I have flow behind several O-200 and none of them have had an oil cooler.
I've never really had a temp problem out of them, but they have all been on
C150s. I do remember seeing a mod at one point in time that added fins to
the spin on filter to help cool a little more but I can't find it now.
On Wed, May 30, 2018 at 7:21 PM, Jeff Scott via KRnet <firstname.lastname@example.org>
> Hi all,
> This question is for anyone who has flown behind the 0-200, did your
> aircraft have an oil cooler? For anyone that perhaps changed their system,
> either to or from, did you notice any significant difference?
> I currently own a Davis DA-2, and it has an oil cooler, mounted to the
> side of the lower cowling next to some vents. I would like to install an
> oil filter system, which would mean removing the oil cooler to mount the
> oil filter assembly. I have only flown it in the fall and over the winter,
> the temperatures were cool, maybe even a little too cool. But I haven't
> flown in the heat of summer so i do not know if the extra cooling is
> It appears the oil cooler was originally attached to the rear of the
> cylinder baffles, then moved at some point to its current position. I know
> the plane was originally built in Florida, but most of the year we aren't
> as warm here. (though last weekend we broke hi temp records at a
> "blistering" pace, 103 degrees in May in Nebraska, yikes).
> Please share thoughts/opinions/experiences...
> While the O-200 was designed by Continental to accommodate an oil cooler,
> very few applications ever required it. The most popular plane to use an
> O-200 was the Cessna 150, and it did not use an oil cooler. There was an
> opening just below the spinner to supply air, and a baffle under the engine
> to direct that air along the bottom of the engine and onto the oil tank.
> That was generally sufficient to keep the engine within spec for the oil
> temp. On my KR, I didn't use the lower baffling or provide the inlet hole,
> but instead built a standard air box inside the carb air inlet area with
> sufficient room to spill air over the sides of the air box to cool the oil
> tank. Outside of that, my engine is very tightly cowled. Worst case I've
> seen in New Mexico with extended summer time climbs to altitudes >12,000',
> I saw oil temps top out at up to 225°, and that is while using Emags that
> are pushing the engine timing up to 39° BTDC. That is still in the green
> for the O-200, and about as extreme as I could possibly do to this engine.
> My typical summertime oil temps usually top out at 210° on climb, then drop
> back to 200° during cruise. While I know a couple of the newer KRs out
> there are using oil coolers on their O-200s, I suspect they were installed
> more as an abundance of caution than necessity. After 1200 hrs operation in
> my KR, I don't see the need to carry the weight of an oil cooler for an
> O-200 on a KR. If the oil temps are running high, a little air supplied to
> the front of the oil tank should address the issue.
> -Jeff Scott
> Cherokee Village, AR
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