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Bruce(at)glasair.org
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 Posted: Tue Jun 24, 2008 6:46 pm Post subject: GIII Oil Temp Problem |
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The older Positech oil coolers had a low flow rate and they changed their design. You might contact the Positech factory and see if your cooler is pre or post fix. If all else fails, find someone with a SW cooler for a GIII that you can borrow. the SW is more efficient than the Positech.
Bruce
www.Glasair.org
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Craymondw(at)aol.com
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| Posted: Tue Jun 24, 2008 6:59 pm Post subject: GIII Oil Temp Problem |
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Sounds like a bad air leak or blockage from turbulence. My engine ran high temps when new until I plugged every leak in the baffling I could find and air foiled the intake. When the engine finally broke in, the oil temp went down another 20 degrees (about 50 hours). I also cruise at higher altitudes during the summer months around 8500 feet. I recently flew to Destin Florida in 94+ outside temps and experienced 215 oil temps at 3500 feet, but when I climbed to 8500 feet it went down to 190. One builder friend added another small oil cooler, another an enclosed plenum and lowered their oil temps. Remote oil filters can also help cool oil. Leave full throttle on climb out, full throttle on injected engines dumps extra fuel that cools the cylinders. If you want to reduce power come back on the prop and try to maintain a cruise climb of 140 plus mph. Lastly, I removed metal ducting from the bottom of my oil cooler that I think ended up causing turbulence and that helped.
Gas prices getting you down? Search AOL Autos for fuel-efficient used cars.
[quote][b]
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s_korney(at)hotmail.com
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| Posted: Tue Jun 24, 2008 8:02 pm Post subject: GIII Oil Temp Problem |
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Where are you...?
Best... Steve
| Quote: | From: N37j(at)aol.com
Date: Tue, 24 Jun 2008 22:02:15 -0400
Subject: GIII Oil Temp Problem
To: glasair-list-digest(at)matronics.com
I first flew my glasair III last Sept. It now has only 10 hours, mainly because of a persistent oil temp problem. It has a Monte Barrett engine, with full Christen Inverted System. My oil cooler is a Positech 13 row unit, advertised in Aircraft Spruce as applicable to a Lycoming IO540, which mine is. The cooler is firewall mounted, with exit air on the lower right cowl. My own louver design. Induction air is by a NACA-like scoop directly ahead of the cooler, with a 4in diameter scat connecting the induction inlet directly to a plenum I made to force the incoming air through the cooler. No leaks that I can detect. The scat is about 5in long. We removed the Vernitherm and heated it in water. It opened at about 180 degrees, and was fully open, as best we could tell, at about 200 degrees, so it's probably OK. Oil cooler and hoses to it from engine are clear. The oil temp sensor shows 210 degrees when the water boils, so it's OK. Notwithstanding all the above, in flight at 24 squared and 4000 ft. the oil temp climbs quickly to 230 degrees, and might even climb higher if I flew more than 1/2 hr or so. I've talked with Barrett and other informed folks about this and of course laid awake nights trying to figure what's wrong. I'm stumped and a little discouraged. What a great airplane, and I can't fully enjoy it. Any ideas?
Gas prices getting you down? Search AOL Autos for fuel-efficient used cars.
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The other season of giving begins 6/24/08. Check out the i’m Talkathon. Check it out!
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s_korney(at)hotmail.com
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| Posted: Tue Jun 24, 2008 8:05 pm Post subject: GIII Oil Temp Problem |
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maybe that's because your making less horse power at 8500 ft. than at 3500 ..
Best... Steve
| Quote: | From: Craymondw(at)aol.com
Date: Tue, 24 Jun 2008 22:57:16 -0400
Subject: Re: GIII Oil Temp Problem
To: glasair-list(at)matronics.com
Sounds like a bad air leak or blockage from turbulence. My engine ran high temps when new until I plugged every leak in the baffling I could find and air foiled the intake. When the engine finally broke in, the oil temp went down another 20 degrees (about 50 hours). I also cruise at higher altitudes during the summer months around 8500 feet. I recently flew to Destin Florida in 94+ outside temps and experienced 215 oil temps at 3500 feet, but when I climbed to 8500 feet it went down to 190. One builder friend added another small oil cooler, another an enclosed plenum and lowered their oil temps. Remote oil filters can also help cool oil. Leave full throttle on climb out, full throttle on injected engines dumps extra fuel that cools the cylinders. If you want to reduce power come back on the prop and try to maintain a cruise climb of 140 plus mph. Lastly, I removed metal ducting from the bottom of my oil cooler that I think ended up causing turbulence and that helped.
Gas prices getting you down? Search AOL Autos for fuel-efficient used cars.
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target="_blank">http://www.matronics.com/Navigator?Glasair-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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The i’m Talkathon starts 6/24/08. For now, give amongst yourselves. Learn More [quote][b]
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phil stitzer
Joined: 10 Jan 2006
Posts: 1
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| Posted: Wed Jun 25, 2008 4:51 am Post subject: GIII Oil Temp Problem |
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The canards spend a lot of time getting their cooling right ......... go to www.ez.org and download the powerpoint presentation by Terry Schubert given at Oshkosh last year ......... should be some good points their for you to follow.
Phil
N37j(at)aol.com (N37j(at)aol.com) wrote: [quote] I first flew my glasair III last Sept. It now has only 10 hours, mainly because of a persistent oil temp problem. It has a Monte Barrett engine, with full Christen Inverted System. My oil cooler is a Positech 13 row unit, advertised in Aircraft Spruce as applicable to a Lycoming IO540, which mine is. The cooler is firewall mounted, with exit air on the lower right cowl. My own louver design. Induction air is by a NACA-like scoop directly ahead of the cooler, with a 4in diameter scat connecting the induction inlet directly to a plenum I made to force the incoming air through the cooler. No leaks that I can detect. The scat is about 5in long. We removed the Vernitherm and heated it in water. It opened at about 180 degrees, and was fully open, as best we could tell, at about 200 degrees, so it's probably OK. Oil cooler and hoses to it from engine are clear. The oil temp sensor shows 210 degrees when the water boils, so it's OK. Notwithstanding all the above, in flight at 24 squared and 4000 ft. the oil temp climbs quickly to 230 degrees, and might even climb higher if I flew more than 1/2 hr or so. I've talked with Barrett and other informed folks about this and of course laid awake nights trying to figure what's wrong. I'm stumped and a little discouraged. What a great airplane, and I can't fully enjoy it. Any ideas?
Gas prices getting you down? Search AOL Autos for fuel-efficient used cars.
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