DGI: why liquid state LPG injection is better

© gazeo.comThis Audi RS6's V10, 660 PS engine has no problem running on LPG with the DGI LCC system

DGI – one for all
Unlike similar products already available in the market, DGI's liquid state autogas injection systems are versatile – a conversion kit can be used for any applicable engine, without the need for developing separate software versions for each engine code out there. That's true for both the DGI LM, which applies non-vapourised autogas into the channels of the intake manifold of the engine, and the DGI LCC, which doses LPG straight into the combustion chambers, using for that purpose the engine's original petrol injectors. In the latter case, a converted engine runs on LPG 100% of the time, with no petrol interjections necessary to clean and cool the injector tips (the job is done directly by autogas).

Liquid state autogas injection systems are also more convenient to fit and maintain (no incorporation into the cooling system and no leakages of coolant), but also easier to operate – LPG pressure is regulated simply by changing the fuel pump efficiency.

© gazeo.comFinding reducers efficient enough to supply a 660 PS engine with vapourised LPG would be a challenge, but direct liquid state LPG injection eliminates the problem altogether

Importantly, liquid state LPG injection systems help lower the temperature of the air-fuel mixture supplied to the engine (5^th generation systems) and the temperature inside the combustion chambers (6^th generation systems). This means that not only is engine performance not compromised after conversion, but it may actually be boosted in certain speed ranges. Lower temperatures also serve to protect exhaust valves from overheating (LPG typically burns at higher temperature than petrol). Further still, engines converted with liquid state LPG injection systems meet stricter emission standards more easily than those using vapour state systems.

It is due to all the above that DGI focuses on liquid state autogas injection systems. In the company's view, they are the future in the long run, although – due to present popularity of MPI engines (equipped with multipoint port fuel injection) – DGI will not abandon developing 4^th generation (sequential vapour state LPG injection) systems until direct injection ultimately prevails in the market.