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E21, E30 General discussion and technical help for 1975-1991 3 series cars.

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Old 09-10-2006, 01:03 AM   #1
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Using propane with fuel injection

I know that for about $150 you can run a carbureted Subaru on propane, but I don't know how that would work with FI. Has anybody had any expierience with this? I'd like to have an E30 M3 one day, but I don't buy gasoline anymore.
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Old 09-26-2006, 08:12 PM   #2
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Please, don't buy a e30m3 and feed it propane. These cars are designed for gasoline. Get a beater sabb for that kinda stuff.
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Old 09-26-2006, 11:53 PM   #3
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i think it all depends on the combustion temperature of propane, normal gas contains octane, which is 8 carbon molecules, while propane which is 3 carbon molecules... basically i think that means its much lower combustion temperature therefore not very well? but, what the hell i have no idea wat im smoking
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Old 09-27-2006, 01:56 AM   #4
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Please, don't buy a e30m3 and feed it propane. These cars are designed for gasoline. Get a beater sabb for that kinda stuff.
I agree...or maybe a volvo
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Old 11-01-2006, 05:49 AM   #5
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If it's mileage you're looking for (and don't mind a few extra minutes every tankful) try this: add 1-3oz of pure acetone not the stuff you get from hardware stores but you get it at phamarcies (Walgreens,etc...AKA: fingernail polish remover/$2.59 - 16oz)
Acetone evens the burn rate of fuel, actually burns cleaner & adds a little "oomph" to the powerband. But you must experiment with it and NO MORE THAN 3oz per 10gals. (anything more than that - you're on your own)

If you want more info - e-mail me - I'll send you some data on it. (My dad was a chemist and we've been using it in regular fuel for my "bird" and other high consumption/race vehicles for 5+ years now and it's proving to be good for significant mileage gains)
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Old 12-17-2006, 11:25 PM   #6
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Right now running CNG sounds like a better idea to me. I'm not familiar with the early M3 engines, but know my way around the sixes alright. Maybe if I can get a cheap 5 series something I'll carburate it. Gas is going to run out one day.
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Old 12-18-2006, 01:13 AM   #7
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Right now running CNG sounds like a better idea to me. I'm not familiar with the early M3 engines, but know my way around the sixes alright. Maybe if I can get a cheap 5 series something I'll carburate it. Gas is going to run out one day.

the airforce uses CNG in all of the smaller trucks and flight line trucks.
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