Tell me about butain conversions.......

In my personal opinion, LPG conversions are okay, but really they work best on large cars which do high mileage. For a small car running locally I wouldn't bother at all. The reason for this is because most LPG conversions cost you a huge amount of luggage space which is taken up by the gas cylinder, and most of them tend to cost the engine some power, especially if it's set up to run dual-fuel (switchable petrol/LPG).

The cheapest type of conversion is the traditional carby-type mixer. These cause hard starting (long cranking time) on LPG and it's usually advisable to start the engine on petrol and switch to LPG. LPG is hard on engines because it doesn't offer any of the lubricating or cooling properties of liquid fuels, meaning that your valve guides will wear and your valves will run a lot hotter. LPG conversions tend to use at least 30% more fuel per km but the fuel is usually much cheaper so this compensates. However, in a small car which is probably already doing very good fuel economy, the savings will be miniscule. With only short local trips, it will take many years to break even on even the cheapest conversion. Even if you got the conversion for free, with a car like a Polo I wouldn't sacrifice the boot space and power for the minute savings in fuel costs.

I dunno about 30% more... But yeah, more fuel is used. But the fuel is substantially cheaper.

Carb conversions are less efficient than EFI but an injected conversion is more complex and will cost more to convert.

I ran my old Cadillac on LpG and no difference in performance on gas or petrol and I still beat the "factory" fuel economy figures when running on LPG. That was an EFI motor though

As said the margins are much more attractive on a large car but if you can convert it cheap enough I reckon it could be the win. You need to do your sums really

I have had lots of cars on LPG and they averaged 5% more fuel on LPG than petrol, thats both with mixers and injection, the smallest was 2.4l and the biggest was 7.2l I love the stuff.

For DIY conversions have a look a tinlytec web site they are the cheepest I have found

50-60% your having a laugh surely, even a 1.3 Mk2 fiesta I service only looses 20% that's on a curse word mixer plate under the carb and the system was fitted new so it's a very basic old, OLD setup with no timing advance when on gas, it'd be even less if he changed to a switchable ign modual.

some curse word been talked in this thread. ive lpg'g my 325 e30, cost me about £200using second hand stuff and cheap bouht bits and £120 of that was buying a new wide band lc-1 to help with setup and tuning, got a donut tank in the boot, still got plenty of boot space.

mines a open loop basic system, which returns about 20mpg, which is pretty much the same as it gets on petrol, power loss is minimal, noticeable but not massive. if its setup right youll be well happy and nearly half ur fuel costs.

Running a bottle from a forklift will work fine as they're just LPG but is naughty to do because the road duty isn't paid



Thats curse word, from experiance if its using any more than 15-20% extra the conversion is either spec'd wrong or incrediably badly set up.

I doubt that you would notice the power loss either to be honest.

Over a lot of years we've managed to get a carbied Rangie to do more mpg on LPG than on petrol with a lot of messing with ignition timing different plugs etc, thats running a basic open loop but well spec'd kit originally fitted back in 1988....

Oh if you are naughty and run off gas cylinders remember to turn them upside down as you want liquid not vapour.

Not that I'd condone avoiding being shafted for fuel duty or anything.

Forklift bottles have a liquid take off.....

or you could just invert a camping bottle and pump it into your tank on the car, either by hand pump or leccy pump they are on ebay,,, apparently
not that i condone it at all i just heard is all