The Bosch 7993 spark plug is a direct OE replacement for the Porsche 912 (1965-1969) with the 1.6L H4 engine. It features a nickel‑yttrium center electrode and a tapered ground electrode for consistent ignition and long service life. This plug helps restore original performance and fuel efficiency in classic 912 models.
Key Features & Benefits
- Nickel-Yttrium center electrode: Durable material for extended service intervals.
- Tapered v‑profile ground electrode: Enhances flame kernel growth for more complete combustion.
- Pre-gapped at 0.7mm: Simplifies installation—no manual adjustment needed.
- Ceramic insulator: High thermal and electrical resistance for reliable operation.
- OE heat range 6: Matches original thermal characteristics of the 1.6L engine.
Vehicle Fitment
| Make | Model | Years | Engine |
|---|---|---|---|
| Porsche | 912 | 1965–1969 | 1.6H4 |
Technical Specifications
| Part Number | 7993 |
| Thread Diameter | 14mm |
| Hex Size | 20.8mm |
| Reach | 12.7mm |
| Seat Type | Crushable |
| Resistance | 6000 ohms |
| Center Electrode Material | Nickel-Yttrium and Copper |
| Ground Electrode Tip Material | Nickel-Chromium |
Installation Notes
Professional installation recommended; ensure proper torque.
This part also goes by the following cross reference.
Cross Reference Part Number:
Fits These Vehicles
| Make | Model | Engine | Years |
|---|---|---|---|
| Porsche | 912 | 1.6H4 | 1965–1969 |