Hej Martin.
Ja det er ikke nemt at finde, håber det kan bruges.
Actually compression ratio for EW10J4S 177 hp RFK engine 11.0:1 and EW10J4 138 hp RFR engine 10.8:1.
180-210 psi
Values should be within 10% of each other.
If they are less than about 170 put a small squirt of oil into the cylinder and retest. An increase in pressure suggests worn rings and / or bores. No increase suggests valve seats or cylinder head gasket.