Induction Systems

This type of system is the simplest and by far the most common conversion carried out. Suitable for all types of vehicle, the system introduces gas to the engine in a vapour form through the inlet manifold. Older, carburettor vehicles and early, injection models use the LPG reducer to control the inlet of fuel into the engine. Later vehicles use a slightly more sophisticated management system that reads the oxygen sensor in the exhaust. This then controls fuel levels using a stepper motor, which gives the most efficient fuelling at all times.

Sequential Gas Injection

Gas injection systems are becoming more popular as the costs have reduced and set-up of the systems is now considerably easier. The sequential system injects LPG as a vapour into each cylinder, very close to the inlet valves.
The system offers slightly improved economy and performance and eliminates the possibility of spit-back.
Injection is more suitable for vehicles with very complex engine management systems or those fitted with plastic inlet manifolds.

Diesel LPG Conversions

Diesel engines can be converted to run partly on LPG, partly on diesel. This method uses the combustion of the diesel to ignite the LPG. The benefits include large increases in power and reduction in emissions, particularly the black smoke often associated with diesels.
Typically a ratio of 30% LPG to 70% diesel is possible. No adjustments are required to the diesel injection system and fuel savings come from the fact that throttle openings are lower due to the greatly increased power, which basically means you do not have to press the accelerator as hard to get the same performance.

Fuel savings upwards of 30% are possible with the increased power levels seen as a major benefit to users.