The Washington times., 1922-11-11
LATEST SPARK
P[UGSETTLES
FIRE TROUBLES
B. G. Proves Great Advance
Over Older lone Lung
Jumper"-The Details.

II Is surprising. but the average
motorist has been unconsciously
educated to expect trouble with his
spark plugs. Often a faulty spark
condition exists almost unsuspected
by the driver. because In a six or
eight-cylinder car one or even two
cylinders not firing are hardly
noticeable except by a slight de.
crease In power and pickup" The
reason why spark plug trouble so
often exists and why II is accepted
as necessary evil, is that some
plugs are essentially the same as
when the first Jump-spark system
was Installed In the "old one-lung-
ers."
The effect on the motor of faulty
ignition may be far.reaching. Many
a man had unJustly blamed a good
car for falling to give him proper
service, for being so often in the
repair shop and for showing. poor
gas and oil economy. A fouied or
missing plug causes dilution OF the
oil In the crank case, Door lubri.
cation and all the trouble incident
thereto.
Drag Of the Piston.
The drag Of the piston In the
cylinder not firing causes rapid
wear Of the bearings and the early
call at the service station or repair
shop. And the loss Of our power
subject the other cylinder to a heav.
Ter load and greater strain.
Some ordinary plugs carbonize.
Carbon Itself is a fine dry powder,
the product of incomplete combus-
tion. Carbon alone will not foul
plug. because a binder is required
to hold these carbon particles to-
gether. This binder is furnished by
the oil, which, splashing on the
plug insulator collects te carbon.
On the explosive stroke the heat
distills the larger portion of the oil,
leaving a sticky residue which col.
lects more carbon particles, and this
action continues until definite plug
failure occurs by the carbon path
offering SO little resistance that the
current flows over the surface of
the insulator instead Of jumping the
spark gap
This difficulty In overcome in the
b. @. Spark by using a restricted
orifice Just back Of the spark points,
the inside OF the plug forming a
primary explosion chamber, where
the small quantity Of fuel forced by
the compression stroke is thorough
ly vaporixed by the heat of the
parts. and the hot spot disk" form.
ing the orifice.
This gives inside the plug a hot,
dry gas which when the spark
occurs burns very rapidly and clean
ly. and projects a blast Of fire
through the orifice into the cylinder
charge giving complete ignition and
securing the insulat or and spark
points clean.
Acts With Lean Mixture.
This action takes place best with
a lean mixture. because in the pri.
mary explosion chamber the un.
combined globules OF oil and gaso-
line in the fuel are vaporized 10
that at that point the proper mix
ture for complete CONFUSION is
obtained. The spark flame" from
the primary explosion chamber will
thoroughly ignite the lean cylinder
charge and the large amount of air
in the lean mixture permits this
also to burn clearly and not with
the slow smoky. carbon producing
combustion OF the customary rich
mixture
This b. @. plug Is the result of
years OF study and investigation. 1t
will not do the impossible, but its
action under ordinary and unusual
motor condition will be a pleasant
surprise to the motorist who will
install II and make the simple ad.
tustment recommended on the di.
rectiona accompa nYinR each nluR