LPG Forum


All times are UTC



Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Fri May 18, 2012 8:47 pm 
New member

Joined: Thu May 17, 2012 9:40 pm
Posts: 4
hi to all...ive been working on my truck for over two years now and am bringing it out for the summer..

now its around 3.9ltr 1956 engine..nuffing flash..more like a tractor!. ive changed the gears out in the rear diff and also put a webber carb on to help it run better. ( it a little rich still) and im only doing around 14-15 mpg.

ive a speed of around 65mph..but you have to hold on tight..!!!

im looking for help to change over to lpg...im looking for someone around the cambridge area or anywhere really who knows how to make it run well, ive done a installation before on a air cooled vw...so just really need someone to help me work out what best to fit..,sell me the parts and then help final set up after i have installed it all.

any help or ideas welcome!


Top
 Profile  
Reply with quote  
PostPosted: Fri May 18, 2012 9:15 pm 
Advanced Member

Joined: Wed Apr 09, 2008 9:00 am
Posts: 7971
Images: 0
Location: Peterborough
An engine of that era, particularly an American one, will have a cast iron cylinder head and may even be a sidevalve (I know a '56 Studebaker is). In which case the valve seats will be cut straight into the cast iron. VSR will be your biggest enemy.

_________________
'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: Sat May 19, 2012 7:59 am 
New member

Joined: Thu May 17, 2012 9:40 pm
Posts: 4
Hi Gilbert thanks for the reply. the engine is over head valve and yes the cylinder head is cast..im yet to find out if. the engine has hardered valve seats..when i look on usa forums that talk of the chevy engine already having hard seat... i think not to be honest..

whats VSR stand for?

the engine is old and smelly already!!..i think if i can get it running on plg for the summer...come winter i will take the head off and get it ready for unleaded , lpg..im looking to keep the truck a long while and already have a few engines behined me.

is there any addertives / oilers i could add to help the head out?


Top
 Profile  
Reply with quote  
PostPosted: Sat May 19, 2012 8:21 am 
Advanced Member

Joined: Wed Apr 09, 2008 9:00 am
Posts: 7971
Images: 0
Location: Peterborough
VSR, Valve Seat Recession, where the valve seats and valves weld themselves together. In the days when the engine was designed, petrol was leaded and the lead protected and lubricated the valves and seats. With the advent of unleaded, some engines couldn't run on it, or they did but the valves didn't last long, and various methods were used to prevent the problem. Unleaded petrol has additives that partially replace the lead but don't work anything like as well. LPG has no additives at all, so the valves and seats will wear at a frightening rate, see http://www.go-lpg.co.uk/VSR.html. There is a product called Flashlube which was developed to allow engines that had valve seats too soft for unleaded to be run on it and it is often used on LPG conversions when fitted to engines with soft valve seats.

I very much doubt your engine has valve seat inserts at all, I suspect the seats are simply cut into the cast iron head. Upgrading the head would involve machining the existing seats out and inserting a hardened steel valve seat. Not cheap but it's a service offered to allow owners of the older BL A and B series (Proper Mini and MGB, etc) to run on unleaded. I'm sure the same companies would be able to do yours if you ask them nicely (and wave a sufficient quantity of folding under their noses).

_________________
'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: Sat May 19, 2012 8:56 am 
New member

Joined: Thu May 17, 2012 9:40 pm
Posts: 4
thankyou very much for your time Gilbert. i will have a look to confirm whats going on inside the engine..and ask a few questions usa side. running at low MPG is killing my pocket and the truck last year we completed over 5000miles so it will in the end pay for its self..im in it for the long hall, with visiting germany,belguim,luxumbourg ect last year...with only my spanners as backup!...


Top
 Profile  
Reply with quote  
PostPosted: Sat May 19, 2012 9:29 am 
Advanced Member

Joined: Wed Apr 09, 2008 9:00 am
Posts: 7971
Images: 0
Location: Peterborough
For an LPG system you're going to be looking at an open loop, single point mixer system, so nothing complicated (or expensive) You can buy mixers to suit different carbs so getting one to fit straight into the top of your Weber shouldn't be too much of a problem. You may find you can buy virtually a full kit secondhand for not much money as long as you know it's a worker and not something that someone else is getting rid of because it's had it. I'm not far away from you either, if you are into American iron you might be interested in some of the stuff I have here at times.

_________________
'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: Mon May 21, 2012 7:58 pm 
New member

Joined: Thu May 17, 2012 9:40 pm
Posts: 4
Anyone used Tinley Tech..>?


Top
 Profile  
Reply with quote  
PostPosted: Mon May 21, 2012 8:05 pm 
Advanced Member

Joined: Wed Apr 09, 2008 9:00 am
Posts: 7971
Images: 0
Location: Peterborough
Probably 90% of the people on here........

Even some of the Pros!

_________________
'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  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 3 guests


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:  
cron
Powered by phpBB® Forum Software © phpBB Group