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View Poll Results: RV-9A - Which IO-320 - Which Cowl - Which flow
IO-320 D2A 8 40.00%
IO-320 other (specify) 9 45.00%
SJ Cowl Shorty 0 0%
SJ Cowl Extended forward facing 1 5.00%
SJ Cowl Extended updraft 3 15.00%
SJ Plenum 3 15.00%
VANS Baffles 11 55.00%
Multiple Choice Poll. Voters: 20. You may not vote on this poll

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  #1  
Old 08-25-2017, 08:40 PM
1bigdog 1bigdog is offline
 
Join Date: Jun 2014
Location: Markham, Ontario, Canada
Posts: 104
Default RV-9A - Which Engine - Which Cowl

I can't think of a better way to do this other than a survey. I'm not looking for a debate. I'm no expert on the many varied engine variants of the IO-320 and I want to place my order for the finish kit next week. I'd like to use the SJ Cowl but between updraft, forward facing, sump position, prop extensions it's a bit cumbersome so I'd like to know what has actually worked in practice for others.

My 9a will have an IO-320 with a 3 blade Catto prop and I have no intentions of changing to constant speed.
I'll need a vacuum pad for a gear driven backup alternator (don't know if all engine variants have the vacuum pad).

So the questions whittle down to

Which specific IO-320 variant did you choose? D2A, D1A, other ?

Which Sam James Cowl? Shorty, extended updraft, forward facing?

Did you use the SJ plenum or VANS baffles ?


Greatly appreciate the input.
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  #2  
Old 08-25-2017, 08:53 PM
dwranda dwranda is offline
 
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Location: Jamestown,NY
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Default

Can't wait for some responses! Very interested as well!
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  #3  
Old 08-25-2017, 09:22 PM
qtrmiledan qtrmiledan is offline
 
Join Date: Jan 2005
Location: Baton Rouge,La.
Posts: 140
Default Cowl choices

O320 D3G converted to IO320, vans baffles with home brew plenum, James extended cowl, was carbed, so it's updraft. Used James air filter kit.
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  #4  
Old 08-25-2017, 11:59 PM
RicoB RicoB is offline
 
Join Date: Mar 2017
Location: Glendale, CA
Posts: 76
Default

O-320 E2D not sure what cowl yet
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  #5  
Old 08-26-2017, 08:24 AM
gfb gfb is offline
 
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Location: Madison, WI
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Default

Titan IO-340, used the vans baffles/cowl but would happily try the SJ option next time.
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  #6  
Old 08-26-2017, 08:42 AM
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KRviator KRviator is offline
 
Join Date: Oct 2009
Location: Sydney, Aust.
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Default

Quote:
Originally Posted by gfb View Post
Titan IO-340, used the vans baffles/cowl but would happily try the SJ option next time.
Same here, but using the O-340. Vans Cowl & Baffles.

Only hiccup was the Rotec TBI I used is slightly shorter than the traditional carb so I had to make my own FAB. If I were doing it again, I would go with EFI and the snorkle-less cowl, with a basic cone-type filter, but the Rotec starts easily and I'm quite happy with it!
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  #7  
Old 08-28-2017, 06:43 AM
Neal Trombley Neal Trombley is offline
 
Join Date: Aug 2016
Location: North Fort Myers
Posts: 203
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Not that far along yet, but I think by OSH 18 I will be..

My guess IO320 with CS and 3 blade
My goal is economy and smoothness

Not sure of Cowl
Sam I see every pancake breakfast at our EAA66... I guess I should look into them
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  #8  
Old 08-28-2017, 08:09 AM
Alex_K Alex_K is offline
 
Join Date: Aug 2010
Location: Moscow, Russia
Posts: 44
Default

I have Titan IOX340 with normal Vans baffles and cowl.

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Last edited by Alex_K : 08-28-2017 at 08:12 AM.
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  #9  
Old 09-22-2017, 08:18 AM
1bigdog 1bigdog is offline
 
Join Date: Jun 2014
Location: Markham, Ontario, Canada
Posts: 104
Default Thanks

So first, thanks for the responses and the inspirational photo.
What I really learned is that my learning curve was nowhere near complete. I thought I had asked an easy set of questions.

What I can extrapolate is that most purchased the VANs cowl and appear to be using vertical draft and and the VANS baffle. Given my home base and where/how I intend to fly it became clear the vertical sump gives what is needed for heat muffs (something I never considered when I first asked the question).

Cheers.

Michael B.
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  #10  
Old 09-22-2017, 03:34 PM
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Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 1,266
Default 2 up fully loaded out west

2 up fully loaded out west I would have used an extra 20 HP.
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