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  #11  
Old 03-06-2017, 01:03 PM
rv8ch rv8ch is online now
 
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Default Carb loss question?

Quote:
Originally Posted by DanH View Post
Any current Kitplanes subscriber may click here for a past article, written following a trip to the Airflow Performance school:

http://www.kitplanes.com/issues/33_3...d_21479-1.html
Great article, Dan!

One question that is perhaps answered in the class, and I didn't quite get from the article, is what is the relationship between the "carb loss" and either power or efficiency of the engine?

For example, you show:
Code:
RSA-5  12.75 inches
FM-150 10.0  inches
FM-200  4.0  inches
RSA-10  4.9  inches
FM-300A 2.6  inches
What would be the difference in "performance" of an io-360 with a FM-150 and a FM-200 or a FM-300?

Thanks!
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Last edited by rv8ch : 03-06-2017 at 01:06 PM. Reason: typos
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  #12  
Old 03-06-2017, 01:22 PM
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Raymo Raymo is online now
 
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Default

Quote:
Originally Posted by rv8ch View Post

What would be the difference in "performance" of an io-360 with a FM-150 and a FM-200 or a FM-300?

Thanks!
From what I learned in the class, my understanding is that larger engines pump more air and therefore need a larger fuel servo/regulator to provide more fuel at higher RPMs, which translates to more HP.
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  #13  
Old 03-06-2017, 02:10 PM
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DanH DanH is offline
 
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Default

Quote:
Originally Posted by rv8ch View Post
One question that is perhaps answered in the class, and I didn't quite get from the article, is what is the relationship between the "carb loss" and either power or efficiency of the engine?
Carb loss is simply a reduction in manifold pressure. All things being equal, replacing an RSA-5 with a FM200 would increase manifold pressure by 12.75 - 4 = 8.75 inches of water, or 0.64359 inches Hg.

Things are not always equal. For example, a different manifold may be necessary to get a larger mounting flange diameter.
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  #14  
Old 03-06-2017, 03:13 PM
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Default

If that's the whole story, then I think it's unfair.
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