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Old 13 October 2005, 08:11   #1
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Country: UK - England
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Make: Humber 8.5 Offshore
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Opti owners

I have noticed that when trimming up or down at low revs I get a slight dip in revs when the trim motor is running , I assume this is due to power being drawn away from the injectors to the trim motor . Am I alone or do all Optimax engines do this or am I about to suffer some ghastly failure ?
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Old 13 October 2005, 08:54   #2
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Quote:
Originally Posted by LURCHER
I have noticed that when trimming up or down at low revs I get a slight dip in revs when the trim motor is running , I assume this is due to power being drawn away from the injectors to the trim motor . Am I alone or do all Optimax engines do this or am I about to suffer some ghastly failure ?
150 Optimax
It's no different than whacking the car headlights on main beam on tick over. The alternator is loaded and the revs dip.
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Old 13 October 2005, 15:22   #3
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I would not think that it's anything to worry about. Just make sure the main 12v connections at both the battery and the engine are good, clean and well greased.
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Old 13 October 2005, 17:24   #4
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I have had same when trimming out enging - makes sense that it is a dip in power. But just think of the extra forward thrust the hydraulics are giving while operating
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Old 13 October 2005, 18:08   #5
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Country: UK - England
Town: Tisted Hampshire
Boat name: SKYEHOUND
Make: Humber 8.5 Offshore
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Engine: KAD44 EDC
MMSI: 235050357
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Opti

Thanks I can relax now 'till I hear the next odd noise !
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Old 13 October 2005, 18:57   #6
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Country: UK - Wales
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oh yes got that one too ,no problem, its just due to the low revs and low power output, as they said head lights on the car,find something else to worry about!
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Old 13 October 2005, 19:10   #7
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Quote:
Originally Posted by LURCHER
I have noticed that when trimming up or down at low revs I get a slight dip in revs when the trim motor is running , I assume this is due to power being drawn away from the injectors to the trim motor . Am I alone or do all Optimax engines do this or am I about to suffer some ghastly failure ?
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Hmmm, can't say I've noticed that, although I also can't say I trim it at low revs! Got a charter tomorrow, so I'll give it a go.
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Old 14 October 2005, 07:32   #8
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Mine does it (ever so slightly) at mid range revs - no more than a very slight change in tone
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