A modern Gas Bag car

[some_other_dave]

Take a look at the picture in the first post, and think about what that bag does to the CdA of the car.

A balloon would pretty much do the same.

-soD

[Sven7]

So if you were to go through all this trouble of modifying your engine to run optimally with this stuff (which it sounds like they had to do even with crude 40's cars), where would you get large quantities of methane gas? Would your car even be able to switch over to a different fuel on the fly?

CNG does sound like a much better solution. Can you modify a gas engine to run it?

[Staska]

Originally Posted by Sven7

So if you were to go through all this trouble of modifying your engine to run optimally with this stuff (which it sounds like they had to do even with crude 40's cars), where would you get large quantities of methane gas? Would your car even be able to switch over to a different fuel on the fly?

CNG does sound like a much better solution. Can you modify a gas engine to run it?

You dont't need a mechanical modification in engine. You need - a mixer device for fer feeding correct ratio of methane and maybe ignition time fine tune for spark ignition engines.

For diesel you don't need to modify anything. It will run on dual fuel then gas is present, or run on single diesel then gas is not present.

[Sven7]

I guess you'd have to do a VW diesel then because that's the only reliable diesel in a small US market car that I know of. If you have a MK3 Golf diesel I'd say go for it, but maybe it wouldn't work so well with VTACK or Geos (Suzukis).

[niky]

As to where, the typical source for the Indian small-scale inner-tube bags is digester gas, fed directly to a venturi/carburetor.

It's pretty easy to make digester gas at home. All you need is an airtight drum filled with waste, some cow manure and water (absolutely no air) and a hose to attach that to your balloon or storage container. If you use a rigid storage container and want some pressure, you'll need a compressor attached to that, but if the gas production is large enough, you can also use that to power the compressor.

[redneck]

Originally Posted by redneck
My thoughts on this would be to put the bag in a small lightweight trailer with a hard shell that could be shaped for aerodynamics.

Originally Posted by euromodder

At near-atmospheric pressure, the trailer would hold so little gas that it'd be pointless to tow the trailer around..

Note, I said bag (balloon or bladder). If the commute is short, there should be more than enough gas between fills. (refilling daily if need be)

The main points for using a trailer.

1. to allow a larger bladder than could be placed inside a vehicle.
2. to separate the occupants from the fuel source in the event of a accident.


Using compressed gas in a approved container however, would be the best thing to do.

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[racerc2000]

Originally Posted by redneck

Using compressed gas in a approved container however, would be the best thing to do.

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wouldnt you then require a hazmat cert just to drive your vehicle then and a sign stating what it is carrying?

[euromodder]

Originally Posted by redneck

Note, I said bag (balloon or bladder). If the commute is short, there should be more than enough gas between fills. (refilling daily if need be)

Same difference - a balloon is at what 1.5 x atmospheric pressure maybe ?
It's not going to hold a lot of fuel.
Why introduce range anxiety to gas cars ?
Driven beyond their gas range, they'll need petrol.

The main points for using a trailer.

The main point against it is weight.
It's going to weigh an awful lot of pounds for a ridiculous equivalent amount of gas.
That weight is going to cost some gas as well.
Hence ... why ???

[redneck]

Why introduce range anxiety to gas cars ?

That's a new one on me. lol

I wonder if they make a pill for that...???

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[Staska]

Adsorbed Natural Gas Technology Applications

Another approach for biogas storage. Absorbed natural gas storage.