| Philip_Fry |
| (regular) |
| 16/05/2008 14:39 |
Volvo D3 running speeds.
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Just wondering what the preferred running speed of a D3 should be. Lately we've been running the engine at around three thousand revs, but with the throttle pushed fully forward against the stop, it would give three and a half thousand. This is under load of course. I'm not in favour of running an engine flat out - and especially not doing so continuously.
It is generally reckoned with these motors to ease off ten per cent from 'flat out'. But is this for engines under load, or free running?
| jezbanks |
| (regular) |
| 16/05/2008 14:54 |
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Re: Volvo D3 running speeds.
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The D3 is rated to 4,000rpm - so if you are only getting 3,500rpm on the stops I would start to question your set up. Is the boat particularly fouled, or has a lot more (heavy) kit on than standard?
| D3B |
| (regular) |
| 16/05/2008 15:37 |
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Re: Volvo D3 running speeds.
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Jez
My D3-160's used to give 3800 max.
since i had the overheating problem ....now cured i can only get 3650.
clean bum, new A/F.
engines are due a major service so will see if it improves after that.
But i suspect VP have teaked them down a bit....
| jezbanks |
| (regular) |
| 16/05/2008 16:14 |
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Re: Volvo D3 running speeds.
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Fair do's. I have only been on one other d3 powered boat and that made close to the 4000rpm mark.
| Philip_Fry |
| (regular) |
| 16/05/2008 17:45 |
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Re: Volvo D3 running speeds.
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> The D3 is rated to 4,000rpm - so if you are only getting 3,500rpm on the stops I would start to question your set up <
Someone has suggested it - Nimbus 280 'Familia' - is over propped.
May be so, but think I'd prefer that than to have too small a propeller.
Be that as it may, but I don't fancy running the engine at a higher speed than designed.
| Lateboater |
| (regular) |
| 16/05/2008 20:12 |
Re: Volvo D3 running speeds.
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Phillip,
Whithout wishing to be rude where on earth are you coming from. Listen to Westline.
A diesel engine HAS to make rated rpm plus droop. On an electronic engine droop is only about 50 rpm. Therefore unless you get to rated rpm plus the droop you are overloading your engine.
Bear in mind this is by the exponent of the rpm. Therefore running at WOT and only reaching say 200 rpm less than rated speed can result in an overload of as much as 100%.
Any diesel engine will not be damaged by running on the governor.