The Oskaloosa herald. (Oskaloosa, Mahaska County, Iowa) 1885-1919, 1915-09-16

OF late I have been putting one gal
lon of coal oil to ten of gasoline in my
tank and have found il satisfactory, but
could that be the cause Of the large
amount of carbon in my ensins2 The
earburetor 10 sufficiently heated by the
hot air from the exhaust, and the in
take manifold becomes so hot that Il
cannot be touched. There is a knock
in each cylinder whom the engine pulls
J hard with spark advanced.
You are driving with the spark I'D
vanced too far. Any motor will knock
when pulling hard with the spark ad'
vanced, as you have stated. The spark
lever should be retarded as the throt-
tie is opened, but only enough to stop
the motor knocking. If you will ex-
anime the interior of your motor you
will probably find that there Is not
enough carbon to cause a knock. We
would not advise mixing gasoline and
kerosene; you are likely to have vapor-
izing troubles. as the kerosene Is liable
| to be left in the .carburetor. The kerO-
| sene will not VapOriZe as readily as
| the gasoline and In short time your
doat chamber will be full of kerosene.
and then the motor will be obliged to
run ON the latter until the float cham
| Der Is emptied, when 1t will be filed
with the mixed fuel and the cycle will
be repeated. This variation In the quail
| ity of the fuel will result In poor car
buretion The saving that results from
adding such small percentage Of kero-
sene is not sufficient to make 1t worth
| the trouble.
Ny motor runs evenly when running
empty, but when pulling along on high
speed, with the motor throttled down,
the front cylinder misses. have done
everything | know of to correct this.
Can you suggest something?
| Provided you are certain that 1t IL
the front cylinder, we would advise
making a thorough inspection Of the
ignition. Examine the spark plug for
small cracks and see that the points
are about one thirty second inch apart.
Look over the wiring to this plug once
! more for bare insulation and inspect
the timer to see that proper contact Is
made See that there are no air leaks
around the manifold connection and be
sure that the valves are not warped.
| | have trouble in short circuiting.
have put on an all new magnetic cable,
! but il goes through anywhere il hap
pens to touch any metal. Can il be that
the magnetic 10 too strong7
! The probable reason for the current
/ leaking is that the insulation is not
heavy enough. or 1t has become worn
in places where it has rubbed against
the metallic surfaces. Possibly the
! leak Of current occurs at the point at
which the wires pass through the fiber
block over the exhaust manifold. 1t
would also be well to note If this block
is properly in place.
If can Of gasoline is exposed to the
air long enough for noticeable part Of
il to eVaporats will the remaining gas
cline be any weaker than il was at
first2
When gasoline is exposed to the air
and allowed to evaporate the specific
gravity of the remainder of the liquid
Increases, and. while the fuel value re
mains about the same, 1t is harder TO
start motor with 1t. Gasoline Is n
mixture of great many petroleum
oils differing slightly in their speciti"
gravity, and when this mixture is al
lowed to evaporate slowly greater
proportion of the light oils is taken up
by the atmosphere. and thus what is
left becomes heavier and heavier, and
as the specific gravity increases 1t
, makes starting harder
Is there such thing as a high COM
preston or low compression motor /?
If so, what 10 the advantage of low
compression motor7
Motors have been constructed with
compression pressure varying all the
way from nothing at all up to several
hundred pounds. Roughly. motors with
a compression of over seventy pounds
are generally considered to have high
compression and engines with less than
fifty-fve pounds low compression. Yet
the terms are purely relative and have
no exact meaning. A low compression
motor will run slower and more smooth.
ly at slow speed than a high compress
sion one. 1t is not so likely TO knock
when the cylinders are carboniZed, nor
will 1t overhead so readily. The pres
sures generated are not as great. and
therefore the parts do not need to he
made so strong, The high compression
engine, on the other hand, Is more eff
Client and develops a greater power for
given piston displacement.
My car cannot go up any kind Of
grade on high. After getting IL all over
hauled the same trouble is found. Some
people claim the spray nozzis in the
earburetor 10 at fault. What do you
think il can be2 II
The size of the fuel nozzle on the
carburetor seems TO be incorrect. and