525 Touring LPG installation pics

[shogun]

Engine: M50B25
LPG unit produced by Prins
http://public.fh-wolfenbuettel.de/~kirchhof/Gaseinbau/Motor_von_links.jpg
http://public.fh-wolfenbuettel.de/~kirchhof/Gaseinbau/Motor_von_rechts.jpg
http://public.fh-wolfenbuettel.de/~kirchhof/Gaseinbau/Motor_von_oben.jpg
Kehin Injektor under inlet manifold
http://public.fh-wolfenbuettel.de/~kirchhof/Gaseinbau/Kehin.jpg
LPG STAKO tank
http://public.fh-wolfenbuettel.de/~kirchhof/Gaseinbau/Tank_Kofferraum.jpg
ACME fuel lid
http://public.fh-wolfenbuettel.de/~kirchhof/Gaseinbau/ACME_Anschluss.jpg
selection switch fuel-LPG at phone console
http://public.fh-wolfenbuettel.de/~kirchhof/Gaseinbau/Umschalter.jpg
Price including installation EURO 2.500
LPG tank has 40 Ltr. capacity, but will changed to 55 Liter.

[Badkrma]

I would like to know what kind of milage it gets and cost differance for fuels.

[granit_silber]

I would like to know what kind of milage it gets and cost differance for fuels.
I wouldn't mind having him make my engine bay look that clean! :D
-ashley

[Lennyz525i]

How does it affect performance?

[Interceptor]

How does it affect performance?
Since this is a crappy LPG installation (only one injector in the intake manifold instead of one for every cylinder) one might expect up to 10-15% less HP and 10-15% less MPG. The only real benefit is the price of liquified petroleum gas as opposed to gasoline. Here, gasoline is 2.5x more expensive than LPG.

[SRR2]

Interesting point. Injecting the gas in the vicinity of the throttle body will necessarily displace combustion air. Injecting gasoline at the valve doesn't displace anything I imagine since it evaporates on the way into the cylinder. What's the stoichiometric ratio of LNG fuel to air? That will probably give a pretty good estimate of the reduction in available power, due solely to air displacement. Seems to me that to do this right, the gas would have to be injected just like gasoline -- under high pressure, right in front of the valves.

[bighc2000]

I wonder how it would compare to the 518g Touring p0rduced by BMW? The g ran on both gas and cng.

[shogun]

That is quite popular in Europe because of the big difference in prices. Even 750 V12 are converted to LPG.
Here is some info
http://www.autogas-forum.de/links/links-e.htm
http://www.lpg-vehicles.co.uk/lpg_news/alternative_fuels_forum.htm

[Interceptor]

That is quite popular in Europe because of the big difference in prices. Even 750 V12 are converted to LPG.
Here is some info
http://www.autogas-forum.de/links/links-e.htm
http://www.lpg-vehicles.co.uk/lpg_news/alternative_fuels_forum.htm
The bigger the engine, higher the probability that one of the owners will convert it to LPG as the car gets older (and cheaper).

[jplacson]

is the 518g engine a direct bolt-on for all E34s?

I wonder how difficult a conversion would be to use this engine...

[Morgenster]

The very latest system and also the most expensive will use one injector per cylinder and inject the LPG in liquid state. This way the LPG can be metered more accurately and the gas expands inside the cylinder creating a slightly higher compression (which is no problem since the octane number on LPG is higher also).
Downside is pricing and relative availability.

[filip00]

518g is too weak engine, i'd dare to say it's crap. converting an m50 to a LPG engine is the best alternative, mine did over 40k miles now without a single problem...

[BigKriss]

what system did you use, do you have a link for it?


518g is too weak engine, i'd dare to say it's crap. converting an m50 to a LPG engine is the best alternative, mine did over 40k miles now without a single problem...

[Ferret]

The 518, while apparently 'slow' by everyone elses standards, is not to be sniffed at! Having ridden in one recently I was quite impressed by the different torque curve, it didnt seem underpowered at all.

Despite it's 'weedy' engine, combine it with a decent diff ratio and it's still as quick as 50% of the cars on the road in the UK... as ~50% are fairly economic 1600cc or less 4 bangers.

It's only 10hp less than the M20 520i and 20hp short of the M50 520i - it actually has 4Nm more torque than the M20 and 22Nm less than the M50.

The M20 520i is actually going to feel slightly quicker as it has an insane 4.44 diff, but the 518 and the 520 M50 share the same diff, so I expect that they will feel almost the same to drive...

Untill you fill up and realise how many miles extra you've done with 2 less cylenders.