Evening star. [volume] (Washington, D.C.) 1854-1972, 1921-01-02
FORCES UN[EASHED
|NM0TOR ENGINES
English Scientist Brings Out
Facts Interesting to
Drivers.

Little conception is entertained by
the average motorist of the tremendous
forces that are unleashed when he
starts the engine of his car" says the
National Motor Car Corporation.
/ Recently a noted English scientist
brought out some interesting facts in
! the connection that are we'll worth
knowing, serving to increase the APP
| drives a car for the marvellous mechan-
ism that he uses in so matter-of- fac,
a way.
! For instance. it was calculated by
. this scientist that piston with a
| stroke of five and one-half inches and
| an engine speed of 1000 revolutions a
| minute Is moving at a rate of seventy
two miles an hour
| I'm the course of 200-mile journey
the piston. weighing slightly less than
a pound. has to travel up and down in
| its cylinder $4,000 times. At the tor
and bottom of each stroke it has to stor
and start again in the opposite direc.
| ton. II any one will take a weight OF
one pound and quickly move it backward
and forward over a distance of five ano
one-half inches he will find it rather
firing.
! Red Hot Most of Time.
| Engine valves are also reciprocatins
| WOTE
! to perform. valve spends much Of it.
| life red hot. and has to lift three six
teenths inch or more in one-four hun.
dredth of a second, returning again al
the same speed.
Springs are used to return mos,
valves, and. as the speed of the valve
Is six miles an hour, naturally a very
strong spring is required. Some ex.
haust valve springs are equal to E
weight OF 100 pounds. and this 1901 oun6
load has to be lifted by the cam from
standstill to height of three-six.
about six miles an hour.
! In 200-miie journey alone the
amount Of work done by the six exhaus
cams Is not unlike that Of raising a two.
story house twelve feet in the air-ad.
| mittedly no easy task.
In the operation Of any car. mucf
heat is naturally lost. The amount o,
4 work that the radiator has to do ir
| this connection, however is not an.
! preciated until it is realized that the
heat put into it during the course. of Z
| 20o.mile run would certainly boil tea
kettles in $50 different houses
| so it goes throughout the entire
| catalogue Of the parts Of car. Each
| performs under stresses and strain.
! that make one marvel how they en-
dure them all.
100000 Motions in Fifty Miles.
For example. each spring of a ca,
Will move up and down at least 100, 00(
times on a run over average roads OF
fifty miles.
"Or, to consider the braking mech.
anism. when a car weighing with pas
sengers 1000 pounds Is brought to q
stop from fifty miles an hour the en-
ergy dissipated would comfortably
lift locomotive several inches in the
air.
$50 simple an accessory as the
starting and lighting generator will
on four-hour run. put five amperes
into the battery at six volts. and this
in energy would light up an Atlantic
liner to every ones satisfaction for
quite one minute
Cars dissipate power in many ways
that are not even suspected by those
who use them. They even generate
electricity by their passage through
the air. Considering what they have
to go through every day. under aver
age conditions, it is a wonder any of
them stand up SO loyalty to their duty.
Nothing in the world appreciates
good treatment SO much as metal II
drivers would consider what happens
when they drive they could not re-
strain their sympathy"