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Engine Compression

  1. Warm engine to normal operating temperature. Remove all spark plugs. On Navajo, use remote starter switch to crank engine (DO NOT crank engine with ignition switch). On all other models, disconnect ignition coil primary wire connector.
  2. On all models, hold throttle plate fully open. Crank engine, and note compression pressure.
COMPRESSION RATIO

Application Specification
B2200 8.6:1
B2600i 8.4:1
Miata
Auto. Trans. 9.4:1
Manual Trans. 9.0:1
MPV
2.6L 8.4:1
3.0L 8.5:1
MX-3
1.6L 9.0:1
1.8L 9.2:1
MX-6
2.0L 9.0:1
2.5L 9.2:1
Navajo 9.0:1
Protege
DOHC 9.0:1
SOHC 8.9:1
RX7 9.0:1
323
California 9.3:1
Federal 9.0:1
626
2.0L 9.0:1
2.5L 9.2:1
929 9.2:1
COMPRESSION PRESSURE SPECIFICATIONS

Application Specifications
Compression Pressure
B2200 173 psi (12.2 kg/cm2 ) @ 300 RPM
B2600i 182 psi (12.8 kg/cm2 ) @ 270 RPM
Miata 192 psi (13.5 kg/cm2 ) @ 300 RPM
MPV
2.6L 185 psi (13.0 kg/cm2 ) @ 280 RPM
3.0L 164 psi (11.5 kg/cm2 ) @ 300 RPM
MX-3
1.6L 185 psi (13.0 kg/cm2 ) @ 300 RPM
1.8L 192 psi (13.5 kg/cm2 ) @ 300 RPM
MX-6
2.0L 171 psi (12.0 kg/cm2 ) @ 300 RPM
2.5L 203 psi (14.3 kg/cm2 ) @ 250 RPM
Navajo (1)
Protege
DOHC 182 psi (12.8 kg/cm2 ) @ 300 RPM
SOHC 173 psi (12.2 kg/cm2 ) @ 300 RPM
RX7 100 psi (7.0 kg/cm2 ) @ 250 RPM
323 192 psi (13.5 kg/cm2 ) @ 300 RPM
626
2.0L 171 psi (12.0 kg/cm2 ) @ 300 RPM
2.5L 203 psi (14.3 kg/cm2 ) @ 250 RPM
929 213 psi (15.0 kg/cm2 ) @ 270 RPM
Minimum Compression Pressure
B2200 121 psi (8.5 kg/cm2 ) @ 300 RPM
B2600i 142 psi (10.0 kg/cm2 ) @ 280 RPM
Miata 135 psi (9.5 kg/cm2 ) @ 300 RPM
MPV
2.6L 142 psi (10.0 kg/cm2 ) @ 280 RPM
3.0L 121 psi (8.5 kg/cm2 ) @ 300 RPM
MX-3 142 psi (10.0 kg/cm2 ) @ 300 RPM
MX-6
2.0L 119 psi (8.4 kg/cm2 ) @ 300 RPM
2.5L 142 psi (10.0 kg/cm2 ) @ 250 RPM
Navajo (1)
Protege
DOHC 128 psi (9.0 kg/cm2 ) @ 300 RPM
SOHC 121 psi (8.5 kg/cm2 ) @ 300 RPM
RX7 79 psi (5.5 kg/cm2 ) @ 250 RPM
323 135 psi (9.5 kg/cm2 ) @ 300 RPM
626
2.0L 119 psi (8.4 kg/cm2 ) @ 300 RPM
2.5L 142 psi (10.0 kg/cm2 ) @ 250 RPM
929 157 psi (11.0 kg/cm2 ) @ 270 RPM
Maximum Variation Between Cylinders
Miata, Protege & 323 28 psi (2.0 kg/cm2 )
Navajo (1)
RX7 21 psi (1.5 kg/cm2 )
All Others (2)
(1) Measurement of lowest cylinder must be within 75 percent of highest cylinder.
(2) Information is not available from manufacturer.
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