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Old 30 December 2010, 17:19   #1
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Repower a Humber Destroyer

I have a humber destroyer 5.8 with an old 150 mariner 2 stroke that's EOL - a friend of mine has a honda 90 4 stroke and thinking of trying it.

I know, I cannot expect the same power, but should a 90 4 stroke be enough to play around?

What about fuel consumption comparing HP to weight?
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Old 30 December 2010, 17:28   #2
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Imagine taking the engine out of an aging Lamborghini and replacing it with one from a Toyota Yaris. It'll move.
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Old 30 December 2010, 17:39   #3
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Dave Mallet aka wavlength has a 6m Destroyer with a 90hp four stroke, goes very well considering hp / kg , I would expect about 35 knots.

90hp four stroke will use about 1litre per nm

Jono
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Old 30 December 2010, 17:50   #4
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Curent destroyer (2009 model) with a 90 opti makes 38kts and averages about 0.8l/nm. Ok its a 2 stroke so id expect Jono's estimate to be pretty close to reality.
Hope it helps you.
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Old 31 December 2010, 03:11   #5
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Quote:
Originally Posted by Jono Garton View Post
Dave Mallet aka wavlength has a 6m Destroyer with a 90hp four stroke,
Funny that, 'coz Andy Scholes aka 'Sticky' has a 90 Honda on a 5.5 Gemini and that's as flat as a fart.

Describing 35knts tops for a 6m boat as 'goes very well', sounds like Jono is trying to flog it.
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Old 31 December 2010, 03:18   #6
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Quote:
Originally Posted by BarflyRIB View Post
I have a humber destroyer 5.8 with an old 150 mariner 2 stroke that's EOL - a friend of mine has a honda 90 4 stroke and thinking of trying it.

I know, I cannot expect the same power, but should a 90 4 stroke be enough to play around?

What about fuel consumption comparing HP to weight?
Wow thats quite a jump and will be equivalent to about half as much power on the rib.
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Old 31 December 2010, 03:53   #7
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Originally Posted by Chris View Post
Wow thats quite a jump and will be equivalent to about half as much power on the rib.
Half the fuel consumption as well though
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Old 31 December 2010, 04:06   #8
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Half the fuel consumption as well though
Probably not. The 90 would be getting it's @rse whipped all day to keep it near it's 35knts.

Imagine reselling it. Any prospective buyer is gonna think that the main engine has been pinched.
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Old 31 December 2010, 06:26   #9
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Quote:
Originally Posted by BarflyRIB View Post
I have a humber destroyer 5.8 with an old 150 mariner 2 stroke that's EOL - a friend of mine has a honda 90 4 stroke and thinking of trying it.

I know, I cannot expect the same power, but should a 90 4 stroke be enough to play around?

What about fuel consumption comparing HP to weight?
There's a Honda 135hp here, but it's an extra-long-shaft? Seems expensive for the hours on it. http://www.findafishingboat.com/hond...-shaft/DS29943
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Old 01 January 2011, 11:43   #10
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I have a suzi 90 on a 5.8m, admittedly its a bit lardy with a dual console, aux, twin batteries and about 100l of fuel but I can cruise 2 up at around 24 knots and get 30 flat out.
Even without all the extra stuff I don't think 38 knots is realistic with a 4 stroker
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