El Paso herald. (El Paso, Tex.) 1901-1931, 1920-10-02
The HeruIdS Auto Quiz


fabric, or adjust the brake forward
so that spinning OF the released clutch
member will cease when pedal Is de-
I pressed Spinning Of the main trans
] mission shaft continues as long as the
/ released clutch turns.
z. To determine the correct size
I OF gear for the front wheel drive
style Of speedometer, the number Of
/ teeth in the large gear should be
. twice the number OF inches in the
I diameter OF the tire II larger tires
I are used, change the speedometer
I gear to get correct mileage
s. ore cause Of humming IN the
/ Transmission may be a misaligument
I Of engine, clutch and Transmission. A
. strain. and consequently hum VIII
I result IL transmission Is not in
] straight line with driving shaft or
/ true with clutch and crankshaft Of
I the engine
g The average valve setting OF
I over 100 makes Of cars Is intake
I valve opening 9-5 degrees past top
/ center and closing 81 degrees late:
] exhaust valve opening so degrees be-
I fore bottom center and closing de-
/ grees late, in any L head engine
Z with all valve cams on the same
shaft il IS only necessary to use one
Pof the valve dimensions, or start with
I
/ the inlet Is bound 10 be right II
your car Is not OF this average set
/ ting. change but one tooth OF the cam
shaft gear one way or the other at
a time
10. The regulation OF current out
put in a generator Of a car Is neces-
sary as increased speed would burn
out the lamps and injure the genera
tor, and charge the storage battery
to an excess When the engine is &C
CELEBRATED the speed OF the generator is
increased. and its output OF current
is increased, until a certain limit OF
output IS reached, when curout au-
tomatically shuts off current pr0duc-
ton to battery and lamps.-Copyrigh
1920, Thompson Feature Service.
This weeks Questions
How can a leak r<hich is 50 small
that &c IS unnoticeable Be found IN q
hollow carburetor floatl
2-What IS q good way TO test the
carburetor mixture
3-What are the two ways Of gen
Grating electricity. both OF which are
employed in an automObile1
A-How can you tell II a cylinder IS
cracked inside the water jacket2
5-What is wrong when a car
"drags' even when the engine seems
TO be operating Well2
s-Whar are causes Of oVsrheated
exhaust pipes Of muffler7
How much wire Is needed to
make the secondary winding Of an
ignition coil2
s-What is the boiling point Of al
cohol and gasoline2
9-What IS the cause Of vibration
while an engine is runninE2
1O-HoW IS wind resistance figured
for various speeds Of an automobile2
The word degree" as used IN
connection with engine valve and
magnetic timing implies the unit used
in the measurement OF angles, or
1-360th OF a circle
Average gear ratios for each Of
the four speeds Of a Transmission are, [
for low speed 5-1t revolutions OF the [
engine 70 one revolution OF the rear {
wheels for second speed 1s5 to I; {
for third speed liz 20 !, and fourth I
speed to / The reverse ratio av- 4
5-Double exhaust pipes and uuf- I
flers OF eight and - cylinder cars are I
commonly used. but not absolutely I
necessary A separate exhaust pipe +
running back 20 a separate muller i
freedom for burned gases TO pass to
the open air.
The safety spark gap on high
tension magnetos acts as q safety
outlet for secondary current IN case !
its path or flow was closed For in
stance, II a wire was detached from
distributor or sparEplug, the current
desi gnatec 70 flow through this wire
instead Of running the armature by
forcing passage through its insula-
ton
5-Averags setting Of sparkplug
points for an engine with high com
preston Is 900 inch For medium
compression OF about 60 pounds the
average ls -015, and for low compress
sion. below 50 pounds, the average /
distance Is $50 inch.
6-The following mixture makes a
paint for mufflerH and exhaust pipes: /
Nine parts Of fuller's earth mixed with I
three OF graphite and Two OF oxide OF D
manganese (blackl. add ten parts /
sodium slllcate mixed with four OF I
water and one OF glucose. Stir TIL Il !
may be applied with a paint brush. I
Aluminium paint can also be used
the possible effect OF spark ad- !
vanoed too far when the engine q re-
CURED % move the car against load I
or uphill IS broken connecting rod
or overheaLlng Of the engine. A sharp Z
knocking Is the first sign OF laboring
against advance spark
8-BackfirinE in the muffler IS
caused by too rich a carburetor mix
ture OF when the engine IS not firing
regularly whereas a backfirs In the /
carDuretor Is caused by q leak in the
inlet valve. The former g when un-
ignlted gases pass into the exhaust {
pipe and mufflers and are then *
nited by the next explosion. while the /.
latter occurs when, after an explosion. u
ne l8ulLel gases or part OF them pass
through the intake manifold TO the
carburetor instead OF forcing down 4
the piston
9-The spark created By a magnetic
e umed 80 that Do viii occur at tor
dead center. or end Of COMPRESSION
stroke Battery Ignition Is timed for
the spark 70 occur at about 1-16th OF
IN inch over top center.
1Q-The differential Of cars driven
By double chains IS located on the
.ackshatt, or between the rear axle
and the engine instead OF at the rear
1920. Thompson Fea-
lure Service