Friday, Apr 29, 2005 at 22:26
I saw this the other night on the ABC's New Inventors program.
I have no idea if it is a better Autogas (Auto LPG) system for motor vehicles.
How it works.
The GTi Stealth Injection System is a multipoint sequential vapour system for gaseous fuel injection technology in cars. It works directly in conjunction with a car’s existing computer. It doesn't need a secondary computer to interpret and send the new gas system’s needs to the first computer.
This is achieved primarily through the use of a specially designed gas injector valve. Similar to the workings of fuel injector valves, Bill’s injector differs by including electronics within. This will ultimately enable the valve to open to a 4mm opening due to an increased use of amps. This gap is substantially larger than the fuel injector holes, which vary somewhere under 0.1mm openings on fuel injectors. It is essential for the right delivery of gas with air ratio.
Existing fuel injectors cannot be used with gas, not only because petrol is a liquid, but because the quantity of fuel allowed through those holes wouldn’t be enough for gas. More gas is required than fuel, due to the fact that gas is a vapor, not a liquid. This means that Bill’s gas injectors require larger openings. These fit into the timing of the existing computer’s pre-set fuel injection commands, whilst still allowing enough gas through. In fact, the GTi Stealth Injection System allows 300 times more gas than petrol through each injector in the same time.
Thus the name stealth as it's fooling the car’s computer into thinking that it is still using a petrol injection system. The actual timing of the injection does not need changing as the size of
the gap itself allows enough gas through, not the length of time of the opening. This enables the user to still directly tap into the car computer’s existing programming and elements as nothing else needs to be changed.
Other systems need open longer, gas stays in manifold, changes dynamics within engine. This also means that a second interpreter interface/computer is not required to talk to the first computer to tell it what the gas systems needs are. Those needs have not, according to the first computer, actually changed. Basically, the timing for the activation of the engine’s components, controlled by the computer, do not need to change.
Bill’s system also requires the use of a specially designed heat exchanger/ regulator. This works in conjunction with the gas injectors, as it fully vaporises the LPG from its stored liquid state, at the regulator. Existing regulators cannot start cold. They require dual fuel systems (incorporating the choice of either petrol or gas) to start on petrol, then convert to gas when the engine is warm enough to vaporise the LPG. In systems with no dual fuel, this is a problem. With Bill’s regulator however, the system can start from minus 10 degrees.
From the regulator, the vaporised gas travels to and through the fuel rail. It enters the gas injector (and is forced through its large hole) at the same position as it would have on petrol injector. It emerges into the inlet manifold where it is mixed with air. This mix then travels through the engine’s inlet valve, then into the cylinder, nicely mixed. There, the piston comes up, and the spark plug fires.
As usual the claimed results are as follows.
'This results in:
* Superior Engine Performance
* Longer Engine Life
* Reduced Exhaust Emissions
* OBD Compatibility
* Original Fuel System functionality
* Cost Effective Investment'
Cost is between $2000-$2300 AUD for most vehicles.
Gas Injection Technologies Pty Ltd website.
http://www.gas-injection.com/lpg-gas-injection-technologies.html
ABCs website.
http://www.abc.net.au/newinventors/txt/s1345083.htm#otherinfo1
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Follow Up By: gqpat - Sunday, May 01, 2005 at 21:12
Sunday, May 01, 2005 at 21:12
Hi Dennis ,Your gu patrol gas conversion should cost you arond 2200-2400 drive in drive out dyno tested as that is what they are down in
melbourne using an APA tank and IMPCO under bonnet system if you want a really top job and are in
melbourne for some reason ph Lakeside Automotive 0394605630 these guys are fantastic and will gladly answer any questions you have hope this helps
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