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Old 29 March 2016, 07:07   #41
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There aren't any Quicksilver engines. Perhaps Willk had in mind Mercury Diesel. These are the QSD 2.0 QSD, 2.8, QSD 4.2, TDI 3.0 and TDI 4.2 and there is nothing wrong with these engines
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Old 29 March 2016, 07:12   #42
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There aren't any Quicksilver engines. Perhaps Willk had in mind Mercury Diesel.
You're not wrong! Mercruiser was the word I was reaching for. There are a lot of them kicking around over here on older/smaller ribs - just waiting to trap the unwary so I thought I'd warn the OP. My bad.
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Old 29 March 2016, 07:46   #43
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You've been looking in the wrong engines

https://www.yanmar.com/media/global/...Zdatasheet.pdf
Could well be...
I'll cadge a go on yours in the Summer if our paths cross!
....Not tried a Big Goldfish either!
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Old 29 March 2016, 08:35   #44
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Wheezy 240hp old school Yanmar diesel on a 8m "sports" rib? Horribly underpowered - no wonder he was twiddling with the trim!

Try that same rib with a 370hp V8 twin turbo Yanmar 8LV
But then a little old 250 hp outboard on a 7.5 would be a lovely combination.................
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Old 29 March 2016, 09:35   #45
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But then a little old 250 hp outboard on a 7.5 would be a lovely combination.................
I'm not sure a 250hp outboard on a 8m Scorpion would be particularly scintillating either. IMO, your mate has a poor choice of engine if he plans to impress his buddies. Possibly suits him very well for offshore cruising though? Sounds like he'd forgotten to trim his leg down - there's no way that boat was going to get out of the hole trimmed up. I've tried that in an 8.5m with a Yanmar 315hp (4 up) and it was spectacularly unsuccessful. The combination of turbo lag and a 1/2 ton of iron in the stern made sure of that! Effectively the power comes at a rev you won't easily achieve off the plane - so you have to use the noggin - trim down, power on. So a lardy old diesel wouldn't be my choice over a petrol o/b, no.

To return to your mate's problem again - maybe a 260hp, maybe a 7.5 or 8m, history does not relate - but he was in bother not because he had a diesel engine, but because he had one with piss poor low rev performance.

My 370 lifts a 2.5 ton RIB out of the hole in short order, with the leg trimmed waaay out, with six people on board. I know this because I did it by accident last season!
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Old 29 March 2016, 10:16   #46
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I'm not sure a 250hp outboard on a 8m Scorpion would be particularly scintillating either. IMO, your mate has a poor choice of engine if he plans to impress his buddies. Possibly suits him very well for offshore cruising though? Sounds like he'd forgotten to trim his leg down - there's no way that boat was going to get out of the hole trimmed up. I've tried that in an 8.5m with a Yanmar 315hp (4 up) and it was spectacularly unsuccessful. The combination of turbo lag and a 1/2 ton of iron in the stern made sure of that! Effectively the power comes at a rev you won't easily achieve off the plane - so you have to use the noggin - trim down, power on. So a lardy old diesel wouldn't be my choice over a petrol o/b, no.

To return to your mate's problem again - maybe a 260hp, maybe a 7.5 or 8m, history does not relate - but he was in bother not because he had a diesel engine, but because he had one with piss poor low rev performance.

My 370 lifts a 2.5 ton RIB out of the hole in short order, with the leg trimmed waaay out, with six people on board. I know this because I did it by accident last season!
He'd not forgotten, if you check my earlier post you'd see he was working the trim to achieved the best acceleration ( I use the term 'acceleration' loosely ) and he said if he didn't keep on top of the trim the boat was even slower out of the hole.
Surprised you don't rate a 250 outboard on a 7-8m, you see loads around the Solent every weekend and, you might not believe this but some even on the plane Oh well, back to my buoyant explosive device
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Old 29 March 2016, 10:58   #47
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My 370 lifts a 2.5 ton RIB out of the hole in short order, with the leg trimmed waaay out, with six people on board. I know this because I did it by accident last season!
Bet it looked dead pro outside of a busy waterside boozer on a nice summer's eve?

You fixing the embarrassed grin whilst turning the place white.
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Old 29 March 2016, 11:07   #48
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Surprised you don't rate a 250 outboard on a 7-8m, you see loads around the Solent every weekend....
You're no more surprised than me because I didn't say it! I specifically said 250hp/8 meters. There's a world of difference between 7 and 8m!

It might help if you could remember what size of Scorpion it was that you were on!

Try not to explode
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Old 29 March 2016, 12:58   #49
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Old 29 March 2016, 13:07   #50
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The thing is you can't compare a petrol outboard with a diesel inboard as there so different it's like comparing a hot hatch with a landcruiser
Totally different horses for different courses
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