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Old 25 March 2019, 05:53   #1
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40 or 50 for Tornado 4.8

Seeking advise and opinions for the next engine... Getting tired of carbs so looking to upgrade from 4stroke carburated to 4 stroke EFI on a Tornado 4.8.

In-budget EFI options 40,50,60 hp but the best offer looks like to be a newer than others 40hp Mercury EFI. Will there be a noticable difference between 40 and 50? Or would it be better to go for 60
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Old 25 March 2019, 07:36   #2
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60
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Old 25 March 2019, 08:31   #3
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40 or 50 for Tornado 4.8

If budget allows I’d go 60 also. The Merc 50 is the same 995cc 4 cyl block as the 60 so won’t be far behind as torque will be similar. Most Merc 40’s are the 747cc 3 cyl blocks although I think Mercury did also do a 995cc 4 cyl version.

We have a Mariner 60 on our 5m XS and performance is fine, although wouldn’t want any less. Propped for towing, but lightly loaded it tops out at 33/34kn and cruises all day at 22/23kn at 4000/4500rpm.
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Old 25 March 2019, 19:01   #4
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60hp every time or whatever the transom rating is. I've got a Tohatsu carbed 60hp tweaked to 70hp on the back of my RIBcraft 4.8. Runs fine with 15" pitch prop, but perfect with a 17" pitch. All depends on weight of boat, number of people on board and what you want from it.
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Old 26 March 2019, 01:00   #5
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ok this is really helpful no votes for a 40 and as 50 and 60 have the same price and weight I guess its going to be 60 then. But the steering cable is only rated for 55hp is that going to be a problem? Or do I need new steering as well and if so which one..
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Old 26 March 2019, 04:44   #6
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as a comparison i had a 50 hp evinrude two stroke on this and it planed well with 4 up i changed to the 60 hp yamaha high thrust four stroke it was mind blowingly fast.
as spartacus states go as big as possible if budget allows
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Old 26 March 2019, 08:37   #7
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Have 60 hp on a 4.9 m valiant rib I have to agree that 60 hp is a good size match for this size of a boat

Tsm
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Old 27 March 2019, 08:26   #8
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I have a zodiac mk2 futura sib. I found a used merc 40 efi the performance was disappointing. It really was a buzz kill to my excitement I had for my new boat. Sold it and got etec60. Now I love my boat.
“More is More”
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Old 30 March 2019, 06:09   #9
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I'd always go for the largest engine you can afford within the hull / transom rating for general use (different if say a safety boat on a lake).

If you go for less you'll always be wondering "what would it have been like if I'd gone for the extra HP?"

Extra power is always useful to have in reserve
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Old 02 April 2019, 07:36   #10
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I have a 60hp on my 4.5 Rib, a 15 HP on my 3.6 Rib and 115hp on each of a pair of 5.2 m Fletcher bow riders.

Based on this I agree with most others on here that on a 4.8 m Rib if buying new I would go for a 60hp. 50hp would be ok but you would be missing out on the WOW factor as you push the throttle forward.

On my 4.5 m Rib (60hp) at Full throttle it is a little scary and you tend to throttle back a bit. I think you need this feeling to really enjoy your toys

On the other side of the coin I have a 135 hp inboard in a 19ft sports cruiser and I sort of always feel I would like more power

In short go for the 60 yolu will not regret it
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