LPG conversion Effect?

[mitsumi]

seen this in Facebook from a mirage group.

i think what the post is saying by GAS is LPG. at 130,000 needs to change valves

[mitsumi]

pictures are not mine im just sharing for those or someone whos using LPG ��

[poorman1]

Could be CNG

[Daox]

I'm not too familiar with running on LPG, but I know you can get the same effect (burnt valves) by running lean on gasoline. I wonder if it just wasn't running a good air/fuel mixture?

[Fummins]

Wonder if they had the head ever modified to run propane. Propane will kill stock valves and seats. Maybe not instantly but definitely prematurely.

I see more cons than pros of running propane. It's not sold at every gas station (but more so than natural gas), can be hard to find if on a road trip or need to fill late at night, you can't park in a garage or parkade, it doesn't really cost much less than gas, the fuel economy is typically slightly less that gas so might not save anything that way, need to modify engine to properly run propane, if you run out you need a bbq tank and a recovery hose or a tow to a station. But propane usually leaves far less deposits in the engine and oil stays pretty clean for a long time compared to gas.

But I'll stick to gas and diesel(& Flux capacitors)

[ismail_srp]

@mitsumi

Hi,
From Turkey. I use my car with lpg. Because it is very expensive gasoline prices in Turkey.
How long was used with lpg ? Dou you know ?

Also, can you sende me facebook group link ?

Thanks, have i nice day

[foama]

I've had a few cars with LPG (propane/butane) and sum up as follows.

LPG burns about 50°C hotter than petrol (USA: "gas"). Because of this, "soft" valve seats of the sort that can not take higher temperature will deteriorate. Deterioration means the valve seat material touching the valve deminishes, and consequently valve play increases. That in turn makes the valves hotter again which in turn burns up the valve itself. The final result is burnt up valve seats in the cylinder head, burnt or cracked valves, bad compression.

This almost only happens on cars of certain manufacturers, including most Japanese makes. This is the only reason why my car was not converted to LPG. Most of my other cars were converted to LPG.

On the other hand, some models of certain manufacturers will take LPG without any problems at all. Fiat Panda for example. In Korea, a large proportion of cars runs on LPG, and those cars are built to take it. My German Opel Astra had almost 270000km on it, converted to LPG from the beginning. It was finally junked because of rust, but the engine was just fine.

If any car is driven hard, the temperatures in the combustion chambers will be higher, and if that car was converted to LPG, it will have a comparatively high chance of failing valves.