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flyv35b(at)minetfiber.com
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 Posted: Tue Nov 08, 2011 6:45 am Post subject: Oil Temperature Control |
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I hate to change the subject about oil level but I recently made and
installed a valve that will control the air flow to the inlet of the oil
cooler on my O-320 powered Lynx. When I installed this engine several
years ago I wondered if the small stock AA-1C cooler would be adequate
but decided to use it until testing proved otherwise. It has worked
well even at high ambient temperatures during extended climbs. But my
cooling with this engine is actually better than needed and during the
cool weather here in the NW the oil temperature will not get up even
close to 175F where there is half a chance of evaporating the moisture.
I got tired of taping over the inlet to block part of the air flow so I
fabricated a cockpit adjustable air valve to regulate the flow and
therefore the oil temperature. It's operated by a simple push-pull
cable with a ratchet lock, much like th stock mixture cable. A test
flight a couple of days ago showed a 20F temperature reduction from no
air flow through the cooler to maximum flow with a 2" diameter supply
duct. This was at about 80% power at 3000 msl and 40F OAT. Pretty good
for such a small cooler. But the real benefit is the ability to
regulate the oil temperature for operation in a more ideal range.
Larger coolers which are commonly used probably result in more like 30F
reduction.
Also, there was some discussion recently about how to route a manifold
pressure line. I did it very simply with a connector from the #3
cylinder and hose through a snap in bushing in the rear baffle to a
bulkhead fitting on the firewall. This may not work as well with the
normal baffling.
Cliff
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teamgrumman(at)yahoo.com
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| Posted: Tue Nov 08, 2011 11:04 am Post subject: Oil Temperature Control |
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Bill Kelly has the same experience with his O320-AA1C. He has some sort of manual controled valve.
From: flyv35b <flyv35b(at)minetfiber.com>
To: "teamgrumman-list(at)matronics.com" <teamgrumman-list(at)matronics.com>
Sent: Tuesday, November 8, 2011 6:41 AM
Subject: Oil Temperature Control
I hate to change the subject about oil level but I recently made and installed a valve that will control the air flow to the inlet of the oil cooler on my O-320 powered Lynx. When I installed this engine several years ago I wondered if the small stock AA-1C cooler would be adequate but decided to use it until testing proved otherwise. It has worked well even at high ambient temperatures during extended climbs. But my cooling with this engine is actually better than needed and during the cool weather here in the NW the oil temperature will not get up even close to 175F where there is half a chance of evaporating the moisture. I got tired of taping over the inlet to block part of the air flow so I fabricated a cockpit adjustable air valve to regulate the flow and therefore the oil temperature. It's operated by a simple push-pull cable with a ratchet lock, much like th stock mixture cable. A test flight a couple of days ago showed a 20F temperature reduction from no air flow through the cooler to maximum flow with a 2" diameter supply duct. This was at about 80% power at 3000 msl and 40F OAT. Pretty good for such a small cooler. But the real benefit is the ability to regulate the oil temperature for operation in a more ideal range. Larger coolers which are commonly used probably result in more like 30F reduction.
Also, there was some discussion recently about how to route a manifold pressure line. I did it very simply with a connector from the #3 cylinder and hose through a snap in bushing in the rear baffle to a bulkhead fitting on the firewall. This may not work as well with the normal baffling.
Cliff
[quote][b]
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