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Old 11 February 2013, 10:11   #1
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Diesel Inboards and Sterndrives.

Hi all.

Just a though Iím pondering at the moment, spured on by chatting to Biff on Friday, and probably wonít happen for a couple of years, if at all, but Iím considering the possibilities and feasibility of taking the Suzuki DT200EFI off the back of my Ocean 6.5 and dropping in a diesel and leg.

The reason for the change is that the cost of fuel means we just donít use it much anymore, so I will obviously also be looking at the numbers surrounding a swap to a newer outboard.

The 6.5 is a great boat, and Iíve done so much to it to get it how I want it, and of course I know it would be easier to sell it and buy a ready-made inboard RIB, but Iím convinced it will be cheaper, and a fantastic opportunity for a project, to convert my current RIB.

Iím happy that I can do the work myself, converting the hull, installation etc, but I just donít know anything about what engines and legs are available.

Obviously Iím aware that they are expensive, and that the more I pay for a used unit the newer, lighter, more reliable engine Iíll get.

Ideally Iíd be looking at @180HP, and 4 cylinder to keep the weight down.

So who knows what?
Has any schematics of sizes?
Or can offer general advise?

Yes Iím aware most of you will think Iím mad, but humour me please with some info.

Thanks

Nasher.
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Old 11 February 2013, 11:18   #2
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My earlier demo model the Parker 650 known as Black Magic now enjoying life with Greenpeace had the Cummins 2.0 (170HP) with the Bravo 1 leg. This engine is now the Mercury Diesel 2.0
You can also have the 150HP version with Alpha 1 with or without DTS controls and Smarcraft Vessel viewer. all depends on your budget.

it is a very good engine for a 650 rib
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Old 11 February 2013, 11:29   #3
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Thanks Andre

I remember Black Magic being a nice compact installation, so certainly one for the list.

Going to gather as much information as possible so I can make a decision.

Nasher.
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Old 11 February 2013, 12:01   #4
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I know you like an engineering challange but surely, for the cost of the install you could replace the 2 stroke suzuki for a more modern and efficient engine and spend the rest on fuel for the next few years at least!

Having had both inboard diesel and outboard ribs, our next boat will be outboard powered. The diesel was more fuel efficient but also noiser, heavier, took up a huge amount of space in the boat and the outdrive was a pain in the backside for us as the boat was left in the water.

Dont forget you will be paying full duty rate on fuel unless you can convince them you have some sort of heating on the boat, so cost per L is going to be similar to petrol.
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Old 11 February 2013, 12:57   #5
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Two or three thoughts for the mix:

1) The transom thickness and (to a lesser extent) angle are critical for a sterndrive, so check those to make sure its a possiability

2) 2nd hand diesel / stern drives are worth a fortune as everyone with a mercruiser petrol wishes they had a diesel... then they realise they need a new drive too and hence prices pushed up

If its feasable you will have a great boat. The fuel consumption quoted from the mercury 2.0 is fantastic and i've often fancied one (or two ) of those in a rib. Andre is best placed to advise I think... PS: Hi Andre

Im sure its long gone, but 10 years ago Stu Hopkins bought the 165 yamaha and drive that Mike removed from magellan. I dont recall what he did with it, and hes just the kind of guy to have it in his shed still....
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Old 11 February 2013, 13:01   #6
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I really can't see the point, as a proper job must be north of £20k, including supply of package, re structuring boat, re building transom, engine hatch, etc etc. Unless it's a love job for someone

Here's some tech on Mercruisers, but to be honest they're a dog of a motor. For Diesel it would have to be Yanmar, or even Volvo or Volkswagen, but never Merc, they can't even give them away!

http://download.brunswick-marine.com/download/dosearch/@isnew/desc?mod=7&lang=EN&categories=MERCRUISER$2012$Dies el$CMD%202.0L$
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Old 11 February 2013, 13:02   #7
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Quote:
Originally Posted by Daniel View Post
Im sure its long gone, but 10 years ago Stu Hopkins bought the 165 yamaha and drive that Mike removed from magellan. I dont recall what he did with it, and hes just the kind of guy to have it in his shed still....
I bought it, and fitted it in a sportscruiser, was a sweet little engine!
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Old 11 February 2013, 13:04   #8
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small world innit!!

Like the man says, 8-10k for a used engine and drive, 15-20k for a new one plus all the work and materials for an engine box...

Brand new bolt on 150 opti must be about £10k now days??
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Old 11 February 2013, 13:10   #9
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Originally Posted by Daniel View Post
Two or three thoughts for the mix:

1) The transom thickness and (to a lesser extent) angle are critical for a sterndrive, so check those to make sure its a possiability

2) 2nd hand diesel / stern drives are worth a fortune as everyone with a mercruiser petrol wishes they had a diesel... then they realise they need a new drive too and hence prices pushed up

.
Transom thickness is easily solved, 2" give or take a 16th", nothing that either a router or a sheet of ply wont solve. Angle is critical, ideally needs to be 13 degrees, but anywhere between 11 and 15 is ok. A drive is a drive. Small petrols and diesels use an Alpha1, big diesels and petrols use a Bravo. Only difference would be the ratio, but a prop swap usually takes care of that, if not, a gear swap is only a couple of hundred.

As for every one with a petrol wishes they had a diesel, in your dreams!!! Dirty noisy smelly, and ever so slow when you compare each option by pricing. You can have a pair of 300hp Smallblock packages for the price of one 300hp diesel.
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Old 11 February 2013, 13:18   #10
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If i had a 4.0 petrol inboard, i'd wish i had a diesel. Fair enough perhaps not everyone agrees with me. i didnt realise you could put a diesel on an alpha drive though, surely that makes the project more affordable as there's a fair few of those aboout 2nd hand???
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