Champion:
N=14mm
"9" or "61"=heat range
R=resistor
Y=projected nose
C=copper (at the end)
The double digit "60" indicates a series
of plug within a heat range of their own
"kind". These look like the standard plug
except the ground electrode is slightly shorter in it's longest travel,
convering
only 1/2 the top surface of the center
electrode rather than fully covering it
as in the "standard" plug. They're "cut
back" for better propagation of the "flame".
These are normally recommended in
Special Tuning specs.
The higher the number, the hotter the
plug whether it be single or double digit
series.
NGK's work heat range the other way. Higher is colder.
B=14mm
P=projected
R=resistor
6=heat range
ES=standard tip (copper)
EV="v" cut center elecrode (copper)?
EVX= " (platinum)?
I=iridium
The question marks are there cause it
starts getting quite complex and I am not
sure at all about these but, NGK plugs have more endings than most cats
have kits.
Best thing is to go down to local parts
store and read the beginning of each
mfg's spark plug catalog to get a handle
on it.
Cap'n. Bob
'60 :{)
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