 What do the air plenum flaps do? |
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| Grosbard |
 Mar 30 2021, 04:33 PM
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Member  Group: Members Posts: 88 Joined: 29-September 09 From: Pasadena, CA Member No.: 10,862 Region Association: Southern California 
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Hi all! I'm curious what the air plenum flaps do, and I'm hoping someone can educate me, please. I'm referring to the parts mentioned in this thread:
http://914world.com/bbs2/index.php?showtopic=349044 My guess is that they prevent water and rocks and other stuff from getting to the air-cooled fan...am I correct? Would missing these flaps hurt engine cooling? (I can't see how, but I might be missing some part of the picture) Also, what makes the flaps open? Just the low air pressure on the intake side of the fan? Thanks for your help! |
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| Mark Henry |
Mar 30 2021, 04:55 PM
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Yes they work on air pressure and yes they actually do work.
The heat exchangers have two sources of fresh air, the crank fan and an electric fan. With the electric fan on it opens and closes as the engine goes from idle to higher speeds, it maintains a more constant air pressure. |
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| Grosbard |
Mar 30 2021, 05:01 PM
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Member Group: Members Posts: 88 Joined: 29-September 09 From: Pasadena, CA Member No.: 10,862 Region Association: Southern California
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QUOTE(Mark Henry @ Mar 30 2021, 03:55 PM)  Yes they work on air pressure and yes they actually do work. The heat exchangers have two sources of fresh air, the crank fan and an electric fan. With the electric fan on it opens and closes as the engine goes from idle to higher speeds, it maintains a more constant air pressure. Ah, thank you Mark! So let me rephrase to make sure I understand properly: The presence or lack of flaps doesn't affect engine air-cooling. They're just there to be able to heat the cabin at low engine speed when there isn't enough air flow from the engine air-cooling fan. |
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| barefoot |
Mar 30 2021, 06:07 PM
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Senior Member Group: Members Posts: 1,409 Joined: 19-March 13 From: Charleston SC Member No.: 15,673 Region Association: South East States
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Ah, thank you Mark! So let me rephrase to make sure I understand properly: The presence or lack of flaps doesn't affect engine air-cooling. They're just there to be able to heat the cabin at low engine speed when there isn't enough air flow from the engine air-cooling fan. [/quote] Correct, with electric heater fan on with engine speed low, they close to force more air thru the heat exchangers for cabin heat |
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Posts in this topic
Grosbard What do the air plenum flaps do? Mar 30 2021, 04:33 PM
brant I didn't check your link...
but if your talki... Mar 30 2021, 04:36 PM
Grosbard Hi @[url=http://www.914world.com/bbs2/index.php?s... Mar 30 2021, 04:44 PM GregAmy To further clarify...they're simple doors that... Mar 30 2021, 06:54 PM |
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