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Old 19 November 2012, 16:21   #1
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Suz DT25/30 bits

1992 DT30 CDI / engine management box. I believe electrically compatible with subsequent years after a couple of connector changes (M/F kind of thing). Never tested but believed working. 40

Longshaft leg incl all the reverse lock gubbins & tilt toob. 1993 livery colour - Make me an offer to cover the postage. Depending on your location & lack of urgency, I may be able to drop it off.


Pic:
http://www.rib.net/forum/attachment....0&d=1303245807
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Old 19 November 2012, 20:08   #2
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Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Does anyone know how to bypass the rev-limiter on a DT25?
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Old 20 November 2012, 09:49   #3
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Country: UK - Scotland
Boat name: Wildheart
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Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Bent bit of metal on the end of the middle carb shaft + replace the plastic spring / cam assy.

No idea if it's "soft limited" in the CDi? - I never ran mine with a tacho - it just felt sprightlier after the mechanical mods!
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Old 20 November 2012, 13:00   #4
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Country: UK - Wales
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Yeah, there's an electronic gizmo that won't let it get past 6000ish rpm. I'd like to know if anyone knows of a way of bypassing the little menace.
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Old 20 November 2012, 16:55   #5
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
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Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
In all seriousness, how well do you know that engine?

I killed a clamshell by running it too fast with an advanced spark.....

...and how much do you reckon you can eek out of it?

I have a CDI if you want to use it for testing.
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Old 20 November 2012, 18:54   #6
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Quote:
Originally Posted by 9D280 View Post
In all seriousness, how well do you know that engine?
We've become good friends over the last few weeks, during which time, I've rescued it from Ingland, given it a nice clean garage to live in (temporarily), introduced it to its new partner (Avon R340 RIB), lavished it with some nice new components and given it a bit of a clean up. I even treated it to a couple of nights with Rowg Waiv, but that's another story.

Quote:
Originally Posted by 9D280 View Post
I killed a clamshell by running it too fast with an advanced spark.....
Serves you right for messing with Mercs.

Quote:
Originally Posted by 9D280 View Post
...and how much do you reckon you can eek out of it?
Don't know, to be honest, but twood be a nice little project to experiment with. I reckon I can get lots more midrange, but top end improvement is limited, unless I can get it to sing a bit. As It'll be pushing a small, light RIB, more top end revs would be desirable.

Quote:
Originally Posted by 9D280 View Post
I have a CDI if you want to use it for testing.
If I knew the first thing about what goes on inside those things, then I'd gladly take you up on your kind offer, but it's a different world in there! If I can fiind someone who knows how to work around the rev limiter, I'll let you know.
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Old 21 November 2012, 04:31   #7
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Quote:
Originally Posted by Downhilldai View Post
Serves you right for messing with Mercs.
It did sound reeeeeally good ....for about 5 seconds as it passed 35 knots :banana:.... before it stopped dead as the bits off the top of the piston shorted the plugs.....

There was a thread on the racing section a while back about using a solenoid to advance spark at low/ mid RPM. If it's midrange you're after have a read at that. I did toy with it for a while but reckoned one broken engine was enough!

Admin: is it worth moving this conversation to the "engines" section & leaving the "for sale" bit alone? - I;m hyjacking my own thread!
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