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Old 12 January 2013, 17:27   #1
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Back up engine help please.

Not a Rib or a Sib i know but you gents have be so hopeful in the past i thought i would give it a try.
SO i sold the Sib and now have a Bayliner Capri,Its 19.5 ft long weighs around 1200Kgs and im looking at a back up engine.Ideally i would like a long shaft 2 stroke with built in fuel tank so i could keep it up front in the cuddy and pull it out should the worst happen.Been offered a 3.5hp Mariner but can anyone tell me if this would push my boat along.
Thanks
Pete
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Old 12 January 2013, 17:36   #2
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Originally Posted by secondopsman View Post
3.5hp Mariner can anyone tell me if this would push my boat along.
Thanks
Pete
No. That's a heavy lump to push. I'd start at 6hp, maybe even a 9.8hp Tohatsu 2 stroke if you like huntng hen's teeth.
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Old 12 January 2013, 17:47   #3
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go away with your binliner! only joking, id def go for a 2 stroke 9.9 or 15. get a small external tank. an internal one is likely to leak in your cuddy.
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Old 13 January 2013, 01:54   #4
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I'm with NOS4R2 6-9.9. I think 8 would be perfect.
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Old 13 January 2013, 03:53   #5
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This brings in the big question again i.e. how you want to use it and where you are. If you just want to get to safty and only go out in goodish weather with no or small currents then the 3.5 would be ok. If you want walking pace or fast walking pace then I would go for a 5-10hp. Above that I would suggest you

a: think again
b: get a twin set up
c: go to the gym a lot and aerobics classes as lifting a 15hp 2 stroke on a rolling boat will be hard work.

oh and as stated the tohatsu engine is like hens teeth and so is the yamaha equivalent as everyone has the same problem.

safe boating

Dave
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Old 13 January 2013, 04:07   #6
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Thanks for the replies so far.
Useage wise we go out to sea but not far as the wife moansand only in calm weather and also on Windermere but again only in nice weather,
Its only to get us back in the event of an inboard engine failure.
Reason i was looking smallish was the lifting it on / off.
Pete
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Old 13 January 2013, 04:20   #7
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well I would go with 5-6hp and if you can lift around 28kg I would even go 4 stroke and the best that you can afford as it is there to save your life and keep the wife happy. oh and they also hold their value very well. Tohatsu are the same as mercury / mariner (all made by Nissan) and would be perfect. Honda or Yamaha if you are rich.

oh and please remember to start it up before you go out!

Dave
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Old 13 January 2013, 04:46   #8
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To give you an idea,

I have a Northcraft rig that weighs about the same.

My backup which I have used on several occasions is a Susi 8hp 2 stroke. It has a built in iil tank and I have plumbed into the main tank but also have an external.

Pushed the boat at 5knotts very max is 6. After engine failure used to get back to port this year but opposing tide flow meant I was making 2 knots. ... Long journey!

I think 8-10 would be sensible and I suggest you do what I do and test each outing.

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Old 13 January 2013, 05:50   #9
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Old 13 January 2013, 07:12   #10
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A few years ago I had a 26ft 2299kg Bayliner and I used a 5hp, 2 Stroke Mariner Long shaft as a backup.

Luckily I never needed to use it in anger, but when I tried it on a calm day with no tidal flow on the Broads I found it would only just move me at around 1-2kts.

Your Capri is lighter so I think 5hp would be fine on Windermere, but if you are going out to sea you are going to need a more grunt. Have a look around for a saildrive outboard, they have long or extra long shafts and a bigger, slower turning prop more suited to displacement boats.

If all I could buy/store was a 5hp I would get it, but for safety I would look for about an 8hp, anything more is overkill because you will be pushing displacement hull speed.
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