Petrol vs LPG payback calculator

**Gullible** · 6th February 2010, 04:36 PM

Dam I must learn too type faster.

I was going to say, whoever gets the licence to distribute the conformable tanks will make a lot of money. I'll swap my 60ltr 3 bulky manifold tanks for a flatter tank that weighs less and gives be a larger volume.

**big guy** · 6th February 2010, 05:08 PM

Hey there- this sounds like Jilden- An LPG fitter I would definately trust with my car.
Done 2 of mine so far and never really had any probs.

Good to see you on here now.

Regards

Frank

**Junosi** · 6th February 2010, 05:19 PM

Originally Posted by bee utey

Just linked to the RPI site, saw their cover. How do you access the tanks for servicing? I think I should follow this one up.

Only reference I saw about that was that the false floor is 'sealed and then screwed down' So for servicing unscrewing and unsealing

Pity you're not in Melbourne or I in Adelaide, I need to find myself a helpful fitter now.

**bee utey** · 6th February 2010, 08:45 PM

Originally Posted by Junosi

Only reference I saw about that was that the false floor is 'sealed and then screwed down' So for servicing unscrewing and unsealing

According to the gas fitters' bible AS1425, clause 3.18.2., "It shall be possible to operate the service valve for the purpose of servicing, or a filler shut-off valve if fitted, in the installed position" or if from inside, (b) ...."access shall be by a gastight captive hatch which can be opened without tools"

Betcha can't do it on this setup, unless you cut a hinged hatch in the middle with a wingnut latch or something. Quite easy to fix.

**Gullible** · 7th February 2010, 10:15 AM

Wouldn't it be the same as any underslung tank, reach your hand up from under the vehicle and turn off the valve?

No more difficult in an emergency than pulling all the luggage out off the boot to get to the wheel well mounted tank.

**3toes** · 7th February 2010, 10:53 AM

I looked at this set up to extend the range on mine without putting a tank in the boot and reducing cargo space. With the twin tank set up from RPI you are also up for a new rear exhaust as the factory standard pipe will not go around the new twin tanks. They sell a stainless one of their own design on the web site. Also they have not managed to sort a gauge to measure the amount of gas in the twin tanks so you are dependant on watching the distance traveled.

**bee utey** · 7th February 2010, 11:35 AM

Originally Posted by 3toes

I looked at this set up to extend the range on mine without putting a tank in the boot and reducing cargo space. With the twin tank set up from RPI you are also up for a new rear exhaust as the factory standard pipe will not go around the new twin tanks. They sell a stainless one of their own design on the web site. Also they have not managed to sort a gauge to measure the amount of gas in the twin tanks so you are dependant on watching the distance traveled.

Twin tanks should be able to have their sender units wired in series if they use australian made valving. There are a large number of different senders available. Otherwise it used to be common to connect the large tank sender only, gives you the best guess.

As far as access to tank valves is concerned, I can't think how you would get your hands above the tanks from underneath.as there are chassis rails all the way around the well. On Falcon dedicated gas cars they actually put the shut off valve near the bottom of a pair of welded-together tanks, then it's easy. Maybe someone should talk to APA to see if they would modify one for the P38...

**996TURBO** · 8th September 2011, 01:37 AM

Guys, i'm thinking about making myself same setup as RPI.
Already sourced the same tanks and parts but i need to think about tank frame.

**Pedro_The_Swift** · 8th September 2011, 06:21 AM

this should draw out the rattlers,,,

https://spreadsheets.google.com/view...DQ4NzA5YWI&ifq

**ozscott** · 8th September 2011, 06:46 AM

I love the cost savings on LPG. However it depends how far you go with maintenance too. I have had mine on for about 6 years now and it has paid for itself well and truly on my 180,000K D2. However the LPG we get is rubbish and only a month or 2 after I got me new converter fitted from contamination in the old one (which was fitted from contamination in the old one...) it got...contaminated. You know because it wont changeover to LPG when cold - it requires hot water circulating through the converter to make the contaminant less sticky so the diaphragms and valves work. When hot switch over from petrol is fine. I just pulled the bottom plug again and it was half full of contaminant. Cleaned out the plug, but I know the converter is full of it. I had put an expensive little inline thermostat on it too to stop the contaminant caused by secondary cracking (I have posted a link up to a US site about this before). Anyway, because it stopped my heater matrix from getting very hot and because it does not seem to have worked it will come off now.

I dont mind living with the converter as is, but if you had to replace it every time it got contaminated you would quickly erode the costs savings.

Cheers

PS. I have a BP card and a Shell Card - and they are all I use. And I have tried only Shell and only BP..

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