Imperial Valley press., 1929-07-20
GRAHAM M-PAICE
ENGINE CHECKED
BY TACHOMETER

Try tachometer test, if you
would like to see for yourself what
happens under the hood OF your ear
at different road speeds.
The tacheincter works on the
same principle as a speedometef,
but registers the engine speed IN
revolutions per minute, regardless
of ear speed. That is whether the
car is standing still or moving, the
tachometer shows how fast the en-
CINE is turning over.
The newest use of the tachometer
is TO demonstrate the advantages of
the Graham-Paige four-speed trans
mission, so that the passenger may
have visual proof of the low engine
speeds at high road speeds. W. &.
Reed, Graham-Paige representative
in this city, has received tacho-
equipped car and is ready to
give a demonstration to everyone
who calls.
The chief advantage of the Gra-
ham Paige four-spesd drive is not
its one additional speed, but the
fact that it makes possible lower
engine speed at any road speed,
through the use of a high gear rear
axle. AS a result, the engine of the
four-speed ear going 90 miles per
hour is turning over slower than
the engine of three-speed ear go
ing 10 miles per hour. The tach-
ometer shows this plainly, so that
he who rides may read engine speed
at any road speed.
In a four-speed ear (gear ratio
3.6 to u at 60 miles per hour, the
engine speed is only 2495 revolu-
tions per minute.
In IA three-speed ear (gear ratio
Al to i at 60 miles per hour, the
engine speed is 1897 revolutions,
while at As miles per hour, the en-
CINE speed is a502 revolutions per
minute.
The taehometsr eqg,pped Gra-
ham-Paige car quickly makes clesr
certain facts-chief of which is
that low engine speeds mean ease
and comfort, and that in an auto
mobile capable of high road speed
at a low engine speed, the driver
and passengers are not conscious Of
going fast.
According TO the Graham Paige
engineers who are sponsoring the
tachometer test, the average motor
ist has a very indefinite idea of his
engine speed, so that a ride in a
chometer-equipped car will prove
a revelation. The average driver is
not conscious of his engine at speeds
below 45 miles per hour, however,
when he gets above that figure, he
can no longer ignore the motor be-
cause the high speed of the engine,
the whirring of the fan, the roaring
of the intake and exhaust, and in
creased vibration, make them
selves very apparent. 1t is claimed
for the Graham-Paige fourspeed
transmission that, even at very
high road speeds, the engine does
not attain an excessive rate of reyo-
lutions per minute.
The Graham-Paige third speed is
silent internal-geared drive
slightly lower in gear than the di-
rest drive of three-speed cars, Civ
ing a final drive ratio Of 5.25 to /.
Because of its silence and it's high
speed capability, this gear is known
as an additional "high." These two
high gears give the driver great
advantage, fourth providing re-
duced engine speed at any road
speed, and third offering unusually
brilliant acceleration and hill
climbing powers.
The use of internal gears in the
third speed, besides giving drive
of the utmost silence, also makes
it possible to change gears, in
either direction, surely and quietly.
In Lake County, Oregon, only one