Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1920-06-23
The Auto Quiz

1.-Whysis tho automobile engine
timed SO that on high spark an ex-
plosion occurs before the piston
reaches tho top Of dead center on
compression
| An automobile engine IS timed SO
that on high spark spark occurs
at each plug trifle before the pis-
ton reaches the top OF center on the
compression stroke. a lapse Of time
is necessary to ignite completely the
gas charge. The time required for
ignition Of the charge and that re-
auired for, the piston to reach the
top Of dead center should be prac.,
tically the same when the. engine is
running at high speed. Thus full
force is exerted at the beginning Of
the power stroke.
2-How does the ignition of a
charge Of gasolene vapor in a/cylin-
der produce driving power in the en-
CINE?
The ignition Of a charge Of gasolene
vapor in cylinder produces driving
Po"VH Ny lbo CApdHSlOtl LIE COHl-
pressed gases. which. when ignited
by the spark. explode. AS the kpis-
ton is the only movable thing in the
cylinder affected by the explosion. 1t
receives the full force Of this ex-
plosion, being driven sharply down,
thus transmitting power the the drivs
ing shaft.
S.-What would result II the wires
were removed from the generator and
reattadhed to the wrong terminals?
If the wires were removed from the
generator and reattached to the
wrong terminals there would be
discharge reading at the ammeter
when the generator was charging the
battery and vice versa, Continuous
running with the wires twisted would
lead to a rapid discharge Of the bat
terry.
lis there any disadvantage in
fusing q 34x4 inner tube in 33x4
casing?
"A, 34x4 inner tube can be used in
a 33x4 casing but should only be done
in an emergency. AS the tube is an
inch bigger than the casing size there
| Is bound to be creasing OF the tube
which will cause undue friction. Be-
sides the slight difference in cost.
the wrong size tube will not give the
wear correct sized one would.
5.-What are five conditions nee
essary for the continuous operation
Of motor?
The five conditions necessary for
the continuous operation Of motor
are: l. carburetion: g., ignition; 8,
compression; i, fabrication; S, cool
ing.
6.-How often should the cooling
system of a motor be flushed out and
what Is good method?
The cooling system Of motor
should be flushed out at least once
a season and preferably twice. Open
the radiator pet cock and drain the
system. Leaving the pet cock open,
send in a slow stream of water from
hose into the radiator filler cap.
Run the motor slowly. This will In
crease circulation Of the water. After
short time, stop the engine, close
the pet cock and remove the hose. A
great deal Of the sediment which was
bound to have been deposited In tho
system will have been flushed out.
| 7.-What is the average consump-
ton Of gasolene per year per car?
The average consumption Of gaso-
line per car per year in this country
is from ten to fourteen barrels. This
is figured from the, number Of cars
in use and the yearly consumption
Of gas.
| >s-What should be looked for be-
fore starting to tune up an engine?
Before tuning" up an automobile
preston in each cylinder. A weak
engine see that there is good COM
cylinder Will often cause the engine
to run as IL the carburetor were out
of adjustment.
9-What does grinding noise or
growl indicate in the differential
gears when a car Is turning corner?
If there is grind or growl in the
differential when the car turns, it
usually indicates wear In those parts.
OnSa straight course the differential
turns as a unit. so that the noise is