Engine Compression
WARNING: This page is about a different car, the 1994 Mazda MX-6 and 1994 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
- Warm engine to normal operating temperature. Remove all spark plugs. Disconnect ignition coil primary wire connector.
- Hold throttle plate fully open. Crank engine, and note compression pressure.
COMPRESSION RATIO
| Application | Specification | |
|---|---|---|
| MX-6 | ||
| 2.0L | 9.0:1 | |
| 2.5L | 9.2:1 | |
| 626 | ||
| 2.0L | 9.0:1 | |
| 2.5L | 9.2:1 | |
COMPRESSION SPECIFICATIONS
| Application | Minimum psi (kg/cm2 ) @ RPM | Standard psi (kg/cm2 ) @ RPM |
|---|---|---|
| 2.0L | 119 (8.4) @ 300 | 171 (12.0) @ 300 |
| 2.5L | 142 (10.0) @ 250 | 203 (14.3) @ 250 |