in my MOTOR imported repair manual from 1981 for compression specs. it says for any mercedes from 72 to 81 the cranking compression should be 313 to 331 with a minimum of 213 psi. now were up to the years for 21.5 to one compression ratio.

i thought of another reason for higher cranking pressure for the newer motors... better rings and better metal.

more food for thought.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.