Thread Tools Search this Thread
Old 12 January 2007, 15:43   #1
Country: Ireland
Length: 5m +
Join Date: Nov 2006
Posts: 90
60hp four stroke on 4.9m rib

Has anyone any advice , is a 60hp four stroke Mariner too heavy for a 4.9m rib
I have seen on here where a lot of people think that two stroke performs better. Has anyone such an engine on a rib that size and what is their view, thanks in advance.

davis is offline   Reply With Quote
Old 12 January 2007, 16:35   #2
Country: UK - England
Make: Ribcraft 6.5
Length: 6m +
Engine: Suzuki DF175TG
Join Date: Apr 2002
Posts: 929
I had the Merc F60 EFI on a 4.7m Tornado. The EFI four stroke performed much better than the carburetted Merc two stroke 60 I had previous.

Weight wasn't a problem at all (only 10kg between the 4 and 2 stroke).

DJL is offline   Reply With Quote
Old 12 January 2007, 17:45   #3
Country: UK - England
Town: Aylesbury
Length: no boat
Join Date: Jul 2006
Posts: 345
Weight wise, I'm sure someone will be able to answer your question here exactly if you can give details of the RIB you have/are looking at.

I would say on a 4.9/5m RIB a 60 four stroke would be the optimum choice. Mine is only just 4.5m and have seen 32+ knots across a bumpy solent sea with two people. This year I want to see what it will 'actually' do - I'd guess around 37 knots on a smooth day maybe 39/40 if i'm lucky.

Depending on what 4.9m RIB you are sticking it on and how heavy it is with a slightly longer hull you could probably get similar if not better perfomance than this. As to 4s/2s argument, 2 strokes are cheaper to service and cost less initially but use more fuel and in my view are a pain to fill up.
wavecrosschris is offline   Reply With Quote
Old 13 January 2007, 09:04   #4
Country: UK - England
Town: Fareham
Make: Ribcraft
Length: 6m +
Engine: Suzuki 175Hp
Join Date: Oct 2006
Posts: 106
I did my PB2 on a Ribcraft 4.8 with the 4stroke mariner, didnt seem to big or heavy handled v well n quick although only 2 up
Mbryant is offline   Reply With Quote
Old 13 January 2007, 10:41   #5
martx007's Avatar
Country: UK - England
Town: Wigan
Boat name: Rosemary
Make: Yamaha
Length: 4m +
Engine: 50 Honda 4st
Join Date: Aug 2006
Posts: 64
Send a message via MSN to martx007 Send a message via Skype™ to martx007
No should be fine. My Yam 480R is rated to 75HP engine.
martx007 is offline   Reply With Quote
Old 15 January 2007, 15:00   #6
Country: UK - England
Town: Malmesbury
Boat name: Gladiator
Length: 4m +
Engine: Outboard, Petrol, 50
Join Date: Jun 2004
Posts: 39
I'm running a 4.9M RIB with a Honda BF50 engine. There's plenty of power available and I've never really felt that I need anymore.

My RIB has a Max 70HP engine rating. The thing would really fly with a 70HP engine!


Mark is offline   Reply With Quote

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

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 19:10.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.