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  #1  
Old 06-21-2015, 07:42 AM
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AAflyer AAflyer is offline
 
Join Date: May 2009
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Default Alternate air?required?

What's the VAF opinion on installing/omitting the alternate air door? I have an IO-360 with Superior sump in an -8.
Pros & cons?
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  #2  
Old 06-21-2015, 07:44 AM
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It is not required but recommended.
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  #3  
Old 06-21-2015, 07:58 AM
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Make a poll Bruce would be interesting to see how many RVs don't have it.
I don't.
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  #4  
Old 06-21-2015, 08:03 AM
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plehrke plehrke is offline
 
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Location: Defiance, MO
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I have had two versions, original magnet and slider. Seemed like the issues were worst then the advantages so permanently bonded a metal plate over the whole thing. Now have none.
I think you should consider having one if you ever fly in snowing conditions (of coarse none of us should fly in known icing conditions)
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  #5  
Old 06-21-2015, 08:05 AM
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Mark Dickens Mark Dickens is offline
 
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The convincing argument, for me anyway, is the proverbial plastic bag blowing across the runway at takeoff. That has happened to others and would be a potential disaster for sure. As much of a PITA as it is, I think it is absolutely necessary.
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  #6  
Old 06-21-2015, 08:08 AM
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Location: Las Vegas, NV
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I have the identical set up: RV-8, Superior IO-360. After reading several horror stories about the doors coming apart, blowing open, etc. I decided to skip it. It seems to me that it adds as much risk as it alleviates. Take my advice for what it's worth! I'm sure many will disagree!

Mark
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  #7  
Old 06-21-2015, 08:22 AM
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ColoRv ColoRv is offline
 
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If there were a leak free, can't fall apart in flight version...I would likely install it. But there isn't. So I haven't. Rv8, superior sump, intake on the ramp.
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  #8  
Old 06-21-2015, 08:27 AM
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Ironflight Ironflight is offline
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It is a risk trade - the risk of the intake becoming blocked versus the risk of the door coming apart and FODing the engine. The anecdotal evidence suggest that there are many more cases of the various versions coming apart than there have been blockages (although they HAVE occurred -apparently rarely). I have personally seen so many air boxes that have shaken and vibrated themselves apart that, for me, the blockage is a lower probability than the mechanism failing - so I dont have alternate air doors an any of our current RV's.

Everyone should make their own choice.
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  #9  
Old 06-21-2015, 08:32 AM
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I've removed quite a few failed/failing vertical induction alt air doors, a number of them have come in with missing pieces (wonder where that went?). I personally don't have one.
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  #10  
Old 06-21-2015, 08:38 AM
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DanH DanH is offline
 
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It is possible to build a good alternate air supply.
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