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  #1  
Old 07-04-2011, 08:00 PM
Jimboscr's Avatar
Jimboscr Jimboscr is offline
 
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Default Plenum

Hi Everyone

I have been thinking about the use of a plenum for the 8. I wonder if anyone with one or knows of the use of one could share whether or not it is worthwhile, or just a waste of time and money?

I have had a couple of opinions but would like a some more before making a decision.

Thanks

Jim
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  #2  
Old 07-04-2011, 11:00 PM
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Default

Jim, a plenum lid is just a method of reducing leakage between the upper and lower cowl areas. You may be able to seal just as well with conventional rubber baffle strips. Some do it well, some do it very badly.

A plenum lid is not an easy cure for leakage. The trouble with most homemade plenum packages is the intake shape and/or sealing.
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  #3  
Old 07-05-2011, 04:39 AM
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Default Either way...

This is also another very debated item and as Dan says, many are poorly done and so offer no advantage.

Personally, I like the easier access to the injectors, fuel lines and spark plugs with conventional baffling, done right. Your rubber baffling and how the pieces are cut and fit make a big difference in cooling temps, so plan this carefully and ensure good sealing with the contours of the upper cowl area.

Best,
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  #4  
Old 11-30-2011, 01:22 AM
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Default Have you seen this

Hi Jim,
Have you seen this?
http://rvbits.mybigcommerce.com/prod...er-Plenum.html
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  #5  
Old 11-30-2011, 06:56 AM
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Quote:
Originally Posted by Janekom View Post
Hi Jim, Have you seen this?
Jan, can you post photos showing exactly how your carbon plenum is sealed to the inlets?

BTW, the notes say "Made for Lycoming IO-360 ENGINES", but that would be parallel valve only, yes? Don't think the attach method will clear the upper cowl above 2 and 4 with an angle valve motor.
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  #6  
Old 11-30-2011, 08:02 AM
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Yes it will be for the parallel valve models only.
The sealing is also discussed here
http://www.vansairforce.com/communit...ad.php?t=79268
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  #7  
Old 11-30-2011, 08:28 AM
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Quote:
Originally Posted by Janekom View Post
Sure, read that.....

I found that a gap of up to 5mm does noet matter at the inlets, but it can easily be sealed with two piese of those rubber strips that you use beow the HS. Otherwise tow strips of soft fom rubber with adhesive backing will do it.

......but I was hoping you had some detail photos. It's all in the execution. A plenum which doesn't seal (in particular at the intakes) is just expensive bling.
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  #8  
Old 11-30-2011, 10:34 AM
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Steve Ashby Steve Ashby is offline
 
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Default A question for Jan

Jan,

Do you make the RV-8 plenum in fiberglass also? If so, is it the same price as the RV-7 glass plenum?

Thanks,
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  #9  
Old 11-30-2011, 03:23 PM
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Default Hi Jim

An option for sealing a plenum to cowl inlets can be seen here.

http://www.vansairforce.com/communit...ghlight=plenum

Not quite the standard cowl exit and hasn't been flown yet but might give you some inspiration.

Clive Whittfield
Auckland
New Zealand
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  #10  
Old 12-01-2011, 05:05 AM
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Default

Dan - see the picture below. My apologies for the delay.



Steve - yes the RV8 plenum is also available in glass.
$265 plus $50 shipping.
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