Evening capital news. (Boise, Idaho) 1901-1927, 1916-04-23
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+ PROBLEMS OF THE MoToRIsT. .
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Motoring Department-The brakes
on my Ford chatter just as the car
comes to stop. had the bands tight
ened and the chattering stopped for a
while, but it is now worse than ever.
The brakes hold good and the bands
are new. Can you suggest a way to
remedy this trouble? r. S.
You do not state whether 1t Is the
foot brake or the hand brake that chat
ters. Assuming that it is the foot
brake, it is evident that the band is
not round and draws irregularly. IT
should be nearly round when released,
so as to draw on drum evenly when
applied.
Motoring Department-Can you out
line the expense that would be neces-
sary to change a motors fuel from
gasoline to denatured alcohol? Also
your opinion Of the same. j. X.
Changing the motor for this purpose
would entail several difficult mechani-
cal changes which would be costly.
An alcohol motor requires different
space than one using
gasoline; probably new pistons would
have to be designed to obtain the best
results.
The age Of alcohol has not yet arriv-
ed and will not until some plant less
valuable for food than corn or pota-
toes is developed winch the average
farmer may grow, under local condi-
tions. The present price of alcohol
experimenting extensively
with motors designed to use it.
Motoring Department-Thcf following
information will be greatly appreciat-
ed:
ta) Provided cylinder walls are not
scored, how much out of round may
they be before reboring becomes neces-
sary? OBJ In four cylinder block
casting (cylinders 8 11-16 inches diam
eter) in need of reboring, what should
be the minimum amount of metal left
between adjacent cylinders after Dor
ingo
(a) .0OS of an inch is the limit. OBJ
The cylinders should be ground, not
bored. This process takes only about
.o1o OF an inch Of metal, therefore they
could be ground several times before
lIle metal becomes 100
Motoring Department. took a
steam gauge and attached. 1t to an old
spar,s plug SHE'LL placed 1t in the spark
plug hole and turned the engine once
to see how much compression there
was. The steam gauge would register
40 to 50 pounds. according to how fast
| turned the engine over / know the
rings leak and would like to know
OF the pressure In pounds
per square inch in the combustion
chamber. In new engine what is the
pressure? Does it vary IL
the pistons are small or large? | sup
pose the length of the stroke would
make variation?
What is the pressure at instant of
explosion; also the vacuum pressure
on the gas charging stroke? w. d.
The size of the cylinders has nothing
to do with the compression pressure.
In new motors the compression
varies from so to 30 pounds, depending
on the type of motor and what 1t is
used for. The ordinary touring car
has 65 pounds at the end OF compress
sion stroke and the pressure rises af
ter ignition takes place to about $50
pounds or more
The vacuum pressure decreases as
the speed of the motor increases.
starting with about IL pounds and fin
ally getting TO point where the motor
will run no faster
Motoring observation-disclosures advise
I gBfnlf
whether an automobile would use more
gasoline at the rate of 80 miles per hour
or ID miles per hour, at a given dis
lance. JK
1t would probably give the greater
at Is miles on a level road. AT
Is miles on level ground the resistance
would be less than at 30. On hill roads
10 miles would neeessitate dropping to
second speed. 50 that the additional
speed on the engine on hills would ov
erbalance the difference in wind pres
sure.
Motoring Department. have Ford
car which was recently examined. The
result was that the valves were ground
in, new commutator and new spark
plugs were installed. had not driven
the car block when l noticed miss
In one cylinder and after going another
short distance the miss still continued:
| turned around and drove back.
The garage people took the car and
tried II out again, but when nothing de-
took it and started for home.
l notice the miss only occasionally,
but when about halfway home and
along at about 10 miles per
hour the car suddenly commenced to
lose power. and would have died had /