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Engine Compression

  1. Warm engine to normal operating temperature. Remove all spark plugs. 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
Miata 9.0:1
COMPRESSION SPECIFICATIONS

Application Minimum psi (kg/cm2 ) @ RPM Standard psi (kg/cm2 ) @ RPM
Miata (1) 128 (9.0) @ 300 182 (12.8) @ 300
(1) Difference between cylinders should not be more than 28 psi (2.0 kg/cm2 ).
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