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Repower Petrol to Diesel feasability

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Repower Petrol to Diesel feasability

Old 06-22-2019, 05:15 PM
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Default Repower Petrol to Diesel feasability

Hi
Just thinking of potential options - have a boat currently equipped with two old Volvo Penta AQ110 petrol engines and drive legs.
Wondering what sort of diesel sterndrive engines (keeping weight / size much in line with existing VP engines) would likely be suitable?

I know the fuel system and some electrical's would need changing - thinking of the engines & drives at present.
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Old 06-22-2019, 05:46 PM
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Probably the Yanmar 4JH 110 would be closest with HP, size and weight. Not going to be cheap to switch out....Fuel tank can be an issue, you have to have a diesel return line. The tanks will have to be cleaned--and maybe the best path is to replace tanks when replacing engines.
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Old 06-22-2019, 05:49 PM
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Originally Posted by paul j 2006 View Post
Hi
Just thinking of potential options - have a boat currently equipped with two old Volvo Penta AQ110 petrol engines and drive legs.
Wondering what sort of diesel sterndrive engines (keeping weight / size much in line with existing VP engines) would likely be suitable?

I know the fuel system and some electrical's would need changing - thinking of the engines & drives at present.
You'll need to provide more information about your boat to get the best responses and advice. It seems like you want to replace the old 4 cylinder engines with modern 4 cylinder diesel engines. Your best bet might be to talk to a volvo penta dealer first. Get quotes to replace both the engine and outdrive.
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Old 06-23-2019, 02:33 AM
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Don't go there. I have, it does not end well.
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Old 06-23-2019, 03:20 AM
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I’d find a new boat first
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Old 06-23-2019, 04:25 AM
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Cost advantage of diesels is usually realized in typically larger (35’) and heavier hulled boats. What size boat do you have ? As stated prior, required mods, let alone cost of even used diesels will often be cost prohibitive. Then finding the right person w/ diesel and boat construction experience to oversee the entire project would be key. Then there is taking into account how the ride characteristics will change requiring more work to prop and possibly add ballast, all which will effect ride.

I would strongly consider the previously provided advice, buy a boat w/ diesels.
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Old 06-23-2019, 04:38 AM
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Volvo sells some car based diesel engines in the 2 to 3liter range, with all the marine coolers attached. Might be able to fit up with existing legs. These are not common here in the States so not much experience with them. In the states diesels are not common until you get around 200hp upwards.

Agree with others above. This would be a very expensive conversion. The fuel savings would only pay off if you run this thing for hundreds of hours per year, if it pays off at all.
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Old 06-23-2019, 01:32 PM
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Unless you’re ready to dump much more cash into this vessel than you will ever be able to recoup, Repair or replace the gassers and go fishing!
If you’re in love with diesel and just have to have it, shop for a rig that’s already set up.
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Old 06-23-2019, 03:24 PM
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It wouldn't be cost effective.
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Old 06-23-2019, 04:18 PM
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Originally Posted by Gullpt View Post
I’d find a new boat first

Might be your best option.... Not only are you looking at replacing tanks, but you will be dealing with higher torque numbers although the HP may be similar. You may need to upsize all your running gear; shafts, stuffing boxes, struts, props, etc.

But if you are in love with the hull......
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Old 06-23-2019, 04:22 PM
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Originally Posted by Gullpt View Post
I’d find a new boat first
Or consider conversion to a single outboard. Like maybe a Suzuki 300/350.
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