you can convert CFM to lbs/min by the way. The formulas are out there on the internet I'm sure.
Like he said, you need temperature and pressure to convert.
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Old 09-15-2004, 04:00 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #7 (permalink)
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To get you into the ballpark (engine efficiency and temps have an influence also), but take CFM x .069 = estimated lbs./min
lbs./min x 10 = estimated HP

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Old 09-15-2004, 09:01 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #8 (permalink)
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Quote:
Originally Posted by loreak
divide cfm by 14.7 and that is lb/min
I think you are talking about converting from bar to psi .... 1 bar = 14.7 psi.


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Old 09-15-2004, 09:38 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #9 (permalink)
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Quote:
Originally Posted by 95GSXracer
If you know the temperature and pressure, you can convert CFM to lbs/min by the way. The formulas are out there on the internet I'm sure.
There was a thread a while back on here about it:
Converting between CFM and lbs/min


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Old 09-15-2004, 09:57 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #10 (permalink)
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There is some great information in that thread, thanks doug! Good job setting this up for the archives and such!
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