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[feeutfo]

...and transfer pipe ordered from andyc today.

[feeutfo]

Although I did wonder about an air lock in the vap. As Kev surmised a few weeks ago on a visit. But we didn't know about the coolent variation then.

[symes]

Hi been following your thread-my Vap has pipe from bridge(back of engine)going to it and other pipe to back of HBV
is that wrong? its always been like that no problems as i have noticed-do I need to alter?

[feeutfo]

Sounds correct to me.

[Kevin Wood]

Something odd is going on with your vapuoriser anyway, it was cooling off way too much on a long run at full running temperature IMHO.

I don't suppose you looked at the vapour pressure and vapouriser temperature when it was playing up on gas?

By way of balance, my vapouriser temperature sensor is knackered, so it's currently wired with a resistor to read 98 degrees C all of the time. It switches over to LPG at > 30 seconds since engine start when RPM > 2000. At the end of my road, in other words. I've been wondering if this would cause a problem in colder weather yet this morning, -2 Deg. C and I didn't notice it switch over.

As long as the vapouriser doesn't freeze up it will still work. Maybe not at full power but for normal driving. A good circulation of water at a few degrees above zero will provide enough heat to compensate for the LPG boiling off although you'll get a lot of heavy ends until the temperature gets up well enough. Propane boils at -40 C after all!

Mine also had a knackered thermostat for a while (gauge read about 75-80 unless in traffic) and the LPG setup worked fine.

I think there's a problem with the vapouriser or the plumbing to it, TBH.

[TheBoy]

I've got a thermometer somewhere, which would show if rad is heating early (open stat)

[Kevin Wood]

Oh, and my thermostat showed the same symptoms during warm up. Heated up to 85, dropped like a stone to the bottom of the gauge. Repeated this a couple of times then sat at 75-80.

It didn't heat the top hose until normal temperature, but was clearly sticking.

[symes]

Sounds correct to me.

Cheers mate Hope you get ya car sorted mate 

[Kevin Wood]

IIRC, Gixer's coolant temperature was looking OK on the live data when we were scratching our heads. High 90's when "giving it some" IIRC. Vapouriser was down to 50 at one point.

[feeutfo]

Just to note. The car was never cold during Kevs examination. The symptoms never occurred then.

A remap improved things generally, and the car runs lovely on gas... Once warm.

[Kevin Wood]

Just to note. The car was never cold during Kevs examination. The symptoms never occurred then.

A remap improved things, and the car runs lovely on gas... Once warm.

Yep, agreed.. we pondered that a differential of more than 40 degrees between vapouriser and coolant wouldn't be good if it occurred at a lower coolant temperature.

[feeutfo]

Just to note. The car was never cold during Kevs examination. The symptoms never occurred then.

A remap improved things, and the car runs lovely on gas... Once warm.

Yep, agreed.. we pondered that a differential of more than 40 degrees between vapouriser and coolant wouldn't be good if it occurred at a lower coolant temperature.

Indeed. I have pondered insulating the vap pipes on occasions prior to these issues.

But shouldn't be an issue, if all is well, as you said before I believe.

[Andy H]

Is the vapouriser piped in series with the heater matrix?

Is it possible that the heater matrix might be partially blocked and in need of a flush?

[feeutfo]

Is the vapouriser piped in series with the heater matrix?

Is it possible that the heater matrix might be partially blocked and in need of a flush?

No. It's plumbed in before the hbv.

So the  pipe that goes from bridge to hbv, no goes from bridge to vapourisor to hbv, which then goes on to the bulkhead as normal.

[Andy H]

Is the vapouriser piped in series with the heater matrix?

Is it possible that the heater matrix might be partially blocked and in need of a flush?

No. It's plumbed in before the hbv.

So the  pipe that goes from bridge to hbv, no goes from bridge to vapourisor to hbv, which then goes on to the bulkhead as normal.

So... when you have heat on in the cabin the water flows through the vapouriser first then HBV and through the bulkhead to the heater matrix.

If low flow was causing the vapouriser to discharge ice cold coolant I would expect the heater to blow cold air as a consequence.

The thermostat looks like it is the prime suspect