The Morning Tulsa daily world. [volume] (Tulsa, Okla.) 1919-1927, 1921-02-06

'''I"'I N' 'I'N NI''''I 'ffltH''Ifi A'IFlN ~
ulsf'Hpr1a production entirely
Hy n. \. TAitASTOtS
Mouber Society ~ Autnmotyr IN.
g,uogfH
Engineering progress has been
moro pronounced during 1920 In the
passenger automobile field than IN
any year In the past four Acc'ioi
alton of this progress was brought
about by IN" change boo relation
between supply and demand, so that
factories. which Tor some time hal
been iuFpirod by constantly ucroae-
ing production. htd tU divert murn
Of their attention TO chassis dc.
tolopmcnt, sadly neglected during
the period when peak production
dominated.
Tho number ~ passenger car
manufacturers actually engaged iu
building cars has increased from q
few above 100 iu 1919 To- lG2. These
manufacturers are marketing ,ttH
having an average prIr" close tn
$500 higher por tourug model man
the 1890 raI
An apalyaiB uf tho ears ~ 1921
shows thom 90 bo di8bppUiuiiuglN
heavier by slightly more than 100
pounds. they arc longer by two
inches, the average Whoclhasu hay
iug risen from llg 90 l2l. The
engine a slightly greater In dis
placement. the average bore and
stroke being 3 TIC hy ! ld-lG, the
engine speed has boon increased
and the powor output raised, 80 that
the average engine produces around
90 horsepower slightly In excess OF
= ESQ revolutions per minute, En
Klncs run smoother. due to hottct
balance of rotating and reciprocal
Ing parts, fuel economy has been
bcttrrcd, owing to a CluHcr study OF
feeding tn" gaseous mixture, cool
INK rs improved, luhricatiuu rs bot
ter by a remarkable degree, while
ignition has undergone little, II any
change. There has been notice
able gain ot L-hrad engines and
com parutiyo loss In overhead Nnlv"
types the disk nud plato clutches
have again scored a gain, the unit
power plant construction has lost
ground. together with the floatiug
axle, chassis and body details show
many changes for the better.
More Four cylinder Cars.
4 surprise is I'm store for those
who nave not closely watched tho
rour-cyllndcr engine, for It has
made "a gain Of about Z pcr ccn,
against "a comparative loss Tor the
siN-Cylindcr Tho eight cylinder has
gained slightly aud the twelve has
lost ground This has been brought
about by the increased number OF
manufacturers, many NJ whom SO.
lcCted the four-cylindcr engine. Tho
actual figures show there are more
skies than there were last ycar--SD,
as against 20 last ycar-.hut tn,
1921 list shows sc tuur-cS Slindct
cars, and compared with the total
number OF chassis offered by all
| manufacturers. this gives an In.
crease for the four and shows a loss
for the six There are II cigh.
cylinder chassis thls wear and three
l2-Cylindcr. This years figures
give no indication that the four
cylinder is going 10 Increase and,
as some predict become the stand
ard type. / believe there will be
moro clghts and skies and fewer
rours as the industry grows older
hut tho skies and cights must 50
be Designed that their maintenance
will be simple matter There II
little reason for the four. except itN
Usual lower fuel consumption and
lower maintenance, The American
owner must have smoothucss ur
running ocyCn torpucl though a
wide range, ana this cannot be givuu
| IN a four as In a SIX, eight ur u,
| As the industry continues the word
maintenance will he dominant and
| engines VIII be first attacked
/, Is difficult to see why the aver
| HnFlnR tlAAtlI a. a { a. o.
! than the last two years. We should
| be- working toward smaller engines,
not larger ones. Ii has boon show n
! that hN proper design We can rec
! duCc the engine size tts displnCc.
! mCut uu cubic capacity ot its cyl!u-
dersl and at the same time increase
the power torque and performance
characteristics. Il has been shown
In some passenger engines, hut
mot so torvCtully as In racing cu-
gincs, where cars of 1888 Cuht,
Inches displacement tFord is 1907
Dodge Is 2l2.3 cubic inChes) traNc
l2O miles per hour at normal rlCinl
speed show ten mtlos per gallon and
produce moro than 100 horse power
Even thoSc racing engines run qulct
lN, smoothly, and with the proper
gear ratio can bv handled like tour
Itng-Cur engines. mention this
merely TO show what can hc done
am not suggesting any such en-
Encs fpr passenger ears, hut merely
wish tn emphasize what is possible
with "a smnllcr engine, II the details
OF the design are worked out cure
fully
Engines this year are much bet
Ter, due especially to two things
better fabrication ana better bal
.auyr. The study OF thcso prubicm
ANA the Corrcdt sdluuun ~ them II
amy particular design are two of th,
'wusi difficult connected with cngln,
design Designers and cnEu,cr
have given $50 much moro study {,
balance because ut tho realization
that 30 is a major matter that ir
dozens ~ Cus-s changes In rrauk
shaft and vamahtft design, I'm p,s
tons and other parts, have beer
lmadc. Materials have been improve,
land Workmanship hrtrrcd, hovaus
these have a bearing ON engine bal
= lance.
Grant shafts Heavier.
=. 'ranhshu't- as % whole are ACuV
Y fer and suffer hruNusc II has brol
= found that tho sultcr the shaft tn
|, less the tendency to distortion. !
- Is this distortion which upsc,s IN
; shaft balance, lt % always woul
5 keep Us Erumrtr.u shape once hal
, anced % would remain $50, Hut uu
- fortunately the shaft lS acted upo
hN the forces OF tho tNulpsInns an