One of the problems with early experiments was the max torque moves up the rev range which increases stress (as a square iirc) on componants dramatically reducing engine life.

Perfect....more torque. Im not intrested in stress of the engine......I just want more power/torque When the engine goes bang it'll have had to much and I'll turn it back a bit for the next engine. It'll only inject gas at full throttle/max boost....the whole point is more power/torque. Nothing to do with mpg.:)
 
Perfect....more torque. Im not intrested in stress of the engine......I just want more power/torque When the engine goes bang it'll have had to much and I'll turn it back a bit for the next engine. It'll only inject gas at full throttle/max boost....the whole point is more power/torque. Nothing to do with mpg.:)

Think you are having a laugh aren't you. I detect a bit of a dreamer here. :D:D:D
 
At the very most it might be illegal on the road......but its sure is not impossiable or unsafe. It does work and has worked for years.

The first one I saw was 20 years ago fitted to an A reg RRC that was fitted with a transit DI. Ran LPG all the time for extra power.

OK carry on. :D
 
Perfect....more torque. Im not intrested in stress of the engine......I just want more power/torque When the engine goes bang it'll have had to much and I'll turn it back a bit for the next engine. It'll only inject gas at full throttle/max boost....the whole point is more power/torque. Nothing to do with mpg.:)

Torque is increased but as I said it moves up the revs which does produce big problems in short order unless carefully (and expensively) controlled.

Needs a ticket from a UKLPG approved installer (they don't need to have installed it but inspect it for safety) to be legal.

Seems a bit daft to resign an engine to destruction for torque imo. Better to fit an engine with higher torque in the first place
 
Think you are having a laugh aren't you. I detect a bit of a dreamer here. :D:D:D

<--- its in the pic...its an offroad toy used once a month. 300tdis are almost free....somettimes the are free. The engine fitted just know cost -£150, yes thats minus £150, want to buy some disco parts so I can make even more money from the rotten disco it came out of :)

Ive been a mechanic for 35 years and grew up with diesel engines and tractors. SO have a lot more practicle knowledge than youd think. Somebody has to try this stuff so the copy/pasters have something to pick holes in :)
 
<--- its in the pic...its an offroad toy used once a month. 300tdis are almost free....somettimes the are free. The engine fitted just know cost -£150, yes thats minus £150, want to buy some disco parts so I can make even more money from the rotten disco it came out of :)

Ive been a mechanic for 35 years and grew up with diesel engines and tractors. SO have a lot more practicle knowledge than youd think. Somebody has to try this stuff so the copy/pasters have something to pick holes in :)

If you want to play, play it's all part of the rich tapestry of life. ;);)
 
but these things dont come cheap and savings are less than those possible with petrol/lpg which is the driving force behind conversion.
Savings! :confused: Bloody stuff costs a fortune! :eek: We get 47kg for our cooker, think they are about 60quid a pop! I actually pay a few quid more to get them form the closest place, cos I hate driving around with them in me motor.

Yes the diesel igniting ignites the LPG. I was answering the statement that ALL fossil fuels can be compression ignited. LPG can't be in a normal engine.
A somewhat sweeping statement. He seems to ignore the fact that theu need to be atomised and mixed in a nice proportion with air first. Doubt if a pile of coal dust is likely to ignite! :D
Perfect....more torque. Im not intrested in stress of the engine......I just want more power/torque When the engine goes bang it'll have had to much and I'll turn it back a bit for the next engine. It'll only inject gas at full throttle/max boost....the whole point is more power/torque. Nothing to do with mpg.:)
If that is your thing, you go right ahead! :) I cannot imagine that approach will appeal to the majority of users, tbh.

Same as lpg in a petrol then. Luck my Rangie has lpg fitted to it when it was a v8. :)
I wouldnt dream of letting lpg anywhere near my V8 either! o_O
 
Yeah I don't like driving around with them in me car either :/ like a bomb waiting to blow up when someone rear ends you.
 
An interesting post , there also seems to be a lot of urban myth and hearsay floating around. Some of the buses around here (deepest Somerset) run on LPG and have done for years, but these are a one way conversion, and LPG is then the only fuel they can use.

Where does the DVLA state that adding LPG to a diesel engine is illegal in the UK, chapter and verse please?

This aside, adding Propane to a Diesel engine adds extra power only because your adding extra fuel, it burns cleaner only because LPG is a cleaner burning fuel, there is no more myth or magic to it further than just that. Diesels do not have a throttle butterfly unlike a petrol engine and so run in effect full throttle all the time and the fuel is the only thing varied to change power output, more fuel = more power and more RPM's. You may as well just turn the diesel pump up and add more fuel that way.

What I'd be more concerned about is fuel burn times as I would expect that Diesel burns a lot faster than the relatively slow burning LPG, this may lead to overheating issues with prolonged use. The slow burn of LPG is why when converting a petrol engine to LPG you have to advance the timing by quite a few degrees to get full power and to avoid overheating.

The much more clever approach for more power and a cleaner burn on Diesel is water methanol injection, this works in two stages:
1. Methanol improves the burn efficiency of Diesel, plus your adding extra fuel to the combustion
2. Water cools the incoming air making it more dense, therefore upping the compression ratio, it also cools the resulting explosion resulting in less NOx and CO production, these gases are only produced when burning a fuel quickly (part of the reason that slow burning LPG is so clean as a car fuel).

Water methanol is easy to get ready mixed, it's called concentrated screen wash, look for the screen wash with a flammable sticker.

This is proven technology and is even used in the aviation industry on jet and turboprop engines.
 
An interesting post , there also seems to be a lot of urban myth and hearsay floating around. Some of the buses around here (deepest Somerset) run on LPG and have done for years, but these are a one way conversion, and LPG is then the only fuel they can use.

Where does the DVLA state that adding LPG to a diesel engine is illegal in the UK, chapter and verse please?

This aside, adding Propane to a Diesel engine adds extra power only because your adding extra fuel, it burns cleaner only because LPG is a cleaner burning fuel, there is no more myth or magic to it further than just that. Diesels do not have a throttle butterfly unlike a petrol engine and so run in effect full throttle all the time and the fuel is the only thing varied to change power output, more fuel = more power and more RPM's. You may as well just turn the diesel pump up and add more fuel that way.

What I'd be more concerned about is fuel burn times as I would expect that Diesel burns a lot faster than the relatively slow burning LPG, this may lead to overheating issues with prolonged use. The slow burn of LPG is why when converting a petrol engine to LPG you have to advance the timing by quite a few degrees to get full power and to avoid overheating.

The much more clever approach for more power and a cleaner burn on Diesel is water methanol injection, this works in two stages:
1. Methanol improves the burn efficiency of Diesel, plus your adding extra fuel to the combustion
2. Water cools the incoming air making it more dense, therefore upping the compression ratio, it also cools the resulting explosion resulting in less NOx and CO production, these gases are only produced when burning a fuel quickly (part of the reason that slow burning LPG is so clean as a car fuel).

Water methanol is easy to get ready mixed, it's called concentrated screen wash, look for the screen wash with a flammable sticker.

This is proven technology and is even used in the aviation industry on jet and turboprop engines.

This is not an urban myth. YOU CANNOT RUN DIESELS ON ONLY LPG. You can add it to the diesel for sure, but a diesel will NOT run off pure LPG, it needs diesel to ignite it. LPG is NOT compression ignitable it's octane rating is far to high.
 
Savings! :confused: Bloody stuff costs a fortune! :eek: We get 47kg for our cooker, think they are about 60quid a pop! I actually pay a few quid more to get them form the closest place, cos I hate driving around with them in me motor.
When you buy it at an LPG station it's far cheaper, ~60p a litre, orange bottle are an expensive way to get Propane. Also a 3.5mm carbon-steel gas tank is a lot safer than a 1.5mm mild steel or plastic petrol tank that everyone seems to accept. Petrol is also faster buring!


A somewhat sweeping statement. He seems to ignore the fact that theu need to be atomised and mixed in a nice proportion with air first. Doubt if a pile of coal dust is likely to ignite! :D
Coal dust is very explosive, as are many other dust types including custard powder and milk whitener,


I wouldnt dream of letting lpg anywhere near my V8 either! o_O
Why not, there are lots of people creating myths about LPG, truth is I've run it in my V8 as the ONLY fuel for 15 years without issue. It's also standard for many fork lifts and they clock up thousands of hours without a problem.
 
This is not an urban myth. YOU CANNOT RUN DIESELS ON ONLY LPG. You can add it to the diesel for sure, but a diesel will NOT run off pure LPG, it needs diesel to ignite it. LPG is NOT compression ignitable it's octane rating is far to high.

Where did I say you can run a standard Diesel on pure LPG alone?
 
A lot of interesting information here. To be honest the more I looked into it there more its not really worth doing. Best results I could find from someone who has done it was 25bhp and 35ft/lb increase, which isnt fantastic considering the amount of work and cost involved let alone the legal side - I assumed it would be like nitrous, illegal on road legal on private land. Either way its an interesting topic I'd like to learn more about!

Some of the kits I saw where astronomically expensive! One was $2500!

My preliminary idea of the set up would be small 500g Coleman propane tank inside a housing mounted somewhere with a 12v solenoid in the ignition live right at the front of the tank then a second 12v solenoid linked up to a switch that would have its own master switch. With the pressure adjusted to deliver propane when the boost hits around 17psi. Looking at it more as a theoretical exercise than a practical one now!
 
Where did I say you can run a standard Diesel on pure LPG alone?

Here unless they are petrol engined buses. "An interesting post , there also seems to be a lot of urban myth and hearsay floating around. Some of the buses around here (deepest Somerset) run on LPG and have done for years, but these are a one way conversion, and LPG is then the only fuel they can use". Or did i misinterpret that?

Read the last paragraph of this. http://www.drivelpg.co.uk/advice-and-information/faqs/
 
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Here unless they are petrol engined buses. "An interesting post , there also seems to be a lot of urban myth and hearsay floating around. Some of the buses around here (deepest Somerset) run on LPG and have done for years, but these are a one way conversion, and LPG is then the only fuel they can use". Or did i misinterpret that?
I stated in that sentence "but these are a one way conversion", you seem to have made an assumption this is still a compression ignition engine. Sorry for the confusion, when converting a Diesel to full time LPG, the injector is removed and a spark plug installed assuming that there is enough material available around the injector hole for a larger diameter spark plug. This is why I did say originally this is a one way conversion.
 
I stated in that sentence "but these are a one way conversion", you seem to have made an assumption this is still a compression ignition engine. Sorry for the confusion, when converting a Diesel to full time LPG, the injector is removed and a spark plug installed assuming that there is enough material available around the injector hole for a larger diameter spark plug. This is why I did say originally this is a one way conversion.

I would think the compression ratio would also have to be reduced considerably. ;)
 
Yeah I don't like driving around with them in me car either :/ like a bomb waiting to blow up when someone rear ends you.

Slightly irrational fear, but I dont like it. Seen a few boats where gas bottles have gone up, not pretty!
 
When you buy it at an LPG station it's far cheaper, ~60p a litre, orange bottle are an expensive way to get Propane. Also a 3.5mm carbon-steel gas tank is a lot safer than a 1.5mm mild steel or plastic petrol tank that everyone seems to accept. Petrol is also faster buring!

Coal dust is very explosive, as are many other dust types including custard powder and milk whitener,

Why not, there are lots of people creating myths about LPG, truth is I've run it in my V8 as the ONLY fuel for 15 years without issue. It's also standard for many fork lifts and they clock up thousands of hours without a problem.

As above, maybe an irrational fear. Quite apart from anything else, the bottles themselve would do damage in an impact, unless tied down.

I know coal dust is explosive, so is flour, but only when mixed in the air in roughly the right proportions. Not when it is in a compact mass.

My mate has run his Jeep six cylinder on LPG since new in 1999. I dont have a problem with it for petrol engines. But my Disco only does about 3k a year, mostly towing, and fuel is cheap now anyway, so doubt if I would bother with it myself.
 

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