AIR
-
VAC COOLING
With optional air
-
vac cooling, air circulation is opposite to that of the standard system.
On
Air-
Vac equipped engines, a blower unit and support are attached to a special flywheel which does not have
fins.
Rotation of the blower causes cooling air to be drawn in from the sides and rear of the engine,
past the cooling fins and into the special scroll work located at front of engine.
From here, the heated
air is ejected usually toward either side of the engine
--
the scroll can also be mounted to outlet in up or
down positions depending on the application. The
only service required with this system is to make
sure that cooling fins, blower and outlet screen are maintained in clean condition at all times to pre
-
vent overheating due to restricted air circulation.
Special cold weather equipment
is
also available with Air
-
Vac systems. This system is com
-
prised of a thermostatically operated air shutter unit and often includes a carburetor de
-
icer
or
heat
-
ing unit. When the engine is cold, the shutters are held in partially closed position to restrict air
circulation thereby allowing more rapid warm up of the engine.
A
bellows type thermostat, which is
mounted on a bracket on the cylinder head, gradually expands with increasing temperature. This
action is transmitted through ball joint linkage to gradually open the shutters with increasing operating
temperatures. When engine is thoroughly warmed up, the shutters will he wide open (unless operating
in severe cold),
and offer zero restriction to air flow.
To Next Page
Loading...
Need help?
General
