Today's Message Index:
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1. 05:51 AM - Re: GIII Oil Temp Problem (Phil Stitzer)
2. 08:03 AM - Re: Oil cooling problems (Craymondw@aol.com)
Message 1
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| Subject: | Re: GIII Oil Temp Problem |
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@aol.com wrote:
> 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?
>
>
> ------------------------------------------------------------------------
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> *
>
>
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Message 2
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| Subject: | Re: Oil cooling problems |
When I reported that my oil temp at 3,500 feet was 215 and 190 at 8,500
feet. On my last week end trip the out side air temp dropped from 92 to 79 at
8,500 feet. That is much cooler air going over the cylinders and through the oil
cooler. Whenever I cruise at 3,500 feet on hot days in 90 plus weather using
only 2300 RPM and 23 inches I still have 215 degree oil temps. In the winter
I have to partially block my oil cooler inlet to keep my oil temp above 170.
I once used temperature probes through out my engine compartment and found
the air in the plenum the same as outside air temps. And I recorded oil cooler
exhaust temps the same as my oil temperature. I noticed a slight increase
in air temp in my oil cooler shroud and wrapped the ducting with foil
insulation to keep that air cool. I also shined a bright light into the front of
my
cowl and noticed the seal had buckled down in two spots allowing air to get
by and reshaped those areas. Any air that gets by the baffling increases air
pressure around the oil cooler exhaust that restricts air flow through the
cooler. I use a SW oil cooler.
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