The Devils Lake world and inter-ocean. (Devils Lake, N.D.) 1915-1920, 1915-04-01
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In any gasoline motor, such as those used
in automobiles, three things must happen in
the cylinders in order to get the power to
make the automobile go. First, vaporized
gasoline must be introduced into the cylin-
der through a gate, or as We say, a valve.
Second, this gasoline vapor must be COM
pressed and then exploded with an electric
spark, and third, the useless gases which
result from the explosion must be expelled
from the cylinder through another valve.
Automobile engine cylinders are of three
types, the IL head, the "T' head, and the
valve-in-head. Now let's get these three
types firmly fixed in our minds. They have
been explained time and again, and yet there
are people, including thousands of automo-
bile users, who do not understand the fund
amental differences in the construction of
three types Of motors. Otherwise the Il
ad IT head types would be hard to sell, for
it can be mathematically demonstrated and
proven, in cold facts and figures, that the
valve-in-head motor will yield Is per cent
more power than the IL head, and 90 per
cent more power than the IT. head motor
of equal size, and for the same amount of
fuel. It is plain, therefore, that if every
purchaser of an automobile realized and
understood this truth no amount of sales
mems talk could create much of a market
for IL and ~ head motors.
"To help you understand why the valve
in-head is superior, l shall draw a very
much enlarged parallel. Perhaps by COM
pairing these forms Of motor construction
to some familiar object much larger than
automobile understanding entirely a.
part from motors can help you to under
stand. The non-mechanical mind is always
puzzled as long as the talk is confined to
engines, or motors, no matter how simple we
try to make it, so We will get entirely away
from mechanics for this magnifed compari-
son.
Everybody has walked down a hallway
IN a hotel, with rooms ranged along each
side. Now let's imagine ourselves in such
a hallway. We walk along toward the end
OF the hall and find all the doors leading
to the various rooms tightly closed. We
come to the end of the hall and find two
windows, also closed.
Now We will open the door of the last
room on the left, and leave it open. At the
far side of this room are two windows.
There you are-thcre's an Il head motor.
The hallway itself is the cylinder and the
room at the head of the hall is the valve
chamber, or pocket, as it is called. The two
windows at the far side of the room are
the valves, one an inlet valve and the other
an outlet valve. Air, to reach that hallway,
would have to come through the window of
the room, pass through the room, and thence
through the door into the hall. Same way in
an Il head motor. The gas enters through
the valve, passes through the valve cham
Der, or pocket, and then into the cylinder
proper.
"For a ~ head motor we would have to
extend the comparison by opening the door
on the opposite side of the hall also. A
T' head motor has two valve chambers,
or pockets, the intake valve being on one
side of the cylinder and the outlet valve on
the opposite side.
"And now, using this same comparison
to give you an idea of the valve-in-head
motor, we simply close the doors to the