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Old 25 October 2004, 10:55   #1
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back-up engine

Well its finally happened after lots of searching and lots of helpful tips from this forum. I am now the proud owner of a 7.5 Scorpion rib.

Actually to anybody looking for a rib this is a good time, many people think about selling, many becuase they did not use it much and considered it alot of money just sitting there.

Anyway, my question, i am going to get a back-up engine, i was thinking 5-6 hp just to get me home, the reason i say this hp is because MBM did a section on this quite recently
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Old 25 October 2004, 11:06   #2
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Congratulations! An excellent buy if I do say so myself. What year & engine?

5-6hp will be fine as an aux. I had a 6hp Tohatsu & I think Richard B now has a 5hp on the same boat. You wont go anywhere fast or neccessarily against the tide but it will move you along. For max endurance and min hassle go for a 4 stroke and get it plumbed into the main tank. (assuming you have an oil injected or 4 stroke main engine).

HTH,
Alan
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Old 25 October 2004, 12:57   #3
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Quote:
Originally Posted by Alan
Congratulations! An excellent buy if I do say so myself. What year & engine?

5-6hp will be fine as an aux. I had a 6hp Tohatsu & I think Richard B now has a 5hp on the same boat. You wont go anywhere fast or neccessarily against the tide but it will move you along. For max endurance and min hassle go for a 4 stroke and get it plumbed into the main tank. (assuming you have an oil injected or 4 stroke main engine).

HTH,
Alan
I was told NOT to use the main tank as if it is fuel probs that have caused your main engine to stop it will do the same to the aux.
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Old 25 October 2004, 13:07   #4
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Originally Posted by codprawn
I was told NOT to use the main tank as if it is fuel probs that have caused your main engine to stop it will do the same to the aux.
Whole heartedly agree, been there done that and we suffered. Our dive club boat had a common fuel tank, fuel contaminated bingo no engines main or Aux Doh!!

Brian.
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Old 25 October 2004, 13:27   #5
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mmm.. yup, if it's a fuel problem that stops your main. What if it's something else and your miles from base? If you have the OPTION of using either a separate tank or plumbing into the main, is that not better. Wouldn't you feel a chump running the aux dry, 10 miles from home whilst sat on 100 litres of unreachable fuel...
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Old 25 October 2004, 13:31   #6
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Jono, whilst I agree I think you miss the point, you don't hed for home but to a safe haven to sort the prob. Sitting on 100 liters of contaminated fuel and 2 engines 10 miles from home is equally foolish. All IMHO of course.

Brian
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Old 25 October 2004, 14:20   #7
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Quote:
Originally Posted by Alan
For max endurance and min hassle go for a 4 stroke and get it plumbed into the main tank. (assuming you have an oil injected or 4 stroke main engine)
... and what happens next if it happens that the main engine seases due to water (say hypothetically) in the main tank. Your aux engine goes in the bin too and start using the flippers or get down and push the boat?

For the Scorpion I think a Tohatsu 5bhp 2stroke (I am not into the 4 strokes yet) with its own little tank on it will be OK...ish. I do do not know if the bigger Tohatsus have own tank but the bigger aux engine you get the better for a boat of that size and weight will be.

Nice choice of a good seaworthy hull and hope that you enjoy her.
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Old 25 October 2004, 14:52   #8
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Didn't some fellow in a yellow RIB do quite a lot of miles on an auxiliary diesel from time to time a couple of years ago? I wonder whether he used a little portable tank or tapped off a main tank...
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Old 25 October 2004, 15:10   #9
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Didn't some fellow in a yellow RIB do quite a lot of miles on an auxiliary diesel from time to time a couple of years ago? I wonder whether he used a little portable tank or tapped off a main tank...
Nah he carried a collection of jerry cans or aux fuel tanks which is of course what you have to do to be absolutely postively sure that your aux will work. Along with running it everytime you go out rather than leaving it bolted to the transom unloved and wondering why it wont start when you need it

I hear the arguments about not running from the main tank but personally if I have an aux I want to be able to run it for as long as I can.
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Old 25 October 2004, 15:14   #10
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...keep every option open...
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