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Old 16 February 2019, 10:03   #11
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Country: UK - England
Town: Waterlooville
Boat name: Tickler
Make: Halmatic P22
Length: 6m +
Engine: Inboard Diesel 140HP
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50 knots - that's faster than my 1HD engined Land Cruiser. I do get 5 miles to the litre though.
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Old 16 February 2019, 10:20   #12
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Country: UK - England
Town: blackpool
Boat name: Fast Forward
Make: Scorpion
Length: 8m +
Engine: 315 Yanmar
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Originally Posted by Bushrider View Post
Mike- no need to tweak - it's already faster
50kn to beat
Just wait till we hoist the spinnaker
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It looks massive on the trailer,but tiny in a big sea!
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Old 16 February 2019, 10:22   #13
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Country: Germany
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Boat name: Ocean Devil
Make: Scorpion 8.6m
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Engine: Yanmar 315hp
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Just wait till we hoist the spinnaker
Hmm .. - that's not fair
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6 cylinder diesel power
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Old 19 February 2019, 04:57   #14
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Country: UK - England
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Boat name: TOP CAT 2
Make: Scorpion 8.1
Length: 8m +
Engine: 250hp HO
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Yamaha 420 is the toyota 1hd with the 12 valve head (a few yamnars used the 12v head too but not many) different marinising equipment used obviously. One key diferance is yamaha used their own piston rings instead of the toyota ones which makes building a 420sti way more expensive than a 6lp
Is there any performance gains to be had out the 12v Yamaha. Iím interested in a boat with one but it only does 30mph
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Old 19 February 2019, 05:29   #15
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Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
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Posts: 2,100
I think the 240hp is getting close to the max, the 12v 1hd was 150 or 170hp in the landcruiser so its already up from stock. Iirc there was a HO version of the 422 at 275hp which had a larger intercooler and a few other mods but I'd imagine any gains would be quite costly to achieve.
Must be quite a heavy boat to only do 30mph? my 7.4m delta does 40kts with the same engine
does it have a problem or is it just underpowered?
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Old 19 February 2019, 10:49   #16
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It’s a windy 8800. Weight values are anywhere from 2.5t to 5t. They typically have twin ac211 v8 Pentas so underpowered. Lovely boat otherwise
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Old 19 February 2019, 13:32   #17
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Posts: 2,100
I'd guess the 2.5t is single petrol light boat & 5t is twin diesel fully loaded? so at a guess the diesel with a medium fuel load etc should be a touch under 3t? it still seems very slow.
I owned a crownline 242 which tipped the scales at 3t empty of fuel etc and loaded for a 2 week holiday for 4 it still did 36kts with a 250hp mercruiser diesel which i doubt is much if any more powerfull than the yam. Unless the windy hull is very deep vee making it power hungry I'd be looking for a problem causing a power loss.
If the 30mph comes from manufacturers figures then ok thats what it is but if its from a test run then id suspect a running issue.
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