Some are thermo controlled, some aren't. Take the P-51 Mustang,
liquid cooled, dry sump, separate oil and coolant radiators. Pilot
controls the gross air flow; thermo does the rest. Howsomevr, these
engines are meant to run at altitudes from 0 to 35K feet. Brrrrrr....
CR
Bob Howard wrote:
>
> On Sun, 16 Jan 2000 20:43:15 -0600 Charley & Peggy Robinson
> <ccrobins@ktc.com> writes:
> > Hmm,
> Charlie,
> The idea behind covering the oil cooler is that oils perform best
> within certain temperature ranges, even though they are blended as
> multi-viscosity lubricants.
> 20 weight oil is molassas-like at 20 degrees, so getting it to the
> desirable viscosity and circulate in the engine quickly is the goal. In
> bitter cold weather, the extra cooling of the oil cooler drops the temp
> of the oil below the desired operating range. The sump itself will
> provide sufficient cooling.
> I have not seen any objective writings on the subject for automobile
> engines, but there is a lot of it published for air-cooled aircraft
> engines. Some planes are set up with shutters that control the air flow
> to and through the oil cooler.
> Bob
>
>
> > ---snip--
> > up OK in the winter and cools OK in the summer. I just can't figure
> > why
> > you have to cover the oil cooler; maybe I should, next cold snap.
> >
> > CR
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