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i heard of a lot of people running CNG or propane. which is petter for mileage, power, etc? which fuel is cheaper? what is the process for running them in my truck, what do i need? is it worth it?
 

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The tow man
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Moved to Drugs!
 

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Cng

Congrats, Its hard to believe until you do it yourself. At $1.36 it will add up in a hurry. Jeff
 
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i heard of a lot of people running CNG or propane. which is petter for mileage, power, etc? which fuel is cheaper? what is the process for running them in my truck, what do i need? is it worth it?
Those fuels vary widely on their cost and whether or not the local infrastructure even supports automotive CNG. For me, here in the Bluegrass, I ran the numbers and it simply wasn't worth it. But... there are others out where CNG is cheap and easily obtained that are doing very well with it.

Search out Marc Deluca out here in the Propane, Nitrous, & Water Meth section - he sells kits and can tell you all about it. Good luck!
 

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lets see if we can get Banks in here to answer some questions. :cool:


:D
 

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Compressed Natural Gas
 

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Unless you buy propane in huge quantities, it is tough to get it cheap enough to save much anymore. CNG is alot cheaper, but more upfront investment is required. If you have no station near you, you can use a compressor if you heat with natural gas. If you don't have it in your home or a station near by, it isn't even an option.
 

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I heat my home w/NG, how do you get a compressor to fill tanks, and is this leagal?
 

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CNG on 01 LB7

Well Gents... I have gone Bi-Fuel (CNG/Diesel) with Marc DeLuca's kit and it performs. Have a 2001 LB7 2500HD Crew 4x4 SB with 105k ..miles all stock. Have the 1 generation Pullrite Super Glide 5th wheel hitch in back (350lbs). I have a new 21 GGE CNG composite tank installed in the bed (200lbs empty). Air Ride Airbags in the back.

Visited Marc this past labor day weekend to finish the install and do some testing. Got Marc's kit prior and did the install before the trip, but did not hook up. Just hooked everything up when I got to Marc's place and did some road CNG flow adjusting.

Well here is the summary of the return trip home after the weekend with Marc.... (clearly more power, turbo lag is GONE).

- Filled up to the rim on diesel, shaking the truck to get the air out of the tank as I filled as I always do.
- Only could get 3000 psi of possible 3600psi at the CNG station in Marc's town as it is all that it would provide that day.
- Outside temps we 85-90 all the way home.
- AC on full blast all the way (think I need a recharge as I used to freeze after about 1 hour of full AC).

Normally get 19-20 mpg at about 65-70mph with no AC on.

Totals:
- Return trip home was 253.8 miles
- Did get stuck in a traffic jam for about 30 minutes, and made one stop to a town for dinner.
- Diesel Fuel use = 4.07 Gallons (topped off diesel at my usual home station). The Diesel Guage never moved off "over-full reading).
- Diesel Fuel MPG = 62.36
- CNG USE 2500 PSI of 3000 total PSI at start of a 21 GGE tank.
This is where it gets tricky as a GGE is not quite the same as a true liquid gallon, and I did not get a full 3600psi fill in Marc's town to start.
Assuming a CNG use of 14 GGE / 258.3 = 18.45MPG

CNG here in Michigan is $1.95/GGE and Diesel is $4.20.

Still doing some fine tuning this week, and I believe I can get to the 25-30mpg hi-way combined.

My justification, for the CNG install....
I was going to buy a small used 4 banger to commute to work to get better mileage, but when you factor in the cost of a used small car, the insurance, the maintence on it, state plate fees, and the sheer fact I LIKE MY TRUCK AND LOVE TO DRIVE IT, and I tow a 14000lbs 5th wheel and still want to go on trips without breaking the bank..the math became simple for me....this is all I needed. Getting the 75-100 extra HP, no more turbo lag, and 100-200 more fbt.... Bonus ! I was going to get a bed diesel 2nd tank anyway... and I got a tank... just not a diesel one.
 

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Hello Louie, Glad to see you are trying Marc's kit. It it amazing what that simple little kit will do. I still smile everytime I think about my first trip with Marc and the look on my face when I filled it back up. I think Marc's kit is the best unkeeped secret out there. Jeff
 

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LMM compatable???

With all of the new sensors and computers in the LMM, will dumping CNG or propane into the engine throw codes? I'd like to invest in this system, but not at the risk running non-stock tunes and programers to clear codes. Seems like running CNG/propane with B100 would fix the DPF regen issue of inadaquate EGT as well.
 

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My system has been installed on quite a few LMMs w/o any problems. Also some 6.4 Fords and 6.7 Dodges.
 

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No, it doesn't work on naturally aspirated diesels in vehicles. It will work okay on stationary engines that are constant rpm.
 

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No, it doesn't work on naturally aspirated diesels in vehicles. It will work okay on stationary engines that are constant rpm.
Marc, do you use the kind of regulators the forklifts use, because I think it can be used on n/a engines as well.

Here in Europe LPG is mainly used in gassers and most of them are n/a though they can achieve higher vacuum due to the throttle.

I guess you can overcome this problem by maxing out the regulator. On my regulator I can change the pressure of the lpg and the strength of the diaphragm's spring. I can increase the lpg flow by maxing out the pressure and making the spring weaker. I also have an "adjuster" inline with the lpg hose that goes into the intake. YOu can max that out as well, or if you're using an orifice have a larger hole.
 

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The problem is that with a naturally aspirated diesel, the airflow is rpm dependent, not load dependent. This makes it difficult to deliver enough gas at heavy load w/o overloading it at light load. It can be done, but you need to use a throttle valve on the vapor line. I haven't bothered to do it because there are so few vehicles that are n/a anymore.
 
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Man... if the CNG infrastructure was around here, I'd be on this like ugly on a dog. Maybe someday.
 
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