Reply
 
Thread Tools Search this Thread
 
Old 28 September 2010, 21:21   #21
DM
RIBnet supporter
 
Country: UK - England
Boat name: Little Wing
Make: Searider 5.4
Length: 5m +
Engine: Tohatsu 90
Join Date: Aug 2002
Posts: 1,069
Quote:
Originally Posted by willk View Post
60 hp equivalent is yer lot.
In my experience, that rule of thumb argument about twins being the lesser of the whole doesn't always pan out.

Having said that, Yam/Tohatsu 90 everytime for a 5.4. Mid mount the tanks and a 115 V4 does the business.
__________________
DM is offline   Reply With Quote
Old 28 September 2010, 21:24   #22
DM
RIBnet supporter
 
Country: UK - England
Boat name: Little Wing
Make: Searider 5.4
Length: 5m +
Engine: Tohatsu 90
Join Date: Aug 2002
Posts: 1,069
Quote:
Originally Posted by willk View Post
There's no contest, performance wise.
Osprey Viper 5.2 with single 100hp = 35 knots

Osprey Viper 5.2 with 2 x 60 = 38 knots

You're right, no contest.
__________________
DM is offline   Reply With Quote
Old 28 September 2010, 21:29   #23
Member
 
chewy's Avatar
 
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
Quote:
Originally Posted by Pikey Dave View Post
Chewy, oxymoron
Your never from Yorkshire using words with an "x" in!
__________________
chewy is offline   Reply With Quote
Old 28 September 2010, 21:31   #24
RIBnet Supporter
 
willk's Avatar
 
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,666
Quote:
Originally Posted by chewy View Post
Your never from Yorkshire using words with an "x" in!
YorXire!
__________________
willk is offline   Reply With Quote
Old 28 September 2010, 21:32   #25
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
Quote:
Originally Posted by chewy View Post
Some SR5.4's were rated to 115hp.....
Only JSP's



......and that was what JSP rated it at, 'cos someone had fitted a 115 to it before he bought it.


Here's another thought:
Soozook DT90: not many of them around, but if you could find one, it would be a super motor on a SR5.4. It's a 60 deg V4, 1.5 litre, good on juice and bags of grunt. Basically a de-tuned DT100, produced in the mid to late '90s to replace the ageing DT85, before Soozook went all 4-stroke on us.

There again, you could go for a Twatsoo TLDi, Opti or E-tec, if you want a modern 90hp 2-stroke. The new(ish) Soozook DF90 is relatively light if you want a 4-stroke.

Now, have I left anything out?
__________________
Downhilldai is offline   Reply With Quote
Old 28 September 2010, 21:32   #26
Member
 
colcreate's Avatar
 
Country: UK - England
Town: Cheshire
Boat name: Gollione
Make: Avon Searider 5.4
Length: 5m +
Engine: 90hp
Join Date: Jun 2010
Posts: 347
RIBase
Thanks DM, one vote for the twins then!
I wonder what insurers would say about overpowering a SR with the 115hp I know it's often done but could it be a problem?
Has anybody got true performance figures for a Yam90 5.4?
__________________
colcreate is offline   Reply With Quote
Old 28 September 2010, 21:33   #27
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 11,864
RIBase
Quote:
Originally Posted by DM View Post
Osprey Viper 5.2 with single 100hp = 35 knots

Osprey Viper 5.2 with 2 x 60 = 38 knots

You're right, no contest.
how did other factors compare? Holeshot, planing speed, time to plane, WOT etc, it's not always about top end
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:Don't feed the troll
Pikey Dave is offline   Reply With Quote
Old 28 September 2010, 21:33   #28
Member
 
chewy's Avatar
 
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
Quote:
Originally Posted by Downhilldai View Post
Only JSP's



......and that was what JSP rated it at, 'cos someone had fitted a 115 to it before he bought it.

Lol, theys a pic kicking about of an SR5.4 with a CE plate rated to 115hp.
__________________
chewy is offline   Reply With Quote
Old 28 September 2010, 21:36   #29
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
Quote:
Originally Posted by chewy View Post
Lol, theys a pic kicking about of an SR5.4 with a CE plate rated to 115hp.
What boat was the CE plate fitted to originally?
__________________
Downhilldai is offline   Reply With Quote
Old 28 September 2010, 21:39   #30
Member
 
chewy's Avatar
 
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
Quote:
Originally Posted by Downhilldai View Post
What boat was the CE plate fitted to originally?
Well it had Avon and Searider 5.4m stamped on it....
__________________
chewy is offline   Reply With Quote
Old 28 September 2010, 21:40   #31
DM
RIBnet supporter
 
Country: UK - England
Boat name: Little Wing
Make: Searider 5.4
Length: 5m +
Engine: Tohatsu 90
Join Date: Aug 2002
Posts: 1,069
Quote:
Originally Posted by Pikey Dave View Post
how did other factors compare? Holeshot, planing speed, time to plane
Dunno. I've never owned a watch.

Quote:
Originally Posted by Pikey Dave View Post
it's not always about top end
No, it's not and it's not always about redundancy and manouvrebility either. Twins give better low down torque but more important in a small boat, better lateral stability.
__________________
DM is offline   Reply With Quote
Old 28 September 2010, 21:44   #32
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
Quote:
Originally Posted by chewy View Post
Well it had Avon and Searider 5.4m stamped on it....
A bit of 'trick photography' by JSP
__________________
Downhilldai is offline   Reply With Quote
Old 28 September 2010, 21:45   #33
DM
RIBnet supporter
 
Country: UK - England
Boat name: Little Wing
Make: Searider 5.4
Length: 5m +
Engine: Tohatsu 90
Join Date: Aug 2002
Posts: 1,069
Quote:
Originally Posted by Downhilldai View Post
......and that was what JSP rated it at
Being a welsh person, I thought you would know that the 5.4 was originally rated at 115 til some one who shall remain nameless blew the transom off one by fitting a Yam 130 V4 so the 115 was a compromise
__________________
DM is offline   Reply With Quote
Old 28 September 2010, 21:47   #34
Member
 
colcreate's Avatar
 
Country: UK - England
Town: Cheshire
Boat name: Gollione
Make: Avon Searider 5.4
Length: 5m +
Engine: 90hp
Join Date: Jun 2010
Posts: 347
RIBase
OK exploring options here, what are a matched pair of Mariner 40 longshafts worth Elec and manual start, oil injection complete with all cables and controls. Exceptionally tidy condition, been in storage for years.
Attached Thumbnails
Click image for larger version

Name:	Boat enginesx2.jpg
Views:	171
Size:	151.2 KB
ID:	54537  
__________________
colcreate is offline   Reply With Quote
Old 28 September 2010, 21:48   #35
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
Quote:
Originally Posted by DM View Post
Being a welsh person, I thought you would know that the 5.4 was originally rated at 115 til some one who shall remain nameless blew the transom off one by fitting a Yam 130 V4 so the 115 was a compromise
Was that the prototype model, before fibreglass was invented?
__________________
Downhilldai is offline   Reply With Quote
Old 28 September 2010, 21:51   #36
DM
RIBnet supporter
 
Country: UK - England
Boat name: Little Wing
Make: Searider 5.4
Length: 5m +
Engine: Tohatsu 90
Join Date: Aug 2002
Posts: 1,069
Quote:
Originally Posted by Downhilldai View Post
Was that the prototype model, before fibreglass was invented?
Silly boy. It was one of Wales finest.

ps Have you measured your 4.7
__________________
DM is offline   Reply With Quote
Old 28 September 2010, 21:52   #37
Member
 
chewy's Avatar
 
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
Quote:
Originally Posted by Downhilldai View Post
Was that the prototype model, before fibreglass was invented?
Had a CE plate on so would have been a production model?
DM I owe you a pint, come to think of it theys still a bottle waiting here for you from my favoutrite Welshman.
__________________
chewy is offline   Reply With Quote
Old 28 September 2010, 21:53   #38
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
Quote:
Originally Posted by colcreate View Post
OK exploring options here, what are a matched pair of Mariner 40 longshafts worth Elec and manual start, oil injection complete with all cables and controls. Exceptionally tidy condition, been in storage for years.
I'd say around £600 - £700 each. Would suit an SR4 nicely and there's always guys resurrecting them.

The market for selling them as a pair would be limited.
__________________
Downhilldai is offline   Reply With Quote
Old 28 September 2010, 21:53   #39
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 11,864
RIBase
Osprey Viper 5.2 with single 100hp = 35 knots

Osprey Viper 5.2 with 2 x 60 = 38 knots

You're right, no contest.



Quote:
Originally Posted by DM View Post
Dunno. I've never owned a watch.



No, it's not and it's not always about redundancy and manouvrebility either. Twins give better low down torque but more important in a small boat, better lateral stability.
I agree, but you didn't mention that initially, you highlighted the top end performance difference
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:Don't feed the troll
Pikey Dave is offline   Reply With Quote
Old 28 September 2010, 21:55   #40
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
Quote:
Originally Posted by DM View Post
ps Have you measured your 4.7
Could I borrow your tape? I quite fancy owning an SR5.1
__________________
Downhilldai is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 09:15.


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