Evening star., 1922-06-25
To the Automobile Editor; !;

To the Automobile Editos:
Have a six cylinder car and
ever since purchased 1t have had
trouble: with the valves careorising
! have just had the cylinders re-
bored and new piston rings put IN.
The oil Is always at its proper level
and yet I cannot drive over couple
Of hundred miles when this occurs
again and the valves have to be
ground. In other words. I have to
grind them about every 200 miles.
Can you tell me what 10 causing this!
know that little oil will get In
the combustion chamber and then IT
should burn up clean. but it does not
seem to do this. II you will advise
me in regard to this I shall appre-
ciate 1t. Il. Z.
Answer.-It is possible that the ex-
haust valves are timed late. This
would prevent the cylinders from
scavenging properly. Sometimes q
cIoRged muffier will cause lot of
trouble in that the exhaust gases. by
not having a free exit through the
muff1er. create a back pressure.
The design of some motors Is sucn
that carbonization cannot be prevent
ed. If this is the case with your car
it is almost impossible to overcome 1t,
the matter up with the makers OF the
car-possibly they can recommend
some remedy.
II the valves are timed right and
the ignition right and you are using
high-grade oil, 1t certainly should not
every 200 miles. You might try low
erins the oil level a little more.
Som etimes this is necessary to pre-
vent flooding the cylinders
To the Automobile Editor:
have an old touring car. four cyl
inders. In country running the car
fifteen miles. VIII you please advise
the approximate quantity OF gasoilne
which is consumed in one hour when
car is at a standstill with motor run
ming and your gas lever retarded
Answer-To answer your questiom
can approximately estimate the Il. r.
NJ. of the motor under both conditions
you have outlined, then you can more
accurately figure the gasoline CON
sumption. When idling the motor
should turn over very slowly, ahd' VI
course, consume very little Iuel.
To the Automobile Editor:
viii you please be SO kind as to ten
me whether a machine has more pow
er going backward or forward!
II the gear ratio of the first speed
md the reverse are the same there ls
no difference. This was true IN the
older types where the same gear was
used for both positions. the reverse
pinion giving the change OF direction,
meshing with the forward gears ior
the reverse. In present designs the
reverse gear on the countershaft ls
smaller than the forward drive anu
so gives an increase of power OF ~ or
Is per cent. This is worth knowing.
as car Is sometimes so heavily
loaded that it cannot make hill on
low speed. By sending 1t up back
ward the feat can be accomplished.
To tho Automobile Editor:
Can you give me little fnfofmA. .
tion as to why my engine misses II
high speed? 1t will run fine as long
as do not crowd 1t over twenty-five
m,les per hour. 1t also misses on the
hills and 1t will not hit all cylinders
when running idle. 1t hits them all
when starting. but misses aDoVe
twenty-five miles. 5. n. +.
Missing in some Of the cylinders
OF causes. II 1t occurs at high en-
zine speed it may be due to improper
action OF the interrupter points. which
NAV need adjustment or stronger
spring. If 1t occurs at low engine
speed 1t may be due to faulty car
buretor adjustment or air leaks IN
the manifold II there is q slight
stoppaEe Of the gasoline line It Will
cause missing at high speed: Be sure
40 as to eliminate that as one OF
the possible causes.
n. +ba Automobile Editor: