How much is too much ? - calculte required flow ?

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Postby Unkl Ian » Thu Sep 22, 2005 8:55 pm

How do I go about calculating the required airflow,
if I know cylinder displacememt and rpm range ?

Putting big ports on a small motor won't get the effect I want.

I'm sure I had a link to a airflow calculator,but can't find it now. :(

Thanks.

Ian
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Postby larrycavan » Fri Sep 23, 2005 12:03 am

Ian,

Here's an online calculator
[URL=http://www.wallaceracing.com/flow-rpm.php[/URL]
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Postby larrycavan » Fri Sep 23, 2005 12:11 am

Here's a couple from Superflow that should come in handy.

RPM= [2000/CID] X CFM@10"
For a full out racing engine use 2200 instead of 2000.

HP=.43 X CFM@10"

Safe Peak RPM = 22,000 / in. stroke
Max Peak Power RPM = 27600 / in. stroke

The last two use 3700 ft.\min piston speed as the safe limit.

Larry
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