The sun. [volume] (New York [N.Y.]) 1833-1916, 1916-01-02

In the matter Of smoothness, the twin
four has "A discernible superiority at
moderate speeds. because Mt these speeds
the more even torque shows to ad-
vantage.
But at the higher engine speeds the
advantage switches to the six cylinder
motor because of the lack of balance In
the -four cylinder principle as compared
to the six. The disadvantages Of the o u
In this regard are retained In the eight
to an appreciate extent and at high
speed become dlspleasingly apparent In
spite Of the lighter pistons and shorter
crankshaft.
Tho twin four has another inferiority
to the ak as concerns accessibility. as
the 90 degree angle at which the cylin-
| ders are mounted makes II impractical
to place the generator. water pump and
such auxiliaries In the usual place.
| alongside the crankshaft and just In
side the frame. This equipment must
be mounted either below the frame or
between the cylinder blocks. the first
disposition being obviously inaccessible
and the second in the valve alley"
making the valves themselves relatively
Inaccessible. In turning radius too the
twin four suffers somewhat. In requiring
a wide frame to allow the steering gear
TO pass the wide angle Of the cylinder
construction.
All things considered II Is plain that
along with the acknowledged advantages
derived from the twin four reappear
those characteristics OF the original four
which the six was designed to overcome.
The logical advance from the twin
four is the win six type Of motor,
since It preserves the theoretical and
practical balance OF the six and by the
use Of smaller pistons and cylinders re-
49, -.
tain dissa~tisfactions with the six.
II Is clear that the torque Of the twin
six motor must be 100 per cent. better
than the single six. Six power strokes
per crank shaft revolution blend together
SO closely as to make II impossible to
distinguish any pause between them,
even at very low engine speeds, as when
pulling through traffic on up grades. Its
operation can best be likened to the &C.
ton Of steam. In weight the twin nix
motor Is lighter than the single six. and
so far as accessibility Is concerned Is
quite as satisfactory.
The so degree included angle at which
the cylinders are set allows the placing
of equipment In the usual place along
side Il. and between II the frame, ever
permitting Il narrowed foreframe and
making possible a chassis with shor,
turning radius. Only tho carbureter need
be set beween the cylinders. and by plac-
ing 1t we'll above the motor valve alley
II left entirely open n all valves are
easily accessible.
Aside from the structural advantages
with this type OF motor its superiority
In performance IS SO pronounced as "a
make IL q most significant factor In mo.
tor development. II Is more nearly than
all others the perfect result that all au.
tomobile engineers would attain In abil'
ity. smoothness and Hence. Its perfec,
balance. its lighter parts. the higher
compression possible and the improved
carburetion due to uniform suction re
suit in noticeable gasolene and oil econ
omy to the user. And because its actor
Is uniformly smooth at all speeds and II,
torque consistently even a similar econ
omy Is affected in the case Of tires.
OF course actual service 10 the onl,
real test Of n motors se~rv!ceability. ant