Question piston ???

[Mach]

Ya tu quelqu'un qui c'est si ma compression est normal ou trop basse !!

135-130-130-130

________
WRX 2002

[Rick Hunter]

~130 seems fine. If there's a large difference (more than 15-20) between cylinders, then that's an indication that the piston rings are going. You're fine.

[Kolia]

Voila ce que j'ai trouvé...

Compression (350 rpm and fully open throttle):
Standard: 951 — 1,147 kPa (9.7 — 11.7 kgf/cm2, 138 — 166 psi)
Limit: 834 kPa (8.5 kgf/cm2, 121 psi)
Difference between cylinders: 49 kPa (0.5 kgf/cm2, 7 psi)

[Rick Hunter]

It also depends on if the engine was hot/warm/cool/cold.