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Old 16 July 2016, 18:36   #1
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40hp too small?

So did a quick search and can't find any relevant threads. Mby I didn't try hard enough?
I have a 5.2 Rimini rib debating a few things about what motor to go for.

The two motors I have currently are 92 40hp mariner and a 93 40hp Evinrude. I was going to put the Evinrude on my boat and just sell the mariner and buy a small aux.

But I started thinking that the 40 is probably too underpowered?

So my other idea is buy another 40hp mariner run twins and sell the Evinrude?

Basically I wanna know if it's a bad idea to just have a single 40? Because it would be much easier to just run the Evinrude.

Also looking at a 1990 Suzuki dt55 might spring for that? It's been sitting 5 years. I do most my own work so not to worried about replacing parts. I just want to have enough safe power don't really care about going real fast.

As you can see I am on a tight budget. I need to do things the cheap way but still be safe.
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Old 16 July 2016, 18:38   #2
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Do I even have enough transom space for twins?
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Old 17 July 2016, 02:24   #3
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Hi

Generally speaking you need a minimum of around 50hp/ton to get a boat onto the plane so it's going to depend on what you want to do with it. Loaded with divers and their gear It's going to struggle.
With just a couple of adults you're probably looking at the right side of 20 knots.
If your budget's tight do you want to be feeding and maintaining two engines? (probably going to have to re-prop them to get the benefit.)
I'd try it with one of the 40hp & if that's not hacking it, sell them both and get something a bit bigger.......I'd have some reservations about the 26yr old Suzuki that's lain for five years, remember outboards seldom get the opportunity to wear out, they die of neglect and not being used
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Old 17 July 2016, 02:43   #4
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RIBase
I'd be nervous about putting twins on a Rimini, my transom was suffering and that was with a single.

If it was me I'd sell the engines and add something in the 75 - 90 hp range, especially if loading with divers and people. Two of you pottering about a 50 would roll along ok.
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Old 17 July 2016, 06:03   #5
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Two 40's would give around the same performance as one 60 hp. Personaly I would be looking at a single 70 and sell the other two.

Jon
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Old 17 July 2016, 09:58   #6
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Yeah I see all your points. I am also looking at a 2000 mariner 40hp he wants 870euro. Gonna sell my Evinrude and probably grab that. I am not gonna be diving off it cause I sold all my diving equipment ;(.

Mostly gonna be fishing with 4 guys.

I can get the dt55 for about 300 so it's still tempting. It was an old speed boat engine. Been in a garage for 5 years.
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Old 17 July 2016, 10:30   #7
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If it is 4 adults you better be looking to max out the hull rating hp wise or you will struggle to get on plane.

Hang tight and do not throw good money away, something will come along.
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Old 17 July 2016, 11:25   #8
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If you dont need to ride at the maximum speed all the time you can get a smaller propeller. And by this time sell one of the 40s and wait for a good opportunities for max adviced hp
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Old 17 July 2016, 16:57   #9
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Well I sold one 40 this afternoon. The other 40 I was looking at sold so gonna take a look at the dt55. Really need something under 900 so kinda on a tiny budget.
Anything over 100hp probably would be too much for that boat?
Sorry all this Hp rating stuff and boat size is pretty new to me.
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Old 17 July 2016, 16:58   #10
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Quote:
Originally Posted by berat View Post
If you dont need to ride at the maximum speed all the time you can get a smaller propeller. And by this time sell one of the 40s and wait for a good opportunities for max adviced hp

What would a small prop do? More torque?
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