LPG Fumigation

**p38arover** · 1st September 2005, 09:30 PM

Originally posted by Ace
But does the LPG stretch the diesel out enough to offset the cost of buying the LPG in the first place?, and how long would it take to offset the cost of installing the kit? Matt

One buys this kit for the improvement in power - any fuel savings would take forever to cover the costs. It will increase your range but you have actually added another tank containing 30 litres of fuel.

Ron

**abaddonxi** · 1st September 2005, 09:31 PM

I really like the sound of this.

Saves money, clean, good for the engine, better for teh environment, more power.

Does it do what it says?

But, from the couple of websites, all I saw was testimonials and dyno results with pictures of their dyno in the background.

I'm a bit wary of fuel improvement gadgets.

This guy http://www.dansdata.com/danletters102b.htm and here http://www.dansdata.com/danletters071.htm does a great line on debunking this stuff - scroll down to find it.

Point is that if it does the trick and is genuine wouldn't they have reference to independant testing? Something outside of their own sales pitch.

The flip side of this is that I've never heard anyone question LPG as an alternative fuel source.

What I mean is that ther really isn't a question that LPG does what it says. This other stuff is almost smoke and mirrors. I guess it is the difference between a fuel source and a fuel extender.

Come to think ofit, last time I got LPG on I did it 'cos I knew taxi drivers burned LPG and it was cheap (14c a litre, don't you just wish.) I think it went up to 17 the week I got it on and 21 in the next couple of months.

So, does anyone know of this diesel/LPG thing actually doing what it says?

Cheers

Simon

**p38arover** · 1st September 2005, 10:12 PM

Originally posted by abaddonxi
So, does anyone know of this diesel/LPG thing actually doing what it says?

Come out to Penrith a test drive the Defender or Patrol with it switched in and out.

It seemed to work exceptionally well when I drove it.

Everyone keeps thinking improved fuel economy. Forget economy in terms of litres/100km which is what those site you referenced are talking about.

If there is any economy changes it is in the extended range from the greater fuel load and the fact that 30 litres of the fuel is 1/3rd the price of diesel.

Look at this as a performance improver.

Oh, it's not their dyno. They don't have one so they can't fake the figures. That's a local commercial dyno operator.

Ron

**abaddonxi** · 1st September 2005, 10:26 PM

Damn, now my brain's started working.

check out these websites
http://www.iwemalpg.com/Diesel_LPG.htm
http://www.radisol.com/dieseldynamics/
http://www.tinleytech.co.uk/lpgsys.html
http://www.autogasonestop.com/diesel.htm

Now

What do they do about RTA compliance?
Do they guarantee the installation?
What happens if my engine blows up 'cos it has all of this kryptonite under the hood?
If the system is as simple, in terms of LPG injected to performance/tuning as the first link suggests why does it all cost so much?

The site implies that diesel use is monitored and LPG injection is controlled by a simple percentage of diesel used on the fly.

I had been thinking that all the money was in the computer, I guess that was the wrong idea.

Or you could read this page
http://www.mrsharkey.com/lpg.htm which seems to explain things quite well.

He is mad, though.

I reckon he must have spent about $100 on his system. and for the extra $2900 or so I'd hope not to get rust or a bbq bottle.

Well that's my rant of the moment.

Cheers,

Simon.

Ah, if you want to read some of the science http://www.paper.edu.cn/english/process/do...?file=200508-37

**abaddonxi** · 1st September 2005, 11:58 PM

Just can't leave it alone

<div class='quotetop'>QUOTE</div><div class='quotemain'>The fumigation process is as old as old man Diesel himself, it was actually the first process used before injection was introduced. They called it "Erd Gas" or "Earth Gas", more commonly known as methane. Small to moderate amounts of methane allow for substantial power increases of the engine, so the diesel amount was reduced to retain the standard power levels. This system is in wide use around the world, and may known as "Pilot Ignition".
Propane has different combustion characteristics than methane. Using small amounts can provide significant amounts of power increases but using more will provide combustion pressure spikes which can indeed pop head bolts, burn turbos, scorch pistons and cylinders. Repeated in field tests show that using propane substitution for diesel at ratios much over 15% can lead to dangerous engine conditions, but higher substitution ratios can be used if diesel levels are reduced.
Some of the do-it-yourself websites claim "user adjustable power levels"(!), "easily removed if the vehicle needs to be returned to the dealer for engine warranty service"(!), "the use of LPG acts as a catalyst to make the diesel fuel burn more completely"(!).
Hmmm, maybe I missed something in the "hype and marketing" classes I was supposed to attend! Sounds like bull droppings to me!
Franz[/b][/quote]

From this site http://www.eng-tips.com/viewthread.cfm?qid...d=123560&page=5

and this page
http://www.eng-tips.com/viewthread.cfm?qid=7832&page=1

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