I’m considering a Yanmar 3YM30 or alternatively a Beta Marine 25 or 29.

What 3 cylinder engines and propellors(!) are currently in use for Parker 325/335,

I have a 15” VariProfile propellor which I hope can be used.

Both good engines I believe. The Beta also has a good reputation in the UK and Beta Marine are said to be good people to deal with.

Parkers fitted quite a lot of KiwiProps, We have had two on different boats, they seem to work well and last.

Martin

335/50

I replaced Blue Moon's original and underpowered engine with a 3YM20 and it think it is plenty powerful enough - 6.5 knots in flat water, nice and smooth, not too noisy. It has the same footprint as the original Yanmar (a 2GM something) so dropped onto the existing mountings. The propeller is a 3-blade Featherstream which I love - and was glad not to have to pay for!

Peter

But it would be interesting to hear from those who have the 30hp Yanmar. And I do hear good things about the Beta, but if you already have a Yanmar upgrade to the 20.

Best Wishes,

John Clack

ANNE AND DENNIS KELL

I have the old Yanmar 3GM30. You have to cut a corner off the engine mounts to fit it. This doesn't seem to cause any problems but then I have an aquadrive which absorbs some of the engine vibrations.

As Peter Dan has been round Britain with his new engine he is well placed to comment. My engine does not produce more speed than Peter's in flat water. But then it is 22 years old. I don't know if a new engine would be any better.

If I replaced my engine I would probably choose the same as before as I understand I would have to recalibrate the feathering propellor if using a different horsepower engine.

You can have higher output alternators as an option so that is worth investigating. If they will fit.

Mike

I've attached the fuel combustion curves for the YM20 and 30 which make interesting reading. I was looking at these when I was deciding between the 20 and the 30.

When we were on the French Canals - flat water, 5~6kn limit - I was getting better that less than a litre per hour, although that was the 2YM16 ... A tribute to the Parker's sleek hull.

See attached curves and enter your cruising revs.

Regards,

John

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That is interesting. I generally cruise at 2200 revs as it is quieter and produces 5 knots in flat water. According to your chart that is 2.2 litres an hour which coincidentally I have always worked on as someone told me that ages ago.

When I go flat out against the tide it manages a sustained 2700 revs, but not much more as it is an old engine. This is 4 litres an hour which I did not know. I had no idea it used so much. If that is true, it might make more sense to have the 20 horsepower engine. It would be interesting to know how many revs it produces flat out. Over to you Peter!

Mike

Mike