shadetree30 Reader
Jan. 9, 2013 4:19 p.m.

Has anybody done or contemplated doing a CNG conversion?

My thoughts would be on a DD or car hauler...

GameboyRMH PowerDork
Jan. 9, 2013 4:25 p.m.

I've thought about it, common in the rock crawling world, you can run dual-fuel by simply putting the CNG carb in the intake ahead of the gasoline carb/efi system and cutting the gasoline.

Knurled UltraDork
Jan. 9, 2013 7:12 p.m.

We're doing them now. The installation isn't cheap but the people who've done it find that the conversion pays for itself in a year or so. Assuming you spend $20k a year on gasoline, anyway. Given the size of the tank required for any kind of meaninglul range, I'd only do it to a pickup. Figure a tank that is 20 gallons-equivalent will take up the width of the bed, and the diameter will be almost the height of the bed. Steel or spun-carbon tanks are available, with the expected tradeoffs of weight vs. expense.

A gallon-equivalent of CNG is about $.80-2.00 depending on if you buy it from a filling station or have a home fill station.

The new systems are neat. They interface with the PCM in such a way that the computer doesn't know that it's firing the wrong injectors. It's kind of like a piggyback but in reverse.

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