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Old 11-25-2013, 01:59 PM   #2 (permalink)
EcoModding Lurker
Join Date: Sep 2010
Location: Canada
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My own CNG project is like this:

My own project is like this:

1.I have a diesel truck and I want to add CNG to get better fuel economy and extra power...

2. I only need 2 GGE for my daily driving. 50% CNG 50% diesel will give me 60-70 mile range. If I need more I can just use diesel...

3. As a DIY project I will try to keep pressure as low as possible/practical. My tanks are 3 ft3. To get 2 GGE@ 3 ft3 I need to pressure CNG to 1200-1300 Psi.

4. I don't like 3-4 stage air compressors because they are noisy, expensive, run very hot, expensive to fix/rebuild....

5. I am thinking about "hybrid" system:

1 stage is going to be AC compressor (York 210 style). It will boost pressure from 2 Psi to 200 Psi. This compressor is a real beast and can run 200 Psi all day long. Cost is low ($50 used-$150 new) parts are cheap. Easy to fix. Compressor will be turned by hydraulic motor.

2 stage is going to be hydraulic cylinder pushed/pulled by another hydraulic cylinder

I decided to use hydraulic power unit to run compressor (via hydraulic motor) and hydraulic cylinder (hydraulic side). In this case I can put power pack isolated from gas compression unit and I don't need to worry about arks and sparks....

Now let't talk about CNG....
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