My LPG powered beetle.

[Dake]

https://www.amazon.com/Complete-Straight-Propane-C...&psc=1

I had this bookmarked . But thought it was to high.

[oprn]

It does seem a bit high all right but I am a out of touch with current prices.

That is an interesting evaporator!
_________________
Our cars get old, we get old but driving an old VW never gets old!

[oprn]

CNG ≠ LNG ≠ LPG acronyms that need clarifying.

CNG - critical natural gas. Methane under high pressure but lacking the full properties of a liquid. May be found at pressures up to 3500psi. This is the most common form found in vehicle conversions.

LNG - liquid natural gas. Methane under high pressure AND refrigerated to a liquid form. Must be kept in a cooled, insulated tank to stay in this state.

LPG - liquid propane gas. The common way to find this gas. It stays in a liquid form easily at moderate temperatures and pressures.

NGL - natural gas liquids. Liquids dropping out of the gas stream in the production of natural gas. May contain various blends of water, propane, butane, pentane, hexane, octane and heptane. Common name, natural gas condensate.

Natural gas has a vapour pressure of 3500 psi at 100*F.

I found this information in a search just to confirm what I wasn't 100% sure of. So as you see we need to confirm that it is actually methane we are discussing.

As far as what you are saying about reversion in a VW FI intake manifold, that is very interesting! I see no reason why either propane or natural gas would not work well in those plenums. There is no fear whatsoever of the gas dropping out and condensing in that manifold.

Your heater block for the liquid fuel is also quite interesting to me. I think it might work just fine for propane if it can deliver enough BTUs to do the job. With natural gas there would be no need for it at all.

I didn't realize such an animal existed! For diesel you say? Or are you proposing we invent one?
_________________
Our cars get old, we get old but driving an old VW never gets old!

[67rustavenger]

[oprn]

Ya I thought so too but I guess it depends on who posted it. The site I was on termed it critical because in that state it is a bit unpredictable. Not sure in what respect...

Natural gas was tried in our climate in the big cities in taxis and public transportation busses but was discontinued after about a 10 year run. The #1 problem is getting enough into a container to give you any range. The ranges are very similar to electric vehicles. It just did not catch the public fancy because of lack of fueling stations and the tanks are very heavy, of limited shape and capacity.

Due to a surplus of natural gas the Argentine government funded research and implementation of natural gas conversions for vehicles. They set up fuel station networks from one end of the country to the other. One of the locals told me when we were visiting that there was no place in that country that you could drive and not find a filling station. They also capped the price at 25% of gasoline prices. They are now the leading exporter of that technology in the world.
_________________
Our cars get old, we get old but driving an old VW never gets old!

[raygreenwood]

[oprn]

Propane was the big one here at one time but it is rare now. Natural gas does not exist on the road today, only on stationary industrial engines. Very common in the oil patch where the natural gas is virtually free and often burnt off in a flare stack as a useless by-product.
_________________
Our cars get old, we get old but driving an old VW never gets old!

[oprn]

I don't understand the need for gasoline for start up. Natural gas has no cold weather vices. We start cold Caterpillar gas compressor engines with it at -30 in the dead of winter. If the oil is not too stiff and the starter will turn it over it will start! No fuel enrichment needed like gasoline.
_________________
Our cars get old, we get old but driving an old VW never gets old!

[raygreenwood]

[oprn]

It doesn't sound anything like the natural gas I am familiar with Ray.

That really sounds like propane.
_________________
Our cars get old, we get old but driving an old VW never gets old!

[raygreenwood]

[oprn]

Ah! That makes more sense, no I have never seen a LNG filling station.
_________________
Our cars get old, we get old but driving an old VW never gets old!