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Liquid Injection on SS V8

ttfn2tt

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had liquid fitted to v6 in frankston, very positive ,be careful who does the install, they used the JTG unit . lost the spare wheel cavity but what the??
 

exquisit

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poweredbycng: very nice with your descriptions!

just wondering, i have read that some systems, even the hsv/orbital system, transfer back to petrol up in the rev range for lubrication, etc
is this necessary or is it a marketing gimmic?
also what about supposed problems such as burnt valves etc due to the extra heat generated by gas, are these also affecting ls1's?
 

Silver Streak

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Hi I have done 16000 Kms since installing the JTG Liquid injection, without any problems Gee that is not bad in about 4 months ,the car always starts on petrol , and after about 30 to 40 seconds it primes the petrol from the injectors replaceing the peterol with Liquid Gas, there is a pump in the gas tank , it pumps the liguid gas up to the injectors and as the petrol is primed out the liquid gas takes over seamlessly from peterol on that injector and so on till all the injectors have liquid gas , I am saving about $1000 every 10000 ks. depending on the price of gas, the valves are already hardened for unleaded and the other fuel cant think at the moment the one from sugar cane VEs are set up for that , it is on the inside of you petrol flap.
 

exquisit

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your talkin bout ethanol silver streak?

so ve's already have hardened valves, but do the older ls motors suffer failures because they are run on gas on a standard motor?
 

poweredbycng

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just wondering, i have read that some systems, even the hsv/orbital system, transfer back to petrol up in the rev range for lubrication, etc
is this necessary or is it a marketing gimmic?

The main reason why the Orbital system switches to petrol operation at high engine speeds (NOT high loads) is because of company policy. Orbital do not wish for their system to produce more power on LPG than petrol because they wish to keep everything within manufacturers' tolerances. Higher power outputs may compromise the longevity of various components in a car which would not be good for a major supplier of OEM LPG systems. FWIW, there are several variables involved with the petrol switchover on the Orbital system with one of these variables being engine temperature.

also what about supposed problems such as burnt valves etc due to the extra heat generated by gas, are these also affecting ls1's?

There is not issue with premature valve seat recession with Liquid LPG Injection. LPG is injected into the engine in liquid form, SUPER-COOLING the intake charge as it expands because being combusted in the cylinders. As a result, your car will drive like it is winter all year round and hence the sizable power increase over petrol. Regarding valve seat recession, engines built to run unleaded petrol have hardened valve seats anyway. The lead in leaded petrol was for the benefit of the valve seats back in the day.
 

exquisit

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poweredbycng: mate... you are a champion
=)
you pretty much answered all my worries in one post
thanks for that!

just out of interest then, there is no benefit of switching back to petrol is there?
and petrol would only be used to start the motor and only used after if you wanted to use it correct?
 

poweredbycng

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Hi I have done 16000 Kms since installing the JTG Liquid injection, without any problems Gee that is not bad in about 4 months ,the car always starts on petrol , and after about 30 to 40 seconds it primes the petrol from the injectors replaceing the peterol with Liquid Gas, there is a pump in the gas tank , it pumps the liguid gas up to the injectors and as the petrol is primed out the liquid gas takes over seamlessly from peterol on that injector and so on till all the injectors have liquid gas , I am saving about $1000 every 10000 ks. depending on the price of gas, the valves are already hardened for unleaded and the other fuel cant think at the moment the one from sugar cane VEs are set up for that , it is on the inside of you petrol flap.

When you start a car fitted with Liquid Injection and you have the fuel gauge switched to LPG, the fuel pump activates to pump any LPG in the engine bay back into the tank. This is because the fuel in the engine bay is exposed to outside temperatures, potentially causing vapour bubbles to form due to expansion. Since the Liquid LPG injectors can't meter gas vapour, the system needs to be PURGED (i.e. bled, NOT primed) of all vapour 'pockets' before it can function properly. This process typically takes a few seconds but most systems are configured to have a petrol run-in process of around 45-60 seconds. During this time, the status LED on your fuel gauge will blink to let you know that you're running on petrol. Once the system has been purged, the status LED will glow continuously to let you know that the fuel switchover has occurred. The pre-injection LPG pressure is controlled by both the pump at the outlet of the tank as well as a pressure regulator in the engine bay, pretty much the same way as a petrol system is controlled.
 

poweredbycng

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just out of interest then, there is no benefit of switching back to petrol is there?
and petrol would only be used to start the motor and only used after if you wanted to use it correct?

No benefit whatsoever of switching to petrol at high engine speeds, and yes, with the JTG system, you will only use petrol when YOU want it to (aside from the run-in process after each start).
 

exquisit

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poweredbycng: once again thanks for your insight
much appreciated!
 

poweredbycng

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No worries! :)

Just for reference, we have three LPG cars - one running gas injection and two running liquid injection. Plenty of experience here!
 
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