Originally Posted by Iron Dials
So, to ask a "how long is a piece of string" question of people's experience.....
Apart from the particular personalities of petrol v diesel I'm curious as to the general view on diesel inboards in ribs?
If a man was looking at buying a second hand daysil boat (eventually) that he might hope to travel a few hundred miles from home in a week diesel seems to be much more widely available if you aim for fishing harbours.
The three spots you can get petrol on E coast of Ireland are all within the Dublin bay area, so tankering petrol would be v necessary.
What's the max engine hours you'd accept? Are diesel engines assumed to have a finite service life? Assuming a reasonable level of service history.
Do rebuilt engines make you nervous or is that generally a good sign?
How do outdrives survive the non-judgemental love they get from weed and barnacles?
Are they noisy, smelly, slow, hateable beasts? Or smooth, economical, reliable and desirable?
Are they generally the preserve of commercial boats?
I was thinking something of at least 150 hp upwards in 6.5-7.5m.
And this is a longer term planning question rather than money burning a hole in my pocket tonight question.
I was looking for diesel 10 years ago at the last boat change. Great fuel consumption was the main draw. However, I was looking at 6.5m and back then diesel didn't really work. The engine choice for that size of boat was basically the 120hp mercruiser - which wasn't a great Engine and not really enough power for 6.5m. We tried a 6.5m Coastline with this engine and the hull was just getting into its stride as the engine ran out of puff at 30ish knots.
A Volvo Penta KAD32 in a 6.5m would have worked well.
Also the engine takes up a whole row of seats.
There are a couple of 7m coastlines in the dry stack near me with Volvo Penta D3 engines which seem to work quite well.
Volvo Penta KAD42/43/44/300 series engines I feel are ideally matched to a rib. Turbo to get the power allied with a supercharger for low speed torque to get you in the plane quickly. There were a couple of 7.4m Ribtecs built with these.
Drove a 7.4m ribtec with a Yamaha 4.4litre, 240hp. Ok once up and running but no go until the turbo spooled up.
I had some time driving Sunseeker superhawk 34s with both KAD300s and Yanmar 315s. Totally different beasts - Volvo boats felt as they should. Easy up on to the plane. The Yanmar boats were faster but the turbo lag was horrific. If you floored the throttles from a standing start it could be 20 seconds or more before they spooled up!
Depends what your budget is. The 370hp V8 twin turbo Yanmar should be a good rib engine.
Volvo Penta D6 with a supercharger as well as the turbo will also be good.
Each of these engine and drive packages will be at least £30k however, possibly more.
Hours - many thousands with good maintainance not a problem.
Rebuilt engine - OK as long as the person who rebuilt it knows what they were doing.
Stern drives. Horrible hateful things that just suck up money every year - but a necessary evil!