Evening star. [volume] (Washington, D.C.) 1854-1972, 1930-07-13
Special Dispatch to The star.

Special Dispatch to The Star.
DETROIT, Mich, July 12.-Engine
design changes that will characterize
seasonal new models are being revealed
Details will continue to be made public
for three weeks, in the course of which
the same number of new lines of cars
have been scheduled for introduction.
Virtually all of them concern new
straight Fights on which production is
going ahead.
Summed up they bring to car opera
tors greater power from more cylinders,
added fexibility in driving, faster ac-
celeration and reduction of engine noise,
together with longer engine life.
The improvements are calculated to
eliminate certain faults that have been
charged to eight-cylinder power plants.
One is difficulty of carburetion in cylin-
ders No. ana No. 8. Because eight"
power plants use two cylinders more
than the SKIES and are therefore that
from carbon accumulation and "so0ting
up" at each end
New CarburetiOn.
From this, the models Of the present
year have been largely freed by the
adoption of improved manifolds. The
new motors coming now, however, and
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changes in them, have gone another
step ahead in banishing 1t. This tn
wolves use of duplex" or dual carbure-
ion, which virtually means two carbure-
tors in one.
This mechanism has two outlets for
The fuel mixture, each Of which car
ries 1t to a separate intake. One intake
feeds the inner group of four cylinders,
while the other supplies the remaining
four. Thus, the one carburetor is given
what engineers call a double throat"
and more uniform distribution is
achieved.
Combined with the "downdraft"
principle, whereby gravity is made to
expedite fuel combustion, certain en-
gineers claim that fuel efficiency Is i'm
proved from IL to Is per cent.
What has been termed power roar"
IN straight Fights also has been under
research by the engineers. While not
an unpleasant noise, power roar made
itself audible during spurts Of accelera-
ton and also at speeds above IS mites
an hour Experimental work in the lab
oratory and on the highway located the
cause Of it not in exhaust, where most
noises of this nature have originated,
but in the intake.
Noises Eliminated.
Accordingly, intake silences or muf-
fiers have been devised. AS now ap-
piled, these devices dampen out the
noise and keep it from "telegraphlng'
through the chassis to parts Of the
body that in some models have ampli-
fed it until it became offensive. With
all-steel type bodies, the silencers will
have real job.
A third progressive step that engi-
neering will bring into practice on new
car designs is oil cooling or tempera-
ture regulation. The extensive adop-
ton of oil coolers this year was fore
cast at the recent Summer assembly
of the Society of Automotive Engineers
at French Lick, Ind.
In one ADDRESS delivered during the
sessions, it was predicted that oil COOL
ers will be as popular as oil filters in
the near future Meantime" this
engineer added, dependence will be
placed upon aluminium crank cases and
oil pans with maximum ability for air.
cooling the oil"
Improved Cooling.
New oil coolers soon to be seen will
consist Of a chamber mounted outside
the crankcase, through which all the