why does the air intake on the 3.9 constrict - Defender Source
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  #1  
Old December 12th, 2011, 06:57 PM
cdb
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Clark Bowen
1969 Series 2a/OM617 Bugeye 88"
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why does the air intake on the 3.9 constrict

Starting from the air filter box intake (1995 RRC in this case); it expands through the intake trumpet, then expands about 1/2" when it exits the air filter box into the hose that connects to the MAF. On the other end of the MAF it shrinks a small amount and then when it hits the plenum intake (right before the throttle plate) it shrinks again by about 1/4".
It would seem to be very restrictive - especially the intake horn - at higher RPMs, but maybe I'm missing something.
Venturi effect?
Keeps water out of the filter housing?
Does anyone know why?
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  #2  
Old December 12th, 2011, 08:15 PM
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Phillip
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To keep it quiet because women were complaining about intake noise. Run the canister style RRC intake without the trumpet its really loud. IIRC the piping on the RRC airbox is the same diameter after the maf.
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Old December 13th, 2011, 12:32 AM
cdb
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Clark Bowen
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Philip.....

What does IIRC mean?
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  #4  
Old December 13th, 2011, 06:22 AM
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Andy
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Quote:
Originally Posted by cdb View Post
Philip.....

What does IIRC mean?

If I Remember Correctly
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