Check compression with engine warm, all spark plugs removed and throttle wide open. Crank engine through 6 compression strokes per cylinder.
| Application | Specification | ||
|---|---|---|---|
| Compression Ratio | |||
| Coupe GT, 4000S & 4000S Quattro | 8.5:1 | ||
| 5000S | 8.0:1 | ||
| 5000 Turbo | 8.3:1 | ||
| Compression Pressure | |||
| All Non-Turbo | |||
| Normal (New Engine) | 131-174 psi (9-12 kg/cm 2 ) | ||
| Minimum | 102 psi (7 kg/cm 2 ) | ||
| Turbo | |||
| Normal (New Engine) | 100-131 psi (7-9 kg/cm 2 ) | ||
| Minimum | 72 psi (5 kg/cm 2 ) | ||
| Max. Variation Between Cylinders | |||
| All Non-Turbo | 44 psi (3 kg/cm 2 ) | ||
| Turbo | 28 psi (2 kg/cm 2 ) | ||
COMPRESSION SPECIFICATIONS