Re: How Important is OMC Ignition Timing?

[legendre]

quote legendre:

quote VinTin:

Would it be a correct assumption that max motor output would be achieved by setting the timing just before the onset of spark knock? I’d like to get the max out of my 57 35hp OMC but of course don’t want to cause engine damage. I understand that spark knock is difficult to hear in a wide open outboard motor. Thoughts?

Per my understanding, general theory states that, for a given RPM, more advance = more torque, so long as it’s not causing spark-knock / detonation. But there are a lot of variables and there’s no way to simply say that more advance will or will not benefit your engine.

If you want to play, I’d trial & error it.. while watching cylinder head temperatures (if possible) and frequently checking the plugs. A higher octane fuel will also tend to tolerate more advanced timing. +Shrug+

ETA: Not sure how I managed this, but I’ve tried to delete the post several times. System says I can’t.