Today's Message Index:
----------------------
1. 03:38 AM - Re: Firewall foreward cooling air needs (Dale Ensing)
2. 04:36 AM - Re: Firewall foreward cooling air needs (Ralph E. Capen)
3. 04:40 AM - Re: Firewall foreward cooling air needs (Ralph E. Capen)
4. 06:25 AM - Re: Firewall foreward cooling air needs (Michael T. Ice)
5. 07:16 AM - Re: Firewall foreward cooling air needs (Ralph E. Capen)
Message 1
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| Subject: | Re: Firewall foreward cooling air needs |
FWIW if I am understanding correctly..... The heat muffs are really not
like a muffler internally. There are no baffles. I have two heat muffs in
tantum on my RV-6A to maximize heat which has worked very well now for three
years. I don't think using preheated air is a problem.
Dale Ensing
----- Original Message -----
From: "Michael T. Ice" <aurbo@ak.net>
Sent: Monday, February 25, 2008 11:19 PM
Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
> <aurbo@ak.net>
>
> Ralph,
>
> Hmm! Perhaps I am not quite understanding this but don't you want the heat
> muffs to be hot. From what I have heard getting any heat into an RV (I
> don't know what your building) is hard enough to do.
>
> I am glad you like your decision with the James cowl and plenum. A friend
> with an RV-9A went the same route as you and is very happy with the set
> up.
>
> Not much activity on this message group. You might have better luck on
> Van's Air Force web site, http://www.vansairforce.net/. There is always
> lots going on that site, check out this link,
> http://www.vansairforce.com/community/search.php?searchid=3368738,
>
> Good luck, keep building,
>
> Mike
> ----- Original Message -----
> From: "Ralph E. Capen" <recapen@earthlink.net>
> To: <lycomingengines-list@matronics.com>
> Sent: Monday, February 25, 2008 6:20 AM
> Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>
>
>> <recapen@earthlink.net>
>>
>> Mike,
>>
>> The way I understand it is in order to get a decent heat exchange, the
>> heater box metal is slightly thinner - coupled with the fact that it is a
>> muffler internally means that it will get pretty hot. This also
>> eliminates using preheated air as an option.
>>
>> I really like the Sam James cowl. I am still installing the plenum -
>> it's not fitting nearly as well as the cowl.....too wide in the front,
>> too short in the back. I started with Vans baffle kit - but that doesn't
>> account for the variances - I was able to adapt the inlet ramps to the
>> plenum intakes though....but it took a bunch of work.
>>
>> Ralph
>>
>> -----Original Message-----
>>>From: "Michael T. Ice" <aurbo@ak.net>
>>>Sent: Feb 25, 2008 9:45 AM
>>>To: lycomingengines-list@matronics.com
>>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>>>
>>><aurbo@ak.net>
>>>
>>>Ralph,
>>>
>>>I did not know that the heat muffs required cooling air flowing over
>>>(through?) them at all times. Why is that?
>>>
>>>I just installed my carb heat yesterday and I used another one of Van's
>>>heat
>>>muffs instead of the standard issue carb heat gizmo. I elected to get the
>>>carb heat air from inside the cowl instead of cutting another hole for it
>>>in
>>>the air inlet ramp. That is the way Cessna and the standard Van's carb
>>>heat
>>>muff does it and it seems to work just fine.
>>>
>>>For the air supply to the heat muff for cabin air I went even lower and
>>>took
>>>the air from the plate right next to the cylinder fins. I and others have
>>>thought this is a good place because the air will be pre-warmed as much
>>>as
>>>possible.
>>>
>>>How do you like that Sam James cowl?
>>>
>>>I had a tough time getting my Van's standard issue cowl to fit.
>>>
>>>Mike Ice
>>>RV-9
>>>firewall forward
>>>----- Original Message -----
>>>From: "Ralph E. Capen" <recapen@earthlink.net>
>>>To: "rv-list" <rv-list@matronics.com>; "lycoming engine list"
>>><lycomingengines-list@matronics.com>
>>>Sent: Monday, February 25, 2008 4:58 AM
>>>Subject: LycomingEngines-List: Firewall foreward cooling air needs
>>>
>>>
>>>> <recapen@earthlink.net>
>>>>
>>>> Here's the setup:
>>>>
>>>> IO360B1F6 with CS MT prop, AFP injection, LASAR ignition, Vetterman
>>>> crossover heater/mufflers in a SamJames cowled/plenum'd RV6A.
>>>>
>>>> I'm planning on putting the oil cooler behind the #4 cylinder with its
>>>> cutout for airflow feeding the oil cooler.
>>>>
>>>> My heater/mufflers require cooling air over them even when they're not
>>>> heating the cockpit according to Larry.
>>>>
>>>> I'm thinking that taking the cooling air for both heater/mufflers from
>>>> the
>>>> back plate behind the #2 cylinder should be OK - since I'm taking a
>>>> chunk
>>>> from each side.
>>>>
>>>> Is this a valid thought? - or does it not matter since I have a plenum.
>>>> For the cabin heat air, would it be better to take the air from the
>>>> vertical plate or the 40 degree angled plate below it?
>>>>
>>>> Thanks,
>>>> Ralph
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
Message 2
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| Subject: | Re: Firewall foreward cooling air needs |
Dale,
I'm just going with what Larry Vetterman told me 'constant individual cooling air'.
They may or may not have baffles - but now I'm gonna look.
Ralph
-----Original Message-----
>From: Dale Ensing <densing@carolina.rr.com>
>Sent: Feb 26, 2008 6:35 AM
>To: lycomingengines-list@matronics.com
>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>
>
>FWIW if I am understanding correctly..... The heat muffs are really not
>like a muffler internally. There are no baffles. I have two heat muffs in
>tantum on my RV-6A to maximize heat which has worked very well now for three
>years. I don't think using preheated air is a problem.
>Dale Ensing
>
>----- Original Message -----
>From: "Michael T. Ice" <aurbo@ak.net>
>To: <lycomingengines-list@matronics.com>
>Sent: Monday, February 25, 2008 11:19 PM
>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>
>
>> <aurbo@ak.net>
>>
>> Ralph,
>>
>> Hmm! Perhaps I am not quite understanding this but don't you want the heat
>> muffs to be hot. From what I have heard getting any heat into an RV (I
>> don't know what your building) is hard enough to do.
>>
>> I am glad you like your decision with the James cowl and plenum. A friend
>> with an RV-9A went the same route as you and is very happy with the set
>> up.
>>
>> Not much activity on this message group. You might have better luck on
>> Van's Air Force web site, http://www.vansairforce.net/. There is always
>> lots going on that site, check out this link,
>> http://www.vansairforce.com/community/search.php?searchid=3368738,
>>
>> Good luck, keep building,
>>
>> Mike
>> ----- Original Message -----
>> From: "Ralph E. Capen" <recapen@earthlink.net>
>> To: <lycomingengines-list@matronics.com>
>> Sent: Monday, February 25, 2008 6:20 AM
>> Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>>
>>
>>> <recapen@earthlink.net>
>>>
>>> Mike,
>>>
>>> The way I understand it is in order to get a decent heat exchange, the
>>> heater box metal is slightly thinner - coupled with the fact that it is a
>>> muffler internally means that it will get pretty hot. This also
>>> eliminates using preheated air as an option.
>>>
>>> I really like the Sam James cowl. I am still installing the plenum -
>>> it's not fitting nearly as well as the cowl.....too wide in the front,
>>> too short in the back. I started with Vans baffle kit - but that doesn't
>>> account for the variances - I was able to adapt the inlet ramps to the
>>> plenum intakes though....but it took a bunch of work.
>>>
>>> Ralph
>>>
>>> -----Original Message-----
>>>>From: "Michael T. Ice" <aurbo@ak.net>
>>>>Sent: Feb 25, 2008 9:45 AM
>>>>To: lycomingengines-list@matronics.com
>>>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>>>>
>>>><aurbo@ak.net>
>>>>
>>>>Ralph,
>>>>
>>>>I did not know that the heat muffs required cooling air flowing over
>>>>(through?) them at all times. Why is that?
>>>>
>>>>I just installed my carb heat yesterday and I used another one of Van's
>>>>heat
>>>>muffs instead of the standard issue carb heat gizmo. I elected to get the
>>>>carb heat air from inside the cowl instead of cutting another hole for it
>>>>in
>>>>the air inlet ramp. That is the way Cessna and the standard Van's carb
>>>>heat
>>>>muff does it and it seems to work just fine.
>>>>
>>>>For the air supply to the heat muff for cabin air I went even lower and
>>>>took
>>>>the air from the plate right next to the cylinder fins. I and others have
>>>>thought this is a good place because the air will be pre-warmed as much
>>>>as
>>>>possible.
>>>>
>>>>How do you like that Sam James cowl?
>>>>
>>>>I had a tough time getting my Van's standard issue cowl to fit.
>>>>
>>>>Mike Ice
>>>>RV-9
>>>>firewall forward
>>>>----- Original Message -----
>>>>From: "Ralph E. Capen" <recapen@earthlink.net>
>>>>To: "rv-list" <rv-list@matronics.com>; "lycoming engine list"
>>>><lycomingengines-list@matronics.com>
>>>>Sent: Monday, February 25, 2008 4:58 AM
>>>>Subject: LycomingEngines-List: Firewall foreward cooling air needs
>>>>
>>>>
>>>>> <recapen@earthlink.net>
>>>>>
>>>>> Here's the setup:
>>>>>
>>>>> IO360B1F6 with CS MT prop, AFP injection, LASAR ignition, Vetterman
>>>>> crossover heater/mufflers in a SamJames cowled/plenum'd RV6A.
>>>>>
>>>>> I'm planning on putting the oil cooler behind the #4 cylinder with its
>>>>> cutout for airflow feeding the oil cooler.
>>>>>
>>>>> My heater/mufflers require cooling air over them even when they're not
>>>>> heating the cockpit according to Larry.
>>>>>
>>>>> I'm thinking that taking the cooling air for both heater/mufflers from
>>>>> the
>>>>> back plate behind the #2 cylinder should be OK - since I'm taking a
>>>>> chunk
>>>>> from each side.
>>>>>
>>>>> Is this a valid thought? - or does it not matter since I have a plenum.
>>>>> For the cabin heat air, would it be better to take the air from the
>>>>> vertical plate or the 40 degree angled plate below it?
>>>>>
>>>>> Thanks,
>>>>> Ralph
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>
>
Message 3
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|
| Subject: | Re: Firewall foreward cooling air needs |
I actually do want them hot. I'm just going with what Larry Vetterman provided
me - 'constant individual cooling air'.
If I don't get enough heat, I'll consider the SS Scrubbies or a wire wrap coil.
It's an older (small-tail) 6A.
I'll check out Doug's area.....
-----Original Message-----
>From: "Michael T. Ice" <aurbo@ak.net>
>Sent: Feb 25, 2008 11:19 PM
>To: lycomingengines-list@matronics.com
>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>
>
>Ralph,
>
>Hmm! Perhaps I am not quite understanding this but don't you want the heat
>muffs to be hot. From what I have heard getting any heat into an RV (I don't
>know what your building) is hard enough to do.
>
>I am glad you like your decision with the James cowl and plenum. A friend
>with an RV-9A went the same route as you and is very happy with the set up.
>
>Not much activity on this message group. You might have better luck on Van's
>Air Force web site, http://www.vansairforce.net/. There is always lots going
>on that site, check out this link,
>http://www.vansairforce.com/community/search.php?searchid=3368738,
>
>Good luck, keep building,
>
>Mike
>----- Original Message -----
>From: "Ralph E. Capen" <recapen@earthlink.net>
>To: <lycomingengines-list@matronics.com>
>Sent: Monday, February 25, 2008 6:20 AM
>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>
>
>> <recapen@earthlink.net>
>>
>> Mike,
>>
>> The way I understand it is in order to get a decent heat exchange, the
>> heater box metal is slightly thinner - coupled with the fact that it is a
>> muffler internally means that it will get pretty hot. This also
>> eliminates using preheated air as an option.
>>
>> I really like the Sam James cowl. I am still installing the plenum - it's
>> not fitting nearly as well as the cowl.....too wide in the front, too
>> short in the back. I started with Vans baffle kit - but that doesn't
>> account for the variances - I was able to adapt the inlet ramps to the
>> plenum intakes though....but it took a bunch of work.
>>
>> Ralph
>>
>> -----Original Message-----
>>>From: "Michael T. Ice" <aurbo@ak.net>
>>>Sent: Feb 25, 2008 9:45 AM
>>>To: lycomingengines-list@matronics.com
>>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>>>
>>><aurbo@ak.net>
>>>
>>>Ralph,
>>>
>>>I did not know that the heat muffs required cooling air flowing over
>>>(through?) them at all times. Why is that?
>>>
>>>I just installed my carb heat yesterday and I used another one of Van's
>>>heat
>>>muffs instead of the standard issue carb heat gizmo. I elected to get the
>>>carb heat air from inside the cowl instead of cutting another hole for it
>>>in
>>>the air inlet ramp. That is the way Cessna and the standard Van's carb
>>>heat
>>>muff does it and it seems to work just fine.
>>>
>>>For the air supply to the heat muff for cabin air I went even lower and
>>>took
>>>the air from the plate right next to the cylinder fins. I and others have
>>>thought this is a good place because the air will be pre-warmed as much as
>>>possible.
>>>
>>>How do you like that Sam James cowl?
>>>
>>>I had a tough time getting my Van's standard issue cowl to fit.
>>>
>>>Mike Ice
>>>RV-9
>>>firewall forward
>>>----- Original Message -----
>>>From: "Ralph E. Capen" <recapen@earthlink.net>
>>>To: "rv-list" <rv-list@matronics.com>; "lycoming engine list"
>>><lycomingengines-list@matronics.com>
>>>Sent: Monday, February 25, 2008 4:58 AM
>>>Subject: LycomingEngines-List: Firewall foreward cooling air needs
>>>
>>>
>>>> <recapen@earthlink.net>
>>>>
>>>> Here's the setup:
>>>>
>>>> IO360B1F6 with CS MT prop, AFP injection, LASAR ignition, Vetterman
>>>> crossover heater/mufflers in a SamJames cowled/plenum'd RV6A.
>>>>
>>>> I'm planning on putting the oil cooler behind the #4 cylinder with its
>>>> cutout for airflow feeding the oil cooler.
>>>>
>>>> My heater/mufflers require cooling air over them even when they're not
>>>> heating the cockpit according to Larry.
>>>>
>>>> I'm thinking that taking the cooling air for both heater/mufflers from
>>>> the
>>>> back plate behind the #2 cylinder should be OK - since I'm taking a
>>>> chunk
>>>> from each side.
>>>>
>>>> Is this a valid thought? - or does it not matter since I have a plenum.
>>>> For the cabin heat air, would it be better to take the air from the
>>>> vertical plate or the 40 degree angled plate below it?
>>>>
>>>> Thanks,
>>>> Ralph
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 4
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|
| Subject: | Re: Firewall foreward cooling air needs |
Ralph,
I agree with Dale. I just installed two of those Van's type heat muffs and
they did not have any internal baffles. The outlet air does have a plate in
it with a bunch of small holes punched in it. I suppose that is to slow the
air down a little so it will have a chance to get warm.
I have heard that it is best to install the muff with the inlet air the
farthest down on the pipe and the outlet air up. I guess because heated air
rises, Maybe??
I installed two power port outlets (cigarette lighters) in the airplane so
the wife and I can wear electrically heated vests. I want to be warm and I
have never been too impressed with aircraft heaters. Even in the summer it
gets cold in Alaska especially at altitude.
Mike
----- Original Message -----
From: "Ralph E. Capen" <recapen@earthlink.net>
Sent: Tuesday, February 26, 2008 3:35 AM
Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
> <recapen@earthlink.net>
>
> I actually do want them hot. I'm just going with what Larry Vetterman
> provided me - 'constant individual cooling air'.
> If I don't get enough heat, I'll consider the SS Scrubbies or a wire wrap
> coil.
>
> It's an older (small-tail) 6A.
>
> I'll check out Doug's area.....
>
> -----Original Message-----
>>From: "Michael T. Ice" <aurbo@ak.net>
>>Sent: Feb 25, 2008 11:19 PM
>>To: lycomingengines-list@matronics.com
>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>>
>><aurbo@ak.net>
>>
>>Ralph,
>>
>>Hmm! Perhaps I am not quite understanding this but don't you want the heat
>>muffs to be hot. From what I have heard getting any heat into an RV (I
>>don't
>>know what your building) is hard enough to do.
>>
>>I am glad you like your decision with the James cowl and plenum. A friend
>>with an RV-9A went the same route as you and is very happy with the set
>>up.
>>
>>Not much activity on this message group. You might have better luck on
>>Van's
>>Air Force web site, http://www.vansairforce.net/. There is always lots
>>going
>>on that site, check out this link,
>>http://www.vansairforce.com/community/search.php?searchid=3368738,
>>
>>Good luck, keep building,
>>
>>Mike
>>----- Original Message -----
>>From: "Ralph E. Capen" <recapen@earthlink.net>
>>To: <lycomingengines-list@matronics.com>
>>Sent: Monday, February 25, 2008 6:20 AM
>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>>
>>
>>> <recapen@earthlink.net>
>>>
>>> Mike,
>>>
>>> The way I understand it is in order to get a decent heat exchange, the
>>> heater box metal is slightly thinner - coupled with the fact that it is
>>> a
>>> muffler internally means that it will get pretty hot. This also
>>> eliminates using preheated air as an option.
>>>
>>> I really like the Sam James cowl. I am still installing the plenum -
>>> it's
>>> not fitting nearly as well as the cowl.....too wide in the front, too
>>> short in the back. I started with Vans baffle kit - but that doesn't
>>> account for the variances - I was able to adapt the inlet ramps to the
>>> plenum intakes though....but it took a bunch of work.
>>>
>>> Ralph
>>>
>>> -----Original Message-----
>>>>From: "Michael T. Ice" <aurbo@ak.net>
>>>>Sent: Feb 25, 2008 9:45 AM
>>>>To: lycomingengines-list@matronics.com
>>>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>>>>
>>>><aurbo@ak.net>
>>>>
>>>>Ralph,
>>>>
>>>>I did not know that the heat muffs required cooling air flowing over
>>>>(through?) them at all times. Why is that?
>>>>
>>>>I just installed my carb heat yesterday and I used another one of Van's
>>>>heat
>>>>muffs instead of the standard issue carb heat gizmo. I elected to get
>>>>the
>>>>carb heat air from inside the cowl instead of cutting another hole for
>>>>it
>>>>in
>>>>the air inlet ramp. That is the way Cessna and the standard Van's carb
>>>>heat
>>>>muff does it and it seems to work just fine.
>>>>
>>>>For the air supply to the heat muff for cabin air I went even lower and
>>>>took
>>>>the air from the plate right next to the cylinder fins. I and others
>>>>have
>>>>thought this is a good place because the air will be pre-warmed as much
>>>>as
>>>>possible.
>>>>
>>>>How do you like that Sam James cowl?
>>>>
>>>>I had a tough time getting my Van's standard issue cowl to fit.
>>>>
>>>>Mike Ice
>>>>RV-9
>>>>firewall forward
>>>>----- Original Message -----
>>>>From: "Ralph E. Capen" <recapen@earthlink.net>
>>>>To: "rv-list" <rv-list@matronics.com>; "lycoming engine list"
>>>><lycomingengines-list@matronics.com>
>>>>Sent: Monday, February 25, 2008 4:58 AM
>>>>Subject: LycomingEngines-List: Firewall foreward cooling air needs
>>>>
>>>>
>>>>> <recapen@earthlink.net>
>>>>>
>>>>> Here's the setup:
>>>>>
>>>>> IO360B1F6 with CS MT prop, AFP injection, LASAR ignition, Vetterman
>>>>> crossover heater/mufflers in a SamJames cowled/plenum'd RV6A.
>>>>>
>>>>> I'm planning on putting the oil cooler behind the #4 cylinder with its
>>>>> cutout for airflow feeding the oil cooler.
>>>>>
>>>>> My heater/mufflers require cooling air over them even when they're not
>>>>> heating the cockpit according to Larry.
>>>>>
>>>>> I'm thinking that taking the cooling air for both heater/mufflers from
>>>>> the
>>>>> back plate behind the #2 cylinder should be OK - since I'm taking a
>>>>> chunk
>>>>> from each side.
>>>>>
>>>>> Is this a valid thought? - or does it not matter since I have a
>>>>> plenum.
>>>>> For the cabin heat air, would it be better to take the air from the
>>>>> vertical plate or the 40 degree angled plate below it?
>>>>>
>>>>> Thanks,
>>>>> Ralph
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
>
Message 5
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|
| Subject: | Re: Firewall foreward cooling air needs |
Mike,
Thanks for your response.
My heater/mufflers are made by Aircraft Exhaust Technologies for Larry Vetterman's
systems. When they're not heating the cabin, the heated air flows out the
valve dump. The requirement is that they always have to have air flowing over
them and they can't be run in series. I've read that they do provide plenty
of heat.
Sorry for the confusion - I think I will be OK with the setup.
Ralph
-----Original Message-----
>From: "Michael T. Ice" <aurbo@ak.net>
>Sent: Feb 26, 2008 9:22 AM
>To: lycomingengines-list@matronics.com
>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>
>
>Ralph,
>
>I agree with Dale. I just installed two of those Van's type heat muffs and
>they did not have any internal baffles. The outlet air does have a plate in
>it with a bunch of small holes punched in it. I suppose that is to slow the
>air down a little so it will have a chance to get warm.
>
>I have heard that it is best to install the muff with the inlet air the
>farthest down on the pipe and the outlet air up. I guess because heated air
>rises, Maybe??
>
>I installed two power port outlets (cigarette lighters) in the airplane so
>the wife and I can wear electrically heated vests. I want to be warm and I
>have never been too impressed with aircraft heaters. Even in the summer it
>gets cold in Alaska especially at altitude.
>
>Mike
>
>----- Original Message -----
>From: "Ralph E. Capen" <recapen@earthlink.net>
>To: <lycomingengines-list@matronics.com>
>Sent: Tuesday, February 26, 2008 3:35 AM
>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>
>
>> <recapen@earthlink.net>
>>
>> I actually do want them hot. I'm just going with what Larry Vetterman
>> provided me - 'constant individual cooling air'.
>> If I don't get enough heat, I'll consider the SS Scrubbies or a wire wrap
>> coil.
>>
>> It's an older (small-tail) 6A.
>>
>> I'll check out Doug's area.....
>>
>> -----Original Message-----
>>>From: "Michael T. Ice" <aurbo@ak.net>
>>>Sent: Feb 25, 2008 11:19 PM
>>>To: lycomingengines-list@matronics.com
>>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>>>
>>><aurbo@ak.net>
>>>
>>>Ralph,
>>>
>>>Hmm! Perhaps I am not quite understanding this but don't you want the heat
>>>muffs to be hot. From what I have heard getting any heat into an RV (I
>>>don't
>>>know what your building) is hard enough to do.
>>>
>>>I am glad you like your decision with the James cowl and plenum. A friend
>>>with an RV-9A went the same route as you and is very happy with the set
>>>up.
>>>
>>>Not much activity on this message group. You might have better luck on
>>>Van's
>>>Air Force web site, http://www.vansairforce.net/. There is always lots
>>>going
>>>on that site, check out this link,
>>>http://www.vansairforce.com/community/search.php?searchid=3368738,
>>>
>>>Good luck, keep building,
>>>
>>>Mike
>>>----- Original Message -----
>>>From: "Ralph E. Capen" <recapen@earthlink.net>
>>>To: <lycomingengines-list@matronics.com>
>>>Sent: Monday, February 25, 2008 6:20 AM
>>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>>>
>>>
>>>> <recapen@earthlink.net>
>>>>
>>>> Mike,
>>>>
>>>> The way I understand it is in order to get a decent heat exchange, the
>>>> heater box metal is slightly thinner - coupled with the fact that it is
>>>> a
>>>> muffler internally means that it will get pretty hot. This also
>>>> eliminates using preheated air as an option.
>>>>
>>>> I really like the Sam James cowl. I am still installing the plenum -
>>>> it's
>>>> not fitting nearly as well as the cowl.....too wide in the front, too
>>>> short in the back. I started with Vans baffle kit - but that doesn't
>>>> account for the variances - I was able to adapt the inlet ramps to the
>>>> plenum intakes though....but it took a bunch of work.
>>>>
>>>> Ralph
>>>>
>>>> -----Original Message-----
>>>>>From: "Michael T. Ice" <aurbo@ak.net>
>>>>>Sent: Feb 25, 2008 9:45 AM
>>>>>To: lycomingengines-list@matronics.com
>>>>>Subject: Re: LycomingEngines-List: Firewall foreward cooling air needs
>>>>>
>>>>><aurbo@ak.net>
>>>>>
>>>>>Ralph,
>>>>>
>>>>>I did not know that the heat muffs required cooling air flowing over
>>>>>(through?) them at all times. Why is that?
>>>>>
>>>>>I just installed my carb heat yesterday and I used another one of Van's
>>>>>heat
>>>>>muffs instead of the standard issue carb heat gizmo. I elected to get
>>>>>the
>>>>>carb heat air from inside the cowl instead of cutting another hole for
>>>>>it
>>>>>in
>>>>>the air inlet ramp. That is the way Cessna and the standard Van's carb
>>>>>heat
>>>>>muff does it and it seems to work just fine.
>>>>>
>>>>>For the air supply to the heat muff for cabin air I went even lower and
>>>>>took
>>>>>the air from the plate right next to the cylinder fins. I and others
>>>>>have
>>>>>thought this is a good place because the air will be pre-warmed as much
>>>>>as
>>>>>possible.
>>>>>
>>>>>How do you like that Sam James cowl?
>>>>>
>>>>>I had a tough time getting my Van's standard issue cowl to fit.
>>>>>
>>>>>Mike Ice
>>>>>RV-9
>>>>>firewall forward
>>>>>----- Original Message -----
>>>>>From: "Ralph E. Capen" <recapen@earthlink.net>
>>>>>To: "rv-list" <rv-list@matronics.com>; "lycoming engine list"
>>>>><lycomingengines-list@matronics.com>
>>>>>Sent: Monday, February 25, 2008 4:58 AM
>>>>>Subject: LycomingEngines-List: Firewall foreward cooling air needs
>>>>>
>>>>>
>>>>>> <recapen@earthlink.net>
>>>>>>
>>>>>> Here's the setup:
>>>>>>
>>>>>> IO360B1F6 with CS MT prop, AFP injection, LASAR ignition, Vetterman
>>>>>> crossover heater/mufflers in a SamJames cowled/plenum'd RV6A.
>>>>>>
>>>>>> I'm planning on putting the oil cooler behind the #4 cylinder with its
>>>>>> cutout for airflow feeding the oil cooler.
>>>>>>
>>>>>> My heater/mufflers require cooling air over them even when they're not
>>>>>> heating the cockpit according to Larry.
>>>>>>
>>>>>> I'm thinking that taking the cooling air for both heater/mufflers from
>>>>>> the
>>>>>> back plate behind the #2 cylinder should be OK - since I'm taking a
>>>>>> chunk
>>>>>> from each side.
>>>>>>
>>>>>> Is this a valid thought? - or does it not matter since I have a
>>>>>> plenum.
>>>>>> For the cabin heat air, would it be better to take the air from the
>>>>>> vertical plate or the 40 degree angled plate below it?
>>>>>>
>>>>>> Thanks,
>>>>>> Ralph
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
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>>>
>>>
>>
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>>
>
>
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