LPG Systems

try putting it on a 80-100 series and compare dyno figures to petrol i beleive these are the vehicles people were talking about..

I had an Impco system in my 60 series. All I can say is it was an old XC taxi sytem with 500000 miles on it and cost me less than $105 to buy. There was nothing i could not fix on it that didnt require 2 screw drivers and a can of aero start to clean the units.

tune up where done by ear after paying for 3 expensive dyno tunes ,I had a old mechanic show me how to tune by ear and that was the best that old motor ever run. For 3 months out bush I used to push start it and it would run all day.

Now I'm not stateing that SPRINT is better but I will say in my opinion the old style IMPCO system was one of the hardest running systems I eversaw. I recommend Them anyday.

shadow

Winnjimmer, what makes you think that the ECU on the sprint gas system is any more sophisticated than any modern gas system currently available. All fuel injected cars running an oxy sensor have to have a closed loop system just as you describe.
I've got an Impco closed loop system on my EFI GQ and I'm happy with it.
Regards Andrew.
ps: If you want sophisticated gas systems, the way of the future is gas vapour injection where gas is injected into each inlet port just like petrol with its own dedicated gas injectors.

""any experience of Impco but I do wonder where American technology comes from as they are still trying to run cars on propane over there.""

I was just wondering what you think LPG is????
The stuff you put in your car is called autogas which is normally a blend of propane and butane, supposed to be 50/50 but is more likely to be 60% butane & 40% propane.
At least the yanks use propane and not the bleep we get here.
If you want to use wog-gas stuff on your car go for it, but personally I prefer Impco.
Look at this way, Impco was designed to run big engines [ala yankmobiles]
all the Italian and Dutch gear was designed for small engines.
BTW there is a servo in Broadmeadows near Ford that sells autogas or propane[2cents a litre dearer]


Leave nothing but footprints, take nothing but photos!

I decided to come back once more after doing a bit of research and I submit the following.
1. I don't know if IMPCO gear is better than OMVL or vice versa. I do know OMVL works fine and you advise that IMPCO does too.
2. According to Hawley's Condensed Chemical Dictionary LPG is a by-product in petroleum refining and would contain variable proportions of butane,isobutane,propane, propylene,butylenes and their mixtures. The butylene mixture for example would be butene-1,cis-butene-2,trans-butene-2, and isobutene. So LPG is not just a mixture of propane and butane.
3. BP would not divulge what they thought was in their LPG but said that they assume that it is 50:50 propane butane so that they have a formula to set the price in Australia according to the daily prices for propane and butane in the Singapore World Market. We seem to have construed that to mean that LPG is actually 50% propane and 50% butane and we are not correct.
4. There are 1.5 million vehicles running on LPG in Italy ( the home of OMVL) compared with 350,000 in USA and 350,000 in Australia. 350,000 is such a small proportion of the USA motoring population that garages have not put in Autogas pumps and until they do, the situation is unlikely to change.
5. It is important that the recipe for LPG remains consistant, because variations in components require different air/gas ratios. For example if you were to use some of that straight propane from Broadmeadows your mixture would be way out.
6. Little Johnny may have been thinking ahead of all of us when he introduced the excise on LPG, because LPG represents 5% of the oil refining process and we LPG users already account for 3% in Australia. The last thing anybody wants is for the stuff to become scarce.
7. IMPCO have factories all over the world. The biggest seem to be in China, India and Italy. Their main focus seems to be on gas equipment for fork trucks as that may be the biggest market.
8. The dedicated LPG BA Falcon does not use a seperate gas computer but has an ECU designed by them to work with LPG. They wont say who makes the condensor and mixer. THe BA would undoubtedly have much more power than my ED but its LPG consumption is 6.5litres per km which is not much better than my long term average of 6.2.
9. Ideally we would be running on LNG but the problem of the high pressure required to keep LNG liquid at room temperature seems insurmountable at present.

I've had 5 vehicles over the last 10 years on gas using both systems and haven't had one bit of trouble. The omvl system on my ED was a great performer, the system on my present AU, factory system whatever it is, is simply stunning. Did 300,000 k in my VL Commodore on impco, not one problem, converter never cleaned. I love the stuff, it's been great to me.