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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.
  1. Warm engine to normal operating temperature. Remove all spark plugs. Disconnect ignition coil primary wire connector.
  2. 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
(1) Difference between cylinders should not be more than 28 psi (2.0 kg/cm2 ).