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Speedy11(at)aol.com
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 Posted: Tue Apr 03, 2012 7:56 pm Post subject: RV8-List Digest: 1 Msgs - 04/02/12 |
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You didn't use a plenum?
The only James cowls I've seen on RVs use the James plenum or a custom made one.
I suppose one could use baffles, but it seems to defeat the purpose of controlling the airflow so as to reduce drag.
I assume you are referring to the transition from intake opening to the inside upper cowl surface.. You could make some ramps to smooth the airflow during transition. If fact, I think you would want to have some type of transition ramp otherwise the airflow will become very turbulent just inside the intake thus creating excessive drag and reducing cooling.
I didn't use the James cowl but I made a plenum with upper and lower ramps to direct the airflow. I also made a removable, resizeable air dam in front of #2 cylinder that is easy to adjust to change temps. You can take a look on my web site at rv-8a.net.
Stan Sutterfield
In a message dated 4/3/2012 3:02:40 A.M. Eastern Daylight Time, rv8-list(at)matronics.com writes:
| Quote: | Does anyone have photos of a Baffle system used with a James cowl? I have o
ne on my 8A (works well) but the transition could be a lot better and I am
looking for ideas.
Thanks,
Robin
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[quote][b]
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robin(at)PaintTheWeb.com
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| Posted: Tue Apr 03, 2012 8:47 pm Post subject: RV8-List Digest: 1 Msgs - 04/02/12 |
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Stan,
I am very familiar with your work good (speed) doctor!
I had a plenum on 8A. Worked fine but began to eat itself up. I have a FG plenum on my -10. Hate that one too! I am d.o.n.e with plenums.
We swapped out the plenum for a baffle system on the 8A and used the same inlets from the plenum for the new system. I am MUCH happier with this set up. Fresh out of the box I am getting great temps and speed with none of the plenum issue (mostly access). And the baffles are not closed to sealed yet. Again glad I mad the change.
My problem is that the inlets we built are all FG and they need a bit of reinforcement as one got crushed by a hose clamp and the other is a bit misaligned due the new baffles and a fresh engine. BTW the engine is and 200 Hp IO-360 and it rips!
I was looking for any ideas out of the box. I will still continue to review what's out there but I think we have decided to trim back and reinforce our units. Make a longer flex transition piece and see how that works out.
I have a similar resizable air dam system on both my RV's. Think I got the idea from you…
Thanks,
Robin
From: owner-rv8-list-server(at)matronics.com [mailto:owner-rv8-list-server(at)matronics.com] On Behalf Of Speedy11(at)aol.com
Sent: Tuesday, April 03, 2012 8:53 PM
To: rv8-list(at)matronics.com
Subject: Re: RV8-List Digest: 1 Msgs - 04/02/12
You didn't use a plenum?
The only James cowls I've seen on RVs use the James plenum or a custom made one.
I suppose one could use baffles, but it seems to defeat the purpose of controlling the airflow so as to reduce drag.
I assume you are referring to the transition from intake opening to the inside upper cowl surface.. You could make some ramps to smooth the airflow during transition. If fact, I think you would want to have some type of transition ramp otherwise the airflow will become very turbulent just inside the intake thus creating excessive drag and reducing cooling.
I didn't use the James cowl but I made a plenum with upper and lower ramps to direct the airflow. I also made a removable, resizeable air dam in front of #2 cylinder that is easy to adjust to change temps. You can take a look on my web site at rv-8a.net.
Stan Sutterfield
In a message dated 4/3/2012 3:02:40 A.M. Eastern Daylight Time, rv8-list(at)matronics.com (rv8-list(at)matronics.com) writes:
| Quote: |
Does anyone have photos of a Baffle system used with a James cowl? I have o
ne on my 8A (works well) but the transition could be a lot better and I am
looking for ideas.
Thanks,
Robin |
==============[/b][/quote] V8-List Email Forum -[/b][/quote] >[/b][/quote] :p>[/b][/quote] /o:p>[/b][/quote] tor?RV8-List">http://www.matronics.com/Navigator?RV8-List[/b][/quote] ==============[/b][/quote] bsp; - MATRONICS WEB FORUMS -[/b][/quote] :p>[/b][/quote] tp://forums.matronics.com[/b][/quote] ==============[/b][/quote] bsp; - List Contribution Web Site -[/b][/quote] e> nbsp; -Matt Dralle, List Admin.[/b][/quote] bution">http://www.matronics.com/contribution[/b][/quote] ==============[/b] [b]
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