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Joined: Sep 2010
Posts: 168
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Sep 2010
Posts: 168 |
Looking for the airflow in cfm for a 261 cu in @ 2400rpm. thanks in advance
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Joined: May 2002
Posts: 6,149 Likes: 42
ChatMaster - 6,000
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ChatMaster - 6,000
Joined: May 2002
Posts: 6,149 Likes: 42 |
I wont say my method is correct but I mulitply the 261 ci X half engine speed gives you the ci/m then divide by 12.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Sep 2010
Posts: 168
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Sep 2010
Posts: 168 |
that calculates out a little out of proportion, but if you divide by 1728 cu in/cu ft instead of 12 then the answer comes out much more reasonable. thanks
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
Yes you have to divide the cubic inch displacement by 12x12x12 to convert to cubic feet. That total is 1728 as it is a three sided cube 12 inches on a side. And you have to use 1/2 the engine speed because each cylinder only takes in air every other revolution.
How Sweet the roar of a Chevy four!
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