Engine Compression
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1998 Mazda Protege, 1998 Mazda Millenia, 1998 Mazda MPV, 1998 Mazda B4000, and 1998 Mazda B3000. 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 | |
|---|---|---|
| B2500 | 9.2:1 | |
| B3000 | 9.0:1 | |
| B4000 | 9.0:1 | |
| Millenia | ||
| 2.3L | 10.0:1 | |
| 2.5L | 9.2:1 | |
| MPV | 8.5:1 | |
| Protege | ||
| 1.5L | 9.4:1 | |
| 1.8L | 9.0:1 | |
| 626 | ||
| 2.0L | 9.0:1 | |
| 2.5L | 9.5:1 | |
COMPRESSION SPECIFICATIONS
| Application | Minimum psi (kg/cm2 ) @ RPM | Standard psi (kg/cm2 ) @ RPM | |||||
|---|---|---|---|---|---|---|---|
| B2500 | N/A | (1) | |||||
| B3000 & B4000 | N/A | (1) | |||||
| Millenia (2) | |||||||
| 2.3L | 121 (8.5) @ 250 | 164 (11.5) @ 250 | |||||
| 2.5L | 132 (9.3) @ 300 | 189 (13.3) @ 300 | |||||
| MPV | 121 (8.5) @ 300 | 164 (11.5) @ 300 | |||||
| Protege (2) | |||||||
| 1.5L | 146 (10.3) @ 300 | 195 (13.7) @ 300 | |||||
| 1.8L | 139 (9.8) @ 300 | 185 (13.0) @ 300 | |||||
| 626 (2) | |||||||
| 2.0L | 119 (8.4) @ 300 | 171 (12.0) @ 300 | |||||
| 2.5L | 141 (9.9) @ 250 | 203 (14.3) @ 250 | |||||
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