Reply
 
Thread Tools Search this Thread
 
Old 01 August 2003, 17:59   #1
Member
 
Country: UK - England
Town: Torbay
Boat name: Marlin
Make: PBS humber 5.5
Length: 5m +
Engine: 115 optimax!!
Join Date: Jul 2003
Posts: 350
LPG RIBs

Anyone heard of LPG powered ribs anywhere? I'm still considering which is the best value for money/ value per hp solution to powering a 7m rib, which I'm soon to buy. Lots of choice for mercruisers, and they can apparently all be converted to LPG which is available at a fair few marinas on the south coast, and around most of the uk. Marine Gas sells for about 32p per litre - and you get the performance of a petrol engine. This sounds too good to be true!! Conversion costs are around 2000 - 2500.

Any experiences out there?

I run a mitsubishi L200 3 litre on LPG which works brilliantly.

Hope someone can advise.

Ribnwheels
__________________

__________________
Colin F is offline   Reply With Quote
Old 01 August 2003, 19:35   #2
Member
 
Richard B's Avatar
 
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
No direct experience, but heard a few tales...

Hamble harbourmaster converted a couple of Honda outboard powered Cheetah Catamaran hulled workboats - than converted them back after problems (allegedly).

Look on ybw.com forums (motor boat chat) and do a search on LPG. It throws up some interesting stories, and some horrors!

As far as I know, if you powered a RIB on LPG, you'd be at the bleeding edge of marine technology.
__________________

__________________
Richard B is offline   Reply With Quote
Old 02 August 2003, 04:49   #3
Member
 
Country: Canada
Town: Newfoundland
Length: no boat
Join Date: May 2000
Posts: 2,097
I did some research into this.......

I did some research into this a couple of years ago, including whether there were any LPG conversions available for 4 stroke outboards. I was advised at the time that there were but since they were low volume production from CNC machined kits they were expensive but volume production was coming. Well to the best of my knowledge this hasn't happened yet!

The other thing that reall killed it for me was tank location - needs to be vented to the air / overboard which I think would make underdeck tanks probelmatic and whether the tank would stand up to the pounding that a RIB takes.

Having decided it was a non starter I then went on to look at Diesel (numerous threads about petrol vs diesel on rib.net if you search) but decided that purchase costs for what I wanted were out of my reach. Only option then is for hitech 2 or 4 stroke outboards and accepting that 1l per mile (approx) consumption at 80p litre is the price to pay for being a petrolhead!
__________________
Alan is offline   Reply With Quote
Old 02 August 2003, 06:23   #4
Member
 
Country: UK - England
Town: West Wickham
Boat name: Aries IV
Make: Scorpion
Length: 8m +
Engine: Etec 250
MMSI: 235036477
Join Date: Dec 2002
Posts: 273
I heard the same story about the Hamble Harbourmaster's boats.

I shouldn't worry about being a "petrol-head", I doubt that there will be quite the same enthusiasm for diesel engines, when the fuel costs are similar to petrol (2006?). Have you compared the weight of a 300hp diesel to the new Yam 300 HPDI?

I appreciate that diesel is more readily available on the water in the UK/Europe, but try convincing US boaters that diesel is the way to go!

Just a thought ...

Chris.
__________________
Chris Murray is offline   Reply With Quote
Old 03 August 2003, 08:52   #5
Member
 
Country: UK - England
Town: Iver, Bucks, UK
Boat name: Prime Rib II
Make: Humber Ocean Pro
Length: 6m +
Engine: Mercruiser 1.7 diese
MMSI: 235086032
Join Date: Jul 2001
Posts: 443
I believe Ribcraft are planning an LPG boat. Whether they've actually built one yet or not I don't know but worth asking www.ribcraft.co.uk

Personally though, I would still be worried about having a pressurised fuel tank on board a RIB! Probably ways to solve all problems but while we can buy red diesel at 30p or less, I don't think they will take off. Maybe if/when that concession goes it may be different......

I think you can convert a diesel engine to LPG can't you? Not much point now - something to worry about in the future!


Mike C
__________________
Mike C is offline   Reply With Quote
Old 03 August 2003, 16:05   #6
Member
 
Country: UK - England
Town: West Wickham
Boat name: Aries IV
Make: Scorpion
Length: 8m +
Engine: Etec 250
MMSI: 235036477
Join Date: Dec 2002
Posts: 273
Oh no you can't !!!

LPG requires spark plugs, so conversion from diesel would be a bit of a problem. Quite a large problem actually !!!

Incidentally, I understand that LPG engines are usually best started on petrol, before switching to LPG. I am not really sure why, but I think it might be to do with valve lubrication. This may not apply to an LPG car, as they tend not to get "thrashed" every time they are run.

I looked into LPG for my last boat, which had a 5.7litre V8. One of my biggest concerns was that no-one at that time could supply a satisfactory stainless tank. The idea of a painted MILD STEEL tank in a salt water environment did not impress me very much.

I also felt that the marine LPG industry (there were 2 suppliers at that time) really hadn't got its act together and was probably best avoided. Things may be better now though.

BTW, LPG is less efficient than petrol but is a bit lighter.

Chris.
__________________
Chris Murray is offline   Reply With Quote
Old 03 August 2003, 19:16   #7
Member
 
Country: UK - England
Town: Iver, Bucks, UK
Boat name: Prime Rib II
Make: Humber Ocean Pro
Length: 6m +
Engine: Mercruiser 1.7 diese
MMSI: 235086032
Join Date: Jul 2001
Posts: 443
Quote:
Originally posted by Chris Murray
Oh no you can't !!!

LPG requires spark plugs, so conversion from diesel would be a bit of a problem. Quite a large problem actually !!!

Thanks for that Chris. Someone told me I could convert my diesel CAR to LPG once, (Salesman I think). I didn't think it sounded very likely at the time!

I've no intention of even thinking about doing it to my boat. I currently use half the quantity of diesel compared to the amount of petrol I used on my old boat..... so even if the tax goes on diesel, I’ll still be paying half the price I used to pay!

Mike C
__________________

__________________
Mike C 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 09:30.


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