Lpg mpg

[M D E]

Managed to get 180 miles from 40lt the other week after filling up with BP it's been 8,000 miles since it's last service and i'm wondering if the fuel filter is dirty, as I use a small LPG filling tank next to a LPG conversion center. My thinking is this fuel is lower quailty than that of shell or BP as my performance drops alittle using this fuel. But it's only 56pence compared to my local BP at 69p.

[classicswede]

Originally Posted by Ben '71 1200

I get around 19mpg with an open loop mixer on the b230e in my 240..

It's an antiquated system made by a company called Bedini and is rubbish. I can easily adjust to do 25 or so but it slips out of adjustment after a couple weeks anyway. I also reckon my mixer is too big (no torque on smaller throttle opening so you have to floor it wait for the gas to catch up which feels most wasteful). I've just bought a closed loop conversion which should alter the fuelling to make up for the mechanical innacuracies that develop on such a regular basis meaning it won't need a fiddle so often (if at all, hopefully)

Edit: I'm also eying up a BLOS gas carb (variable orifice mixer) to try to improve the system to the point where performance and economy are up there with the sequential injection systems whilst staying simple enough to spanner on myself.

Best bet is to keep away from the closed loop system with engines of this age. If you burn anything much in teh way of oil the lambda packs in and will throw everything out fueling wise. I'm no fan of the BLOS carb but that is not to say it is not any good. The first port of call to improve your system would be to fit a regulator that actualy works. The Bedini one belongs on a tractor at best.

[Ben '71 1200]

Thanks for the advice

I'm well aware of the limitations of the Bedini system.. It's rubbish, and an upgrade is on the cards as and when I find something I like the look of.
To be honest, the closed loop upgrade is bought and paid for so worst case is that I have to replace lambda annually/take it all out and punt it on. The engine isn't as old as the car and fortunately doesn't burn any oil. I'll be using it based on the assumption that it will still have to be set up as you would an open loop system, but it should take into account mechanical wear/things drifting out of adjustment to a certain extent. I like LPG, but am very much aware that everything with it tends to be a compromise.

The Blos variable orifice mixer is a weird one.. I love the concept of it, but can find very little factual information about it other than people on land rover forums..

[classicswede]

If you have the AEB closed loop system you can choose to lock the default stepper position. This is a good idea as it does stop things drifting to far away from where they should be if teh lambda was to fail or anything else go wrong.

Vaporiser wise the only one to use is the OMVL R90e and is proven to offer the best fueling of any of them on the market.

I would like to try the blos but I'm not keen to throw that kind of money away on something that may well not work at all.

[Ben '71 1200]

Doesn't look like the kit has that option unfortunately. It goes against everything I know, but I feel inclined to take and apply the advice of an individual on a forum. I get the impression you know what you're doing though... Looks like that vaporisor can be had for just over £100 delivered.

The money I throw at this car to make sure the LPG running well is silly.. I should really just run it on petrol and be done with it! That defeats the object for me though. A hobby without a challenge or two would be dull.. From what you and others have said, I'd be best off rebuilding the entire front end of my LPG system. Sounds fun to me

Edit for Blos reference: That's my problem with it as well. Theory sounds spot on but they have only secured one UK distributor and the only forum that seems to talk about it has a regular poster that sells/exports the things from Poland. The problem is that modern cars would go straight to a sequential system and so potential market for Blos is never going to get any bigger..

[940_Turbo]

My 940 SE Turbo (HPT) does 20 mpg pretty much regardless of how or where I drive it. It likes German LPG sold by Aral though, and will generally pick up a 10% increase in fuel consumption on it. It has a Prins VSI system on it.

The only exception is towing, when it goes completely dipsomaniac. I once towed a twin axle car trailer with a Citroen 2CV van on it back from France. I was in a hurry so I was speeding; just slightly. This particular trailer tows well and I was in the 90s. I got through 46 litres of gas in 98 miles, 9.6 miles to the gallon. I switched to petrol sharpish and drove more sensibly!

[ADBS65]

I just sold a V8 Discovery after 11 years running it on LPG, before buying my Volvo. It did 15mpg on Lpg on a run, usually towing my caravan and around 12mpg around town. [Best ever was 18mpg and worst 9.9mpg] I checked my figures every fill. I got the same figures +/- 1mpg on the rare occasions I used petrol. There was no discernable difference when using either fuel on performance. I bought my Lpg from Carvers builders Wolverhampton, as it is cheaper than filling stations at 52p a litre. That equates to a price differential of 2.2 so 12mpg = 26mpg in monetary terms and you keep the V8 engine :-)
I suggest you check your local builders yards, boat yards and anyone that does Lpg conversions as quite a few now sell Lpg. Incidentally, quite a few taxi firms are using Lpg vehicles, so you could always ask them where they fill up.
Regards parts, I used a company called Tinley Tech. Very good and know their stuff. Prompt delivery and good after sales service.
Andy

[johnnyboy01]

Hi All my first post on the forum. I have a 4.0lt Range Rover and I get about 290 miles to 85 litres of gas on petrol I get about 320 miles to full tank which I believe is about 90 liters or so. Not got a Volvo yet but after a C70 convertible T5 within a month or so.

[johnnyboy01]

Sorry to hijack the thread, MDE is the tank located in the spare wheel well in your convertible? would be interested to know and see if you have any pictures.

[M D E]

Yes my 45L tank is in the boot and lost no boot space ... Here's some photos

http://picasaweb.google.com/m/viewer#search//C70%20LPG

Still enjoying filling my tank for £20 !