What size outboard on 5.5 mtr plate
Submitted by Katman on Wed, 2021-01-06 19:15
Hi guys
I have a 5.5 mtr Searider that currently has a Johnson 115hp 2 stroke
I am looking into repowering with a 4 stroke, either 135 or 150 hp if I can get away with it
The hull does not have an ABP and I am just talking to a marine builder about getting it specced for one.
What 5.5 mtr hull do you guys have, what size 4 stroke and are you happy with the power
Cheers
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ranmar850
Posts: 2702
Date Joined: 12/08/12
150 Merc FTW
Or 130 Yamaha. or 140 Suzuki, plenty of choice, the Merc will outperform either of the others, check the weight allowed on your transom, Merc is only a little heavier than the other two lesser HP, lower capacity jobs.
lightest version of each- Merc 150 208 kg, Yamaha 178 KG, Suzuki 186kg. Merc is 3000cc displacement suzuki 2044 cc, Yamaha is 1832 cc. Merc as a clear displacement advantage , for little more weight, this comes through as grunt and the ability to swing a bigger prop, and feel load less at the same time.
Your Johnno was likely about 140 kg.
sea-kem
Posts: 14972
Date Joined: 30/11/09
Nice info Ranmar
Nice info Ranmar
Love the West!
SeperateKnob
Posts: 668
Date Joined: 28/11/16
Going from an old 115 to new
Going from an old 115 to new 150 is a huge jump in power. I would be hesitant to put an additional 70kg hanging off the transom. A 130 would be perfect
Katman
Posts: 35
Date Joined: 22/08/14
Thanks for the feedback, yes
Thanks for the feedback, yes I am thinking the Merc 135 may be a better choice
Am just concerned that the 4 stroke won't have same grunt if the 2 stroke but I haven't actually been out in a boat with a 4 stroke
Just waiting to see what the assessor suggests as max hp
pelagicyachts
Posts: 1322
Date Joined: 23/02/11
hp is hp.... 115hp two
hp is hp.... 115hp two stroke is same as 115hp 4 stroke :-)
4 strokes have come a long way in the last 15/20 years the early ones did not have the hole shot of two strokes which is where the misconception has stuck that you need more 4st hp than 2 stroke to get the same performance
Any current model 4 stroke (same hp or higher) is going to outperform your current motor
dano83
Posts: 790
Date Joined: 25/05/12
I've got twin 75 etecs on my
I've got twin 75 etecs on my 5.8 ocean hull not much bigger boat but it is a 6mm hull...2x75 weighs 290kg so you would be close to a 150 on the searider I'd assume
i get around 37 knots tops
Fletch
Posts: 78
Date Joined: 25/03/13
150 Merc
I put a 150 Merc on my 5.5m Fish Hunter. it's awesome
rob90
Posts: 1526
Date Joined: 06/02/13
Nice rig, ive got a soft
Nice rig, ive got a soft spot for those sea riders, with a new motor it will be a weapon.
Hi my name is rob............. and I'm a........... fishaholic
Katman
Posts: 35
Date Joined: 22/08/14
Okay got word back from boat
Okay got word back from boat builder today that they will provide an ABP that certifies 150hp and 6 people
Old Johnson came in at 177kg and Mercury 150 is 208kg
Should level boat out a bit as it sits a little bum high currently
Been told there is a wait of up to 3 months to get the new motor
SeperateKnob
Posts: 668
Date Joined: 28/11/16
Should work out nicely then.
Should work out nicely then. It’s going to be a rocket ship haha. What does a 150 set you back?
Katman
Posts: 35
Date Joined: 22/08/14
That's the bit that bites a
That's the bit that bites a little
The Mercury comes in at around 21k fitted with a SS prop and higher spec electronic gauges
Still it will be my last boat and the new motor should see me out given that the old Johnson lasted for about 24 years
SeperateKnob
Posts: 668
Date Joined: 28/11/16
Yeah for sure but we’ll worth
Yeah for sure but we’ll worth it. I’m looking down the barrel in the next couple of years to buy a new 250
tiles
Posts: 14
Date Joined: 12/09/13
Mate ive got a 560
Mate ive got a 560 trailcraft sportscab its got a 90hp 2 stroke merc on it im looking to up grade to a 115 4 stroke mercury i would of fort a 150 on the back would rip the arse end off if not having a heart attack over the price of a 150 first
Katman
Posts: 35
Date Joined: 22/08/14
Hi TilesYour trail craft has
Hi Tiles
Your trail craft has a max hp rating of 135 from factory and that is with a 2.1 mtr beam
The Searider has a 2.4 mtr beam so I imagine weighs a little heavier again
I am not one to run my boat at WOT much anyway, let's be honest our sea conditions don't often allow it
What I am after is the ability to handle a bit more weight when I take a few mates out
I also figure that economy and engine life will improve if I am not running the motor high in the rev range all the time
And yes the price is up there but I can justify it
Cheers
tiles
Posts: 14
Date Joined: 12/09/13
Hi KatmanFew good points
Hi Katman
Few good points there still the price of boat motors does my head in
ranmar850
Posts: 2702
Date Joined: 12/08/12
Yes, you can buy a whole new car
For the price of a modest outboard. Economies of scale, I guess.
straith
Posts: 421
Date Joined: 25/11/13
Lol last car i drove to
Lol last car i drove to rotto sank.... just sayin
ranmar850
Posts: 2702
Date Joined: 12/08/12
well, you gain points for at least trying