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Old 19-01-2007, 04:42   #1
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Two Engines

Hi all.
Know there's been lots of talk about re-engine changing on our cats.

But just wondered. I presently have a single 9.9 outboard and most people asume I would change to two 9.9 inboards. Why ? that would double my engine power .

I would of thought two 6's or 8's would be more than enough and still more than my present.

???

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Old 19-01-2007, 05:29   #2
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If you currently have Yamie 9.9 it is a high thrust o/b and the 6 & 8 are not.

The Yamie will stop you on your length, almost , and the others will do nothing.

Dave
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Old 19-01-2007, 09:37   #3
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how much does your boat weigh? Two 6's should be fine if the 9.9 works.
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Old 23-01-2007, 11:54   #4
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Tks for responding.
PM is about 3 - 3.5 tones. I just wondered why when replacing one engine (outboard) with two inboards every one seems to double up. using 6's ot 8's reduces the size quite a bit.
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Old 28-01-2007, 09:28   #5
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Im not sure but it would be much heavier to add two 9 horse inboards. Go with the small ones. Outboards are much cheaper but diesel is a nice feature. I have a 30 hp outboard on my cat. I wouldn't put inboards in the boat as I feel it is too small. I would go with two 15's if I had to change. Perhaps someone on the board knows of some very compact inboards that would suit your needs.
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Old 28-01-2007, 14:21   #6
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Lombardini do a light diesel, not sure how small, Yanmar do a 9 hp

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Old 28-01-2007, 14:34   #7
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if it were me id be thinkin, if one quit could i fight a strong current ,winds,or a rip....jt
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Old 31-01-2007, 05:39   #8
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Update
Just found a new site. Search Torqeedo.
Looks good
Maybe the answer need input. I have mailed them to ask there views and cost for a twin instalation. Quite a good site.
Captjohn. I would do the same as I would if I lost my single 9.9.
Sail.
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Old 31-01-2007, 09:26   #9
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They look cool. Check out the battery situation. You may need more range. Perhaps lots of solar power would help.
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