CNG dual fuel Conversion for a Diesel

[EdJonesJeeper]

Is anyone running or installed a system like this? It uses both fuels to increase massive gains in mpg.



I have 2 CNG fuel stations near me and the fuel stays around $1.99 per gallon. I use my diesel as my daily driver and I could see how it could be cost effective if the install is not the price of a small car (10k is what I've seen from 2009).

Most of the duramax forums on the subject haven't been updated in a while and I'm hoping someone has done one of these conversions around NC and has long term results.

I'm not the only one that can be thinking about this.

http://online.wsj.com/news/articles/SB10001424052702304707604577422192910235090

 

[jeepinmatt]

Is anyone running or installed a system like this? It uses both fuels to increase massive gains in mpg.



I have 2 CNG fuel stations near me and the fuel stays around $1.99 per gallon. I use my diesel as my daily driver and I could see how it could be cost effective if the install is not the price of a small car (10k is what I've seen from 2009).

Most of the duramax forums on the subject haven't been updated in a while and I'm hoping someone has done one of these conversions around NC and has long term results.

I'm not the only one that can be thinking about this.

http://online.wsj.com/news/articles/SB10001424052702304707604577422192910235090

Without reading anything, I can tell you this:
The data information center in a chevy (pictured in the video) is completely useless for calculating the mpg on anything but a completely stock vehicle. As my signature says, my truck gets 29.2mpg according to the data information center in my truck, but the real numbers are somewhere between 17-18mpg

 

[OnlyOneDR]

The data from the dash is only measuring the fuel that the injection system is pumping into the engine versus the mileage it drives. So those dash figures above are the "diesel mpg" but when you calculate the consumption of CNG into the mix you are not getting that kind of mileage. I would doubt that you get any better fuel mileage whatsoever, since nothing in the system has been changed to actually improve the efficiency of the system, drive train, or vehicle at all. All you are doing is changing what kind of fuel the engine is burning. Could this potentially be less expensive than driving pure diesel? Sure, but at what timeline for payback?

 

[flatblackzj]

While the mpg display may not be accurate for the actual amount of fuel(s) being used, there's been a lot of work done in dual-fuel systems for CNG, LNG or gasoline when used in addition to diesel. Look into partially premixed combustion, at this stage of development, it's looking like about a 15-20% improvement in efficiency over any single fuel application. Of particular interest is that with the efficiency gains, particulate and NOx emissions are also reduced beyond that of modern diesels. It's a little early to run out and buy a turn-key setup, but it's not far away. In essence, this system uses a multiport fuel injection setup in the intake manifold of a diesel for the second fuel. The diesel is used for ignition purposes just like a conventional diesel. Where it gets tricky is having 2 fuel systems on the same engine, the ECU has to control both and modulates each in respect to the other, depending on rpm and load needs. For the diesel-heads out there, definitely something to keep your eye on.