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  #11  
Old 11-04-2007, 11:32 AM
Paul Eckenroth Paul Eckenroth is offline
 
Join Date: Apr 2005
Posts: 102
Default Dual mufflers in a 9A

I installed Aircraft Exhaust muffler system (Vetterman did not have mufflers at the time) in my 9A with O-320. The air is routed from the front ramps (left and right) back to the muffler shroud and then to two heat valves through the firewall.

The amount of cabin heat available is outstanding. So far I have only had to partially open one valve to get all the heat I needed with 15F OAT. I doubt if I'll ever need both valves open for cabin heat. That said I think it makes sense to plumb one muffler with a scat tube to the cowl exit rather than go to the expense and effort of fitting two heat valves.

At one time I covered up both ramp intakes to see if that would help with CHT temps and noticed no change so I don't believe the ramp openings are robbing cooling air from the engine.

Paul Eckenroth
N509RV
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  #12  
Old 11-04-2007, 12:56 PM
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pgroell pgroell is offline
 
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Location: Croissy-Beaubourg, France
Posts: 224
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Thanks Paul,
would you have any picture of your install, I'm interested in the position of the two heat boxes
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  #13  
Old 11-04-2007, 06:08 PM
Paul Eckenroth Paul Eckenroth is offline
 
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Pascal

I do not have pictures of that area. The boxes were installed side by side with the two sharing the center attachment bolt. The fit was very tight but worked well with some minor trimming of the flanges. I used the SS boxes so adding the second box was $$$. I really like the mufflers as they reduce the noise significantly. They also lessen the vibration through the floor from the exhaust pulses. However if doing again, I would use only one heat valve and route the hot air from the other muffler to the cowl exhaust.

Paul Eckenroth
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  #14  
Old 11-05-2007, 01:57 AM
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pgroell pgroell is offline
 
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Location: Croissy-Beaubourg, France
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Thanks Paul, I'll have a look at all that when doing the firewall forward.
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  #15  
Old 10-05-2009, 06:45 PM
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IowaRV9Dreamer IowaRV9Dreamer is offline
 
Join Date: Jan 2005
Location: Marion IA
Posts: 1,095
Default Any updates on dual muffler installations?

I'm planning on dual Vetterman mufflers for my 9A. I'd like to put the firewall heat box on now, and wondering if I need 1 or 2 box4es

I talked to Larry today and he told me that you cannot plumb twomufflers in series, but in parallel might be OK... 2 mufflers feeding 1 heat box. Has anyone done this?

Another option might be to remove the shroud around one of them. Is anyone operating that way?

I'd love to see some pictures of a 7A or 9A with dual mufflers.

thanks for any info,
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Building RV-9A N149DG (slider, IO-320, IFR)
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There is no sport equal to that which aviators enjoy while being carried through the air on great white wings." Wilbur Wright, 1905
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  #16  
Old 10-05-2009, 08:54 PM
Dan B Dan B is offline
 
Join Date: Mar 2006
Location: Edmond, OK
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I have the Vetterman mufflers on my IO-320 9A. I "Y"ed off the duct from the right baffle to both mufflers, then "Y"ed back together just prior to the cabin heat valve. Spruce sells the "Y" parts for the duct.
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  #17  
Old 10-05-2009, 10:16 PM
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IowaRV9Dreamer IowaRV9Dreamer is offline
 
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Location: Marion IA
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Thanks Dan - how well does it work in cold temps (nothing crazy cold... 0F is my minimum)
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Building RV-9A N149DG (slider, IO-320, IFR)
Restored and Flying Beech Super III N3698Q
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Struggling with fiberglass

There is no sport equal to that which aviators enjoy while being carried through the air on great white wings." Wilbur Wright, 1905
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  #18  
Old 10-06-2009, 12:23 AM
Pilottonny Pilottonny is offline
 
Join Date: Jan 2006
Location: Belgium
Posts: 645
Default Mufflers give more heat than ordinary shrouds!

According to Larry, the heat from the mufflers is superior to the heat from a normal shroud. So there should be no need for using the heat from both mufflers for cabin heat. The mufflers need cooling though, unless you take the "shroud" off. I use the RH muffler for cabin heat (like the original setup).

Since the shroud is a good heat shield, so close to the throtle body and fuel lines, I left the LH one on as well and have a 2" tube from the baffles just underneath the oil cooler on it, for cooling it. No need for an "exit" hose, it just blows inside the cowl (without the shroud on, that heat would be there anyway). There will be not much air going through it (and maybe even already a bit warm from the cylinder), but it should be enough to keep the muffler from getting red-hot.

I may have some puctures, If I find them, I will post them later.

Regards, Tonny.
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  #19  
Old 06-08-2013, 11:24 PM
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bruceh bruceh is offline
 
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,370
Default

Time to revive this thread, now that I'm trying to get the hoses connected up to my dual muffler system.

So what is the current concensus?
Two intakes - one from the rear baffle to the right muffler and then to the cabin heater, the other from another inlet on the inlet ramp to the left muffler and no hose on the outlet of the muffler?

One intake - Y'ed or Tee'd to both mufflers. One side to the cabin heat, or both coming back together for cabin heat?

I sent email to vetterman but haven't heard back anything in over a week.
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  #20  
Old 06-09-2013, 12:36 AM
BruceP BruceP is offline
 
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Location: Bakersfield, CA
Posts: 214
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I have the Vetterman exhaust with mufflers as well, and based on the fact that my area is pretty mild all winter long and i dont plan to fly north during the winter, I have decided just to use one intake and one heat muff to the cabin heat. I have removed the left side outer sleeve and can always put it on later if I decide to fly in colder weather more often. I'm told that one side should be enough to keep me warm most of the time.
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