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LONGER ENGINE LIFE
Even though on the first thought it might seem that the increased pressure
on the pistons of a supercharged engine might mean greater strain and shorter
engine life, the most careful laboratory and road tests prove conclusively
that the use of a supercharger lessens engine wear and lengthens the life
of bearings. There are four strokes in a four cycle motor, occurring in
the following order: Compression, Explosion, Exhaust and Intake. The first
three cause a downward thrust of connecting rod bearings and piston pins
against their adjacent wearing surfaces. However, on the intake stroke,
a serious reverse shock loud is imposed upon these bearings. This jar or
shock, which is the worst of the bearing loads, is eliminated in the supercharged
engine by the pressure which the incoming fuel mixture exerts on top of
the pistons.
SMOOTHER PERFORMANCE
A great contributing factor towards smoothness in an automobile engine
is the proper mixture and distribution of fuel at all speeds. This is a
difficult job for a carburetor and manifold system operating under atmospheric
pressure. However, when a system of positive induction under pressures
greatly exceeding those of the atmosphere is used, the problem becomes
a much simpler one. Therefore, when the fuel is mixed by the action
of the rotor in the McCulloch Supercharger under tremendous centrifugal
force, it is so well atomized and evenly distributed to all cylinders that
an increase in smoothness results.
EASILY INSTALLED
One of the most important features on the McCulloch Supercharger is
the ease with which it can be installed. Each unit is shipped complete
with all necessary parts, fittings, and instructions. Any mechanic with
the simplest kind of tools and the most elementary knowledge can make a
perfect installation. There is not even a single hole to drill!
MECHANICAL FEATURES
The 1938 McCulloch Supercharger, which fits 1937 and 1938 Ford 85 H.P.
engines, has many outstanding mechanical features and embodies numerous
improvements over previous models. This new model Supercharger is the first
in America to control the temperature of the incoming mixture automatically.
This is done with a thermostat element placed directly in the intake passageway.
It operates a butterfly shutoff valve which limits the flow of exhaust
gases through the jacketed rotor housing. This results in amazingly rapid
warm up, smooth acceleration, and maximum top speed performance.
The 1938 Model incorporates a new type of silent worm gear developed
especially for this application. Although all the bearings are full pressure
lubricated from the engine oil pump, no external oil lines are used-oil
being taken directly from the engine relief valve through the valley cover.
A new type automatic belt tightener is used, insuring correct belt tension
at all times and eliminating any possibility of slippage or incorrect adjustment.
DUAL EXHAUST SYSTEM
Each 1938 Model McCulloch Supercharger is shipped with a complete kit
of parts for dual outlet at no extra cost. This consists of an additional
left hand muffler, tail pipe, muffler inlet pipe, and all fittings, brackets
and clamps necessary. The use of this double system is vital to the performance
of the Supercharged engine, as exhaust back pressure will prevent the motor
from developing its full horsepower.
Also, two chromium plated Supercharged name-plates are supplied with
each of the new Superchargers. These are very attractive and make an outstanding
ornament. Furthermore, every unit is handsomely painted, and each rotor
is beautifully buffed and polished .
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