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Old 25 August 2013, 12:43   #1
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Country: France
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Fitting bigger outboard than Max recommended.

This question is more longer term but would be interested in people's views.

I have a Piranha 6.0m RIB with a 90hp ETEC. Both are just 1yr old. I am happy with both for the type of RIB cruising we do. However, we have been doing some wakeboarding, waterskiing and may progress to mono-skiing. This configuration is fine for wakeboarding and ok for twin ski water skiing but I think serious mono-skiing is too much for a 90 ETEC and the 115 ETEC would be much better in that one would not be pushing the engine so hard. Most likely the 115hp would be more economical.

Here is my dilemma: My Polish build Piranha 6.0m is rated to a maximum 90HP only; also this RIB requires an extra long shaft ie 25". I rang up Powertech the Evinrude dealer who supplied the engine to enquire about a trade-in to put a 115 ETEC on the RIB but he said he was not allowed to exceed the maximum quoted HP. My reasoning was that the 115HP ETEC is still lighter than other 90HP outboards and it should not be too much of an issue. I also spoke to Piranha and their response was as follows:

"All of our new models are now manufactured with long shafts (20") rather than extra long (25"). Your model is an 25" and yes this may loose a few knts in top speed because of the larger gear box.

We are not at a stage yet where we have CE approval for rigging the 6m with a larger engine and therefore we could certainly not endorse you rigging the 6m with a 115hp."

My question is: If I did decide to uprate the engine would another dealer do the upgrade or do I just bite the bullet and stay with what I have or eventually look at selling current set up and starting again? (I do like the design of the Piranha RIB and ours is in immaculate condition with 4 yrs of warranty left on both boat and RIB)

A final complication is that the boat/engine/trailer are all in France where it is kept and would mean bringing it all back to the UK for the Winter to do the necessary deals.
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Old 25 August 2013, 12:51   #2
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I would think that your remaining warranty won't be worth the paper it's written on should you decided to exceed the Max HP.
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Old 25 August 2013, 13:02   #3
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When a rib is made for resale then it goes through a process and is given a CE approval for a maximum HP.

If you exceed this approved hp rating then I cant see you being insured and you are also knowingly fitting a larger hp engine than is safely recommended for your craft.

Therefore, if something goes wrong and the worst happens you may well be in a whole world of trouble you could find yourself in prison and thats before you even start to think about the costs. This is why public liability insurance cover is so high.

If you have bought a 6m rib that is only rated for a 90hp then something is seriously wrong somewhere....
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Old 25 August 2013, 13:19   #4
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Thanks for all your replies. It is rated at 90hp max so will have to live with it.
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Old 25 August 2013, 13:24   #5
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Unfortunately yes, or until the manufacturer is willing to change the CE plate on your rib if they gain a higher max hp rating for that craft and I would also get this in writing with your serial number documented
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Old 25 August 2013, 13:28   #6
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Yep yep yep! Unusual for a 6 mtr only to take a 90. Most uk built ribs can go to 150 hp . Its rated for a reason. Could be the transom is not man enough for the extra beans Mr Taggart!
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Old 25 August 2013, 13:47   #7
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Quote:
Originally Posted by nigel52 View Post
My reasoning was that the 115HP ETEC is still lighter than other 90HP outboards and it should not be too much of an issue.
Its not just the weight but the additional force that the engine will push with. If it didn't have any additional force you wouldn't be bothering...
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Old 25 August 2013, 13:50   #8
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Yep yep yep! Unusual for a 6 mtr only to take a 90. Most uk built ribs can go to 150 hp . Its rated for a reason. Could be the transom is not man enough for the extra beans Mr Taggart!
Yep, it will be down to the design of the rib, I've never seen one but looking at this video the hull looks quite small for a 6m?

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Old 25 August 2013, 14:25   #9
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I have a similar question really, and I supposed the answer will probably be the same!

My transom is rated for 200 HP, and 220Kgs, but what if I wanted to put on a 200HP etec, HO DHX, which is 228Kgs, I guess my insurance will probably say no? Are they that tight about 8Kgs? or put another way a measly 3.6%
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Old 26 August 2013, 05:04   #10
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Originally Posted by tonto View Post
I have a similar question really, and I supposed the answer will probably be the same!

My transom is rated for 200 HP, and 220Kgs, but what if I wanted to put on a 200HP etec, HO DHX, which is 228Kgs, I guess my insurance will probably say no? Are they that tight about 8Kgs? or put another way a measly 3.6%
There's probably a law against it, if not we could always start a campaign to get one introduced:P
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