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Compressed Natural Gas?
Now there is a new question for us. How can I make my 4.5 run on Compressed Natural Gas? What would it require as far as injectors and such, anyone have any idea? 1972 4.5 D-injected
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A friend of mine has a 50's Bentley which was adapted as a dual fuel vehicle (gasoline or propane). IN that conversion you shut the flow of gasoline off and run the carb bowl dry before introducing propane. My recollection of other cars which have had this done is that they do not operate significantly more efficiently on gas than on gasoline...in other words it will not cost you much less to run a car on LNG or propane than on gasoline, but you never know until you try it I guess. Then there is the tendancy for LNG to explode if the tank were to rupture in an accident...could be something of a downside
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz |
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There are no shortage of cars in the Netherlands that run on alternative fuels LPG or CNG. Their motivation is the different tax structure on these fuels.
As much as gas is expensive in the US now, it's always been this bad or worse in europe as an incentive to not have big gas guzzling cars. -CTH |
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speak of the devil!
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz |
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I have my basic K jet 500sel running on dual fuel, petrol/propane. Its a pretty easy conversion if you go for the single point system.
You need to introduce the gas by means of a Mixer. This simply plums inline with the air inlet of your engine. The mixer is then attatched to a vapouriser/reducer, which converts the compressed liquid gas into low pressure vapour for introduction into the engine. This is plumbed into the tank, which I have located in my trunk. On my car, I simply have a relay to turn off the fuel pump when the propane solenoid opens. I would imagine on an older EFI, you could disconnect the injectors by removing the common earth, so the computer is still running and controlling the idle etc, and the fuel pump is still running, to maintain pressure for when you next start the engine. Hope this helps
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Ben '85 500 SEL '85 928S2 '88 560 SEC '90 750i |
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CNG is a real technical nightmare,It has been used in New Zealand for over 30 years,it's NOT Propane!.To obtain the gas ,you either have to have access to a CNG supply station or you can have a pump in your home garage connected to the town gas supply.This can take several hours to fill so you connect the car in the evening and leave it to fill by itself.In the morning the car will be filled and will have shut itself off from the pump.
In this city ( Brisnyland) we also have Volgren Busses running on CNG,the range is only about 400kms and if the level is getting down ,the bus must be returned to a depot and refilled,its a major headache if it runs empty. The ONLY set up with either CNG or LPgas ( propane today is to have Injection.You will actually have more Horsepower with the injection than gasoline. The number of injection suppliers is grownig by the week. http://www.blazegas.com/kits2.html http://www.lpg2000.com/products.html http://www.classiccartimes.co.uk/features/Workshop/LPG/Feature.asp?ArdSI=2a2f396967c7706d5d172ac64e0a16e0 |
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Fred
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Current: 2021 Charger Scat Pack Widebody "Sinabee" 2018 Durango R/T Previous: 1972 280SE 4.5 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi" 1999 Chrysler 300M - RIP @ 221k Last edited by Tomguy; 06-12-2006 at 09:44 AM. |
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The ignition timing curve is different too, as at one point it goes flat.
My folks had a two motorhomes with propane ability. The first one wasn't all that great, but the second one (Promatic, I think) worked quite well. Back then, the GM chassis had a lot of problems with vapor lock - this could easily be "cured" by running on propane until you got back into some cooler air. (GM's fix was to have you run a 1/2" steel line from the tank, along the outside of the frame, and then to the carb.) It also helped to wrap the lines in asbestos rope, and have plates that consisted of alternating layers of aluminium and asbestos gaskets, mounted between the carb and the intake. The big advantage for my folks was, filling up in Mexico city for less than $10
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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein 09 Jetta TDI 1985 300D |
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for a start,it's NORMAL to have a igniton module wired in so that when the car is switched over to LPG the igniton is advanced to take adantage of the LPG's 110 octane,NO MORE flat spots. Conversions today are on new vehicles with ELECTRONIC ENGINE MANAGEMENT and injected LPGAS will give a LOT more power than you can imagine. I have seen conversions on Hot chevies pushing out an easy 600+HP on the dyno with twin vaporisers to keep up with the Fuel demand and certainly no worries about flat igniton curves etc . As for the chance of an LP gas tank exploding in a crash...yeah right,the tanks are made from steel that is 1/4" thick with safety valves etc which automatically shut off the fuel if the lines break. . and then have a look at your gasoline tank sometime and tell me how thick the sheet metal is. With the Fuel companies robbing us blind and lieing to us with the lamest excuses offered since Nuremburg 1946, LPG etc is going to be the best option for most of us in the years to come. |
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You may not like it,but they were fitting them in 1965 in Germany at Daimler Benz and 41 years of mercedes owners having been fitting them ever since.... in fact my W126 has a set fitted new in the factory which also have 108 part numbers. what you didn't comment on was the Truck LP gas tanks in the back.those are for underbody mounting on large trucks not for mounting " end on " in a car. |
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I meant the steering wheel, NOT the bundt cakes! Should have made that clearer!
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Current: 2021 Charger Scat Pack Widebody "Sinabee" 2018 Durango R/T Previous: 1972 280SE 4.5 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi" 1999 Chrysler 300M - RIP @ 221k |
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That said, the cleaner emissions of LPGAS, CNG, propane, and butane are good things on their own merit. Also, you seem to miss the important difference in fuel tanks is not purely the flammability issue, but the PRESSURE issue. You can have a pressure explosion in addition to a combustion explosion. Not just a big boom, but a big boom with shrapnel. And your comment about oil companies robbing you blind shows a large amount of ignorance and what appears to be a reliance on urban legend and mis-informed media. If you were in the oil business (as I am) you would laugh at the folly that is spewed by the "news" every day.
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MB-less |
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