hello this is my first forum, can you please help me , i live tasmania , i purchased a 13bt { jap import deisel }i was told it was a " bu" series 84/ 87 , can any one tell me the compression ratio for the 13bt engine , i was told it is not the same as the 3b. the 3b series manual gives specs of 427psi for both models, the 13bt uses a low compression piston 17.6.1 ratio on the same crank as the 3b, how does that translate into the same compression psi spec . i had my motor rebuilt top to bottom ran well , then after 4000klm it started loosing power it does not use any oil , no smoking at all , reco injector pump , new fuel inj , turbo tested, just done a compression check and all 4 cylinders are only 250 psi , i noticed on the end of head gasket lip it had a number 160 on it , any ideas would be appreciated , thank you


