Outboard weights

JohnW · 17 June 2019, 09:38

Looking for a bit of advice. We are looking to replace our current mercury 90hp due to it being beyond economical repair. I’ve asked Tornado for the max HP our rib can use and have been advised 150hp with max weight of 130kg.
We don’t want 150hp, something around 100 or 110 would be more suitable, but our current 90 weighs 139kg as it is. Does anyone know of a 110hp outboard that weighs 130kg or less?
Thanks

69cmw · 17 June 2019, 10:21

I would say no. But others may know better.
A Yamaha 2 stroke 90hp weighs 125kg, don’t think you will get anything lighter.

beamishken · 17 June 2019, 10:55

Are you 100% sure those figures are correct? If they are it would appear that tornado speced their transom for an engine that doesnt exist
Perhaps they anticipated engines getting lighter but I suspect the figures are wrong

Phil M · 17 June 2019, 11:23

My data is a few years old now but I don't think it's changed massively. When I looked, the lightest 75hp plus engine you'll get is the Evinrude 75/90 ETEC at 145kg. Over 90hp ant the ETEC jumps to 177kg. The next up was the Tohatsu TLDi 90hp at 150kg then the mariner/Merc 75-115hp 4 strokes at 163kg.

As mentioned, I'd be doubtful of the figures as my old mariner 75 clamshell 2 stroke was 130kg.

Phil

JohnW · 17 June 2019, 18:13

Quote:

Originally Posted by beamishken

Are you 100% sure those figures are correct? If they are it would appear that tornado speced their transom for an engine that doesnt exist
Perhaps they anticipated engines getting lighter but I suspect the figures are wrong

Got them from Tornado direct.

beamishken · 17 June 2019, 18:46

If its an old tornado and you got the info from the current builders then its possibly wrong as the company changed hands. The original owner of the tornado companies son posts on here from time to time they now build the kracken ribs. It maybe worth speaking to him.
I cant believe they built a boat and rated the transom for an engine you can't buy.

JohnW · 17 June 2019, 19:26

Quote:

Originally Posted by beamishken

If its an old tornado and you got the info from the current builders then its possibly wrong as the company changed hands. The original owner of the tornado companies son posts on here from time to time they now build the kracken ribs. It maybe worth speaking to him.
I cant believe they built a boat and rated the transom for an engine you can't buy.

I think its about 18 years old now, but the info on the current website confirms.
Krakens website isnt working at the moment. Do you know his name?

http://www.rib.net/forum/images/sk/attach/jpg.gif

beamishken · 17 June 2019, 20:42

Gaz millet 07712266962 is the guy to speak to

The answer is possibly in the brochure you posted, theres mistakes immediately
Capacity 120kgs thats 1 fat bloke and his dog not 8 persons.
Engine 150hk/130kg longshaft but 195kg for xl so It's either a mistake or they think a heavy standard shaft will push the transom too low for the available freeboard hence the extra weight capacity of the xl. Its not saying the transom isn't strong enough for the weight.
Three options in my opinion
1) modify the transom to fit an XL.
2)ballast the boat to the weight of your chosen engine and see if the freeboard suits your needs
3) fit a standard shaft engine and build a transom well to increase freeboard (assuming the engine isnt too low at rest)
But I'd speak to the original builder first

nworthy · 17 June 2019, 21:37

Funny you mention this, I'm looking at a 5.8 Tornado which currently has a 140 2stroke on it, plate says as you mentioned, a 150hp engine. (British built tornado)

Did want to ask the same question of weight of a 4stroke to see if it would benefit from a engine change or just stick with the tohatsu 140.