1938 LaSalle Production - GM Heritage Center

for the twelve. Furthermore, as the speed increases,
the Sixteen fluctuations become smaller while the V-12
fluctuations increase. The twelve cylinder vibration
curve variations reach a maximum when coasting at
high speed, whereas the Sixteen torque variations become
zero, represented by a straight line, under these
conditions.
Durability: Because the displacement of each cylinder
of a sixteen cylinder engine may be smaller, the
very short stroke of 3¾ inches is possible. This engine
has the lowest piston travel of any American made
automobile. This is in conformance with Cadillac practice
of a large engine of tremendous reserve power yet
always operating slowly, thereby achieving longer
engine life and operating economy. Piston^ travel of
the new Sixteen engine is 1590 feet per mile: of a
typical twelve, 2270; of LaSalle V-8 and. Cadillac
Sixty, 2080.
The short stroke reduces the inertia forces of Jthe
reciprocating pistons. Connecting rod bearing loads are
thus reduced, thereby increasing durability. The short
stroke contributes still further to connecting rod bearing
life because shorter and lighter rods may be used.
With the short stroke and light impulses two inch
diameter crankpins afford extreme rigidity and reduce
rod bearing friction.
Small bore engines wear less than large bore engines
having the same piston travel. The use of sixteen cylinders
makes it possible to use a relatively small
piston despite the very short stroke.
Performance: Sixteen cylinders permit large displacement
for a given hood length. Furthermore, the small
cylinders permit the use of the high 6.8 to 1 compression
ratio which increases combustion efficiency, resulting
in greater power development relative to engine
REVISED 12-15-37
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