Discussion in 'Boating Discussion' started by stickandstay, Sep 8, 2016.
Any feedback would be appreciated. Volvo 290 dp is bolted to it
Thanks in advance. Stickandstay
Have 2350hrs on mine hooked up to zf gears. Besides standard maintenance and standard wear items they have been good to us. That being said I would never own another Volvo turbo/supercharged engine again. Basically you loose all use of any rpm range while the supercharger is engaged due to fuel consumption and noise. So 1450-2800rpm is worthless.
not sure what you mean by. 1450-2800 is worthless
What he said ! 2500 hrs on mine. The supercharger makes the rpm range useless because you should not run the engine in the 1550- 2750 range for extended period of time. Fuel consumption yes, bigger issue is that the supercharger creats a tremendous load on the circulation pump shaft. It will have a tendency to destroy it. Ok engines they are maintenance intensive to say the least. You will also destroy the 290 drive. It should be matted to the more robust DPG Drive. And don't run the stainless props. Look up un sprung weight, and its effect on bearings and gears.
Briggs. So I imagine you've installed a switch to shut off your supercharger while running at those rpms ?
I don't think you can. Blowers (superchargers) are either gear or belt driven.......at least on gas engines. It would have to have a clutch of some sort, eh?
(sorry, I'm pretty new to this, but hoping to learn some stuff cause I'll soon be in the market for a used boat with a Volvo diesel engine.....please help educate me)
On the EDC Volvo Engines KAD 44/300 you cannot instal a switch to shut the supercharger off. You will dump fuel and potentially burn a piston. I have adjusted prop size as to not overload engine and give me the speed I need while cruising and or trolling. Even that does not allow a cruise speed of say 12 kts.
More like 7.8 kts at 1500rpm and 15-16.5 kts at 2750. My end of day speed at 3000rpm gives me 22.2 kts. Plenty fast enough. Pm me if you would like to talk more about it!
From my understanding the computer has a fuel curve that it works against. Something about the RPM AIr Fuel mixture. The electronic switch for the supercharger is soley an RPM based system. Hence they are independent of one another.
So if you shut the charger down your dumping excessive fuel with out the airflow.
On the mechanical fuel pumps 41-43 series there is no computer to automatically adjust fuel delivery hence mechanical vs electronic.
Hope this helps
Pretty frustrating knowing that repower options for our diesel boats are upwards of $30G on the low end and $60+G on the upper end
Arguably your 43 is the best Engine Volvo has produced!!!!
Other than HP, what would be the better motor. KAD 44 or KAD 300 ?
yes, the supercharger has a clutch, like an AC unit - cuts in or out depending on RPM
Those gaps in Rpm usage sound really limiting. I could not live with that.
Find a old 6v71 DD who needs fuel economy or the ability to hear...
The 300 does'nt lend itself well to trolling do to the SC wanting to cycle on and off at lower speeds. just have to settle for a little slower troll than I would like sometimes, and you would not want to hear that thing whine for long periods which I dont think is good for the system, Another quirk of these motors is that they love to eat belts. So keep em on hand.
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