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Old 25 March 2007, 10:09   #11
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Originally Posted by jwalker View Post
Yeh, I know, I mentioned that in my first post.
Oh yeah, couldn't be arsed to read every detail of the thread. I leave it to you duoprop experts. I'm more of a Mercruiser man myself.Apart from Bravo 3's.
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Old 25 March 2007, 18:07   #12
alt
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Hi guys,
Thanks for all the info, including the power curve! (Very cool!)

To clear some things up....
The boat weighs 1900KG
She gets onto the plane VERY quickly, no problems there. Once she hits 3000RPM she stops revving on
Turbo seems OK, no dodgy smoke
The last owner has had the boat in the water for over 12 months, there was no prop changing

She is due a full service, I guess that the fuel filter could be blocked up.

I am going to give her the full service (Oil, Filter, supercharger oil, crank breather, gearoil, air filter, anodes - Anything else im missing?) next week and will report back.

I think I should be moving down to the A4 props either way, as the boat weighs 1900KG. What I can't get over is that even with that weight, the boat planes VERY quickly, even with 4 people on board
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Old 25 March 2007, 18:16   #13
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You would think so but when I was setting up my boat I had exactly the same problem as Alt, but worse. I could only pull 2700rpm and flat out at 27knts. but it lifted onto the plane smoothly and easily. I agree though, checking everything else before spending money is a good idea.
Hi again j, firstly thanks for all the posts. I just spotted the above one. Seems to be my exact problem! Boat planes very easily and smoothly but just dies when she hits 3k. As said above, im going to give her a full service and see how she is then... Watch this space! (Well, next weekend anyhow!)
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Old 25 March 2007, 18:18   #14
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Originally Posted by alt View Post
Hi guys,
Thanks for all the info, including the power curve! (Very cool!)

To clear some things up....
The boat weighs 1900KG
She gets onto the plane VERY quickly, no problems there. Once she hits 3000RPM she stops revving on
Turbo seems OK, no dodgy smoke
The last owner has had the boat in the water for over 12 months, there was no prop changing

She is due a full service, I guess that the fuel filter could be blocked up.

I am going to give her the full service (Oil, Filter, supercharger oil, crank breather, gearoil, air filter, anodes - Anything else im missing?) next week and will report back.

I think I should be moving down to the A4 props either way, as the boat weighs 1900KG. What I can't get over is that even with that weight, the boat planes VERY quickly, even with 4 people on board
Umm, sounding more like an issue with the lump than props. It may need diagnosing after the oil/flter changes.
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Old 25 March 2007, 19:17   #15
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..She is due a full service, I guess that the fuel filter could be blocked up.
Could easily be the case.
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Old 26 March 2007, 03:17   #16
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Could easily be the case.
I suppose the chances that the tachometer is lying to me are slim? I say this because I notice that on idle, the engine seems to be happily turning over at 500RPM?!
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Old 26 March 2007, 03:32   #17
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Could easily be the case.
I think not, a blocked fuel filter would cause to stuggle right through the rev range and more so at low revs.
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Old 26 March 2007, 06:58   #18
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I think not, a blocked fuel filter would cause to stuggle right through the rev range and more so at low revs.
Would you like to explain your reasoning for that statement, Mr Moll?

Note point 6 taken from the Volvo manual.
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Old 26 March 2007, 07:19   #19
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I suppose the chances that the tachometer is lying to me are slim? I say this because I notice that on idle, the engine seems to be happily turning over at 500RPM?!
All things are possible. Service it before you do anything else. The tickover speed should be 675-725. Mine can have the tickover speed set from the EDC controls, yours may be similar. The method is in the Operator's Handbook.
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Old 26 March 2007, 10:40   #20
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Would you like to explain your reasoning for that statement, Mr Moll?

Note point 6 taken from the Volvo manual.
Experience Mr. Walker.
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