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LPG Basics


All Autogas equipment is chosen for its effectiveness, reliability and value for money. Most equipment comes from Italy - a country that has been at the forefront of LPG conversion for the last 30 years. Several major brands of equipment are stocked, ensuring a wide range of equipment for all types of vehicles.

Kits come with everything that is needed for the conversion, including a comprehensive fitting guide. Each LPG kit is supplied with a means to set up the system after the installation. This ranges from simple technical information, small handheld testers, to computer software on the most advanced systems.

The 2 main decisions about the kit are the type of front-end system and the size and shape of the tank(s). Front-end systems are described below and you can click here for tank details.

Sequential Gas Injection
Induction Systems
Diesel LPG Conversions

Sequential Gas Injection

Multipoint Sequential Gas Injection Systems (SGIS) are the most appropriate type of LPG conversion for vehicles built after 1999. Any vehicle with a plastic inlet manifold should have this type of conversion. Kit costs have reduced and set-up of the systems is now considerably easier. The sequential system injects LPG as a vapour for each cylinder, very close to the inlet valves. The gas ECU works with the petrol ECU so that, when switched to gas, the engine is run as it was designed to be run (except for the change of fuel).
The system offers slightly improved economy and performance (when compared with induction systems) and eliminates the possibility of spit-back. Click here for more details of kit components.

Sequential Injection Kit
1=Gas ECU, 2=Gas injectors, 3=Filter/shut-off valve, 4=Vaporiser, 5=Pressure sensor, 6=Pressure balance, 7=Changeover switch, 8=Manifold nozzle, 9=Water temperature sensor, 10=Gas temperature sensor, 11=Multivalve, 12=Tank, 13=Filler, 14=Vapour filter

Induction Systems

This type of system is the simplest type of LPG conversion carried out. Suitable for all types of vehicle built before 1999 (except those with a plastic inlet manifold), the system introduces gas to the engine in vapour form through the inlet manifold. When switched to gas, the way the engine runs is controlled by the LPG system.

Open-Loop Induction Systems
Older, carburettor vehicles and early, injection models that do not have a catalytic convertor can be converted to an open-loop system where the LPG reducer and power valve are used to control the inlet of fuel into the engine. This is the simplest and cheapest solution. However, with the addition of a lambda probe in the exhaust, the system can be upgraded to closed-loop operation, with all of the benefits described below.

Closed-Loop Induction Systems
Later petrol-injected vehicles have catalytic converters and require LPG systems that use a slightly more sophisticated management system that reads the oxygen sensor in the exhaust. This then controls fuelling using a stepper motor, to give the most efficient fuelling at all times, resulting in better fuel economy and better throttle response. Click here for more details of kit components.

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 up to 30% are possible with the increased power levels seen as a major benefit to users.

For more information on the conversion of diesel engines click here.
Click here for more details of kit components.



Within the context of this site, the terms LPG, GPL, Liquefied Petroleum Gas, Propane and Autogas are synonymous.



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