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Old 29 July 2012, 13:00   #1
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Country: UK - England
Town: Lingfield
Boat name: Hot fish
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My rib is a 1999 Picton Cobra diesel inboard rib 'flying fish' , powered by a Volvo KAD32-PA. After some weeks of renovation, we managed to get out on the Solent yesterday . she will rev to 3000 at WOT in gear , and 3200 in 'neutral'. The GPS gives a max of between 29 and 30 knots over the course of around 6 hrs. Electrically all seems well with a supercharger cutting in around 1500 rpm and out of around 2650 rpm. She gets onto the plane quickly but seems to run into a premature 'buffer' around 3000rpm. The online specs seem to suggest I should expect another 1000rpm at least. I have had both engine and leg serviced last month with new Volvo props as per originally fitment. I have replaced supercharger clutch, throttle sensor, control box and kick down switch so far. There is some black smoke on start up for about 45secs from cold - suspect this is expected. She is doing around 1 litre of diesel per 1nm . If I move the throttle at the helm , it looks like I hit the throttle stop at the engine as expected . The bottom is clean with fresh antifoul. Has anyone any ideas if I should be expecting more rpm or performance , and could any one recommend a Solent ( Chichester?) based Volvo marine engineer ? We berth at Chichester Marina.
With thanks,
Richard Williamson
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Old 29 July 2012, 15:26   #2
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Lack of fuel, although I would have still expected full rpm in neutral?
What revs do you achieve if revving the engine actually at the engine?
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Old 29 July 2012, 16:50   #3
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Country: UK - England
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Make: Humber Sport Pro
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Quote:
Originally Posted by chewy
Lack of fuel, although I would have still expected full rpm in neutral?
What revs do you achieve if revving the engine actually at the engine?
Not noticed any difference ( in neutral) from manually moving throttle rod vs throttle lever. Have changed both fuel filters ( Twice since May) and no effect. Wondered if throttle stop could be adjusted and also have part of workshop manual which describes a pipe from inlet manifold to throttle body which only allows full fuelling if turbo fully spooled up so as to prevent excess smoke at low rpm. Haven't found it yet on the engine, but it might be loose or perished. I'm Unsure how to test if turbo actually working - supercharger should disconnect around 2800rpm to leave turbo to do the work at higher speeds.
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Old 29 July 2012, 16:56   #4
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Warren, WB Marine based in Chichester marina, the yellow sea start rib by the lock, he used to do mine, he's busy but a good person to know if you've got an inboard.
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Old 29 July 2012, 16:58   #5
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Thanks - I have seen his van so might well ask him for help if I get stuck.
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