LPG - Liquid Injection 3

[jbond]

Are there any kits out there that inject LPG in liquid form so that when it changes state to the gas, it removes the latent heat from the charge air (turbo application) and has the effect of cooling the intake and with high octane rating as a bonus? The injectors in such a system would be similar to typical petrol injectors (ie not a venturi carby system)

Also, do any of these kits allow you to remove the petrol fuel tank and petrol injectors?

 

[turbocohen]

Pat, I have seen it vary from one week to the next at the same station..

 

[drwebb]

Do you mean LPG injectors have problems with coking? I would predict propane should have about the third-lowest deposit-forming tendency of any HC fuel (behind or about equal to methane and ethane). Is motor grade LPG odorized? That's the only place Sulfur could come from.

 

[turbocohen]

The most substantial cause of cng or lpg injecotr failure is by far from deposits. Field experience proves that lp has the highest deposit forming tendency bar none. I can back that up with photos, data, field experience and user experience. There is much talk of fuel quality re lpg as motorfuel but the talking heads put more energy into their golf game and not the fuel. LPG is not inherently bad fuel but just like gasoline, even if it is of high quality there needs to be some additive present that cleans up deposits that are inevitably going to form and to keep injectors and valves clean.. Even if the fuel is not the direct cause it has a role with interaction.. oil gumming up parts is a real issue. Untreated or even poorly treated lp leaves heavy residue that precision parts with a few microns of clearance just cannot deal with. For precision fuel delivery the durable technology exists but finding dependable sources of motor grade lp is like a needle in a hay stack.
And to answer your question, motor grade lp sure is odorized but organic sulphur levels are way too high most of the time by orders of magnitude. Many times our own testing revealed +500ppm.. +100 is the lowest if the odorant is low. Needs to drop under 20ppm for catalyst and o2 sensor life aside from injector life. Sulphur deposits are very problematic and tough to remove from injector internals even with good chemicals that are safe for non metalic components.

I am not sure but a few trials of additives are supposedly underway at clean fuel usa and elsewhere here in the usa and ENI agip may also have a trial in your home country but I cannot verify the efficacy of their products real world deposit control.

Ciao, James "Turbo" Cohen

 

[Spataru]

Your help is requested to learn the operating pressure range for a pump pushing LP Gas in a liquid injection system. Thank you.

 

[patprimmer]

spataru

You may get more help and your question is much more likely to not disappear if you start your own thread.

Red fag this post yourself (It looks a lot better that way than if you leave it and someone else does it).

Post here that you have red flagged this post with a direction to the new thread so no one else posts here.

Cut and paste any answers here to the new thread.

It would not be LP gas in a liquid injection system, it would be liquid propane with maybe some butane and/or ethane

Regards
Pat
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