Tulsa daily world. [volume] (Tulsa, Indian Territory [Okla.]) 1905-1919, 1918-03-17

,cct II. have gonio ono push tho ,ar
along and II Rnv grinding noiao ~
heard ia the brlios they should be
adjusted.
The subject ot wind resistance
brings an 10 tho body Al normal
speeds, NJ course the shape OF tho
hodv ~ ~ llttlc cffert but for fagt
work tho strchmllnc type Of body
iE the thing, Avoid ns much as pos
hihlo fiat surfaces Especially II
this true Of tho cars rear iiave
the body HS narrow us possible and
smooth sidcd Such n body does not
absorb much mower At high speeds
Cr Ia head winds Place aa many Of
the fittings, pumps. etc ne you rRn
on thc inside 10 keep resistance down
You can reduce IN. resistance Of the
front axle by placing piece OF tri-
angular section wood In the channel
aud tapping II In place In tho shnls
way the Ito rod and drag link can
lie strengthened bv tapping . picce
of nnrle-irun over tltcm.
II you wan, the car for high speed
only " may pRv 10 Tighten the NY
wheel, witch sometimes will givc
quicker accelern Inc power but the
cur viii not run 80 veil "a low speed
II YOU can afford IT,, nubstltutH Il
steel flywheel for the cast Iron Otc
Or N" latter can he turned down In
IA Ipthc ana n steel 'lng shrunk on
~ the reCiprOchtlug parts the
plstons como first In importa FOR
very hiGn speeds they can be reduced
In diameter TO prevent binding
ANin they can hs lightencd b>
dtillinR or substituting aluminium
alloy 'ight nrny iron or steel pis-
tons, Tho inter must be made very
accurately and fitted 10 prevent
SELLING They can be mad1 tnJertnE
having sny from COOS 10 COOS
Inch clearance vt the top nnh tap-r-
ing Ia about 0.002 inch from the
wrist pin down. II cast iron pis-
tons are used. thcv sometimes can
hc reduced IN wclsht by nrchining
the Interior, cutting them of slight
ly or drilling holes In them
~ pistonS are drilled 20 grew
extent considerable more oil may
he necessary at hiGh engine Rp"o's
Really the best thing 10 10 lf the
owner wants To reduce piston weight
Ia 90 take the matter up with come
concern Specializing In this work and
III the plst9ns recommended by such
com paniosD
Valve Port Areas
IL happens sometimes that there
In a notable falling or In power at
n certain speed 1ftor lighter plStons
hnVe been fitted. This In because
the valve port areas nre too amoli "a
take care OF the added volume uf
lnrushing gases Larger veAvcs and
ports afford remedy and will De
discussed further m. should Stcrl
pistons he fitted and the latter hove
n tendency 90 warn under ex esSi \ e
| heat they should no taken put and
| the high spots eased off. ~ course
rs tho clearance II Increase the on
sine mnY not perfprm we'll Cntl 4,
becomes heated and the clearance
normal
In Tightening the connecting rods
all the cutting away should bo re-
stricted 60 tho web and wristpin end
| for II In the reclprocntinE parts that
must bs reduced In weight. A fam.
Qua race driver once said he would
rather add 20 pounds to tho chassis
that ounce To the pistons or con
Meeting rods. pistons and connect.
inc rods must weight exactly the
same The weight distribution thru-
out the length OF tho rods must he
| Identical as otherwise the engine
will bo out uf balance.
Existing conditions will dictate ~
a great extent Just what can he dons
| TO make ths valves more efficient
If possible the intake valves should
he made larger and the eXhAustH lef'
alone. aE nowadays the chief AMI
Guilty IL 10 E~t the ans into the cylin
ders The burnt gases. ms rule
act about H. YOU might as woll In
crease the latter also.
7 " the same valves are 20 he ased
the aperture below them may bc an
larred by cuttiny away portions o
the seat The objection TO this Il
that II leaves onY marrow fact
and the valve soon burns out.
g0od procedure la to cut away IN,
metal. FROM under the valve hend
This leaves face OF sufficient widti
and gives the gases = better flow.
PORTION OF the flllet also can be Gu
away. but take care not to wePkei
the valves. obviously the vRlNc
should be ground In 30 they seat per
fectly A good plan, too, Is to n
stronger springs. ana 10 preVrn
binding In the guides at high ~. ed
tho stems OF the exhauats should b'
slightly diminished.
opinion is more or less divided ~