Today's Message Index:
----------------------
1. 06:01 AM - Firewall foreward cooling air needs (Ralph E. Capen)
2. 06:48 AM - Re: Firewall foreward cooling air needs (Michael T. Ice)
3. 07:23 AM - Re: Firewall foreward cooling air needs (Ralph E. Capen)
4. 08:23 PM - Re: Firewall foreward cooling air needs (Michael T. Ice)
Message 1
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| Subject: | Firewall foreward cooling air needs |
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 |
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>
<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 |
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
>
>
>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,
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>
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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