LPG Forum


All times are UTC



Post new topic Reply to topic  [ 46 posts ]  Go to page Previous  1, 2, 3
Author Message
PostPosted: Thu Dec 29, 2011 6:31 pm 
Advanced Member

Joined: Wed Apr 09, 2008 9:00 am
Posts: 7882
Images: 0
Location: Peterborough
Mine does...... It tunes the default no matter what the revs are.

_________________
'96 Saab 900XS, AEB Leo, sold
'93 Range Rover 4.2 LSE, Lovato LovEco, sold
'98 Ex-Police Range Rover 4.0, Singlepoint AEB Leo, my daily motor
'97 Range Rover 4.0SE, eGas multipoint, a project.....

Proud to be a member of the YCHJCYA2PDTHFH club.


Top
 Profile  
Reply with quote  
PostPosted: Fri Dec 30, 2011 10:02 am 
Installer

Joined: Wed May 23, 2007 5:51 pm
Posts: 8096
Images: 0
Location: Wiltshire
SimonHobson wrote:
Actually it doesn't tune itself at idle.

Not convinced about that, but this Leo doesn't know when its at idle ...

_________________
www.blazegas.com


Top
 Profile  
Reply with quote  
PostPosted: Tue Sep 03, 2013 9:03 pm 
New member

Joined: Sat Aug 31, 2013 2:36 pm
Posts: 70
Images: 0
Sounds an awful lot of faffing about to me. An engineer I was talking to recently told me how his fuelling is done by using the su itself to draw the gas in -by connecting the gas in at the bottom of the su where the jet holder used to be. Sounds like a grand idea.
Not sure what the lpga would say about it though "not an approved part sir" ....
Huw


Top
 Profile  
Reply with quote  
PostPosted: Tue Sep 03, 2013 10:08 pm 
Advanced Member

Joined: Wed Apr 09, 2008 9:00 am
Posts: 7882
Images: 0
Location: Peterborough
No, but that's almost exactly what a Blos gas carb is. Something very similar to an SU but with the gas feed going in the bottom.

_________________
'96 Saab 900XS, AEB Leo, sold
'93 Range Rover 4.2 LSE, Lovato LovEco, sold
'98 Ex-Police Range Rover 4.0, Singlepoint AEB Leo, my daily motor
'97 Range Rover 4.0SE, eGas multipoint, a project.....

Proud to be a member of the YCHJCYA2PDTHFH club.


Top
 Profile  
Reply with quote  
PostPosted: Wed Sep 04, 2013 7:12 am 
Intermediate Member

Joined: Sat Aug 23, 2008 5:39 pm
Posts: 1129
Location: Cumbria
In principal not hard to do at all.
Just remove the innards of the float chamber (and seal off the vents/overflow etc), make a larger jet and needle (you need a metering needle as it's a variable orifice), and connect the gas supply to the float chamber. And then tune it !
Should be able to do away with the in-line restrictor (power valve) as the needle & jet can take that role.

I guess for some people interested in trying to keep as much of the authentic look as possible it would be worth it. As Gilbertd says, you can buy "gas carbs" and it's probably easier to adapt an inlet manifold than the SU carb.

For other types of carb, people have done it with a spud pipe - literally just a piece of pipe sticking into the intake where pressure is depressed, ie into the venturi. For fixed orifice carbs, that's the simplest way to convert them.

The biggest downside of removing petrol components is that you have then completely lost the ability to switch to petrol. As someone with long term experience of having a gas-only vehicle, that can be a tad inconvenient if you travel around a bit.
Nothing quite beats the anxiety of finding one filling station out of gas, and doing an "economy drive" to the next one - knowing that according to your calculations you probably won't make it ... (I did, but with dry tanks :shock:)
Or you end up carting a big red cylinder and hand pump with you. Not too bad in something large like a 110 or Discovery - probably not very practical for most cars.

_________________
Land Rover 110 V8 LPG
Land Rover 90 petrol (no longer diseasel :D), still awaiting V8 & LPG
http://www.diy-lpg.co.uk


Top
 Profile  
Reply with quote  
PostPosted: Fri Sep 06, 2013 7:48 pm 
New member

Joined: Fri Mar 18, 2011 3:44 pm
Posts: 60
Location: Lincs
I've just seen this old post of mine resurrected for some reason!

To update you on the car, I built it with two fuel systems and two ignition systems for reliability and alternatives when touring, UK or Europe.

The car has been running very well after a few more changes, I fitted a set of iridium plugs to get more longevity from them, a very good Jaguar friend gave better ignition advance figures for LPG and petrol for the switchable ECU and I binned the new cheap Lambda probe and went to another friends scrap yard and took second hand probes from ford escorts to test plus the corresponding plug (so that a ring spanner would go over the plug to remove the probe from the exhaust).

Also plumbed the vacuum advance pipe directly into the manifold rather than the carburettor as per the distributor connection.

I tried about 3 Bosch and 3 NTK probes and found the Bosch leaned off the mixture but the NTK kept it in the right place. Still running on the old NTK probe with 2 spares in the boot.

The only real problem of late was coming back from Birmingham on the A/M42 and M1 and two petrol stations had broken LPG pumps so ran on petrol at 18mpg! and motorway prices.

Brian


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 46 posts ]  Go to page Previous  1, 2, 3

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group