Dual Fuel Cars.

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Mar 14, 2005
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Agreed David, The 26% saving is LPG against diesel of course the saving against petrol is even higher.

And having once had to replace a Cat on a petrol car I do not want to have that expense again in a hurry. So the clean burning LPG that keeps the Cats in good order is another saving.

My son also is having problems with his injectors on his diesel 306. Are they expensive or what!!!

As for TD5 Land Rover injectors - they are
 
Mar 14, 2005
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David,

Why start you response with total misinformation or a complete fib !!

Diesel engines are now of the equivalent or Better emission level than LPG - a clear a easy table for you to read is to see how many Diesel engine cars fit in Band A & B of the DVLA's emissions based vehicle excise tariffs.

The point I was making with regard to ECU is that in any converted vehicle where the manufacturer hasn't designed the ECU to take into account an "aftermarket conversion" is not good. As a good customer of a Bosch, Delphi, Lucas injection systems garage I Know of the examples of Mercedes E Classes with very expensive E prom replacements because the Taxi driver went LPG they've also seen lots of issues with Japanese Multi-point engines. I not knocking LPG because Clive's own example is a good example that everyone accepts as a conversion that goes well. But it's a simple good design.

But you either suggest everyone buys a Vauxhall BI -Fuel (read the honest John forum of how successful or not this car has been in service). One point is that British Gas runs a large Vauxhall fleet of Combo vans with a Bi-fuel option - They run diesel instead and they extract the stuff!! LOL LOL

The Other point that you rightly point is that if you buy an LPG car with a premium principally with a
 
Apr 1, 2006
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Hi david,

I tow a double wheelbase 1700KG van with a dual fuel vehicle- Diesel and then switch to the original fuel meant for diesel engines and introduced by Rudolf Diesel- Vegetable Oil! The advantages to my pocket are immense and to the planet immeasurable! www.dieselveg.com!
 
Jul 26, 2005
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As is sadly typical this thread has lost sight of the original questioners request and degenerated into irelavant sub isues. Answers from,in this case actual users of LPG, are overshadowed by contributers with unhelpful obscure agendas and no actual experience of the requested information which was; "Does anyone tow with a duel fuel car, iether factory system or after market"

Only one actual user reported slightly unfavourably and he admitted that he only drove the car for four months and didn't actually tow with it.

If you filter out the " I think I know something about this"

contributor from the " yes Ive tried this and it works or otherwise" type of reply then in this case Dave I think you will be able to make a choice.
 
Mar 14, 2005
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Certainly using old vegetable oil seems a heck of a good idea. One of my sons student friends used to put Tesco cooking oil in his old Rover 800 diesel. It went surprisingly well on it for a car with over 140k miles.

If it works for you Merve - go for it! I have seen the website and it looks good.

My main "beef" is that the "diesel heads" seem to forget that it is modern technology that enables a diesel engine to be cleaned up. A diesel engine of even five years ago is a truly smelly noisy dirty thing!

Modern diesels are cleaner because of technology whereas even an old 50's design classic like the Rover/Buick V8 runs cleaner than a petrol or diesel car without any gizmos at all.

Because as a fuel - LPG is inherently clean.

Hence far less "polluter pays" tax, such that LPG is half the price of petrol and about 60% cheaper than diesel.
 
Mar 14, 2005
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As is sadly typical this thread has lost sight of the original questioners request and degenerated into irelavant sub isues. Answers from,in this case actual users of LPG, are overshadowed by contributers with unhelpful obscure agendas and no actual experience of the requested information which was; "Does anyone tow with a duel fuel car, iether factory system or after market"

Only one actual user reported slightly unfavourably and he admitted that he only drove the car for four months and didn't actually tow with it.

If you filter out the " I think I know something about this"

contributor from the " yes Ive tried this and it works or otherwise" type of reply then in this case Dave I think you will be able to make a choice.
He always pops up when LPG is mentioned - talks a lot of twaddle the b*ggers off
 
Nov 6, 2005
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Burning ANY fuel creates CO2 which is the main greenhouse gas causing global warming.

Vegetable-based fuels like ethanol and vegetable oil are only acceptable to "greens" because they absorb CO2 when they're grown so are "carbon neutral".

LPG can be justified where there's a cost saving but don't kid yourself that it's any less harmful than petrol or diesel!
 
Apr 1, 2006
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Burning ANY fuel creates CO2 which is the main greenhouse gas causing global warming.

Vegetable-based fuels like ethanol and vegetable oil are only acceptable to "greens" because they absorb CO2 when they're grown so are "carbon neutral".

LPG can be justified where there's a cost saving but don't kid yourself that it's any less harmful than petrol or diesel!
Absolutely agree with everything you have said Roger. LPG produces massively more CO2 as compared to Veg Oil. LPG is ADDING to the CO2 whereas my fuel is just releasing it again. I'm happy with it anyway. Won't mention it again!
 
Mar 14, 2005
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Roger, Merve - LPG is a bi-product of oil production - it used to be burnt off as waste but now it is harnessed and used. Surely you can see that that is better than wasting a valuable resource.

As for it being as harmful as petrol or diesel - why then is it taxed at less than half of diesel and half of petrol because the DTI recognise that it is far greener than either.

Have a look at the DTI figs from their website:-

http://www.boostlpg.co.uk/driver_industry/why_LPG.htm
A short synopsis!

Environmental and social benefits

LPG is one of the cleanest vehicle fuels available, producing far less carbon dioxide than petrol and fewer particulates and nitrogen oxides than diesel. In environmental terms. Pan-European tests carried out on new vehicles in 2003 showed that for:

Global warming:

Use of LPG resulted in a 20%saving on CO2 over petrol and a 1.8% saving compared with diesel.

Air Quality:

On urban roads, on average, just one diesel vehicle emits the same fine particles as 120 LPG vehicles and the same NOX as 20 LPG vehicles.

LPG vehicles can help offset the considerable social costs of pollution damage to health and buildings.

You get a quieter ride with LPG; noise levels are 50% less than with diesel engines.

For more information, have a look at Environmental performance.

Economic benefits

You can save up to 40% off your fuel bill. Due to cuts in fuel duty, LPG retails for approximately half the price of petrol and diesel. LPG vehicles also qualify for cheaper road tax.

The Government supports LPG by reducing the level of fuel duty and by giving three years' advance notice in every Budget of any changes compared with petrol and diesel. This means that we know that the price at the pumps will continue at around half the price of petrol and diesel for at least this period.

LPG is better for your engine. Its simple chemical make-up means it's clean burning, and, as it is already in gaseous form when it enters the combustion cylinder, it burns more efficiently than petrol or diesel. Fewer deposits build up in your car engine, so it will run smoother and last longer.

Most cars having a petrol engine with spark ignition can be converted to LPG, but it is essential that you use a fully trained LPG specialist for the work. It costs around
 
Mar 14, 2005
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Roger, Merve - LPG is a bi-product of oil production - it used to be burnt off as waste but now it is harnessed and used. Surely you can see that that is better than wasting a valuable resource.

As for it being as harmful as petrol or diesel - why then is it taxed at less than half of diesel and half of petrol because the DTI recognise that it is far greener than either.

Have a look at the DTI figs from their website:-

http://www.boostlpg.co.uk/driver_industry/why_LPG.htm
A short synopsis!

Environmental and social benefits

LPG is one of the cleanest vehicle fuels available, producing far less carbon dioxide than petrol and fewer particulates and nitrogen oxides than diesel. In environmental terms. Pan-European tests carried out on new vehicles in 2003 showed that for:

Global warming:

Use of LPG resulted in a 20%saving on CO2 over petrol and a 1.8% saving compared with diesel.

Air Quality:

On urban roads, on average, just one diesel vehicle emits the same fine particles as 120 LPG vehicles and the same NOX as 20 LPG vehicles.

LPG vehicles can help offset the considerable social costs of pollution damage to health and buildings.

You get a quieter ride with LPG; noise levels are 50% less than with diesel engines.

For more information, have a look at Environmental performance.

Economic benefits

You can save up to 40% off your fuel bill. Due to cuts in fuel duty, LPG retails for approximately half the price of petrol and diesel. LPG vehicles also qualify for cheaper road tax.

The Government supports LPG by reducing the level of fuel duty and by giving three years' advance notice in every Budget of any changes compared with petrol and diesel. This means that we know that the price at the pumps will continue at around half the price of petrol and diesel for at least this period.

LPG is better for your engine. Its simple chemical make-up means it's clean burning, and, as it is already in gaseous form when it enters the combustion cylinder, it burns more efficiently than petrol or diesel. Fewer deposits build up in your car engine, so it will run smoother and last longer.

Most cars having a petrol engine with spark ignition can be converted to LPG, but it is essential that you use a fully trained LPG specialist for the work. It costs around
 
Nov 6, 2005
8,449
2,940
30,935
Roger, Merve - LPG is a bi-product of oil production - it used to be burnt off as waste but now it is harnessed and used. Surely you can see that that is better than wasting a valuable resource.

As for it being as harmful as petrol or diesel - why then is it taxed at less than half of diesel and half of petrol because the DTI recognise that it is far greener than either.

Have a look at the DTI figs from their website:-

http://www.boostlpg.co.uk/driver_industry/why_LPG.htm
A short synopsis!

Environmental and social benefits

LPG is one of the cleanest vehicle fuels available, producing far less carbon dioxide than petrol and fewer particulates and nitrogen oxides than diesel. In environmental terms. Pan-European tests carried out on new vehicles in 2003 showed that for:

Global warming:

Use of LPG resulted in a 20%saving on CO2 over petrol and a 1.8% saving compared with diesel.

Air Quality:

On urban roads, on average, just one diesel vehicle emits the same fine particles as 120 LPG vehicles and the same NOX as 20 LPG vehicles.

LPG vehicles can help offset the considerable social costs of pollution damage to health and buildings.

You get a quieter ride with LPG; noise levels are 50% less than with diesel engines.

For more information, have a look at Environmental performance.

Economic benefits

You can save up to 40% off your fuel bill. Due to cuts in fuel duty, LPG retails for approximately half the price of petrol and diesel. LPG vehicles also qualify for cheaper road tax.

The Government supports LPG by reducing the level of fuel duty and by giving three years' advance notice in every Budget of any changes compared with petrol and diesel. This means that we know that the price at the pumps will continue at around half the price of petrol and diesel for at least this period.

LPG is better for your engine. Its simple chemical make-up means it's clean burning, and, as it is already in gaseous form when it enters the combustion cylinder, it burns more efficiently than petrol or diesel. Fewer deposits build up in your car engine, so it will run smoother and last longer.

Most cars having a petrol engine with spark ignition can be converted to LPG, but it is essential that you use a fully trained LPG specialist for the work. It costs around
 
Jun 7, 2005
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Don't really want to get involved in this but I thought I should point out a couple of inaccuracies in Clive's postings.

Firstly I have extensive experience of LPG converted internal combustion engines, I am a trained engineer in, Power generation, hydraulics, transmissions etc (Christ I sound like cris now)

LPG is not a relatively new phenomena, we have been using this as a fuel in vehicles since the early 70's and currently operate about 600 such vehicles.

Wear in LPG engines is less than petrol, wrong, you give me 2 identical cylinder heads with the same mileage or running hours on and I will 100% of the time be able to distinguish between the due to the wear patterns. The LPG fuel head will be showing accelerated wear in the valve gear, in fact as I type this 2 of my guys, just outside my office, are in the process of changing the cylinder heads on an LPG converted GM4.3l V6. The vehicle in question has done the equivalent of 120 000 miles.

Carbon monoxide is present equally in petrol and LPG vehicles, this becomes a problem in certain environments. As it is odourless people can be subjected to dangerous levels of Carbon Monoxide without knowing it.

Clive, your suggested search on Google brings up mainly companies who have an interest in selling the concept (what do you expect then to say)

I have only added this to give balance since fundamentally I agree with most of what you say.
 
Jun 7, 2005
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Don't really want to get involved in this but I thought I should point out a couple of inaccuracies in Clive's postings.

Firstly I have extensive experience of LPG converted internal combustion engines, I am a trained engineer in, Power generation, hydraulics, transmissions etc (Christ I sound like cris now)

LPG is not a relatively new phenomena, we have been using this as a fuel in vehicles since the early 70's and currently operate about 600 such vehicles.

Wear in LPG engines is less than petrol, wrong, you give me 2 identical cylinder heads with the same mileage or running hours on and I will 100% of the time be able to distinguish between the due to the wear patterns. The LPG fuel head will be showing accelerated wear in the valve gear, in fact as I type this 2 of my guys, just outside my office, are in the process of changing the cylinder heads on an LPG converted GM4.3l V6. The vehicle in question has done the equivalent of 120 000 miles.

Carbon monoxide is present equally in petrol and LPG vehicles, this becomes a problem in certain environments. As it is odourless people can be subjected to dangerous levels of Carbon Monoxide without knowing it.

Clive, your suggested search on Google brings up mainly companies who have an interest in selling the concept (what do you expect then to say)

I have only added this to give balance since fundamentally I agree with most of what you say.
Sorry

My point on the Carbon Monoxide comment was that unlike petrol fuelled vehicles there is very little "nose" to the exhaust on an LPG vehicle, yet the same levels of CO are present covertly
 
Mar 14, 2005
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I find it hard to believe you can blame wear in the valves on LPG - more likley to be a problem with oil flow to thye gallery I would have thought

Yes there is a suppossed lubrication benefit from petrol but this is more than outweiged by the advantage of clean oil and less oil/fuel residue "goo" that builds up.

Hardened "unleaded" valves and valve seats have not sufferred unduly by being run on LPG. Only thing I have come accross is that some engines do run hotter due to the cooling effect of the air/petrol emulsion as opposed to the dry LPG.

As for my choice of website - I DELIBERATELY chose the DTI one as that has no commercial bias at all - QUITE THE OPPOSITE IN FACT - seeing as they are the ones that GIVE MONEY AWAY TO THOSE THAT WANT TO CONVERT VEHICLES!

I never said LPG was perfect - I am sure there will be some particular problems. But overall LPG is cheaper, cleaner, easy to use and does not require expensive catalytic converters on the vehicle as the emmissions produced are less than a petrol car fitted with a cat!
 
Jun 7, 2005
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I find it hard to believe you can blame wear in the valves on LPG - more likley to be a problem with oil flow to thye gallery I would have thought

Yes there is a suppossed lubrication benefit from petrol but this is more than outweiged by the advantage of clean oil and less oil/fuel residue "goo" that builds up.

Hardened "unleaded" valves and valve seats have not sufferred unduly by being run on LPG. Only thing I have come accross is that some engines do run hotter due to the cooling effect of the air/petrol emulsion as opposed to the dry LPG.

As for my choice of website - I DELIBERATELY chose the DTI one as that has no commercial bias at all - QUITE THE OPPOSITE IN FACT - seeing as they are the ones that GIVE MONEY AWAY TO THOSE THAT WANT TO CONVERT VEHICLES!

I never said LPG was perfect - I am sure there will be some particular problems. But overall LPG is cheaper, cleaner, easy to use and does not require expensive catalytic converters on the vehicle as the emmissions produced are less than a petrol car fitted with a cat!
Now then Clive no need to shout, your suggested Google search does not bring up the DTI web site as far as I can see, but I am not looking through the 188000 sites returned so I will take your word for it that that is the site to which you refer
 
Mar 14, 2005
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Graham - I print in capitals to emphasise as this site does not support italics or underlining - very frustrating!

As for the website see my post on this thread of yesterday - repeated here for your ease:-

CliveV

18 May 2006 09:55 AM For those that want a good review of Dual Fuel cars have a look at the Department Of Trade & Industry (DTI) site :-

http://www.boostlpg.co.uk/driver_industry/Switch to LPG magazine.pdf
The DTI and the LPG association came together to produce this site.

There are several good sources of info on the www if you just Google "LPG Engine Wear".

Have a look - make your own mind up.
 
Mar 14, 2005
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There have been postings on this topic regarding the evidence which is available in various government research papers about the pros and cons of LPG, petrol, diesel, etc. Can we believe these papers - look what was said and proved wrong regarding weapons of mass destruction in Iraq. I think the individual will have as much sense in this matter as the so called experts of the government. I personally would be very sceptical of any government propogander these days.
 
Jun 7, 2005
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Graham - I print in capitals to emphasise as this site does not support italics or underlining - very frustrating!

As for the website see my post on this thread of yesterday - repeated here for your ease:-

CliveV

18 May 2006 09:55 AM For those that want a good review of Dual Fuel cars have a look at the Department Of Trade & Industry (DTI) site :-

http://www.boostlpg.co.uk/driver_industry/Switch to LPG magazine.pdf
The DTI and the LPG association came together to produce this site.

There are several good sources of info on the www if you just Google "LPG Engine Wear".

Have a look - make your own mind up.
Clive

You quote the "Boostlpg" website

My point exactly, a government organisation (load of idiots) and an association which is trying to feather its own nest, hardly independant.I think you are being a tad naive
 
Mar 14, 2005
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Energy in an internal combustion engine is aquired through oxidising carbon.

Regardless of the carbon based fuel used, you will get an oxegen-carbon molocule as a result.

The amount of Carbon-dioxide/carbon-monoxide produced is relative to the amount of heat generated.

If you want to produce less greenhouse gas, get a smaller engine/car that requires less energy.
 
Aug 28, 2005
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Clive,

I think your use of the DTI is fantastic for your advice as it goes against many DoT research documents. Still I think as most contributors will be amazed at your love/ hate relationship of the Government. Colin is spot on and consistent and also has spotted the real hidden agenda of the government.

By the way I can only ****** off when my Job is done. I'm absolutely neutral on the subject in terms of objectivity because I have no financial or other interest in any one fuel source but am professional qualified in the area and I hate to see people make mistakes in purchasing a vehicle based the outdated and biased opinion (not of yourself necessarily) bit of some website.

MH
 
Apr 1, 2006
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Certainly using old vegetable oil seems a heck of a good idea. One of my sons student friends used to put Tesco cooking oil in his old Rover 800 diesel. It went surprisingly well on it for a car with over 140k miles.

If it works for you Merve - go for it! I have seen the website and it looks good.

My main "beef" is that the "diesel heads" seem to forget that it is modern technology that enables a diesel engine to be cleaned up. A diesel engine of even five years ago is a truly smelly noisy dirty thing!

Modern diesels are cleaner because of technology whereas even an old 50's design classic like the Rover/Buick V8 runs cleaner than a petrol or diesel car without any gizmos at all.

Because as a fuel - LPG is inherently clean.

Hence far less "polluter pays" tax, such that LPG is half the price of petrol and about 60% cheaper than diesel.
Hi Clive,

Thanks for your comments. I'll tell you this, after 2 and a half years of driving on reclaimed veg oil, I can't understand why it hasn't caught on more than it has!! I can't tell you whatyou what it's like driving around for 27.1p per litre (if you pay the full duty). OK it has its downside ie collecting,settling, filtering etc but I have saved serious money. If I kept stum over my activities I could tow my van to Edinburgh- or even John'o'Groats from the Midlands for about
 
Nov 1, 2005
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Hi Clive. It is the case that LPG is harder on the valve seats than petrol, in the same way that unleaded fuel is harder than leaded. Because most modern engines have very hard valve seats erosion doesn't show until about 200k mls or so. I suppose you could put a lead substitute in your petrol and drive 30 or so miles a week on petrol to combat this. Although the engine oil suffers less contamination from carbon an LPG engine must still be frequently serviced, mainly the ignition components since LPG is harder to ignite than petrol and any deficiency in the ignition system will prevent the engine from running on LPG. To get back to David's original question, I tow a 1900kilo Hobby with my LPG Grand Cherokee (aftermarket system) and can honestly say there no difference on the road between petrol and LPG. My fuel consumption is roughly the same whether towing or solo at about 15-17MPG. Miles per pound this equates to about 280-300 miles for
 
Jul 26, 2005
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Wow! somebody's got back to the question agin - wonderful.

Yes it's a fact that LPG can cause damage to valve seats - if you have an older enine with non hardend valves and seats there is a product called Flashlube which acts rather like the old Redex (for those old enough to remember the one shot cans on petrol station forecourts) they also make an underbonnet injector. No need if you have a modern engine though unless you want ultimate peace of mind. 200000 miles would seem to be pretty good to me anyway - that's an awful lot of towing!
 

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