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steve.freeman(at)syntaxds
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 Posted: Tue Mar 13, 2012 7:51 am Post subject: Baffle kit - 0235 |
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Hi guys,
I am working on installing my engine and installing a Zenair supplied baffle kit on the Lycoming 0235 engine I purchased from them. Zenair is suggesting << People typically cover the oil cooler with aluminum tape so that the air cannot go through it.>>
Can anyone explain to me why you would want do this? It seems to me that would defeat the purpose of the oil cooler or at least limit its effective ability to perform as designed. This was suggested “instead of” installing a front baffle which they claim is only for extremely cold weather flying.
I am trying to learn as much as I can and I understand that sometimes what seems obvious is the exact opposite of what reality might be. To that end, I always thought “baffling” was installed to improve air circulation around the heat dispersal fins on the cylinder heads to help cool the engine. If that is the case why would a baffle need to be added only in “cold” weather rather than hot? That seems counter intuitive to me. Also, why would you want to decrease the performance of the oil cooler.
Finally, can anyone suggest a good oil cooler and location for mounting on in an 0235 installation?
Thanks as always for any advice.
Steve
[quote][b]
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Brad(at)ocbis.com
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| Posted: Tue Mar 13, 2012 11:00 am Post subject: Baffle kit - 0235 |
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Oil can be ‘too cold’ as well as “too hot”. Cutting the airflow to the cooler by using the baffle or tape keeps the heat in the oil. A lot of aircraft have an adjustable louver to control the airflow to the cooler. To low an oil temp can cost you horsepower and not lube and cool the engine correctly. I’ve had to wait for the oil temp to come up before takeoff on cold days.
Thanks - Brad
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Steve Freeman
Sent: Tuesday, March 13, 2012 8:49 AM
To: zenith-list(at)matronics.com
Subject: Baffle kit - 0235
Hi guys,
I am working on installing my engine and installing a Zenair supplied baffle kit on the Lycoming 0235 engine I purchased from them. Zenair is suggesting << People typically cover the oil cooler with aluminum tape so that the air cannot go through it.>>
Can anyone explain to me why you would want do this? It seems to me that would defeat the purpose of the oil cooler or at least limit its effective ability to perform as designed. This was suggested “instead of” installing a front baffle which they claim is only for extremely cold weather flying.
I am trying to learn as much as I can and I understand that sometimes what seems obvious is the exact opposite of what reality might be. To that end, I always thought “baffling” was installed to improve air circulation around the heat dispersal fins on the cylinder heads to help cool the engine. If that is the case why would a baffle need to be added only in “cold” weather rather than hot? That seems counter intuitive to me. Also, why would you want to decrease the performance of the oil cooler.
Finally, can anyone suggest a good oil cooler and location for mounting on in an 0235 installation?
Thanks as always for any advice.
Steve
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Tue Mar 13, 2012 2:55 pm Post subject: Baffle kit - 0235 |
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Steve:
They are assuming that you are NOT using an oil cooler OR that you have it
remotely mounted. And if you do mount it (oil cooler) remotely don't use
tape to seal the hole. Make a good looking sheet of aluminum.
Many GA planes mount the oil cooler right on the baffle behind the #3
cylinder. Good location but not the best.
Do you have room right up front on the inlet of the cowling? Put it there
and make a small scoop to direct air DOWN and through the cooler. Take a
look at planes such as an RV6, Piper 140/160/180.
To answer your other question about air circulation: The engine and YOU
want the entire TOP of the engine SEALED OFF from any air flow that does
NOT PUSH the air DOWN from the TOP of the engine to the bottom. Putting
the oil cooler on the baffle does decrease the air flow through the engine.
As I said... A GOOD location but not GREAT!
These are AIR COOLED engines and to achieve that you NEED a
pressure deferential between the TOP of the engine and the BOTTOM. Th
bigger the pressure deferential the better the cooling.
If this is your first engine install take a look at some GA planes, 'well
kept' planes and LQQK at the effort that went into them to seal up air
leaks.
I would also suggest building a PLENUM... Slightly more work but you CAN'T
beat the cooling.
Barry
On Tue, Mar 13, 2012 at 11:49 AM, Steve Freeman
<steve.freeman(at)syntaxds.com>wrote:
[quote] Hi guys,****
** **
I am working on installing my engine and installing a Zenair supplied
baffle kit on the Lycoming 0235 engine I purchased from them. Zenair is
suggesting << People typically cover the oil cooler with aluminum tape so
that the air cannot go through it.>>****
Can anyone explain to me why you would want do this? It seems to me that
would defeat the purpose of the oil cooler or at least limit its effective
ability to perform as designed. This was suggested “instead of” installing
a front baffle which they claim is only for extremely cold weather flying
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