Liquid Gas Systems for our Zeds, can it be done?

50L is small? Its pretty big mate you wont get stuck anywhere with something that size lol, when you think about it 60 or 70 L ? And its as good fuel econ as fuel, how is that small?

 

I got the girl on the front desk, probably not the installer. I was enquiring about the trials they are publicising. (alway looking for a bargain
I would also prefer someone closer to home in the central west.
I'm not going to give up on this idea yet.

 

MRC Have told me multiple times they wont do it unless there is a kit for it, ASR I haven't tried yet though (although I asked MRC awhile ago now but thats the answer he gave me a few times over the years)

 

Yeah I dont think they'd do that, worst case it'll always be cheaper than petrol (and thats standard petrol) and we mostly all run 98 in ours so you'll be running 100 octane rated LPG at below the worst rated unleaded fuel cost wise either way, but I still think the gap will be pretty big, has to be with the whole (and I think bullshit) carbon issue they have going, LPG is cleaner so how can they charge people for that if they are pushing it so hard. Also like you said the taxi's will have a field day with the government if push came to shove.

 

That would be right....
There arn't many mechanics available nowadays, they are just part fitters.
Yet they still charge more than a doctor per hr

 

LPG

costs less than petrol to buy so the running costs are less, but you use 15% more LPG per mile than petrol. So that 50L lpg tank stuck in the spare wheel spot, is really a 35L tank.

 

Not sure you have your maths right.
LPG tanks can be filled to 80% so that equates to 40lt on a 50lt tank.
15% more usage is for the manifold systems (liquid converter to fumes)
Injection systems are fairly close to equal literage of petrol, and the econnomy is relational to the size of the right foot.

My last long run was 539klm and the fuel light did not come on (might be blown - don't know) on a full tank of petrol, 1990 NA

So 40 tl LPG should be good for 400klm (300 with a good size 9 right foot)

 

Exactly, 15% more usage was with the old dual fuel first systems that came out, vapor injection is the same consumption as fuel and direct injection is better again

 

Direct injection returns BETTER economy apparently than Petrol so the 15% more argument is not correct. And that 50L tank can be filled to 80% capacity with gas as far as I know to account for expansion = 40L gas available. Seems sufficient to me.
Some of these quotes are reasonable for the gains attainable.

 

$5K? Don't forget you need to modify ECU so more like $6k from my previous research. LPI (liquid inj) yields better power & economy & octane is = to around 110+ RON. If we could get a group buy, I'd be seriously interested

 

Question

I love the concept of this, direct injection LPG, dedicated to LPG with a good tune would be great, but why are the tanks always donut shapped, why dont they make them to suit the contours of cars better especially for cars that are commonly converted?

 

Gas storage 101
Donut or Cylidrical are the strongest and safest for storing a volatile liquid as LPG.
The last thing you want is a tank to rupture on a seam or corner.
LPG expands to 7x its liquid state when exposed to the asmosphere.
When a gas tank blevies (boiling liquid expanding vapor explosion) the resulting explosion....well you get the picture.
Gas tanks are built to withstand fire (up to a point) prolonged exposure to high temprature will eventually weaken the steel to the breaking point.
LPG tanks are also designed to withstand impact, and dent not tear.
If an impact occurs at such a velosity as to rip the steel the occupants would be already dead from G shock.

 

Wonder what kind of size LPG tank you could fit in place of the normal fuel tank then

 

Don't forget that LPG prices will always rise with petrol prices. Pretty much on par % wise as petrol increases.

 

Yeah I figured that but if this carbon tax goes through I think the gap will grow as LPG is far cleaner than petrol so they cant tax something that is cleaner when they are pushing clean energy , more likely tax petrol extra instead (you'd hope so but the government are pretty stupid, shouldn't give them that much credit)

 

I don't think they can effectively add a tax to petrol, as the carbon emmisions of a lean burn engine such as in most modern passenger cars, is far less than say a 1967 427 big block vette with no cats.

No, if the carbon tax gets refined and makes it through parliment, then I would guess that the tax would be added to registration costs, such as they do in the UK where it is based on the emissions stats from the manufacturer.

Also the primary focus of the carbon tax is on manufacturing, taxing them for the carbon emissions, which will then flow through to the price of fuel.

So we'll likely get raped twice.

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:br:

 

Be aware of this:

Based on the usual rough analysis that LPG is cheaper provided it is less than half the price of petrol (because you don't get the same energy out of a litre of LPG as you get from a litre of petrol), then for a comparison of these excise changes with petrol say double those figures.

There are other "green forces" at work who are lobbying for the full excise to be charged much earlier than that as a disincentive to we horrible types that like to burn fossil fuels. However, I don't think anyone is listening.

Nevertheless, I don't think the outlook for LPG is all that bright, and the cost of entry is huge.

 

Aye I agree, but the energy burned is now the same or slightly better (but only with the newest and most expensive technology they offer) struggling to still come up with 5 - 6 grand to get it though, 12.5 cents though by 2015, fuel will be what, $2.50 or $3 a litre by then, so I dont mind if gas is 12.5 cents a litre more expensive (70c now so 82.5 cents then lol) but yeah again the start up cost is huge.... and doesn't help every year the incentive is getting less and less and now a cap is coming in to boot....

Be nice if the government actually made it easy for us for once hey?

 

LNG?

Some of the buses in Brisbane are LNG powered, we have heaps of it in here, true its doesnt make as much power but its dirt cheap. Can it be done to cars in the future?