Source: The Australian, Wednesday August 11, 2004
Last week in the Australian I read a short article about a developments in the use of LPG that will make it much more efficient. Instead of the LPG being fed into the air intake before the throttle body, it will be fed to injectors in much the same way as the typical injector setup for petrol.However this system still converts LPG from liquid to gas before injecting it into the intake.The Australian LPG Association is testing third-generation LPG systems that use sequential injection, similar to the electronic fuel injection used on petrol engines. This offers greater efficiency and more accurate fuel metering, maximising the fuel consumption and pollution advantage of LPG.
This system has been called Liquid Phase Injection.But Boral Australia is testing an injection system that squirts the fuel into the manifold in liquid form.This system obviously does away with the converter that converts the liquid LPG from the tank into the gas state. The conversion of any liquid to gas results in the absorbtion of heat. Therefore the result would be lower engine temperatures than a typical LPG setup.Where most LPG conversions are down on power compared to petrol engines, motors using liquid phase injection systems generate up to 10 percent more power on LPG than on petrol. Fuel consumption also improves.I would expect that such a system, if it is implemented soon, could result in a resurgence in the number of LPG vehicles being bought or conversions taking place.The cooling effect of the liquid fuel turning to gas in the manifold also helps engine reliability and life.However you're still going to have the issue of the gas tank.Third-generation and liquid phase injection LPG systems are expected on the market as factory fitted or add-on systems within two years.
I don't know whether it would make any difference or not, but the fact that Ford has a dedicated gas engine may mean that it would be a prime candidate for the new system.