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  #1  
Old 03-03-2021, 05:46 PM
sjhurlbut sjhurlbut is offline
 
Join Date: Jan 2005
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Default RV4 air inlet size

Any one running a 180 hp RV4 with circular (sam james) air inlets?

The kit comes with medium sized inlet rings (4 3/8") but I'm considering the larger ones 5 1/4" for more cooling. My engine is slightly more than 180 hp.

Any data points out there or comments?
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  #2  
Old 03-04-2021, 02:01 PM
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vfrazier vfrazier is offline
 
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Default

As cool as my RV-4 runs, and you're in Canada.... are you sure you have, or will have, a problem?
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  #3  
Old 03-04-2021, 05:36 PM
sjhurlbut sjhurlbut is offline
 
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Default No

Donít think I will just curious. Seems like the medium rings are meant for 150-160 hp RV4s.
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Cold Lake, Alberta
7A #70015 - C-FZQX - built - sold
7A #71629 - C-FSIS - built - sold across Atlantic
7 #70215 - C-GOJU - flying - sold
7 #70703 - C-GMIY - flying - sold
6 #60119 - C-FHBZ - built - Airventure 2016 Bronze Lindy - sold
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4 #2723 - building
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  #4  
Old 03-04-2021, 07:16 PM
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DanH DanH is offline
 
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Considering the inlet as a throttle in a system intended to raise static pressure makes no sense...but obviously folks still do it.
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  #5  
Old 03-04-2021, 08:32 PM
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Toobuilder Toobuilder is offline
 
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Not a 4, but my Rocket cools "too well" with less than 5" diameter inlets. I routinely fly in 110+ degree OAT and I dyno'd at way over 300 HP. I also have less than 27 inches of cowl exit area.
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Last edited by Toobuilder : 03-05-2021 at 10:09 AM.
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