Lpg

[eunosben]

Hey all. I'm contemplating buying a legnum and was wondering how many of you have converted yours to run on lpg.
If so is it worth it and what are the benefits/issues?
Thanks in advance.

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[elnevio]

Have a word with @adaxo

[Davezj]

And @fassi

Adam adaxo is converting a legnum vr4 as we speek.

[fassi1]

Many things been said already on the club
http://www.clubvr4.com/forum/showthr...&highlight=lpg
http://www.clubvr4.com/forum/showthr...&highlight=lpg
http://www.clubvr4.com/forum/showthr...&highlight=lpg
In my opinion there are only benefits, no issues as long as the job is done properly
so good installer and right kit for VR4 are essential.

[adaxo]

Thanks for mentions, as been said above vr4 can be successfully converted and run on lpg as long as right parts been used and set-up via AFR measurement been done, what part of UK are you based?

just to add very recent quote by happy owner (not LPG biased as myself and fassi1 are) of good converted vr4

Great car to drive and own and 35GBP to fill up LPG which will I get about 190 - 200 miles.. (with the daily commute which is 50/50 urban and extra urban)

by Pezza


there is how my vr4 has been done

[-=white-zombie=-]

one thing to watch out for when running lpg is burning out valves, I don't know if this applies to our vr4s, but a friend of mine whos v6 commodore which he ran mostly on lpg over a period of a year or so finally burnt out his exhaust valves as their is no lubrication to the valves in the lpg like petrol gives, he should of been running upper cylinder lube, and has now had to spend a couple grand getting new valves head work etc..

[adaxo]

one thing to watch out for when running lpg is burning out valves, I don't know if this applies to our vr4s, but a friend of mine whos v6 commodore which he ran mostly on lpg over a period of a year or finally burnt out his exhaust valves as their is no lubrication in the lpg like petrol gives, he should of been running upper cylinder lube, and has now had to spend a couple grand getting new valves head work etc..

Im sorry but have to disagree with it,

you say

finally burnt out his exhaust valves as their is no lubrication in the lpg like petrol gives

how come anything can lubricate exhaust (post combustion) valves?? btw petrol hasn't got lubrication properties, working more like thinners, ie wash out oil from cylinder while engine run cold/rich.

but a friend of mine whos v6 commodore which he ran mostly on lpg over a period of a year

on what AFR's on idle/part load/WOT??

This is one of myths around LPG converted cars that they burn out valves, yes of course they do, if someone just fit lpg and run car without even bother to check fuel trims, not mentions afr's, then (in 99%) car will run to lean (somehow in most cases run lean instead of rich) by doing this exhaust gases temps increase above limits and engine start melting/burning valves ect, so yes run engine on lpg can damage your valves IF is not fit/set properly, exact the same like anything else.

[-=white-zombie=-]

umm I think youll find petrol and diesel have a lubricating properites and lpg doesn't...

here's a quote from Wikipedia LPG
http://en.wikipedia.org/wiki/Liquefied_petroleum_gas

Not all automobile engines are suitable for use with LPG as a fuel. LPG provides less upper cylinder lubrication than petrol or diesel, so LPG-fueled engines are more prone to valve wear if they are not suitably modified

anyway the vr4 might handle the lpg just fine if tuned correctly as you say, im just saying what happened to my mates car, it was an ex police car that was a duel fuel setup, and it had taken years to finally root the valves but it was a low km had done about 160,000kms and he had mosstly run it on lpg for about the last 8months or so and all the trouble began or caught up...

[fassi1]

The easiest way is to blame lpg not installer (lpg tuner).
I suggest to run the engine with AFR 15-16 at high boost (load) on petrol for lets say 1year or longer
if it survives and lets see what happens.

[Subaru ETA]

umm I think youll find petrol and diesel have a lubricating properites and lpg doesn't...

here's a quote from Wikipedia LPG
http://en.wikipedia.org/wiki/Liquefied_petroleum_gas

Not all automobile engines are suitable for use with LPG as a fuel. LPG provides less upper cylinder lubrication than petrol or diesel, so LPG-fueled engines are more prone to valve wear if they are not suitably modified

anyway the vr4 might handle the lpg just fine if tuned correctly as you say, im just saying what happened to my mates car, it was an ex police car that was a duel fuel setup, and it had taken years to finally root the valves but it was a low km had done about 160,000kms and he had mosstly run it on lpg for about the last 8months or so and all the trouble began or caught up...

Out of interest, was the commodore factory fitted with the due fuel set up (I assume it was). Was it running the old Buick 3.8L, or the holden 3.6L alloytec?

As a side, petrol has no lubricating properties (it it does it is F' all). That is why putting petrol into a diesel is so bad

[-=white-zombie=-]

I think the commy is a vt with the ecotec buick motor, it was factory fitted dual fuel... he has now got hardened valves fitted and an upper cylinder lubricator fitted so wont have the problem again, but who knows why it wasn't sorted from the start being a ex cop car...

[fassi1]

Every time I see in my garage lubricator fitted on lpg converted car, it goes straight in the rubbish been.,
what it does is F' all.
Most of the factory lpg kits are cheap to keep the costs low and badly tuned so lubricant and hardened valves haven't resolved the problem,
the engine is simply running too lean and soon or later cylinder head will be fecked again,
and again lpg will be to blame.

[paulg23]

Done 120,000 Km on LPG so far. No issues that I know of. Fitted it all myself. Have a wideband with dashboard display.

As far as I know petrol used to have lead added to it as a valve lubricant.

[jahooli]

I had it done 2 years ago (ish), still pay less than 70p per litre, 65 at the moment. Had the system fail twice, both time it was fuses. I have a brc system.
if you need any info give me a pm.

[eunosben]

Sorry for the late reply totally forgot about this thread. I'm in North Derbyshire. Still looking and saving for the car at the moment but I think an conversion wiol be the way to go.

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[fassi1]

Sorry for the late reply totally forgot about this thread. I'm in North Derbyshire. Still looking and saving for the car at the moment but I think an conversion wiol be the way to go.

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You wont regret it.
I've just done 180 miles for £35 so can't complain

[ageorge1964]

wot kinda money for conversion?

[fassi1]

wot kinda money for conversion?

I'm lpg installer so did it myself.

[BigAlex]

I have had lpg installed in my gallant sport for 7 years which is 90000 miles. Never any problems cuts down on carbon bulid up engine oil is cleaner when you change it. plus the money saved is unreal. I get the equivilant to 50+ mpg now where would you get that on a v6 anywhere

[exevoowner]

i want my legnum on lpg