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  #1  
Old 04-26-2018, 04:01 PM
N733JJ N733JJ is offline
 
Join Date: Jan 2005
Location: Wappingers Falls, NY
Posts: 202
Default Plenum with stock cowl

I know this has been asked many times but a search does not show any current info. Is anyone making a plenum that will match up with the stock RV-8 cowl?

Scott A Jordan
80331
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  #2  
Old 04-26-2018, 05:59 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is online now
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,427
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Iíve been looking as well - no joy.

I used the James Cowl and plenum on the RV-10 and got great results. I would have done the same for the new RV-8 project but the James RV-8 cowl requires a prop extender that I did not want to use. I did see one RV-8 that used the James plenum with a stock cowl, but he had to do a lot of glass work to install the round inlet rings (the James plenum is designed for the round, alumni inlets). Also complicating the install is Iíll have the IO-360-M1B engine with horizontal injection.

Iím still debating if Iíll go that way or not (engine mount next week so my time is running out).

Carl
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  #3  
Old 04-26-2018, 08:01 PM
Bicyclops Bicyclops is offline
 
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Location: LA, California
Posts: 139
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Make your own: http://www.vansairforce.com/communit...=plenum+vacuum

Ed Holyoke
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  #4  
Old 04-26-2018, 09:05 PM
Mark H Mark H is offline
 
Join Date: Jul 2011
Location: Indianapolis, IN, USA
Posts: 31
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I made my own using the stock cowl for my -7A. I secured the lid to Vanís baffles by adding a strip along the back and bending the sides in slightly. The hardest part was getting a nice seal around the top of the inlets. I used Vanís baffle material secured to the top cowl that lays up nicely inside the plenum. Itís really not too hard to make and I would do it again verses the baffles.
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  #5  
Old 04-27-2018, 09:52 AM
BillL BillL is offline
 
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Location: Central IL
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Quote:
Originally Posted by N733JJ View Post
I know this has been asked many times but a search does not show any current info. Is anyone making a plenum that will match up with the stock RV-8 cowl?

Scott A Jordan
80331
You don't have to have one, but is there a technical reason you desire a plenum (cover)?
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  #6  
Old 04-28-2018, 06:11 AM
N733JJ N733JJ is offline
 
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Location: Wappingers Falls, NY
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Quote:
Originally Posted by BillL View Post
You don't have to have one, but is there a technical reason you desire a plenum (cover)?
I flew without the plenum for many years but looking out at the cowling bulging from the internal pressure. Couldnít stop thinking about the pressure on the sky bolt fasteners, couldnít take my eyes off the ďscallopingĒ between the fasteners. I have never heard of a cowl failure but the sight bothered me. So, I build myself a plenum, it was crude, not pretty but got the pressure off the cowl. Surprisingly, it did not improve cooling (which had always been fine) at all.

Now, I am going through my plane and fixing/improving all the little things I am not 100% happy with before I retire and donít want to put money into it. New panel, repairing/replacing all the fiberglass parts...

Interestingly, after converting from steam gauges and a VM-1000 engine monitor to a G3X, my CHTs have all gone up 30-40degrees with no other changes! Canít fingure this out, Garmin doesnít want to hear about it even though I have heard the same from a couple others. So, a better plenum, cleanup under the cowl and see what I get.

Scott
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  #7  
Old 04-28-2018, 04:13 PM
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cdeerinck cdeerinck is offline
 
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Location: San Marcos, CA
Posts: 300
Default Still available.

NJ33JJ - FYI, I reached out to RVBits, and while they don't list the plenum on their website anymore, they will still make them. But the shipping from South Africa is expensive (about $300). They are doing a Carbon Fibre one for me now.

I also have a nearby neighbor that has one he was going to put on a different type of aircraft, but that plan didn't work out, so he might be interested in selling it. Let me know if you are interested.
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QB RV-8 -- Working on the canopy and wiring
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  #8  
Old 04-28-2018, 04:50 PM
N733JJ N733JJ is offline
 
Join Date: Jan 2005
Location: Wappingers Falls, NY
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Quote:
Originally Posted by cdeerinck View Post
NJ33JJ - FYI, I reached out to RVBits, and while they don't list the plenum on their website anymore, they will still make them. But the shipping from South Africa is expensive (about $300). They are doing a Carbon Fibre one for me now.

I also have a nearby neighbor that has one he was going to put on a different type of aircraft, but that plan didn't work out, so he might be interested in selling it. Let me know if you are interested.
Chuck,
I would be interested in your buddies plenum if it would fit without a lot of work. Another option might be to get a carbon fiber like you, have them shipped to the U.S. together, might save some on shipping. What is the price of the CF one? I assume this is Johansson?

Scott
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  #9  
Old 04-28-2018, 04:59 PM
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cdeerinck cdeerinck is offline
 
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Location: San Marcos, CA
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Scott - I am in San Diego, and you are New York, so I don't know if the "split shipping" idea would work. Bummer, because it sounded like a great idea.

Chris said he is sending me the full quote, so I will let you know what that comes back at. I am getting a full set of Intersection Fairings as well.

My buddies plenum was for an RV-8 originally, and it came from RVBits, so if yours is an 8, that is what it was made for.
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DG-800S Sailplane
QB RV-8 -- Working on the canopy and wiring
84CX Reserved
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  #10  
Old 04-28-2018, 05:58 PM
cardinalflier cardinalflier is offline
 
Join Date: Jul 2015
Location: Granite Bay, Ca
Posts: 82
Default Plenum

Chuck: I am in Northern Ca. And would be interested in a plenum for my RV6 and would like to explore the split shipping. Please let me know what you find out. Thanks, Bruce Estes
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