Mirage LPG conversion (Thailand)

[Daox]

One of our members posted the site I found this on. I suggest using google translate if you want to read any of it. But, it looks like a pretty cool setup.

http://www.lovemirage.com/221/mirage-lpg-ac-stag-isa2/

[foama]

I've had many LPG cars before, they run well and exceptionally clean if the conversion and the adjustment is done right.
LPG (propane/butane mix) costs less than petrol, about on third to one half of the petrol (gasoline) price, depending on taxation.

In the top photo you see two of the three injectors (red), and they are not directly connected to the intake manifold, but via a short hose. That is exactly the way it should not be done, because the control system becomes too slow and inaccurate.

The down side of LPG is that the gas mixture burns about 50°C hotter than petrol, and the valves and their seats have to be capable of taking the extra heat. Doesn't sound like being much hotter, but many European Fords, and a few other models have serious problems from valves and/or valve seats burning away after LPG conversion. Most French, Italian Korean and Japanese cars have no such problems at all. If you do a simple search, you could find blacklists of models that will not withstand LPG. I would not want such an anachronistically built car anyway, regardless of LPG conversion or not.

[RodeRoNL]

I asked the Mitsubishi importer in the Netherlands about LPG. The reply was that not a single Mitsubishi is suited for LPG. When LPG is used and the engine suffers damage related to LPG use, there is no warranty. The problem is that the use of LPG limits the durability of the valves, valve seats and cylinder heads. As a second opinion, I asked the dealer about specifically the Space Star (Mirage). He also stated that the Space Star (Mirage) was not suited for LPG use.

So, it seems best to close this thread?

[Daox]

I thought it was a bit odd that the gas orifices were so far upstream of the throttle body, but I don't know much of anything about LPG conversions. Thanks for the schooling Foama!

[foama]

The gas injectors should be all equal distance away from the intake valves. That distance should be as close as possible to the intake valves, and of course after the throttle. The output of the injectors should lead directly into the manifold, no hoses or such should be inbetween. It will work with hoses inbetween, but the richness of the mixture will not be regulated as well, amongst other problems. Sorry Daox, I didn't want to start schooling, but these are some of the often disregarded little things that become so important for the owner, because they make the difference of the car running well or totally not.

[hank]

Not sure if anyone has posted this yet, but I've stumbled on this a while back and forgot about it until now!

https://www.youtube.com/watch?v=58VqrHudFWg
https://www.youtube.com/watch?v=_bpj7rtftZg

I've no idea what they are saying, but it pretty much follows the entire procedure.

[foama]

Not sure if anyone has posted this yet, but I've stumbled on this a while back and forgot about it until now!

https://www.youtube.com/watch?v=58VqrHudFWg
https://www.youtube.com/watch?v=_bpj7rtftZg

I've no idea what they are saying, but it pretty much follows the entire procedure.

That first link shows the injectors being mounted equidistant on the intake manifold directly. This is exactly how it should be done. The rest of the job is certainly done well, but I would not mount the filling inlet (where you fill it up) under the car. I would think most of the parts are from BRC and tomassetti, but its hard to tell.
Foama

[Daox]

Is anyone here considering an LPG conversion?

[Daox]

I added this to the Mods & DIY list.

[foama]

I was told at a conversion-shop: "The three-cylinder European Colt are supposed to be blacklisted for LPG conversion, the cause being "valve/seat excessive wear just as with all Honda and all Toyota since 2003".

Question:
Does somebody know for certain if the Mirage engines are on one of the gas-conversion blacklists? On which list in particular?