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Except RX7

  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 at specified cranking speed.
COMPRESSION RATIO

Application Specification
B2200 8.6:1
B2600i 8.4:1
Miata
Automatic Transmission 9.4:1
Manual Transmission 9.0:1
MPV
2.6L 8.4:1
3.0L 8.5:1
MX-6
Non-Turbo 8.6:1
Turbo 7.8:1
Navajo 9.0:1
Protege
DOHC 9.0:1
SOHC 8.9:1
RX7
Non-Turbo 9.7:1
Turbo 9.0:1
323 9.3:1
626
Non-Turbo 8.6:1
Turbo 7.8:1
929
DOHC 8.9:1
SOHC 8.5:1
COMPRESSION PRESSURE SPECIFICATIONS

Application Specification
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-6
Non-Turbo 162 psi (11.4 kg/cm2 ) @ 270 RPM
Turbo 139 psi (9.8 kg/cm2 ) @ 260 RPM
Navajo (1)
Protege
DOHC 182 psi (12.8 kg/cm2 ) @ 300 RPM
SOHC 173 psi (12.2 kg/cm2 ) @ 300 RPM
RX7 85 psi (6.0 kg/cm2 ) @ 250 RPM
323 192 psi (13.5 kg/cm2 ) @ 300 RPM
626
Non-Turbo 162 psi (11.4 kg/cm2 ) @ 270 RPM
Turbo 139 psi (9.8 kg/cm2 ) @ 260 RPM
929
DOHC 179 psi (12.6 kg/cm2 ) @ 300 RPM
SOHC 164 psi (11.5 kg/cm2 ) @ 300 RPM
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-6
Non-Turbo 114 psi (8.0 kg/cm2 ) @ 270 RPM
Turbo 98 psi (6.9 kg/cm2 ) @ 260 RPM
Navajo (1)
Protege
DOHC 128 psi (9.0 kg/cm2 ) @ 300 RPM
SOHC 121 psi (8.5 kg/cm2 ) @ 300 RPM
RX7 43 psi (3.0 kg/cm2 ) @ 250 RPM
323 135 psi (9.5 kg/cm2 ) @ 300 RPM
626
Non-Turbo 114 psi (8.0 kg/cm2 ) @ 270 RPM
Turbo 98 psi (6.9 kg/cm2 ) @ 260 RPM
929
DOHC 125 psi (8.8 kg/cm2 ) @ 300 RPM
SOHC 114 psi (8.0 kg/cm2 ) @ 300 RPM
Maximum Variation Between Cylinders
Miata, Protege & 323 28 psi (2.0 kg/cm2 )
Navajo (2)
RX7 21 psi (1.5 kg/cm2 )
All Others (1)
(1) Information is not available.
(2) Measurement of lowest cylinder must be within 75 percent of highest cylinder.
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