Evening capital news. (Boise, Idaho) 1901-1927, 1919-03-30

IHoo bLE in capital letters is the price
you pay for carelessness on this score
100 much oil Is not particularly gooo
Tor the engine, but 1t is not nearly sc
harmful as an under supply.
From careful observation and tests
made 1t has been found that an engine
operating in a field can be completely
worn out in from sixty to ninety days
OF service IL the carburetor air intake
Is not protected.
The reason is simple. The piston on
the suction stroke pulls to such an eX-
tent on the restricted air passage
through the carburetor pipe that par
tai vacuum is created In the combus-
ton chamber This has tendency to
cause the oil to flow up past the rings
into the combustion chamber, just as
it does the gasoline through the car
buretor.
The result is that the dust passing
into the combustion chamber through
the unprotected air intake mixes with
this lubricating oil and forms a fine
grinding compound, causing undue
wear on the cylinders, pistons and pis-
ton rings. Finally 1t works down into
system to the bearings, seriously i'm
pairing the engine.
This point is a factor in the life of
the automobile engine, too, with the
result that air filters for automobile
engines are now on the market. How
ever, the better housing Of the automo-
bile engine as compared with the trac-
tor motor and the higher speed of the
former, have tended to minimize the
dust question, with the result that trac-
tor manufacturers, taking their cue di-
rectly from automobile practice, We're
neglectful in the beginning on this
score.
However, the application of a proper
almost as essential to the life of the
tractor engine as proper lubricating
oil, and where both are employed the
very best results In the way of good
service and long life can be expected
Coming back again to the matter of
cooling and overlooking in order to
make more vivid the i'll effects and
withal the fallacy Of the latter:
Suppose, as we did before, that the
engine develops its best pulling power
-torque-at 900 revolutions minute
and that this corresponds to a tractor
speed of three miles an hour. This
means that if the tractor is pulling
three bottoms it must maintain a speed
Of three miles an hour. If with three
bottoms the tractor is overloaded so
that the engine speed falls off to 800
revolutions per minute, it is evident
that the tractor speed must also fall
off to two miles an hour. Since the
power developed by the engine depends
largely on the number of revolutions it
makes in a minute, it is evident that
at the lower speed it Is not going to
develop as much power by large mar
gin as at full speed.
Now. suppose you Immediately on
this condition pulled off one
Of the bottoms, thus relieving the en-
CINE of it's overload. Your engine would
speed up again, likewise your tractor,
and you would pillow your land as quick
~ with two plows at three miles an
hour as with three ploWs at two miles
per hour, and without straining the
engine and impairing its usefulness.
And your fuel consumption with the
two plows would not be as great as
With the three, for the simple reason
that the engine was designed to oper-
ate economically at 900 revolutions per
minute. At lower speeds there is a
arge waste of heat and fuel.
These are absolute facts which any
ractor operator can determine for him
self without a great deal of trouble.
In conclusion, it is perhaps we'll to
warn the tractor operator against talk
ng it for granted that there is suffi-
cient lubricating oil in a new tractor
Much injury has been caused through
the belief that everything is in proper
shape and starting the engine without
conditions fully.
1t is better to spend an extra gallon
Of oil on new engine than to feed n
barrel of oil after the engine has suf
cred damage.-American Automobile
Digest.