1930 Cadillac Brochure Front Cover - GM Heritage Center

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Thus, a single carburetor with one adjustment serves every
possible need. Three main bearings support the short crankshaft in
precise alignment as against the seven or nine required in engines of
greater length. Only four crank throws are required. A single water
pump and single oil pump serve the Cadillac engine. A short, single
camshaft operates the valve lifters directly, without need for intervening
parts.
5. The V-type design promotes cooling.
Temperature within a gasoline engine should be as nearly
uniform as possible, if every cylinder is to do its full, equal share of
the work. Here again, the Cadillac design is a direct advantage.
The entire volume of circulating water is kept within a small area,
reaching easily the most remote recesses of the cylinder blocks, and
traveling in direct routes back to the radiator. A single water pump
maintains an abundant
volume of circulation.
6. The V-type design
results in most efficient
lubrication.
This advantage is
again incidental to the
compactness that is a
salient feature of the
Cadillac engine. All bear-
Jusl as raindrops separate sunlight into the m«S and all operating
colors of the rainbow, so litis spectroscope at °
the General Motors Laboratories separates parts are near the oil
light from hoi metallic vapors into its corn- numD and are reached bv
poneid colors, detecting minute impurities in i 1' J
structural materials
short direct leads.
General Motors Research Laboratories are
equipped with machines to lest the physical
properties of sleel, bronze, rubber fabric, and
all Ihe materials used in a motor car
It is very difficult to
maintain an oil film between
the crankshaft and
bearing metal in a short
bearing. The three large
main bearings of the
Cadillac V-type engine
provide a wide expanse of
metal from which oil does
not readily drain away.
Crankcase ventilation,
pioneered by Cadillac in
1925 to eliminate crankcase
oil dilution, is greatly facilitated by this principle of design. The
compensators upon the rotating crankshaft build up a pressure in
the crankcase and so force all vapors outward into the valve compartments.
There they are used to provide efficient lubrication for
the valve stems, springs, and guides.
In all these ways, the Cadillac engine design promotes long life
and smooth day-by-day performance.
7. The V-type engine provides more room for passenger space.
An automobile power plant is but a means to an end. It exists
only that you and your friends may ride with modern luxury, surety,
and dispatch.
It ought, therefore, to occupy as little space as possible. In this
regard, Cadillac owners are especially fortunate. Their engines,
powerful and capable as they are, are short and compact. And the
resulting spaciousness so noticeable in these cars is directly due to
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