97 speedster, 3 people in boat, full throttle starting out it revs up to 6800 and won't get on plane, If I ease into it up to 5500 it pops right out. Replaced the wear rings with oem ones and boat does same thing at wide open starts. I can pull up two tubes with no problem when I ease into it. Is this normal? or should it come out at wide open throttle? What else is there to check? Props look good, top speed of around 50. thanks.
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Normal cavitation?
- Thread starter krautdog
- Start date
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I do not know what seal type is on the shaft of our boats, but if yours are bad it will suck air from inside the hull and create a cavitation issue.
You used the word RINGS, do you have twin engines? I ask for a reason,,
What is the clearance from the impeller to the wear ring? Should be no bigger than a dime.
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You used the word RINGS, do you have twin engines? I ask for a reason,,
What is the clearance from the impeller to the wear ring? Should be no bigger than a dime.
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Next question was going to be if one engine revs up faster than the other,,,
In all my years of boating I have never found it a requirement to come out of the hole with the throttles pegged.
For most things, once I got a strain on a skier or a tube I accelerated to about 2/3 and that was sufficient.
If possible, you want to prevent maxing out your engine under a heavy load, it will prolong the life of the engine.
All that said, due to the weight ration vs the engine horse power, with my skink can floor it and back it off literally 2 seconds later and I am at 40 MPH. No harm done.
Having twins in your boat I would think you could do the same. Maybe not at 2 seconds or to 40 MPH, but I think you get my point.
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In all my years of boating I have never found it a requirement to come out of the hole with the throttles pegged.
For most things, once I got a strain on a skier or a tube I accelerated to about 2/3 and that was sufficient.
If possible, you want to prevent maxing out your engine under a heavy load, it will prolong the life of the engine.
All that said, due to the weight ration vs the engine horse power, with my skink can floor it and back it off literally 2 seconds later and I am at 40 MPH. No harm done.
Having twins in your boat I would think you could do the same. Maybe not at 2 seconds or to 40 MPH, but I think you get my point.
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I do exactly as you say for pulling tubers and skiers and general taking off, I was just curious if it should come out of the hole at w.o.t or is it normal when you apply full throttle for it to cavitate. I would think it to be normal especially with 3 adults in the boat,but just wanted to be sure something wasn't causing the issue. Thanks for your quick replies.
I suppose cavitation is the proper word. I just don't like it in your case as I am thinking with a loaded boat and three adults it is literally a traction issue more so than a cavitation issue where water is slipping by the impeller and not being used. I think you are pushing water well but the boat/load is heavy and you new to get some movement before you get good traction.
Anytime you have an engine and some sort of a drive, be it tires, impeller or a propeller, there will be a point where the load is higher than the normal performance for the engine/drive. I think with your boat and three adults you are hitting this magical number.
Technically it should not hurt to come out if the hole WOT. The reality is, If something fails it is normally very expensive/catastrophic in regards to a repair.
If you MUST be WOT then do so. If not, for normal use I would try to keep it at 2/3 max to get the boat moving, once moving you can increase throttle as the working load will be greatly reduced. Which means the over-all load on things such as your impeller and engine will also be greatly reduced. Which will increase the life if said items.
Make sense?
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Anytime you have an engine and some sort of a drive, be it tires, impeller or a propeller, there will be a point where the load is higher than the normal performance for the engine/drive. I think with your boat and three adults you are hitting this magical number.
Technically it should not hurt to come out if the hole WOT. The reality is, If something fails it is normally very expensive/catastrophic in regards to a repair.
If you MUST be WOT then do so. If not, for normal use I would try to keep it at 2/3 max to get the boat moving, once moving you can increase throttle as the working load will be greatly reduced. Which means the over-all load on things such as your impeller and engine will also be greatly reduced. Which will increase the life if said items.
Make sense?
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Yes makes sense. That is exactly how I drive it. And traction makes sense, I was going to use that term as well. This question arose when my buddy drove it and mashed it wide open to start out and he had to back off to get traction 
Sounds like everything is working as should. Thanks.
Sounds like everything is working as should. Thanks.- Status
