Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1920-09-15
Questions Of Car
Owners Answered

and Is usually heavier than that of
a six or eight because there are GER
tain periods in cycle OF the foi'r ."
ing which very little pressure Is ex-
erted on the crankshaft by the pls
tons. An explosion occurs every half
revolution. and during the lapse be-
tween power strokes the flywheel
must carry over the shaft. In a six. s
In engines OF more cylinders explos-
ions overlap. an explosion or power
occurs before former has been cons
pleted, therefore lighter flywheel is
just as effective.
3.-How many cam shafts does the
eight and twelve cylinder V tyue en-
CINE have? How many cams are re-
quired to shaft?
A V type engine of eight or twelve
cylinders may have one or two cam
shafts. but ;one only being the more
popular A single shaft may have an
individual cam for each valve or. may
have each cam operating two valves.
Both kinds,are in use
4.--What Is the condenser of an in.
duction coil or magnetic armature?
The condenser of an induction coil
or magnetic armature consists of two
sets of sheets of some soft electrical
conductor such as tinfoil each sheet
being insulated, usually by mica in
sulation. These sheets are all con-
lnected to each other one set alter
mating with the other. and are
shunted across the interrupter of the
magnetic coil by connection with the
primary winding conductor and
ground. The condenser's object is
TO consume extra current created
when interrupter points separate. It
makes "A quicker spark and does
away with arching at the points.
5.-What is a good rust pre-
ventive to apply to motor exterior?
A good paint that will prevent
rusting Of exterior Of engine is a
light colored paint Composed of six
ounces Of linseed oil. half pound
white lead in oil. one ounce lamp
black and about two ounces of tur-
pentine.
6.-Near which valve should the
spark plug be located in the cylinder?
Why is it placed in, this direction?
The spark plug should always be
placed nearest the inlet valve This
is the proper location as it will be
enveloped in the fresh charge as it lis
drawn into the cylinder, more read
lily igniting 1t, and as burned gas and
oil would foul the plug We're it placed
near the exhaust valve.
What is the automatic spark
control? How is it operated?
The automatic spark control Is a
centrifugal governor located at the
top of the timer shaft, which, in
creases the speed of the timer con-
facts as the speed Of the engine in
creases. The weights Of the governor
move outward on increased speed,
causing the shaft on which the timer
Is mounted to turn farther to the ad-
vance position. or toward that d.
| rection in which the governor rotates.
Show many feet per minute
would a piston Of an engine travel
which is operating at the rate of 500
revolutions per minute and has a
stroke of four inches? How is this
figured?
The piston in an engine which is
operating at 500 revolutions per
minute, and which has a stroke of
four inches, would travel at the rate
of 333 1-3 feet per minute. The r.
suit is obtained by adding the down
ward and upward strokes of a piston
in inches, multiplying this sum by
the number of revolutions per minute
of the crankshaft and dividing this
result by twelve to get the answer in
feet per minute.
9.-What Is a way to remove a
tight fitting stud without damaging
the threads?
To remove a tight fitting stud the
simplest way without damaging the
threads is to screw two nuts on the
stud, lock them together by turning
one nut against the other, and plac-
ing a iwrench on the lower nut turn
out the stud.
10.-What is a good way to find a
f! leak in a radiator?
A good way to find a leak in a
| radiator, possibly the easiest if the
leak is very small, is to drain the
| radiator, cover the filler cap and in
| let, and plug the outlet. leaving just
/, enough space so that the hose of an
air pump may be-inserted. Immerse
! the entire radiator in water and
J pump air into it. A leak will force
bubbles to the surface of the water