Aberdeen herald. [volume] (Aberdeen, Chehalis County, W.T.) 1886-1917, 1915-08-26

., 49, :.
What ;s the reason for heating the
mixture before Il goes to the. cylinders
for combustion? ~
The only reason that We preheat fuel
is to thoroughly vaborlze II In other
words, foraegtven volume md q given
mixture great amount Of heat units
will be contained in the cooler charge
provided that both are completely va
ported. The reason for this Is chat
the heat expands the charge. thereby
permitting a smaller number Of Units
Of discharge to be contained In q CIV
en- volume. The fact that some Of the
heat units which would ordinarily be
lost are returned to actual use by pre-
heating the charge Is factor III the
situation and does reduce the differ
ence between the two conditions. but It
is doubtful If as many heat units would
be given up in this manner as would
be lost by having preheated charge.
The practical side Of the question. how
ever, Is one which must be looked upon.
With the gasoline that we are now get
ting 1t Is necessary to use heated air
II the best results are to be attained;
otherwise the fuel will not be vaporiz-
ed, especially during cold weather.
How many teeth are needed for two
20 one and two and = half TO one ratio7
The gears should be such that there
are twice as many teeth on the large
gear as there are on the small gear.
in order to get two to one ratio. For
a two and one-half to one there should
be two and one-half times as many
teeth on the large gear as there are on
the small one. The ratio may be OBJ
tanned with an infinite number Of COM
binations. The size Of the gearcase
viii determine the size Of the gears,
and then the shape and distance be.
tween teeth must be found to get the
number Of teeth needed.
u,
10 thsrs any poatibIs way In which
can install pressure feed oilins sys.
tenn on my cart Il has q splash system
at present.
It might be possible to install this
pressure feed. but It would not be ad.
visable. In the first place, great
amount Of special engineering work
would be required and many new
parts, such as u hollow crankshaft
and the pump itself. This would en-
tail great outlay of money which
would not be justifiable. because. aft
er the system had been worked out
and installed ON the motor, the under
taking would. in every sense Of the
word, be an experiment. Any trou
bles you may have been having with
your oiling are probably not due to the
original design. but to some local de-
feet which has come up and which can
probably be readily cured in much
more simple way than by altering the
entire system.
Should. the clutch bs thrown out on
rough roads?
The clutch should be thrown out
and the brake applied slightly when
deep ruts are encountered, and many
drivers make riding easier by period
1cally throwing the clutch on rough
roads. II the motor will pull slowly
there is no reason, however. for throw
ing out the clutch.
What valve timing should one uss on
two cylinder opposed motor with .
bore Of four and quarter and . stroke
Of four and half?
Since the valve timing which will
give ideal results for any given motor
is variable quantity and depends
largely upon such details as manifold
design, the only thing which can be
done is to give an approximate timing.
from which you can vary In one direc-
ton or the other until you attain the
best results. If the cams are already
made and In the motor you can only
place them so that the valve openings
will correspond with those given and
allow the closing to take care of itself.
A fairly average timing which should
give good results Is as follows: Intake
valve opens ten degrees after upper
dead center and closes thirty-five de-
grees past lever dead center. Exhaust
valve opens forty degrees before lower
center and closes ave degrees past up
per center.
Does II harm . high tension magnetic
that 10, whore car 10 run by one
alons-to shut off the spark going down
hill and brake with your osars7 10 this
The best thing to do on . steep hill Z
And could this harm the ey4indsrs7
It does not harm high tension mag
neto to do this, as no mechanical strain
- put upon 1t, and naturally 1t does
not generate current when switched
on. The practice Of using the motor
- a brake will not harm the cylinders.
but It Is said to put considerable wear
on the, gears, due to the reversed &C
ton Of the reductien-that IL, II the car
should be geared four to one when the
motor II acting a. brake the reduc-
ton acts In an opposite direction and
becomes one to four.