Home › Forum › Ask A Member › QD-10 that runs horrible. Expert advice needed. › Re: QD-10 that runs horrible. Expert advice needed.
While I don’t put lots of hours on any of my motors in any year, I have always run my OMC 10s on 24:1. It is entirely possible that not everyone will agree with me on this practice.
I believe the most important thing to remember when operating a pre 1961 10hp is to make sure you are not overloading the motor. I have been told it should be able to turn around 4500 rpm at WOT. If it is only able to turn 4000rpm or less at full throttle that can cause preignition at full spark advance and the preignition is harmful to the engine. It is this that tends to hammer out the wristpin holes in the pistons of the 10s with the small wristpins. This was much less of a concern once the needle bearings were used on the wristpins.
-Ben
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