Go Back   RIBnet Forums > RIB talk > Engines & props
Click Here to Login

Reply
 
Thread Tools Search this Thread
 
Old 20 July 2011, 21:23   #21
Member
 
martini's Avatar
 
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,030
Quote:
Originally Posted by steven9586 View Post

I can't buy a new 2 stroke and the SIB states 15hp max with a 55kg max weight (outboard)
You can if you ask the right people

I've got a 4.7m Zodiac with a 2 stroke mariner 50 which weighs 75kg IIRC, with 2 people it's hard work to lift on and off, if it didn't live on a trailer it'd never get used.

Small sibs really don't like too much weight down aft, I'd give serious consideration to a 2 stroke. They're so much cheaper as well
__________________
martini is offline   Reply With Quote
Old 20 July 2011, 21:51   #22
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Quote:
Originally Posted by martini

You can if you ask the right people

I've got a 4.7m Zodiac with a 2 stroke mariner 50 which weighs 75kg IIRC, with 2 people it's hard work to lift on and off, if it didn't live on a trailer it'd never get used.

Small sibs really don't like too much weight down aft, I'd give serious consideration to a 2 stroke. They're so much cheaper as well
Liking your thinking. Commercial use only ?

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
__________________
Boats&Outboards is offline   Reply With Quote
Old 20 July 2011, 21:58   #23
Member
 
actions's Avatar
 
Country: UK - England
Town: Herne Bay
Boat name: Red May
Make: Zodiac
Length: 4m +
Engine: 40hp Honda 4 Stroke
MMSI: Is quite long
Join Date: Jun 2010
Posts: 653
Send a message via Skype™ to actions
Get a two stroke all day long. Especially if you putting it in the back of the car. Your bound to put it in on the wrong side at some point and then the oil will cause an issue. A two stroke is much lighter and you can just throw it in the boot (not quite throw, that would just be silly, ).

Had a 8hp Merc 4 stroke on a sib and that was bloody heavy at 38kg, ok for a very short distance (a few feet), but soon got very tired of doing it.

Then caught the rib bug and well the rest is history...... or a re-mortgage (if i had my way), but the wife, oh the wife.
__________________
actions is offline   Reply With Quote
Old 20 July 2011, 22:47   #24
Member
 
Country: UK - England
Town: Newcastle upon Tyne
Make: Zodiac Fastroller
Length: 3m +
Engine: 15hp Mercury 2 strk
Join Date: Jul 2011
Posts: 24
OK Martini how do you find the right people?

Arnt 2 strokes a lot noisier?
__________________
steven9586 is offline   Reply With Quote
Old 20 July 2011, 22:54   #25
Member
 
Country: UK - England
Town: Newcastle upon Tyne
Make: Zodiac Fastroller
Length: 3m +
Engine: 15hp Mercury 2 strk
Join Date: Jul 2011
Posts: 24
NOS4R2

I think your wrong, i'm sure a four stroke has more torque, in fact yeah defo it has. If you look at motocross bikes a four stroke can run on tick over where as a two stroke would just stall, hence more torque.

Correct me if i'm wrong.

Steven
__________________
steven9586 is offline   Reply With Quote
Old 20 July 2011, 23:00   #26
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,898
Quote:
Originally Posted by steven9586 View Post
Correct me if i'm wrong.
Deploying Correctifier, Capt'n
__________________
willk is offline   Reply With Quote
Old 20 July 2011, 23:07   #27
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
RIBase
Quote:
Originally Posted by steven9586 View Post
NOS4R2

I think your wrong, i'm sure a four stroke has more torque, in fact yeah defo it has. If you look at motocross bikes a four stroke can run on tick over where as a two stroke would just stall, hence more torque.

Correct me if i'm wrong.

Steven
Deployed

I'll guarantee you're wrong. It's not the same deal as with motorbike engines.

See here (bigger engines, but it makes no odds)

__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 20 July 2011, 23:08   #28
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Depends on many things not just what stroke the engine is. The 2 stroke will always give quicker acceleration which together with weight will support towing better at that HP IMHO

speak again to the dealer but bear in mind he wants a sale and that cannot happen if he says 2 stroke is better!

Perhaps a compromise is in order.... Go for the 3 Stroke

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
__________________
Boats&Outboards is offline   Reply With Quote
Old 20 July 2011, 23:10   #29
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard
Make: Aerotec 380
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 3,493
Take the advice of all the posts, SIB+2S= ! Have to ask one other thing though, unless there is a *really* good reason for buying new and again being a bit of a 'stuck record' get yourself a 'used' rig from the dozens listed every week on eBay - for the dealer price of just the boat *or* the engine you will easily find a barely used boat in as new condition complete with a last generation 2 stroke and probably a trailer too from people who bought new and used it half a dozen times - if it doesn't work out then you can sell if for the same money and see if boating or that particular combination of SIB/HP is for you - most of us on here didn't get the right boat the first time.

Buy a new boat and new engine and kiss goodbye to 30% + depreciation as you load it in the car...
__________________
Max... is offline   Reply With Quote
Old 20 July 2011, 23:16   #30
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Quote:
Originally Posted by Max...
Take the advice of all the posts, SIB+2S= ! Have to ask one other thing though, unless there is a *really* good reason for buying new and again being a bit of a 'stuck record' get yourself a 'used' rig from the dozens listed every week on eBay - for the dealer price of just the boat *or* the engine you will easily find a barely used boat in as new condition complete with a last generation 2 stroke and probably a trailer too from people who bought new and used it half a dozen times - if it doesn't work out then you can sell if for the same money and see if boating or that particular combination of SIB/HP is for you - most of us on here didn't get the right boat the first time.

Buy a new boat and new engine and kiss goodbye to 30% + depreciation as you load it in the car...
What about my 3 stroke ?

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
__________________
Boats&Outboards is offline   Reply With Quote
Old 20 July 2011, 23:18   #31
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
RIBase
Quote:
Originally Posted by Boats&Outboards View Post
What about my 3 stroke ?

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
Suck squeeze bang,suck squeeze bang,suck squeeze BOOM?
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 20 July 2011, 23:19   #32
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Quote:
Originally Posted by steven9586
OK Martini how do you find the right people?

Arnt 2 strokes a lot noisier?
I think your still able to buy provided it's for commercial use. It has to be registered as this from new and if sold on used at a later point it can only be for commercial use again. How that works in practice I don't know.

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
__________________
Boats&Outboards is offline   Reply With Quote
Old 20 July 2011, 23:20   #33
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard
Make: Aerotec 380
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 3,493
Suck, squeeze, bang, blow - which one would you leave out?!

TBH, never really knew how a 2 stroke works compared to a 4 stroke (just that's it better for a SIB I've learnt) - anyone explain the 2 St please?

[edit] NOS, you type faster than me....
__________________
Max... is offline   Reply With Quote
Old 20 July 2011, 23:21   #34
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Quote:
Originally Posted by Nos4r2

Suck squeeze bang,suck squeeze bang,suck squeeze BOOM?
There's me thinking I had the next generation all sorted. Back to the drawing board!

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
__________________
Boats&Outboards is offline   Reply With Quote
Old 20 July 2011, 23:22   #35
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Quote:
Originally Posted by Max...
Suck, squeeze, bang, blow - which one would you leave out?!

TBH, never really knew how a 2 stroke works compared to a 4 stroke (just that's it better for a SIB I've learnt) - anyone explain the 2 St please?

[edit] NOS, you type faster than me....


Watch and learn, kind of.

Peter @ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
__________________
Boats&Outboards is offline   Reply With Quote
Old 20 July 2011, 23:25   #36
Member
 
martini's Avatar
 
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,030
Quote:
Originally Posted by Boats&Outboards View Post
Liking your thinking. Commercial use only ?


Quote:
Originally Posted by steven9586 View Post
OK Martini how do you find the right people?

Arnt 2 strokes a lot noisier?
Many dealers aren't that fussed if you're commercial or not, they just want your wonga. As long as you sign the bit of paper saying you're commercial which then gets filed in some manuf's archive storage unit somewhere never to be looked at again...
__________________
martini is offline   Reply With Quote
Old 20 July 2011, 23:36   #37
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard
Make: Aerotec 380
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 3,493
That's an interesting vid - makes you wonder how much more advanced 2 strokes could have become if manufacturers had really wanted to overcome the emissions issue and seriously develop/refine them further...
__________________
Max... is offline   Reply With Quote
Old 20 July 2011, 23:38   #38
Member
 
martini's Avatar
 
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,030
Quote:
Originally Posted by Max... View Post
That's an interesting vid - makes you wonder how much more advanced 2 strokes could have become if manufacturers had really wanted to overcome the emissions issue and seriously develop/refine them further...
Ask Gotchiguy
__________________
martini is offline   Reply With Quote
Old 20 July 2011, 23:43   #39
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
RIBase
Quote:
Originally Posted by martini View Post
Ask Gotchiguy
Oh, god no...
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 21 July 2011, 00:15   #40
Member
 
kubcat's Avatar
 
Country: Australia
Town: Sydney
Boat name: Lunasea
Make: Ribtec 890SX
Length: 8m +
Engine: Yamaha ME 421STI x 2
Join Date: Aug 2009
Posts: 475
Quote:
Originally Posted by steven9586
NOS4R2

I think your wrong, i'm sure a four stroke has more torque, in fact yeah defo it has. If you look at motocross bikes a four stroke can run on tick over where as a two stroke would just stall, hence more torque.

Correct me if i'm wrong.

Steven
Don't know about motorbikes but after getting sick of breaking 4 stroke Mercurys we put a pair of 1980's Evinrudes on a big monohull and it goes faster, gets on the plane quicker but uses more fuel and is noisier.

Selling two 4 strokes even with one broken and in pieces gave my mate a lot of fuel money.

We have seen it before though, same boat, same horsepower, the 2 stroke is quicker on the plane. I don't know if it is the extra weight on the transom or they are gutsier but I think there is more to the story than just the 'statistics'.
__________________
kubcat is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




All times are GMT. The time now is 06:28.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.