Evening capital news. (Boise, Idaho) 1901-1927, 1919-04-13
ANSWERS QUESTION ABOUT
TWO CYLINDER MACHINE

Gin October. 1917, purchased a
oaAoh roadstef. was bothered at
iHs. Win OIL pumping past the pis-
TONS, Wetting the plugs until they would
snort 10 correct this / installed a
patented ring in the top groove of each
piston with another type of patented
ring III the middle groove, leaving the
common eccentric ring in the bottom.
AS further preventive, we drilled a
row OF small holes around the piston
heads. rms corrected the oil pumping
out did not prevent a soft spongy sub
stance from forming on the valves and
seats, which would cause the engine
to miss after running 500 or 600 miles
thinking this trouble might be caus-
! ed through some defect in the carbllr
eter, | sent the carbureter to the fac
tory, receiving a new one in exchange
have run but about 500 miles since
the engine was cleaned and the new
carburetor installed, but have the same
misfirins. Nos. 2 and 3 cylinders are
always the offenders, l and 4 having
good compression.
III the piston as well as the rings on
Nos. and cylinders are worn and
need replacing, as the factory sug-
gests, why does not the gasoline work
past the rings on Nos. 2 and 8, thin
ming the oil in the crankcase? IF this
does occur, why does not the spark
plug on No. 4 cylinder foul, it being
the first to get the oil?
Would YOU not infer from that my
trouble is more likely to be caused by
an improper mixture, due to some in
herent fault of the carburetor, rather
than in the oiling system? AS a fur
Their indication of carburetor trouble
| find that at 90 m.ph. the car runs
splendidly and has good acceleration,
but slowing to 10 m.p.h. or below, it
is with the greatest difficulty that /
can get the speed back to q higher
point. This is particularly noticeable
when trying to negotiate a short grade
which l have no trouble taking when
the engine is clean. [ have had this
trouble ever since l have had the car.
R. T.
Aft the mixture is good in four
cylinders at 20 m.p.h., why would it
not be at all speed ranges? But there
may be leak between the manifold
and Nos. and 3 cylinders. This is
not at all unlikely. 1t appears as if
there is vast loss of compression In
these two cylinders, and that when
you get up ii 20 m.p.h. you take in a
sufficient charge of gas to make the
difference in running not so notice
able because of the momentum
1t is reasonably certain there is car
bon on the valves. This is carbon and
oil, and it shows that oil gets into
these cylinders, else it would not reach
the valves. The cylinders may be out
of round and this will cause loss of
compression the valves may need at
tention or may be worn SO they be-
come pocketed in the seat. 1t would
be good plan to try a gauge on each
cylinder to determine the amount of
compression each has. When the en-
CINE is running take a squirt can with |
light oil and squirt a little around each !
plug, printing cup. gasket and, in fact |
in all places where air could enter the |
cylinder on the suction stroke. If the |
engine runs good after being cleaned |
and the valves have been ground, the |
trouble coming later indicates a loss
of compression somewhere and this is
apt to come through carbon deposits;
the carbon from oil that creeps past |
the rings, due to the cylinders not be-
ing in proper shape.