Nogales international., 1929-07-26
RESULT SHOWN
in INSTRUMENT
BY AMERICAN
MOTORS CORP.
Tach0neter Proves
Reduced Engine
Speed

happens under the hood of your
car at different speeds, try the ta-
chometer test"
This advice, from A. E. Aviles Of
the American Motors Corporation.
Graham-Paige distributors, is ad-
dressed to all motorists who are in
terested in reducing engine wear
and tear and increasing the life of
the car.
THE tachometer works on the
same principle as the speedometer
on any car, but registers the en-
gine speed in revolutions per min
ute, regardless Of the speed which
the car is travelling. In other words,
the tachometer registers the speed
of the engine whether the car is
standing still or moving"
The use of the tachometer is for
the passenger to have visual proof
of the low engine speeds at high
road speeds on the Graham-Paige.
The American Motors Corporation
of this city have received tacho-
meter from the factory and state
that they are now prepared to
give demonstrations.
Visual Demonstration
The tachometer is a small in
strument that has been devised by
Graham-P Paige engineers. It is
placed before the eyes of the driv-
er, or the passenger, to show that
the engine speed of a Graham
Paige in fourth gear is 25 per cent
less than that of an average car
when the two cars are travelling at
corresponding speed on the road.
This Is per cent lower engine
speed means smoother operation at
high speeds, rapid accelation, new
silence and swiftness, easier and
less frequent gear shifting, reduced
wear and longer life, easier handl-
ing and restful relaxation" Aviles
stated.
The chief advantage Of the four
speed is not that it provides addi-
tional speed but that, it gives lower
engine speed at any road speed.
through the use of new high-gear
rear axle, he added. AS result, the
engine of the four-speed car is
turning over more slowly at go
miles per hour than the engine of
an average car going As miles an
hour. The tachometer shows this
plainly, so that the passenger or
driver may read engine speed at
any road speed.
In four-speed Car (gear ratio
S.6 to y at SO miles per hour, the
engine speed is only 2,495 revolu-
tionS per minute.
In a. three-speed car (gear A. to
u at go miles per hour the engine
speed is 1887 r. p. m. while at 40
miles per hour the engine speed is
2,502 r. p. IN.
Ease Of Four Speeds
The tachometer- equipped Gra-
ham-Paige Car quickly makes clear
certain facts, chief of these being
that low engine speed makes for
more comfort and ease and that in
an automobile of high road speeds.
the driver is not conscious of go
ing fast.
According to the local distribu-
orS, who are sponsoring the test,
the average motorist has very de-
finite idea of his engine speed so
that a car equipped with the tach-
ometer will prove a revelation. The
average driver is not conscious of =
his engine speeds below As miles
per hour. When he gets above that
figure, however, he can no longer
ignore the motor because of the
roar of the motor and the whirr of
the fan. Increased vibration also
plays its part.
1t is claimed by the American
Motors Corporation for the four
speed Graham-Paige t-lat even at
high road speeds the motor does
not attain an excessive rate of re-
VOluIIO1lS per ul111uC0s
The Graham-Paige third speed
is a silent internal-geared drive
slightly lower than the drive of
high gear in the three-speed cars,
giving final drive ratio of 5.21 to
/. Because of it's silence and it's
capability for high speeds, this
gear is known as an additional
"high". These two high gears give
the driver great advantage, four
providing reduced engine speed at
any road speed, and third, offer
ing unusually brilliant acceleration
and hill climbing ability.
The change of gears, particularly
the change from third to fourth, is
made without the slightest bit of
noise or effort. This is true of all
changes.