Repower a Humber Destroyer

[BarflyRIB]

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?

[Mollers]

Imagine taking the engine out of an aging Lamborghini and replacing it with one from a Toyota Yaris. It'll move.

[Jono Garton]

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

[Dave P]

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.

[Mollers]

Originally Posted by Jono Garton

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.

[Chris]

Originally Posted by BarflyRIB

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.

[BogMonster]

Originally Posted by Chris

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

[Mollers]

Originally Posted by BogMonster

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.

[spartacus]

Originally Posted by BarflyRIB

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

[BruceB]

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