Engine Compression
WARNING: This page is about a different car, the 1994 Mazda Protege, 1994 Mazda MX-3, and 1994 Mazda 323. 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-3 | |||
| 1.6L | 9.4:1 | ||
| 1.8L | 9.2:1 | ||
| Protege | |||
| DOHC | 9.3:1 | ||
| SOHC | |||
| California | 9.3:1 | ||
| Federal | 9.0:1 | ||
| 323 | |||
| California | 9.3:1 | ||
| Federal | 9.0:1 | ||
COMPRESSION SPECIFICATIONS
| Application | Minimum psi (kg/cm2 ) @ RPM | Standard psi (kg/cm2 ) @ RPM | |||
|---|---|---|---|---|---|
| MX-3 | |||||
| 1.6L | 135 (9.5) @ 300 | 192 (13.5) @ 300 | |||
| 1.8L | 142 (10.0) @ 300 | 198 (13.6) @ 300 | |||
| Protege | |||||
| SOHC (1) | 121 (8.5) @ 300 | 173 (12.2) @ 300 | |||
| DOHC (1) | 128 (9.0) @ 300 | 182 (12.8) @ 300 | |||
| 323 | 135 (9.5) @ 300 | 192 (13.5) @ 300 | |||
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