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Old 09 February 2004, 16:22   #1
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40hp or 50hp???

I have a 4.1m Southern Pacific "Cormorant" RIB. The recommended engine for this boat is 40hp. I was wondering whether I might be able to out a 50hp on it without something terrible happening. The transform is pretty beefy - similar to those on RIBs capable of taking much bigger engines. The next model up, the 4.8m can take a 50hp. I was thinking that the transform on that is probably the same construction as on mine.
Anyone got any thoughts on this?
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Old 09 February 2004, 16:26   #2
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What you really want to be looking for is the maximum weight it can take, You could put a 40hp four stroke on it and it might knacker your transom. So the first thing to do is look at the weight before you look at how big an engine it can have.
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Old 09 February 2004, 16:28   #3
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Concure with Diesel, engine weight is more importantnt than BHP. Although engine power also has some relevance to transom strength.
Best check with manufacturer.
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Old 09 February 2004, 16:29   #4
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How does one find this out?
Since funds are slim, what ever I get will be a 2-stroke. How much lighter are they?
Surely the manufactures allows quite a bit of leeway for safety when it comes to these matters?
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Old 09 February 2004, 18:27   #5
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is there a manufacturers plate on the transom indicating max. weight and other details?
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Old 09 February 2004, 18:36   #6
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Comparative weights

Quote:
Originally posted by timofengland
what ever I get will be a 2-stroke. How much lighter are they?
Call me an anorak if you wish (and Ian and MeMe probably will) but here are some comparative weights of the latest 2-stroke/4-stroke offerings from the major manufacturers. With the modern engines weight differentials between 4 and 2 stroke are significantly less of an issue than they were some years ago. For example the Honda 50 4-stroke weighs 10kgs less than a Yammie 50 2-stroke!:

Mariner 40hp 2cylinder 2-stroke - 75kgs
" 40 and 50hp 3 cyl. 2-stroke - 93kgs
Mariner 40hp 4-stroke 3-cyl. - 93kgs
" 40hp EFI 4-stroke - 98kgs
" 50hp EFI 4-stroke - 112kgs

Suzuki 40/50hp EFI 4-stroke - 110kgs

Honda 40/50hp 4-stroke - 92kgs

Evinrude E-Tec 40/50/60hp direct injection 2-stroke - 107kgs

Yamaha 40hp 2-stroke - 88kgs
" 50hp 2-stroke - 102kgs
" 40hp 3 cyl. 4-stroke - 90kgs
" 40/50hp 4 cyl. 4-stroke - 108kgs

Above weights relate to long shaft engines with power trim/tilt where applicable.
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Old 09 February 2004, 18:38   #7
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Re: Comparative weights

Quote:
Originally posted by Phil Davies
Call me an anorak if you wish (and Ian and MeMe probably will
PD, I would never say anything of the sort.
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Old 09 February 2004, 18:41   #8
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Predictably predictable
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Old 09 February 2004, 18:43   #9
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There is a chap who has a 4.5 Cormorant and has a 60hp Big Foot 2 stroke on the back (110kg). He has not been out in it yet (I don't think) but might have a view. Come in 'xr770a' where are you?

He bought it here:
www.devamarine.co.uk/southern_pacific.htm
You could give them a ring.
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Old 10 February 2004, 04:06   #10
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If the makers plate says max 40hp, and you stick a 50hp on, you might find insurance a bit more difficult to source. 'Course if you aint bothered about insurance, then you can put whatever you like on the back. Your call........
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