Engine Compression
Test compression with engine at normal operating temperature, spark plugs removed, all injector connectors and cold start valve disconnected, throttle valve fully open and engine at cranking speed (300 RPM).
COMPRESSION SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Compression Ratio | ||
| Maxima & 300ZX | 9.0:1 | |
| 300ZX Turbo | 7.8:1 | |
| Normal Compression Pressure | ||
| Maxima & 300ZX | 173 psi (12 kg/cm2 ) | |
| 300ZX Turbo | 165 psi (11 kg/cm2 ) | |
| Minimum Compression Pressure | ||
| Maxima & 300ZX | 128 psi (9 kg/cm2 ) | |
| 300ZX Turbo | 121 psi (8 kg/cm2 ) | |
| Max. Variation Between Cylinders | 14 psi (1 kg/cm2 ) | |