tee
Part of things
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I suppose what I'm asking is are there any adverse effects. Was looking for something economical, settled on a merc cl500 :? So thinking of sticking a tank in it but don't want to effect performance etc. it shouldn't take me long to recoup my costs.
Anyone on here fit LPG, or suggestions if you know anyone that does...
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T
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It depends a lot on what kind of LPG conversion you get and how it's set up. Generally, most cars lose a bit of power on LPG, but it's worth it to save on running costs. If you need full power, you can always switch back to petrol.
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Hi Tee,
As waveman1500 says you lose a little bit of power but nothing too substantial. You will need a better set of plugs more suited to LPG and a really decent set of plug leads is a must other than that you should be good to go. We used to run a few Merc Sprinters on LPG and no problems as a general rule.
Cheers.
Russ.
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tubbs
Part of things
Posts: 59
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Yes thats what i do for a living. Is it the same ? Well now technically, its quite a big question. Normal petrol is 95 ron, the expensive stuff 98. Lpg 115-120 ron but it has a lower calorific value. And it depends how you introduce the LPG into the engine.
If you have a carb, you introduce it with a mixer just over the top of the carb. It has a venturi and as vac increases the gas flow does as well. Put quite simply. However you are restricting the the air flow a bit. So slightly down on power.
Modern injection systems however are a completely different matter. They intercept the petrol injector pulse and inject the gas in the same way as petrol. No restriction to the air flow. So they pull like a petrol car exactly to the letter.
Turbo cars the waste gate is dictated by the knock sensor, LPG doesn't knock.
Guess what i run ?
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,220
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Sorry, it's a Merc CL 500, think you can drop a couple of horses without a problem ;D!
And next time you go looking for an economical car, take an responsible adult with you ;D
You made me laugh out loud this morning, because this is something I can see myself doing, luckily (or unluckily, perhaps) the girlfiend keeps me on a tight leash......and this thread needs pictures.
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A modern multipoint sequential injection LPG system is indistinguishable from petrol. Except when you pay for the fuel. I wouldn't run a daily driver on anything else.
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I noticed valve some valve seat wear on mine but I don't think its an issue that should worry anyone. More worryingly is I can't get LPG for much less than 80p anymore.
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1970 Porsche 911E
2002 Porsche Boxster S
2002 Peugeot Partner 1.9sdi
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I noticed valve some valve seat wear on mine but I don't think its an issue that should worry anyone. More worryingly is I can't get LPG for much less than 80p anymore. Still paying about 70ppl round here on account, certain vehicles (that are succetible to valve problems anyway) need a flashlube kit to stop valve seat wear when doing the conversion, a reputible company will tell you this. Tanks are certified for 10 years and in theory need re-testing after this time.....the oldest one of ours was out of test in 1997 its fitted with a sullage valve rather than the 80% cut off...but thats been inside the vehicle, I would want to give an underslung one a real good looking at first at that age. |
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A modern multipoint sequential injection LPG system is indistinguishable from petrol. Except when you pay for the fuel. I wouldn't run a daily driver on anything else. What he said!  Though they cost a bit more than a venturi-mixer system... And a word of advice: don't have it installed by the cheapest shop... Go somewhere reputable! |
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I wonder if it could be used on an ITB setup, it runs batch fire, as most cars do I guess, as not that many run sequential and a cam sensor.
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`state
Yorkshire and The Humber
Posts: 1,215
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Do the new sequential kits still need the car to start up on petrol? If not you`d see a good gain by upping the cr and setting the timing to optimum for the lpg rather than petrol.
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Look at all the plastic people who live without a care.Try to sit with me around my table,but never bring a chair.
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The ones I have had automatically start on petrol then switch. On three of them, you could force it to start on gas. On my current one either you can't or I don't know how to.
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were running a k palted volvo 940 2.0 turbo auto on lpg at the moment,not a great deal noticeable between the fuel and lpg performance wise,can get it for 74ppl here in exeter.
can get about 300 miles from 40 quids worth if you drive it sensibly.
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1984 Subaru GLF Hatch
1983 Skoda 120LE Super estelle
1977 Subaru DL Wagon
1978 Datsun 120Y Coupe
1995 Skoda favorit estate
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tubbs
Part of things
Posts: 59
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Full group / half group injection systems are not uncommon. The best is all the Italian AEB ecu. Zavoli, bigas, king, emer etc. they do it very well. BRC don't even try. A lot of the polish systems have the capability. But it's all pretty old hat really. We are all on board diagnostic's monitoring fuel trims on sequential injection systems.
Being a v8 it's not the cheapest conversion. But I can quote you if you are really serious.
Don't worry about valve seat recession. It's not a problem with Mercs.
You need them to start on petrol first thing to get over the cold start injection enrichment. But once they have got over it they start on gas all day.
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Last Edit: Feb 3, 2013 20:31:43 GMT by tubbs
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devilishdesigner
Australia
Gleaner of possibilities
Posts: 2,978
Member is Online
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This is the thread I need to be reading! I am looking to do a straight gas injected system on my 1976 XJ6. It is currently twin SU but my reputable local LPG place says they can do an injected conversion to straight gas, so am very interested to know more about experience in the technology and older motors.
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Remade In Australia
thereimaginarium.com.au
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I wouldn't both with a modern system on your Jag if you are going straight gas just bung Gas Research carbies on it, or OHG if you can find them.
From experiance I really don't see that you will gain that much fitting an injection kit to a carbed engine unless you are going to do a serious amount of messing with tuning and start fitting a megajolt with TPS and lambda sensors and want to be able to play to get the absolute optimum settings all the time. Does it have to be injection to qualify for the grant they were doing in Victoria?
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devilishdesigner
Australia
Gleaner of possibilities
Posts: 2,978
Member is Online
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Doesn't need to be, just looking at efficiency and durability, want to get a lot of km out of this car as I love driving it, so looking at the best long term solution.
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Remade In Australia
thereimaginarium.com.au
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tee
Part of things
Posts: 703
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thanks guys, interesting reading. I'm still trying to work out how long I'd need to make back the money, but I'm planning on keepin the car for a while and even if I sell it'll be worth more with the lpg - tubbs can you get me a price on the conversion pls
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T
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all good now, but with the greedy government taking there chunk, now at 74 p a litre here, how long untill its the same price as petrol!
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 cars: orion 1600 i ghia mk2 orion 2.2 vtec ghia mk1 |
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I have LPG on my V8 Discovery althou performance has had a little dropped a small bit, its more the drop in MPG, on petrol it was doing 18-20MPG, on gas it drops to 9-13MPG averages about 11MPG most of the time.
Am paying the same for gas as I used to pay for petrol when I had a classic Range Rover 12 years ago. Cant believe how the price has risen.
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Some days you just need to take a grinder to an inanimate object, just to make your day a tiny bit better!!
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Though they cost a bit more than a venturi-mixer system...
