AIRCRAFT SPARK PLUGS QUICK REFERENCE
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R - Resistor Erosion Protection.

What size is the spark plug lead nut?
E - 5/8"-24 plug lead nut size (uses 3/4" wrench) or H - 3/4"-20 plug lead nut size (uses 7/8" wrench)

What length is the reach of the plug?
M - 1/2" plug reach (short) or B - 13/16" plug reach (long)
This is the length of the threaded part of the spark plug that screws into the cylinder.

What is the heat range needed of the plug? Cold 26 - Hot 50.
40 - heat range of plug
Common heat ranges 32, 36, 37, 38, 40. Normally, a hot plug is used in a cold
engine (low horsepower), and a cold plug is used in a hot engine (high horsepower.)

E or BY - Massive electrode type or S - Fine wire electrode type
Any combination of massive and fine wire plugs can be mixed as long as they are approved for your engine. E plugs are standard two electrode massive. BY plugs have nickel twin electrodes and a projected core nose. They are used in engines to prevent lead fouling. Fine wire electrodes have iridium wire welded to electrode tips and last much longer than massive electrode plugs.

Part Number Explanation
Example: REM40E
REM40E PART NUMBER BREAKDOWN
REM40E Spark Plug Part Number Breakdown
MOST COMMON CHAMPION AIRCRAFT SPARK PLUG APPLICATION
Aircraft Engine Model Standard Massive Electrode-Shielded 5/8"-24 ----- Standard Massive Electrode-Shielded 3/4"-20
TELEDYNE CONTINENTAL MOTORS
A-65, A-75 REM40E View Price RHM40E View Price
C-75, C-75, C-90, C-115, C-125 REM40E View Price RHM40E View Price
C-145 REM38E View Price RHM38E View Price
E-165, E-185, E-225 REM40E View Price RHM40E View Price
O-200-A, -B, -C REM37BY View Price RHM40E View Price
O-200-A, -B, -C REM40E View Price
IO-240 REM38E View Price RHM38E View Price
GO-300-A, -B, -C, -D, -E, -F REM40E View Price RHM40E View Price
O-300-A, -B, -C, -D, -E REM38E View Price RHM38E View Price
IO-360-A, -AB, -C, -CB, -D, -E, -G, -GB, -H, -HB, -J, -JB, -K, -KB REM38E View Price RHM38E View Price
IO-360-B REM40E View Price RHM40E View Price
TSIO-360-A, -AB, -B, -C, -CB, -D, -DB, -E, -EB, -F, -FB, -G, -GB, -H, -HB, -JG, -K, -KB, -LB, -MB, LTSIO-360-E, -EB, -K, -KB REM38E View Price RHM38E View Price
O-470-A, -E, -J, -K, -L, -R, -S REM40E View Price RHM40E View Price
O-470B, -G, -H, -M, -N, -P REM38E View Price RHM38E View Price
O-470-T, -U RHB32E View Price
IO-470-C, -G, -P, -R, -T REM38E View Price RHM38E View Price
IO-470-J, -K REM40E View Price RHM40E View Price
IO-470-D, -E, -F, -H, -L, -M, -N, -S, -U, -V, -VO, -LO RHB32E View Price
IO-520-A, -B, -BA, -BB, -C, -CB, -D, -E, -F, -J, -K, -L, -M, -MB, -N, -NB RHB32E View Price
TSIO-520-A, -B, -BB, -BE, -C, -CE, -D, -DB, -E, -EB, -F, -G, -H, -J, -JB, -K, -KB, -L, -M, -N, -NB, -P, -R, -T, -U, -UB, -V, -VB, -WB, -AE, -AF, LTSIO-520-AE RHB32E View Price
GTSIO-520-C, -D, -E, -F, -G, -H, -K, -L, -M, -N RHB32E View Price
TSIO-550-A, -B, -C RHB32E View Price
IO-550-A, -B, -C, -D, -E, -F, -G, -L, -N, -P, -R RHB32E View Price
TEXTRON LYCOMING
O-235-C, -E, -H REM37BY View Price RHM40E View Price
O-235-F, -G, -J Fine Wire Electrode-Shielded 5/8"-24 ----REM38S
O-235-K, -L, -M, -N, -P REM37BY View Price RHM38E View Price
O-320-A, -C, -E REM37BY View Price RHM40E View Price
O-320-B, -D, -H REM40E View Price
AIO-320, LIO-320-B, IO-320-B, -C, -D, AEIO-320-A, -B, -C, -D REM38E View Price RHM40E View Price
IO-320-A, -B, -D, -E REM40E View Price
AEIO-320-E REM37BY View Price RHM40E View Price
IO-320-C, -F, LIO-320-C (Long Reach) REB37E View Price RHB37E View Price
O-340-A REM38E View Price RHM38E View Price
O-340-B REM40E View Price RHM40E View Price
O-360-A, -C, -E, -F REM38E View Price RHM40E View Price
IO-360-B, -E, -F, -H, -L REM38E View Price RHM40E View Price
AEIO-360-B, -C, -H, HO-360-A REM37BY View Price RHM38E View Price
O-360-B, -D REM37BY View Price RHM40E View Price
IO-360-A, -C, -D, -J, LIO-360-E REM37BY View Price RHM38E View Price
LO-360-A1G6D, O-360-E1A6D REM40E View Price
LO-360-E1A6D REM38E View Price RHM40E View Price
LO-360-C REM37BY View Price RHM38E View Price
IO-360-A, IO-360-C1F REB37E View Price RHB37E View Price
AIO-360-A REM38E View Price
LIO-360-C, AEIO-360-A REM37BY View Price RHM38E View Price
TO-360-A1A6D, TO-360-C1A6D, TO-360-E, TO-360-F1A6D, LTO-360-A1A6D, LTO-360-E REB37E View Price RHB32E View Price
GO-480-B, -D, -F REM38E View Price RHM38E View Price
GO-480-C, -G (Short Reach) REM38E View Price RHM38E View Price
O-540-A, -D, -E, -F, -G, -H, -J, -J3A5 REM38E View Price RHM38E View Price
O-540-B REM40E View Price RHM40E View Price
IO-540-A, -B, -E, -G, -K, -L, -M, -P, -S, -U (Short Reach) REM38E View Price RHM38E View Price
IO-540-C, -D, -J, -N, -T, -V REM40E View Price RHM40E View Price
AEIO-540-D, -L REM38E View Price RHM38E View Price
IO-540-AA, -E, -G, -J, -K, -M, -P, -R, -S, -U REB37E View Price RHB37E View Price
O-540-L3C5D, M1B5D (Long Reach) REB32E View Price RHB32E View Price
TIO-540-A, -C, -E, -F, -G, -H, -J, -K, -N, -R, -S, -T REB37E View Price RHB37E View Price
TIO-541-A, -E REB32E View Price RHB32E View Price

CHAMPION AIRCRAFT SPARK PLUGS AVAILABLE IN FOUR (4) PACKS

REM37BY-4PK 4) Spark Plugs 5/8-24 View Price Champion
REM38E-4PK 4) Spark Plugs 5/8-24 View Price Champion
REM40E-4PK 4) Spark Plugs 5/8-24 View Price Champion
RHB37E-4PK 4) Spark Plugs 3/4-20 View Price Champion
RHM38E-4PK 4) Spark Plugs 3/4-20 View Price Champion


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