Air cooled engines, like the one
in my airplane, are actually cooled by more than just air blowing past the
cylinder's cooling fins. Internally,
some of the heat is carried away by the engine oil. This cooling is improved by the addition of a
radiator for the oil. In this posting, I
will illustrate the installation of my oil cooler Induction hardening Faridabad.
The engine in my plane is a
little larger than the standard engine for this aircraft and so I elected to go
with a larger oil cooling radiator. The
trouble is that the larger radiator will not fit in the standard location which
is hanging off of the baffles behind the rear left cylinder. To overcome this problem, I will be
relocating the cooler to the left side fire wall.
Whenever you veer off of the
plans to make some sort of modification to the stock aircraft you are skating
on ever thinner ice as you go. But this
mod doesn't have any structural ramifications so I think I'm pretty safe here.
First up: make some brackets to mount the cooler to the
firewall.
The cooler's air source will be
the higher pressure air above the engine on the left side and will be connected
to the cooler by a flexible 4" hose.
An intake plenum is required to adapt the hose to the cooler and that
will be constructed of fiberglass. A
male mold is fashioned using modeling clay and a roll of tape that is just the
right size for the hose (after I peeled off about 5 ft of tape) case hardening in Faridabad.
Indirect Cooling
In indirect cooling, the oil is
cooled through the heat transfer of an intermediate medium, Weber explained.
“This is an outside system with
an external heat exchanger, which uses water, liquid [such as glycol] or
refrigerant, or thermos phoning to cool.” Shell-and-tube and plate-type heat
exchangers would both use indirect coolers.
In water-cooled external heat
exchangers, oil flows out of the separator. Either a pump or differential
pressure forces oil through the heat exchanger. The oil temperature usually is
controlled by the thermostatic valve controlling bypass of the heat exchanger.
Weber said that water-cooled
cooling system components include :
- External shell-and-tube or plate-type heat exchangers;
- Three-way valve for temperature sensing, or a water-regulating valve;
- External piping; and
- A relief valve
- The heat exchanger cools the oil before it is injected into the compressor.
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