Reply With Quotehi we have 150 etec running 17 pitch and our wot is around 5400 i think 5300 would be fine you could ask the question on the etec forum as you would get more responses .http://www.etecownersgroup.com/
Mate of mine just put a full depth pod on his Yalta 189 and attached an Etec 150HP which has done 300 hrs or close. It achieves 5300rpm WOT and is doing 74kmh at that.
Prop is 14.75 x 17pitch. I would be happy with that, but he thinks it should rev out to 5500 rpm. My question is are you happy with those revs at WOT or would you re prop?
Me thinks going back to a 15 would not be necessary.
Thoughts??
John
"let not he boast who puts his armor on, as he who takes it off"
hi we have 150 etec running 17 pitch and our wot is around 5400 i think 5300 would be fine you could ask the question on the etec forum as you would get more responses .http://www.etecownersgroup.com/
560c Bar Crusher "Overtime"
was he fully trimmed out with not much load in the boat at 5300? max RPM should be at full trim. With my boat I gain 200-300rpm withonly a few degrees of trim out
What was the motor running like before the pod? I'm asking to tell if the motor is 100% running well and reving out to correct WOT.
Check your motor heights as a first option .
You really need to get the correct WOT revs for the year model motor so check the book.
The correct design prop will put the loading on the motor at the correct rev ranges.
Basic rule is never run a 2 stroke overloaded so it can't make WOT. They need to make WOT.
I think it is always better to reach max RPM because not reaching it is putting extra load on the engine and you may not get the best performance.
But before he goes out and worries about the prop size, be sure that the engine height is correct and not running too deep and trimmed correctly. Often with a pod the engine needs to be raised somewhat but depends on the design of the pod. If it is running too deep now then lifting it may give you 200RPM but more likely about 100RPM.
With the boat running on flat water and at a brisk cruise speed someone needs to carefully look over the back and determine the Cav plate level in the water stream. It should be just skimming the surface or close to it in most cases.
If that looks good and no cavitation or porpoising then the height is probably OK.
If it is expected to have more weight in the boat over time and you plan on heading offshore then the situation will just get worse and I would consider repropping.
Went through the exercise myself recently and ended up replacing the 17" with a 15" and the boat feels better for it, quicker out of the hole and more resposive when required plus just more consistent heading uphill and downhill at sea.
Two questions
1, how far back is the new mounting point from original position the transom?
2. is the cavitation plate on the engine in the same position as it was prior to the hull improvement?
If you have gone back 1 foot from the transom , then lift the engine till the cav plate is 1.75 - 2 inches above the bottom most point of the pod ( on a full depth pod).
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