It's A Gas...

You won't freeze anything in the liquid stage unless you're planning on taking the car into outer space, and everything prior to the vapouriser is liquid.
-160C is the freezing point, give or take the odd degree.

Orangebean said:

You won't freeze anything in the liquid stage unless you're planning on taking the car into outer space, and everything prior to the vapouriser is liquid.
-160C is the freezing point, give or take the odd degree.

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Lol, that's what I figured. It sits in the tank as liquid which is why there are two floats in there, one to show the contents and the other on the inlet valve to shut off when the tank is full.

I wonder if the light is just a "thing" because I didn't bin the old stored codes from the ham fisted clown who installed the last valve? I do know she starts and runs epic and the petrol usage is tiny considering the amount of stop starts I do.

Could be just a "thing". I don't know the electronics for your system, but it could be that, like a lot of ECU's, once a fault code is stored, you have to clear it off. Do you have the interface cable and software for your system?

Orangebean said:

Could be just a "thing". I don't know the electronics for your system, but it could be that, like a lot of ECU's, once a fault code is stored, you have to clear it off. Do you have the interface cable and software for your system?

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No idea where to even plug in! The light goes off after I shut off the engine and come back later (or sooner) and fire her up again all is well, but it's never gone into fault mode (flashing & beeping) since the service.

It's an AG system with STAKO tank and twin LPG ECU's (one for each bank).

Orangebean said:

You won't freeze anything in the liquid stage unless you're planning on taking the car into outer space, and everything prior to the vapouriser is liquid.
-160C is the freezing point, give or take the odd degree.

Click to expand...

I didn't mean literally freezing, I meant condensing.
What is the boiling point of lpg? Is there somewhere after the vaporiser where its getting cold enough to condense back to liquid?

Wazzajnr said:

I didn't mean literally freezing, I meant condensing.
What is the boiling point of lpg? Is there somewhere after the vaporiser where its getting cold enough to condense back to liquid?

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Unlikely, it goes from the Vap along a hose above the right bank exhaust manifold and round the back where it splits to each bank of gas injectors.

Like I say, it performs beautifully and I am having a real problem figuring when it switches as it is that smooth and doesn't seem to use a lot of LPG which is excellent

EDIT: apparently LPG boils at -42C

I think it depends on the propane/ butane mix
Propane -42C
Butane -2C
I can't remember what temp it comes out of vapouriser at though

I'm just thinking put of the box. I know, for example, that light aircraft can suffer carburettor icing at 15-20 degrees because of the cold air getting colder in the inlet manifold.
If the airflow is enough to make the manifold really cold, could the gas be just starting to condense in the injectors (or pipes on the way)
I'm no expert on lpg systems, it's just that as it coincides with heavy right foot I'm just wondering if the fuel isn't quite hot enough and condensing somewhere.
You say it was OK at - 3 but not when it was warmer. That ties up as well, the air will be more damp when it is warmer leading to more evaporative cooling.

Wazzajnr said:

I'm just thinking put of the box. I know, for example, that light aircraft can suffer carburettor icing at 15-20 degrees because of the cold air getting colder in the inlet manifold.
If the airflow is enough to make the manifold really cold, could the gas be just starting to condense in the injectors (or pipes on the way)
I'm no expert on lpg systems, it's just that as it coincides with heavy right foot I'm just wondering if the fuel isn't quite hot enough and condensing somewhere.
You say it was OK at - 3 but not when it was warmer. That ties up as well, the air will be more damp when it is warmer leading to more evaporative cooling.

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Evaporation / expansion causes cooling.

Grrrrrr said:

Evaporation / expansion causes cooling.

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My point exactly

Wazzajnr said:

I'm just thinking put of the box. I know, for example, that light aircraft can suffer carburettor icing at 15-20 degrees because of the cold air getting colder in the inlet manifold.
If the airflow is enough to make the manifold really cold, could the gas be just starting to condense in the injectors (or pipes on the way)
I'm no expert on lpg systems, it's just that as it coincides with heavy right foot I'm just wondering if the fuel isn't quite hot enough and condensing somewhere.
You say it was OK at - 3 but not when it was warmer. That ties up as well, the air will be more damp when it is warmer leading to more evaporative cooling.

Click to expand...

Lots of years back I had a VW Baja Bug, it was based on a '59 Beetle 36hp, the inlet manifold for the single carby was not connected to the exhaust crossover for heating because the bug had extractors fitted. After a long fast (for a VW), run with wide throttle a lot of the manifold tube used to ice up and even though it was fairly hot beneath the engine hatch, thick ice would form on the tube.
Something to do with the "Bernoulli effect" or so I recall from my tech days.
A cool bug.....ice cool!

My 100E Ford Prefect used to ice up its carburettor in the winter in Kent back in the early '60's.

My Honda Fireblade would also ice up in cold temperatures, those carbs didn't like the cold.

Just to let you know George has behaved impeccably on LPG so far! Starts on the button, runs beautifully and the change over is imperceptible

I have noticed upon foot down 20mph sort of speed, she aint as powerful on LPG as on petrol, but it's a tiny little loss and the savings far outweigh the losses.

It's been pretty damn cold up here last couple of weeks, but no issues...even when I took m'laddo up the hill into the snow & ice and gave her the beans, going sideways and foot down wheel spinning malarkey round the roundabout all on LPG. You could say it was a gas