Dhadley

hwsiii

Commander
Joined
Jan 25, 2009
Messages
2,639
I have noticed you say before in a posting that some motors do better at higher RPM than at the manufacturers recommended RPM. I am trying to understand why this is true. Many years ago I was with a friend and we had been trolling for about five hours at low RPM with his boat that had a 135 evinrude on it, as we picked up to run to the island he just jammed the throttle to wide open and the engine did screw up because of coking in the cylinder. I always thought it was because of all the trolling we had done and I had told him to take it easy going to WOT because of this. But apparently I may have been wrong, as it appears that you are advising that some engines need higher RPM to run well.
Is there a simple explanation for this so I can understand. With my limited knowledge of engines I can't see the advantages of running some motors at higher RPM than are recommended, I can see the disadvantages but I would like to understand the advantage and reasoning. I need to increase my knowledge on this subject, as I said earlier I am not a mechanic type person and don't understand the reasoning. I am NOT trying to be contentious, just trying to LEARN and gain more knowledge.

H
 
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