The LPG liquid injection system injects Liquefied Petroleum Gas (‘LPG’) into the engine inlet manifold in the same manner as liquid petrol injection. The liquid LPG is injected sequentially into the inlet manifold, each injector aimed at the back of the inlet valve in the manner of the best petrol injection systems.
Because of the “volumetric effect” where the liquid turns to gas in the inlet manifold, thereby “freezing” the incoming air so densifying the fuel charge, the system gives a performance that is truly superior and is used in LPG racing cars that outperform their petrol counterparts on tracks around Europe.
The volumetric effect gives an appreciable increase in power output, torque and distance travelled per litre of LPG consumed. There is also a substantial decrease in emissions compared to other LPG systems, petrol or diesel.
The above amounts to a significant increase in driver satisfaction, giving extra savings at the fuel pump over gas injection LPG systems and petrol.
LPG reduces harmful emissions. Latest tests show that on urban roads on average a diesel vehicle emits the same fine particles as 120 LPG vehicles and the same NOx as 20 LPG vehicles.* In preference to diesel and petrol systems, governments worldwide are legislating to reward industry and consumers for adapting cleaner fuel sources by way of exemptions from levies (UK), personal taxation credits (France), direct subsidies for conversion costs (most of Europe), discounted vehicle registration and most importantly, lower duties/excise/tariffs at the pump.
Australia has a large, growing surplus of LPG, but imports less environmentally friendly petrol and diesel. LPG is a byproduct of natural gas production or the refining of crude oil.
*Autogas News—September 2004.
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