Air Intake CFM?

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Mar 15, 2007
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For a stock motor 1FZ, no turbos or SC's, how much CFM does the motor need?

I'm trying to figure out what the CFM draw is to convince myself with data that I need to replace my 7" Donaldson precleaner with a 10".

Anyone have a link to this data?

Thanks
 

ppc

M Go Blue
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Should be able to roughly calculate that figure for a given RPM. It is a 4.5L displacement engine. Convert that to to cubic ft and multiply by RPM.
 
Joined
Mar 15, 2007
Messages
534
Location
Minneapolis, mn
Should be able to roughly calculate that figure for a given RPM. It is a 4.5L displacement engine. Convert that to to cubic ft and multiply by RPM.

Using that formula, I got 0.1589cubic feet * 2200rpm = 349.58CFM

2200 chosen for cruising rpm.

According to this link: Donaldson Full View Pre-Cleaner
The 10" wouldn't even flow enough CFM, not to mention the turbulance arguement that others have mentioned with these precleaners at highway speeds.

Am I doing this right?

Thanks for the help.
 
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Using that formula, I got 0.1589cubic feet * 2200rpm = 349.58CFM

2200 chosen for cruising rpm.
...

It is a 4 stroke, so that would be correct for 4400 rpm.
 

ppc

M Go Blue
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I guess my girlfriend wasn’t lying about having to sleep with my physics professor to get me a passing grade after all. :flipoff2:
 
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ppc said:
I guess my girlfriend wasn’t lying about having to sleep with my physics professor to get me a passing grade after all. :flipoff2:

Haha! That's rough! She sounds like a keeper.
 
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I guess my girlfriend wasn’t lying about having to sleep with my physics professor to get me a passing grade after all. :flipoff2:

:doh: Was that you!! You need to come get her back. She won't leave. :cheers:
 

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