Reply
 
Thread Tools Search this Thread
 
Old 05 June 2008, 12:00   #1
Member
 
Country: UK - England
Town: Highcliffe
Boat name: No Name
Make: Ocean
Length: 4m +
Engine: Johnson 50 4-Stroke
Join Date: Jul 2006
Posts: 39
Fuel usage help

Hi,

please could you help..... i have a 1990 or a 1998(im not sure) 40hp Mariner electric start and trim engine. The fuel usage is completely apauling like 28 in 5hrs of going 4 knots!!! THIS CANT BE RIGHT!!! Please can someone advise on what they think about sorting it out so its more economic!!

Thanks,

Alex
__________________

__________________
ali_seton is offline   Reply With Quote
Old 05 June 2008, 12:22   #2
Member
 
Nick Hearne's Avatar
 
Country: UK - England
Town: Bucks
Boat name: Blue & Ding Dong
Make: Ribeye,SR4 & Bombard
Length: 6m +
Engine: 115,50 & 15Hp Yams
Join Date: Feb 2004
Posts: 3,242
I work that out to be 1.25Lt per mile so not that bad, how big is the boat?
__________________

__________________
Nick Hearne is offline   Reply With Quote
Old 05 June 2008, 13:22   #3
Member
 
Country: Other
Town: San Carlos, Mexico
Boat name: INDE
Make: LOMAC 730
Length: 7m +
Engine: 200 Merc.
MMSI: Please press 1
Join Date: May 2006
Posts: 1,688
Send a message via Skype™ to Limey Linda
Quote:
Originally Posted by ali_seton View Post
Hi,

please could you help..... i have a 1990 or a 1998(im not sure) 40hp Mariner electric start and trim engine. The fuel usage is completely apauling like 28 in 5hrs of going 4 knots!!! THIS CANT BE RIGHT!!! Please can someone advise on what they think about sorting it out so its more economic!!

Thanks,

Alex
Sounds about right to me. You should not assume that going slow is more economical. It is not as you are just pushing water. A planing hull is at it's most efficient on the plane at about 3500-4000 RPM.
__________________
Running around like a head with it's chicken cut off.
Limey Linda is offline   Reply With Quote
Old 05 June 2008, 14:50   #4
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Yep. sounds about right to me too.
__________________
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 05 June 2008, 15:19   #5
Member
 
Country: UK - England
Town: Highcliffe
Boat name: No Name
Make: Ocean
Length: 4m +
Engine: Johnson 50 4-Stroke
Join Date: Jul 2006
Posts: 39
it cant be right as when i am going at speed the boat does about 10 per 30 minutes! its a 4m rib
__________________
ali_seton is offline   Reply With Quote
Old 05 June 2008, 15:47   #6
Member
 
Country: Other
Town: San Carlos, Mexico
Boat name: INDE
Make: LOMAC 730
Length: 7m +
Engine: 200 Merc.
MMSI: Please press 1
Join Date: May 2006
Posts: 1,688
Send a message via Skype™ to Limey Linda
Quote:
Originally Posted by ali_seton View Post
it cant be right as when i am going at speed the boat does about 10 per 30 minutes! its a 4m rib
Yes, but you travel X times the distance. Fuel consumption is primarily distance related not time. Get your calculator out.
__________________
Running around like a head with it's chicken cut off.
Limey Linda is offline   Reply With Quote
Old 05 June 2008, 16:31   #7
Member
 
Country: UK - England
Town: Highcliffe
Boat name: No Name
Make: Ocean
Length: 4m +
Engine: Johnson 50 4-Stroke
Join Date: Jul 2006
Posts: 39
ok..... is there anything i can do to lower fuel usage????
__________________
ali_seton is offline   Reply With Quote
Old 05 June 2008, 16:36   #8
Member
 
Country: Other
Town: San Carlos, Mexico
Boat name: INDE
Make: LOMAC 730
Length: 7m +
Engine: 200 Merc.
MMSI: Please press 1
Join Date: May 2006
Posts: 1,688
Send a message via Skype™ to Limey Linda
Quote:
Originally Posted by ali_seton View Post
ok..... is there anything i can do to lower fuel usage????
Buy some oars
__________________
Running around like a head with it's chicken cut off.
Limey Linda is offline   Reply With Quote
Old 05 June 2008, 17:05   #9
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
My RIB does about 5mpg on tickover which is about 5mph. That is near enough 1L per mile - not so bad for a 225hp so maybe his is a little thirsty - my boat isn't exactly small either!!!
__________________
codprawn is offline   Reply With Quote
Old 05 June 2008, 17:21   #10
Member
 
Country: UK - England
Town: Highcliffe
Boat name: No Name
Make: Ocean
Length: 4m +
Engine: Johnson 50 4-Stroke
Join Date: Jul 2006
Posts: 39
no im being serious is there anything i can do to make it more fuel efficient..... my mates gt a 5.2 avon searider with a 70 autolube yamaha and it uses like half the fuel mine does!! please is there anything i can do???????
__________________

__________________
ali_seton 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 14:10.


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