Re-Engine a GRP Folkboat

[ecb]

Folks, want some advice prior to a survey/price negotiation.

Been given conflicting advice (as always!!) about re-engining a GRP folkboat. Currently has orginal 1978 Petter Mini 6 (?) which has not run for many years - not sure it would be worth spending money having it worked on.

I am told that the Yanmar 1GM10 is the best choice. Roughly how much new? Also very roughly, how much should someone charge for installing it? I think the current prop and shaft seem okay.



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[bob_tyler]

Have a look at the Beta 10/13.5. Runs like a sewing machine. Usually have good offers at the London Boat Show.

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[Evadne]

1) Depends on condition, a friend recently stripped down and rebuilt his Petter, after an accident with the oil and the bilges, and it now runs like clockwork. Saved a fortune. It is a simple beast, like the Yanmar. Like me, you'll have the prop in a notch in the rudder/deadwood? If so 10hp is probably as big as you'll manage to make use of.
2) Beta and Yanmar are the two names that come up the most. I have a Yanmar and it's pretty reliable, lots of advice if owt goes wrong and simple. Beta is similar, based on the Kubota tractor engine. I get the impression it is stronger and maybe more reliable, but may be physically bigger and/or heavier.
3) Another friend had to re-engine his centaur last year, cost about 4 grand all-in. Most of that will be labour, but he was fitting a Beta (next size up). I think a new Beta/Yanmar comes out at £1800 ish? Easiest way is to ring someone and ask, or visit Excel in January.
4) Check that the prop is correct for the increased HP, using a prop calculator or (better) dealer's advice. I expect you'll have to change it to get the best out of the new engine. If not, make sure that the two engines spin the prop in the same direction!

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[Gunfleet]

I think a new Yanmar 1GM10 will be more than that. .. more like £2.5K

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[Capt_Scarlet]

Peter at Marine Power at Bursledon may have some recon Yanmars for sale.

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[alahol2]

A new Beta 13.5 around £2800 diy.

<hr width=100% size=1><A target="_blank" HREF=http://www.troppo.co.uk> Follow the Tightwad Sailor</A>

 

[MarkJohnson]

Re-engined my Halcyon 27 in year 2000, Betamarine 13,5 hp cost about £2000, and yard costs were about £600.

Couple of years out of date I guess, but made the difference in sailing around the Welsh and Irish coast.

Well worth the money, what ever engine you choose.



<hr width=100% size=1>www.markjohnsonafloat.org.uk

 

[dodgie]

Re-engined my Folkboat with a Yanmar 1GM10. Bought it for next to nothing with a BMW diesel that was irrepairable, so went the new engine route. Apart from some initial problems with water in the fuel, its going fine. Fitted neatly into the previous inboard space.

Have to say though that its still tough going into a headwind and tide, which it always seems to be on the way back to the marina. Bit like roads always going uphill, and rarely down, I guess. Have wondered from time to time if the prop is correct - its the same one as with the BMW - but the shop says its fine.

Can't help with UK prices though - mine's in Orstrailya /forums/images/graemlins/blush.gif

 

[oldharry]

If the BMW was the about same HP as the new Yanmar, and the maximum shaft speed is the same, (and assuming the BMW prop was the right one anyway!), then the prop will be OK.

However, who is to say the BMW had the right prop on it? If the Yanmar pushes the boat along quite fast at low speed, but does not seem to go very much faster when the throttle is opened, and lacks power, or alternatively needs quite a lot of throttle to get it moving, revs hard, but still lacks power, then that would suggest the wrong size prop is fitted. Speak to Lancing Marine - they have a comprehensive coprogramme for prop calcs, and will tell you over the phone what sizes of prop are suitable: you will need to know the w/l length of your boat, its displacement, gear ratio of the engine, its max revs, and the largest size prop you can fit. They can then advise on the best sizes, and the speed you should expect from it. See: www.lancingmarine.com