Justin, Jkordzi,

Finally I can return a favour on this board.

The early LPG-kits used a method to vapourise the LPG before it entered the engine. Vapourised LPG is difficult to control, so the system was not perfect. The LPG-air-mix was produced outside the engine, which meant separate controls, powerloss, possible backfiring and a puzzled lambda-probe.

My car runs on a Liquid Propane Injection-system from Vialle (www.vialle.nl). Yes, it uses a separate bank of injectors. And the LPG is liquid because it is kept at a certain pressure. A pump in the tank produces this pressure. This system has some advantages:
- The LPG is easier to control (right doses);
- The surrounding (air-filter, driving wind,...) has less influence on the system;
- It uses the standard electronics, so the ECU that controls the gasoline-injectors and mixture also controls the LPG-injectors and mixture. An extra computer corrects the timing for LPG-parameters (pressure, battery power, etc.). This extra computer also provides the automatic or manual switch between both fuels, and let you know how much LPG you have left in the tank (four leds);
- There's almost no explosive fuel-mixture in the intake system, so the problem of backfiring is minimalyzed;
- There's almost no powerloss.

Over here, the kit has to be installed by a registered mechanic. It's not a DIY-job.

I have no expertise with compressed natural gas, but Vialle seems to be active in that field as well.

I'm going to take some pictures soon, and put them on this board.

Uturn. 1992 965 LPi 285.000km.