1992 Mazda 929FACTORY OEM SERVICE PROCEDURE

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 at specified cranking speed.
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
Non-Turbo 8.6:1
Turbo 7.8:1
Navajo 9.0:1
Protege
DOHC 9.0:1
SOHC 8.9:1
323 9.3:1
626
Non-Turbo 8.6:1
Turbo 7.8:1
929 9.2:1
COMPRESSION PRESSURE SPECIFICATIONS

Application Specifications
B2200
Compression Pressure 173 psi (12.2 kg/cm2 ) @ 300 RPM
Minimum Compression Pressure 121 psi (8.5 kg/cm2 ) @ 300 RPM
Maximum Variation Between Cylinders (1)
B2600i
Compression Pressure 182 psi (12.8 kg/cm2 ) @ 270 RPM
Minimum Compression Pressure 142 psi (10.0 kg/cm2 ) @ 280 RPM
Maximum Variation Between Cylinders (1)
Miata
Compression Pressure 192 psi (13.5 kg/cm2 ) @ 300 RPM
Minimum Compression Pressure 135 psi (9.5 kg/cm2 ) @ 300 RPM
Maximum Variation Between Cylinders 28 psi (2.0 kg/cm2 )
MPV
Compression Pressure
2.6L 185 psi (13.0 kg/cm2 ) @ 280 RPM
3.0L 164 psi (11.5 kg/cm2 ) @ 300 RPM
Minimum Compression Pressure
2.6L 142 psi (10.0 kg/cm2 ) @ 280 RPM
3.0L 121 psi (8.5 kg/cm2 ) @ 300 RPM
Maximum Variation Between Cylinders (1)
MX-3
Compression Pressure
1.6L 185 psi (13.0 kg/cm2 ) @ 300 RPM
1.8L 192 psi (13.5 kg/cm2 ) @ 300 RPM
Minimum Compression Pressure 142 psi (10.0 kg/cm2 ) @ 300 RPM
Maximum Variation Between Cylinders (1)
MX-6
Compression Pressure
Non-Turbo 162 psi (11.4 kg/cm2 ) @ 270 RPM
Turbo 139 psi (9.8 kg/cm2 ) @ 260 RPM
Minimum Compression Pressure
Non-Turbo 114 psi (8.0 kg/cm2 ) @ 270 RPM
Turbo 98 psi (6.9 kg/cm2 ) @ 260 RPM
Maximum Variation Between Cylinders (1)
Navajo (2)
Protege
Compression Pressure
DOHC 182 psi (12.8 kg/cm2 ) @ 300 RPM
SOHC 173 psi (12.2 kg/cm2 ) @ 300 RPM
Minimum Compression Pressure
DOHC 128 psi (9.0 kg/cm2 ) @ 300 RPM
SOHC 121 psi (8.5 kg/cm2 ) @ 300 RPM
Maximum Variation Between Cylinders 28 psi (2.0 kg/cm2 )
323
Compression Pressure 192 psi (13.5 kg/cm2 ) @ 300 RPM
Minimum Compression Pressure 135 psi (9.5 kg/cm2 ) @ 300 RPM
Maximum Variation Between Cylinders 28 psi (2.0 kg/cm2 )
626
Compression Pressure
Non-Turbo 162 psi (11.4 kg/cm2 ) @ 270 RPM
Turbo 139 psi (9.8 kg/cm2 ) @ 260 RPM
Minimum Compression Pressure
Non-Turbo 114 psi (8.0 kg/cm2 ) @ 270 RPM
Turbo 98 psi (6.9 kg/cm2 ) @ 260 RPM
Maximum Variation Between Cylinders (1)
929
Compression Pressure 213 psi (15.0 kg/cm2 ) @ 270 RPM
Minimum Compression Pressure 157 psi (11.0 kg/cm2 ) @ 270 RPM
Maximum Variation Between Cylinders (1)
(1) Information is not available from manufacturer.
(2) Measurement of lowest cylinder must be within 75 percent of highest cylinder.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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