Thread: Petrol vs LPG payback calculator

Originally Posted by black betty

Or you could use the one on the LPG Australia website

Mines better Their one is useless - and is only a very basic 'savings' calculator. It doesn't take the fuel consumption difference between lpg and petrol into account nor does it ask what your installation cost was. I'd much rather see how many actual km's I'm going to have to travel for pay back than base anything on a 'weekly spend' amount.

Liquid injection would be fun though ...

I think the main think about gas is getting the set up you want even tho it will cost more than you want to pay.

My installer talked me out of a doughnut tank because he said it would cost too much, when really he could not be bothered to make up the brackets. A decision I regret every time I load up the car

Hang on until you find someone who will do the 135ltrs for you.

Donut tank fitting list: blue lpg auto tanks lists a 68 litre usable donut for the P38A and looks like a 15 minute job to mount with bottom studs.

Originally Posted by bee utey

Donut tank fitting list: blue lpg auto tanks lists a 68 litre usable donut for the P38A and looks like a 15 minute job to mount with bottom studs.

Called them (bluelpg) yesterday to get a price on that tank. $750 was his reply and they've got lots of them in stock, they're in Melbourne also. As a comparison buying an eBay one from RPI is $760 for a claimed 76litre donut - or $1200 for their proprietary 135litre(water) twin scuba (90l+45l) setup that requires the spare tyre well to be completely removed. Don't know what postage on such a large heavy item would be though ....

Got an answer email back from Ausindustry also - overseas parts are eligible for the grant as long as you have a proper business receipt and they meet australian standards. So the Marrelli $1000 vapour injection system is looking better and better

I can't imagine how you would fit a 135 litre twin tank. I'd love to see a picture. Mind you if you want a cheap tank you could always tub the floor of the spare wheel well and fit a standard APA A90 tank (72L usable), you can get a cheap second hand reco tank for as little as $220. I have done two of these and they don't actually look that bad, the underhang is not more than 100mm.

How good is the parts back-up on the Marelli kit? I just had an injector fail on an Impco/BRC kit and it has to go away for a week for warranty exchange...

Originally Posted by bee utey

How good is the parts back-up on the Marelli kit? I just had an injector fail on an Impco/BRC kit and it has to go away for a week for warranty exchange...

I'm conversing with them via email at the moment. Any problem is going to take a while to rectify via UK though =/ Always a problem buying overseas stuff.

As to the twin tank 135 litre install - its an RPI engineering install. They use a 90l fat tank and a 45l skinny tank - the skinny tank sits on the rear cross member with the fatter tank in front of it. They've got limited info on it at their website RPi Engineering - Specialized Rover Engines - faqs



I've wondered why I've never seen a big fat scuba in a cut away wheel well myself - as you suggested. I figured there must be a reason, but I don't know what it is. Maybe the RPI 90l one is as big as you can go already without interferance on the rear cross member (or maybe it already is an A90 ?).

I've asked these guys for a quote too About Conformable Tanks-Propane Performance Industries -Cutting Edge Technology in Propane Gas Tanks Their tanks look really interesting and for any given space their tanks provide the most usable volume.

I had a vapour system on my P38A with a 90 litre (WC) tank behind the seat. I fitted a canister air cleaner - see 4.0/4.6/P38A Air Box Replacement

I pulled this out a few years ago (I must sell the vapour system...) and fitted a KME sequential injection system with a 54 litre (usable) toroidal tank in the wheel well (to get the load space back). I have a Kaymar rear bar and wheel carrier. Oh, since changing to sequential, I've reverted to the original air filter.

Eventually, I think I'll pull the toroidal tank, cut the wheel well out, and fit a couple of cylindrical tanks for more capacity. I'm sick of the limited range of 54 litres.

That makes sense now with the picture, looks like an A90 up front and a 900/240 over the back bar. Its actually only 108 litres usable. I can't see how they get the tyre well airtight though, there are naked gas fittings everywhere. It's only a carpet covered hatch normally and you need tool-free access to the tanks for servicing and emergencies. And they painted the tanks black, my tank tester wouldn't touch them with a 4 foot pole like that, says its illegal!

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.

Like Ron I use a canister type air cleaner for vapour systems, the earlier '87 one usually. But the original air box is much better with injection or snorkel conversions.

Like the conformable tank, just would be a hassle getting it approved in Oz to AS 1425.

BTW I dislike the term scuba tank as applied to LPG, I suspect it's no-tech-speak for skinny-lookin-things. Manifold tank is what welded-together collections of cylinders are known as in the trade. Popular in Fords.