Using LPG with a diesel engine has always been considered impossible. The only option was to add an ignition system to the engine to ignite the LPG, thus making it unable to run on Diesel.

Now there are a few specialist companies developing systems that combine LPG and Diesel into a Dual-Fuel system. This allows the engine to be run on Diesel alone or a Diesel/LPG mixture. The proportion of LPG used can be varied to either give maximum efficiency or additional power.

Obviously the cost savings for this kind of Dual Fuel set up are not as great as a Petrol/LPG system because you always have to run with a proportion of Diesel - which is taxed much higher - but the more LPG you can put into the mixture the less tax you will be paying. Obviously there are some limitations; a Diesel engine is not designed to run on LPG and if you start to add too much to the mix you will upset the running of the engine and possibly damage it.

On the other hand the LPG actually makes the engine more efficient by burning a higher proportion of diesel than it would normally do, greatly reducing emmissions.

Below we detail two such systems currently available. The IWEMA system is still under development but we actually got to drive a pick-up that had been converted by Arun Autogas in West Sussex with an American built system and the results were amazing.

	Arun Autogas Vauxhall pick-Up
	IWEMA systems

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