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Old 11-26-2013, 03:49 AM   #41 (permalink)
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Yup, screw compressor as mentioned earlier, readily available at 275ish psi. But if the tanks are cost-prohibitive then what's the point. Do that bit of research. Also ask about flow rate and figure if two tanks will supply enough for your demands.


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Old 11-26-2013, 03:52 AM   #42 (permalink)
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Also do a little bit of ROI (Return on investment), figure out how much you can spend and make it back in say, 2 years, including ongoing compressing costs. 3600 psi vs 275 is going to have a higher ongoing cost (edit: and initial costs)

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Old 11-26-2013, 03:58 AM   #43 (permalink)
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I will try to fill 1lb tank with just cng and second 1lb tank fill with activated carbon and than cng. Both will be the same pressure. I have some activated carbon from osmosis filter... I will try it tomorrow...
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Old 11-26-2013, 04:04 AM   #44 (permalink)
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k, make sure you don't blow carbon chunks into a fuel system... And there is a lot of science in the specific carbon used apparently, and we don't know how much production adsorption tanks are until somebody makes the call. If the whole system costs less than your 2 year ROI then maybe it would make sense just to buy their system.
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Old 11-26-2013, 04:08 AM   #45 (permalink)
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The problem is their tanks are not DOT tanks and nobody knows how they will perform in vehicle.... It might be better to get cng or even lpg tanks (max 275 Psi) and add activated carbon into them....
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Old 11-26-2013, 04:11 AM   #46 (permalink)
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But they bounce around in the back of a truck... and who knows what they do to the carbon. Still worth an experiment though.

Anyway, fyi you will need to up the working regulated pressure of your vehicles propane system about 2.45 times to get the same energy out of it, or otherwise ramp up the flow.
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Old 11-26-2013, 04:18 AM   #47 (permalink)
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But yah, 275 psi is very doable at home, and even carrying 1 gallon equivalent for "cheap" natural gas would be a very enticing alternative to full-on electric conversion, giving much greater performance and comparable range for a fraction of the conversion cost. Fingers crossed
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Old 11-26-2013, 09:58 AM   #48 (permalink)
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Quote:
Originally Posted by vlad View Post
The pressure of CNG going to engine will be low
From what I've been seeing / reading , the CNG is fed into the air intake of a diesel @ low pressure.
(Getting it in along with the diesel would require very high pressures on CR or DP set-ups.)

The amount they feed in, is regulated by the TPS (throttle), and diesel injection is reduced because you need less throttle to keep a given speed or engine load.
(it may be necessary to dampen / reduce throttle input from the pedal to the ECU to keep the car drivable as you're feeding in more fuel than normal - yet not too much as you still want to be able to drive it on diesel alone if you're out of CNG.)

Without throttle input, you can let it run on diesel and the regular idle regulator in the car.
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Old 11-26-2013, 10:05 AM   #49 (permalink)
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Quote:
Originally Posted by vlad View Post
This is really funny we can fly to other planet but can't make cheap pump for CNG. It smells very fishy......
Ain't going to get better with the new R110 regulation in the EU, that regulates extensive validation and re-testing etc. before anything can be used in a CNG or LPG system for a car.
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Old 11-26-2013, 01:35 PM   #50 (permalink)
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http://www.gl-nobledenton.com/assets...e_truck_DS.pdf

Iran is going all adsorption v/s cng. Note the carbon sources, and the picture of the carbon ingot (and all the other neat ideas). It's like the Schottky diode of NG

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