Hi s-klasse
S-klasse wrote:
Does the company that makes the CNG conversion generally have their own package of warrants for the whole conversion including the whole engine to replace the factory warrants?
In general all companies offer their own package of warrants.
Sometimes only their stuff is included, sometimes the whole engine.
This is a very important point in the convertion contract.
S-klasse wrote:
Or do you loose all warrants for the car if you do a conversion, if the car is new or almost new?
Yes, you loose all factory warrants
S-klasse wrote:
What about the emissions from a CNG converted engine, are they the same, better or worse compared to when the engine was running on petrol?
The emissions on CNG are a litte bit better than on petrol.
The CO2 emission is about 20 per cent less.
But in the actual tax discussions here in Germany they calculate with the "dirty" fuel
S-klasse wrote:
When it is time for MOT inspection (is it every 2;nd year in Germany??) are there extra checks of the CNG system and are there usually any problems?
Yes, an extra check of the CNG system is requiered every 2 years.
The CNG tank needs a special check every 10 years.
I haven´t heared of any problems so far.
S-klasse wrote:
Can any petrol engine be converted or are some types more difficult, e.g. turbo's, carburators' or old mechanical fuel injection systems (I've got a MB 280 SE - W108 - from 1971 as a summer/oldtimer car)
oh boy - you own a great car ! I love these old MBs !
I think it should be no problem to convert this car.
Only the new FSIs cause some problems.
I heared of some who should run, but I never saw a converted one.
S-klasse wrote:
What are your experiences with a CNG converted car sofar, would you still recommend it?
Well, this is not easy to answer.
I still believe in driving with CNG. But I don´t know if I would convert my next car. At the moment I lean to buy an OEM CNG car.
Don´t get me wrong, this has nothing to do with the technical stuff.
Sometimes I would use the whole trunk, but there is the big tank.
I used to love the view to the engine compartment, but there are some things they don´t belong there. I know this may sound silly, but I think an OEM looks more "complete".
S-klasse wrote:
Unfortunately it is still very expensive and difficult to do a CNG conversion in Sweden. Apparently it is not only the cost for conversion but you also need to get a complete new type approval with regard to the engine emissions that is more expensive than the conversion, unless you are so lucky that someone else has already got an approved conversion of your dream car with exactly the same engine typ...
You need the same over here. The good thing is, that a professional company would do all this stuff for you.
You only have to pay for it
S-klasse wrote:
Since the current supply of factory CNG cars is either very limited or very expensive (a Mercedes E 200 NGT would be nice...
) a CNG converted S-class, A8 or 7-series from the late nineties would have been a good alternative at a small-car budget.
Regards
/Mercedes driver
Compared with a LPG convertion, a CNG convertion is much more expensive.
Some gas-provider support the convertion - or a new CNG car - so that the cost is almost equal.
Cheers
Eric
