Reply To: compression readings for 1957 Fastwin 18

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January 9, 2019 at 2:30 pm #162470
LLOYD LAUTNER
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    As usual, I agree with Mumbles. I have numerous OMC 18’s and 120 psi is just right for that motor. They will idle and run great with anything over 110-115 psi. Never seen or heard of one with 150 psi. Be sure to double check it yourself cold and dry with no added oil in the cylinders.