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grantn
Joined: 04 Nov 2006
Posts: 11
Location: Campbell River, B.C. Canada
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 Posted: Thu Feb 28, 2008 1:43 pm Post subject: Carb heat in the 9A |
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I see nowhere in the plans indicating that warmed air should be routed via a SCAT tube directly to the hole made in the top plate of the filtered air box. Is the radiant heat from the adjacent exhaust pipe in the low pressure area of the cowling sufficient for carb heat or should I be directing some air to the opening in the filtered air box with a heat muff / SCAT tube?
Thanks for any input.
Grant Neilson, RV9A finishing
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mrobert569(at)hotmail.com
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| Posted: Thu Feb 28, 2008 2:15 pm Post subject: Carb heat in the 9A |
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There is a small heat muff that goes around the crossover tube right above the airbox that is connected to the airbox but a short section of scat tube. I don't remember which drawing it is in but it does come with the firewall forward kit, if you have it.
Mike Robertson
From: grantneilson(at)telus.net
To: rv-list(at)matronics.com
Subject: RV-List: Carb heat in the 9A
Date: Thu, 28 Feb 2008 13:38:51 -0800
.ExternalClass {font-size:10pt;margin-left:30px;color:#333399;font-family:Trebuchet MS, Verdana;} .ExternalClass IMG {margin-left:-30px;} | Quote: | I see nowhere in the plans indicating that warmed air should be routed via a SCAT tube directly to the hole made in the top plate of the filtered air box. Is the radiant heat from the adjacent exhaust pipe in the low pressure area of the cowling sufficient for carb heat or should I be directing some air to the opening in the filtered air box with a heat muff / SCAT tube?
Thanks for any input.
Grant Neilson, RV9A finishing
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hooverra(at)verizon.net
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n616tb(at)btsapps.com
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| Posted: Fri Feb 29, 2008 10:57 am Post subject: Carb heat in the 9A |
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It does seem effective in flight as there is a rpm drop when applied. Mine
doesn't make any difference on the ground when doing a run up. I wouldn't
hesitate to use it as shown.
Tim
[quote] --
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bicyclop(at)pacbell.net
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| Posted: Fri Feb 29, 2008 11:00 am Post subject: Carb heat in the 9A |
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I installed one of these on our 6A and was not impressed. We got maybe
10 rpm drop. We changed it out to about a 10" long muff fitted over on
of the crossover pipes and got much better results. That said, I've
never needed carb heat on our O-320, although I do use a little bit when
aggressively leaning to aid with atomization.
Pax,
Ed Holyoke
Ralph Hoover wrote:
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kahamer(at)bigpond.net.au
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| Posted: Fri Feb 29, 2008 4:57 pm Post subject: Carb heat in the 9A |
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Hi all
I had one from Vans initially in my 6A and the rpm drop was very
small.Changed over to one made by Robins Wings and got 100rpm drop.
Karl/Sydney Australia
7A first flight maybe this Sunday!!!
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bobbyhester(at)newwavecom
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