Reply
 
Thread Tools Search this Thread
 
Old 15 December 2004, 07:52   #1
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
Mercury 90 4 Stroke.

Anyone give me info on the above (circ. 2000), ie: max fuel usage at WOT, reliability and if there is an online manual that I can use?

Andy
__________________

__________________
Hightower is offline   Reply With Quote
Old 15 December 2004, 07:57   #2
Member
 
Country: UK - England
Town: New Forest Hampshire
Boat name: Moonshine
Make: Jeanneau Sun 2000
Length: 6m +
Engine: Honda 6hp
Join Date: Feb 2004
Posts: 138
Quote:
Originally Posted by Hightower
online manual that I can use?

Andy
Tue had some real paper workshop manuals for 15 :

Workshop manuals

Cheers

Phil
__________________

__________________
philip is offline   Reply With Quote
Old 15 December 2004, 08:01   #3
tue
Member
 
Country: UK - England
Town: Paignton, Devon
Make: Chinook and Viking
Length: 7m +
Engine: 150 Etec + 125 Merc
Join Date: Jul 2003
Posts: 526
We have one on our dive club RIB and its fantastic. I can't give you fuel figures as we never worked it out but it doesn't use masses.

Reliability wise we have clocked up about 750hrs in the 3 years we've had it and we have had no problems with it at all. It gets hammered at full throttle where ever they drive it and is usually well over the top exhast outlet in water when they fill the boat with divers and it just keeps running.

The only thing I would suggest is getting hydraulic steering if its not allready fitted, as it is a heavy beast to turn and even with the No Feed Back helm it is hard to turn and keep in a straight line.
__________________
**Paul**
Brixham BSAC
tue is offline   Reply With Quote
Old 15 December 2004, 08:14   #4
DJL
Member
 
Country: UK - England
Make: Ribcraft 6.5
Length: 6m +
Engine: Suzuki DF175TG
Join Date: Apr 2002
Posts: 929
Hi Andy,

You can download the standard manual from www.marinepower.com
__________________
DJL is offline   Reply With Quote
Old 15 December 2004, 08:42   #5
DM
RIBnet supporter
 
Country: UK - England
Boat name: Little Wing
Make: Searider 5.4
Length: 5m +
Engine: Tohatsu 90
Join Date: Aug 2002
Posts: 1,067
I ran one of these for most of this season. Excellent fuel consumption, but Tue is right. It is a heavy lump for its output. It might be worth considering the extra weight over the Yamaha 80, assuming it's for your BWM.

I also found the gear selection to be a bit clunky, more so with a S/S prop on.

DM
__________________
DM is offline   Reply With Quote
Old 15 December 2004, 08:46   #6
Member
 
Country: UK - England
Town: Whitstable
Boat name: Tango
Make: Avon and Narwhal2.4m
Length: 4m +
Engine: 60HP Yamaha
Join Date: Oct 2002
Posts: 966
Quote:
Originally Posted by davidmanning
I ran one of these for most of this season. Excellent fuel consumption, but Tue is right. It is a heavy lump for its output. It might be worth considering the extra weight over the Yamaha 80, assuming it's for your BWM.

I also found the gear selection to be a bit clunky, more so with a S/S prop on.

DM
No Dave the Yam 80 is a heavy old lump too, its 30 ish Kg heavier than the 60 Yam, in this case i'd suggest there wouldn't be that much difference between the Yam 80 and the 90 merc weight wise.

Lord D will know doubt be able to give us the accurate figures
__________________
Bilge Rat is offline   Reply With Quote
Old 15 December 2004, 09:41   #7
tue
Member
 
Country: UK - England
Town: Paignton, Devon
Make: Chinook and Viking
Length: 7m +
Engine: 150 Etec + 125 Merc
Join Date: Jul 2003
Posts: 526
We are talking 90 fourstoke. So V heavy lump
__________________
**Paul**
Brixham BSAC
tue is offline   Reply With Quote
Old 15 December 2004, 09:45   #8
DM
RIBnet supporter
 
Country: UK - England
Boat name: Little Wing
Make: Searider 5.4
Length: 5m +
Engine: Tohatsu 90
Join Date: Aug 2002
Posts: 1,067
Quote:
Originally Posted by Bilge Rat
in this case i'd suggest there wouldn't be that much difference between the Yam 80 and the 90 merc weight wise.
My understanding is that the Yamaha AETOL eighty is a twostroke with a weight of approx 120kg. The Merc four stroke is about 180kg. That's enough weight difference hanging outside the transom of a sub 6M boat to turn it from a sweet handling set up into a dog. Add in the fact that the Merc is a taller engine which will alter the C of G.

DM
__________________
DM is offline   Reply With Quote
Old 15 December 2004, 10:38   #9
Member
 
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 10hp Yam / 150hp opt
Join Date: Sep 2003
Posts: 1,894
RIBase
Fuel Consumption

Jools on Panther has one of these on his Ribcraft 585.

He used about the same amount of fuel at cruising speeds on the BIBOA SW cruise as my 90hp 2 stroke did on my 5.4 Seraider - a bit under 1 litre per mile, say about 0.9l / mile.
Made me feel very smug

Dont forget the 90 four stroke is on carbs and so is not going to be the best on fuel consumption.

Out of interest the 150hp Optimax on my 6.5 Scorpion also uses just under a litre per mile.

Not sure how much / little the 4 stroke would use at WOT
__________________
Searider is offline   Reply With Quote
Old 15 December 2004, 10:56   #10
Member
 
Country: UK - England
Town: Whitstable
Boat name: Tango
Make: Avon and Narwhal2.4m
Length: 4m +
Engine: 60HP Yamaha
Join Date: Oct 2002
Posts: 966
Quote:
Originally Posted by davidmanning
My understanding is that the Yamaha AETOL eighty is a twostroke with a weight of approx 120kg. The Merc four stroke is about 180kg. That's enough weight difference hanging outside the transom of a sub 6M boat to turn it from a sweet handling set up into a dog. Add in the fact that the Merc is a taller engine which will alter the C of G.

DM

Ah ha now i thought we were talking about 4 stroke not 2 stroke, this does change things somewhat doesn't it
__________________

__________________
Bilge Rat 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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 08:24.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.