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Champion 91 Spark Plug
| Brand | Champion 91 |
|---|---|
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Non-removable nut |
| Center Electrode Tip Material | Nickel |
| Pre-Gap Size | 0.035 |
| Pre-Gap Size | 0.91 |
| Ground Electrode Quantity | 1 |
| Insulator Height | 0.06 |
| Manufacturer Heat Range | 14 |
| Seat Type | Flat |
| Reach | 0.438 |
| Thread Diameter | 0.551 |
| Thread Diameter | 14.000 |
| Resistor Type | No |
| Hex Type | Hex |
| Center Electrode Diameter (Inch) | 0.09 |
| Classification | Champion agricultural plugs |
| Ground Electrode Material | Nickel copper alloy |
| Hex Size | 0.813 |
| Hex Size | 20.650 |
| Installed Height (Inch) | 2.24 |
| Insulator Projection (Inch) | 0.06 |
| Plug Type | H14y |
| Taper Diameter (Inch) | 0.31 |
| Product line | Copper Plus |
| Fits | Jeep · 4 vehicles |
Copper Plus design. Built for dependable ignition in high-temperature, high-load service.
Nickel electrodes. Helps deliver consistent spark performance with durable metal tips.
Flat seat spark plug. A straightforward replacement for secondary ignition applications.
Cross-references Champion Spark Plug 436, 43LS and AL52 for the same application. See all 5.
Champion Copper Plus 91 Spark Plug
Champion Copper Plus 91 is an industrial and agricultural spark plug built for high-temperature, high-load service. It uses nickel center and ground electrode materials, a flat seat, and a 0.035 in pre-gap to support consistent ignition performance in demanding engines.
Compatible With 1965-1968 Jeep Wagoneer applications, this Champion spark plug is listed for non-resistor, OE-type service. The Champion Copper Plus line focuses on practical ignition performance with copper-based construction and proven electrode design for equipment and vehicles that need dependable spark delivery.
Key Features
- Champion part number 91
- Champion Copper Plus spark plug line
- Nickel center electrode tip and nickel ground electrode core
- Nickel copper alloy ground electrode material
- 0.035 in pre-gap for OE-style ignition setup
- Non-resistor design
- Flat seat with 14 mm thread diameter
- H14Y plug type
- Compatible With 1965-1968 Jeep Wagoneer, N/A
Product Details
This spark plug is engineered around a copper-plus construction with nickel electrode materials to support stable ignition in industrial, agricultural, and older vehicle applications. The 14 heat range, 0.438 in reach, and flat-seat design align with the listed OE-style fitment for Jeep Wagoneer models from 1965 through 1968. Champion part number 91 is also cross-referenced to Champion Spark Plug 436 for the same application.
Common Issues It Can Address
- Hard starting caused by worn or fouled spark plugs
- Misfire from inconsistent spark delivery
- Rough idle related to degraded ignition performance
- Loss of throttle response from weak combustion
- Service replacement for aging OE-style plugs in Jeep Wagoneer engines
Installation Notes
Verify the plug type, thread diameter, reach, seat style, and heat range before installation. The pre-gap is listed at 0.035 in, so confirm engine specifications and adjust only if the application calls for it. Use the correct torque procedure for flat-seat spark plugs and inspect ignition wires, cap, and coil condition during service.
Quality Assurance
Champion backs this spark plug with global engineering from Federal-Mogul. The Copper Plus design is built for service in demanding temperature and load conditions, with materials selected for durable secondary ignition performance.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1968 | Jeep | Wagoneer | 5.3L | V8 | N/A | Non-Resistor Type; OE Type; Gap 0.035 (in); Plug Type Number H14Y; Copper Plus |
| 1967 | Jeep | Wagoneer | 5.3L | V8 | N/A | Non-Resistor Type; Gap 0.035 (in); Actual OE Part; Plug Type Number H14Y; Copper Plus |
| 1966 | Jeep | Wagoneer | 5.3L | V8 | N/A | Non-Resistor Type; Gap 0.035 (in); Actual OE Part; Plug Type Number H14Y; Copper Plus |
| 1965 | Jeep | Wagoneer | 5.3L | V8 | N/A | Non-Resistor Type; Gap 0.035 (in); Actual OE Part; Plug Type Number H14Y; Copper Plus |
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