NGK Platinum Plug Number LTR7CP13 Spark Plug - 94862
NGK Racing Plug Number R7438-9 Spark Plug - 4656
NGK Iridium Plug Number LMAR9AI-8D Spark Plug - 90526
Autolite Iridium XP Spark Plug - XP985
Product
Attributes
Warranty
Seat
Tapered
Flat
Gasket
Gasket
Thread Size
M14-1.25
M14-1.25
M10-1.0
M14-1.25
Heat Range
7
9
9
7
Hex Size (mm)
16mm
----
14mm
16mm
Hex Size (in)
5/8 Inch
5/8 Inch
----
5/8 Inch
Preset Gap (in)
0.052 Inch
0.028 Inch
0.032 Inch
0.034 Inch
Preset Gap (mm)
1.3mm
0.7mm
0.8mm
0.89mm
Thread Reach (in)
0.984 Inch
1 Inch
1.043 Inch
0.750 Inch
Resistor Plug
----
Yes
----
Yes
Center Electrode Core Material
Copper
Copper
Copper
Nickel
Center Electrode Tip Material
Platinum
Iridium
Iridium
Iridium
Approximate Resistor Value (Ohm)
5000 Ohm
5000 Ohm
5000 Ohm
4000 Ohm
Insulator Height (mm)
52.5mm
50mm
51mm
50.5mm
Insulator Height (in)
2.070 Inch
1.990 Inch
2.010 Inch
1.988 Inch
Ground Electrode Tip Material
----
Platinum
Nickel
Platinum
Thread Reach (mm)
25mm
26.5mm
26.5mm
19.05mm
Service Number
LTR7CP13
R7438-9
LMAR9AI-8D
----
Metallurgy
Platinum
Iridium/Platinum
Iridium
Iridium/Platinum