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STITTSpark Plug Company
STITTSpark Plug Company
®®
Conroe, TexasPhone: 936-756-7796 • 281-443-2279
Outside Texas: 800-231-8006Fax: 936-539-9762
www.stitt-sparkplug.c [email protected] om
IgnitionControlModule
(Magneto )
IgnitionStep-Up
(Transformer)Coil
Lower VoltagePrim ary Wiring330 - 380 Volts
Highe r VoltageSecondary Wiring>1000 Volts - Open
Circ uit Voltage(Nominal 38,000)
Basic Ign ition Circuit
STITT S-R107-2 Spark Plug
Schematic ofCeramic Insulator
Construction
Terminal Po st / Center Ins ulatorConduc ting Ro d
High T emperature Copper and Bo rosilic ateGlass Non-Resistor or Bo rosilic ate Glass
and Resistor Sealing Mat erial
Nickel Center Electrode and SteelLocking N ut
High T emperature High Die lectricAlum ina Oxide Insulator
High TemperatureGas-Tight Seal Zones”
B
B
CA
A. Center Ins ulator Bo re SealB. Bottom Internal S eat Gasket / Steel Shell To Insulator Seal Gasket
C. Folded Steel External S eat Gasket
CompletedSpark PlugSchematic
Termi nal Nut
Internal Rod
Ceramic Ins ulator
Safety Restraint
Steel Shell
Copper Glass or Resistor Bore Seal
Steel Nut
Cent er Electrode
Shell To Insulator Seal Gasket
Ground Ele ctrodes
Bottom Internal Seat Gasket
Material
Nic
kel 2
11
Silv
er
Pal
ladi
um
Pla
tinum
Nic
kel
Iro
n
Gol
d
Co
pper
Gol
d -
Pal
ladi
um
Allo
y 80
0 (F
E-N
I-C
R)
SA
E 1
117
Ste
el
304
Sta
inle
ss S
teel
Gra
y C
ast I
ron
Alu
min
um A
lloy
390
Tun
gst
en
Irid
ium
Rat
e O
f T
rans
fer
(W
/m•K
)450
400
350
300
250
200
150
0
100
50
Fastest
Slowest
Comparison Of Material The rmal Tra nsfer Rates
.015" = 15 kv300 microseconds
.020" =
.025" =
20 kv200 microseconds
25 kv100 microseconds
Voltage Requiremen ts
(Appro ximate Values)
Spark Plug Life in High Excess Air / Long SparkDuration, Low NOx, Low CO Ignition
(22 - 45 Crank Angles)
Nickel Ground ElectrodesNickel Center Electrodes
.034 sq. inches of Spark Gap Surface Area
500 - 800 hrs..015" - .050"
Nickel Ground ElectrodesAuPd Center Electrodes
.020 sq. inches of Spark Gap Surface Area
1500 - 2000 hrs..015" - .050"
AuPd Ground ElectrodesAuPd Center Electrodes
.020 sq. inches of Spark Gap Surface Area
6000+ hrs..015" - .025"
1L2262Hrs.Yes
2L3262Hrs.No
3L2862Hrs.Yes
3L-B400Hrs.No
4LUnknown
Hrs.Yes
5LUnknown
Hrs.Yes
6L3262Hrs.No
1R3262Hrs.No
2R3262Hrs.No
3R3262Hrs.Yes
4RUnknown
Hrs.Yes
5R2750Hrs.Yes
5R-B512Hrs.No
6R3262Hrs.No
Over Torqu ed
Shell StretchedAway From Internal
Seat Gasket CausingLeakage.
Normal Torqu e
Shell Torque dProperly . Seat Gasket
Remains Tight .No Leakage.
IgnitionControlModule
(Magneto )
IgnitionStep-Up
(Transformer)Coil
Lower VoltagePrim ary Wiring330 - 380 Volts
Highe r VoltageSecondary Wiring>1000 Volts - Open
Circ uit Voltage(Nominal 38,000)
Basic Ign ition Circuit
STITT S-R107-2 Spark Plug
RFI Spectrum A nalys isHigh Ohm ic Value Spark Plugs With Regular S park Plugs
60
50
40
30
20
10
0
bB (
uV/m
)
30 40 50 60 70 80 90 100
200
300
400
500
600
700
800
900
1000
Engine Operating Wit h 827’s 01/30/86
Engine Operating Wit h U827’s 02/24/86
Frequency (MHz)
RFI Spectrum A nalys isAmbient RFI Noise Levels
60
50
40
30
20
10
0
bB (
uV/m
)
30 40 50 60 70 80 90 100
200
300
400
500
600
700
800
900
1000
Ambient RFI Engine Not Operating 01/03/86
Engine Operating Wit h U827’s 02/24/86
Frequency (MHz)