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6.7L Upgrades and Aftermarket - Engine Upgrading or adding OEM or aftermarket equipment to your 2011-Up Super Duty truck with 6.7L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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Old 02-20-2013, 11:38 PM   #1 (permalink)
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6.7L on natural gas conversion

has any one seen theses kits,my local city has converted a new 6,7to natural gas and he told me it was a beast.it went from 14mpg to 30mpg on natural gas.it must be pretty good thing.cause they are planning on converting every vehicle in there fleet.does anybody know anything about this?
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Old 02-21-2013, 06:15 AM   #2 (permalink)
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I have a buddy who does these conversions on smaller F150s and Ranger fleet trucks. He says it becomes profitable for the companies if they put on 30k miles a year or more, and have a 50% tax credit. Also you need to have a decent area for natural gas pumps. The storage tank is pretty big as well.
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Old 02-21-2013, 07:44 AM   #3 (permalink)
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You sure it was a 6.7 and not a 6.2 gasser? I've only heard of it being done to the 6.2. I wouldn't think it'd be possible on a 6.7 unless it was just a fuel supplement like propane.

Natural gas has a lot less energy than gasoline so I wouldn't believe the 30mpg claim. That may just be a cost equivalent.
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Old 02-21-2013, 01:45 PM   #4 (permalink)
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it is the 6.7.i seen it with my own eyes.they also have a f650 diesel that they have put it on also.
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Old 02-21-2013, 02:19 PM   #5 (permalink)
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Quote:
Originally Posted by 12superduty View Post
has any one seen theses kits,my local city has converted a new 6,7to natural gas and he told me it was a beast.it went from 14mpg to 30mpg on natural gas.it must be pretty good thing.cause they are planning on converting every vehicle in there fleet.does anybody know anything about this?
when you say "14mpg to 30mpg" I assume you mean the equivalent of 30mpg since natural gas is not measured in gallons.

either way.... I doubt 30mpg equivalent.
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Old 03-01-2013, 12:03 PM   #6 (permalink)
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GGE- Gas Gallon Equivalent.


GGE Calculated for Gasoline in US Gallons at 114000 BTU per Gallon

Fuel - Liquid, US Gallons GGE GGE % BTU/Gal
Gasoline (base)[3] 1.0000 100.00% 114,000
Diesel #2[5] 0.8800 113.64% 129,500
Biodiesel (B100)[5] 0.9600 104.17% 118,300
Bio Diesel (B20)[5] 0.9000 111.11% 127,250
Liq natural gas (LNG)[5] 1.5362 65.10% 75,000
Liq petroleum gas(LPG)[5] 1.3500 74.04% 84,300

GGE calculated on Non-Liquid Fuels

Fuel - Non Liquid GGE GGE % BTU/unit
Gasoline (base)[3] 1.0000 100.00% 114,000 BTU/gal
Comp nat gas(CNG)[5] 126.67 cu ft 114,003 BTU/126.67 cu ft

(####s pulled from Wikipedia, so I cannot attest to their accuracy.)

Gasoline engines can run dedicated CNG, diesel engines must run dual fuel to achieve ignition. Normal ratios are anywhere from 20%D80%CNG to 35%D65%CNG.

The only problem with the CNG conversion is the DEF and emission systems. While on CNG, DEF is consumed at twice the rate compared to 100% diesel. For the dual fuel system to function properly, the DEF must be turned off with a tuner, which voids warranty. (I have spoken with a Service Manager of a stealership who said he has already converted his 6.7 Scorpion to DNG. I did not see it with my own eyes. I guess he would be the one to make the call on warranty work, so he is in the clear? To back up 12superduty, the Service Manager also claimed a jump in MPG from 20mpg on deisel to 37mpg on DNG. The DNG conversion company I am using is also claiming similar number on their,already converted, 6.6 Duramax[s] and 6.7 Cummins.) Note: I may have gotten the size of the Cummins wrong. I do know it is a Cummins pre-DEF, so it may not be the 6.7. I am not a Dodge guy.

I have heard talks of increased horsepower and torque along with the increased MPG on DNG. I am skeptical. We shall see soon.

Regarding the warranty: The conversion company I am using has a petition in with the EPA and Ford. If the EPA says its cool to circumvent the DEF and emissions systems, Ford will allow conversions on their diesels without voiding the warranty. The EPA needs to be convinced DNG burns cleaner then diesel. (So I am told by the conversion company owner.)

Regarding the MPG increases: There are some funny numbers floating around. There are different ways to extrapolate the MPG, similar to differing account methods. I just hope the MPG increase numbers are not coming from accounting methods similar to what our federal government uses, if you know what I mean.

Last edited by GAZ69OK; 03-01-2013 at 12:12 PM. Reason: glaring grammatical errors
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Old 03-01-2013, 03:11 PM   #7 (permalink)
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So nobody has a name of this conversion company? Website?
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Old 03-15-2013, 10:32 AM   #8 (permalink)
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Air stumbled upon this thread. I run CNG on my 7.3. It is not a true conversion, you are still running some diesel and not straight natural gas.....you don't have a spark plug. I regularly get over 30mpg's on the diesel and 16-20 on the CNG. The reason it is a beast is because you are adding more fuel when you really step on it. I would think you would use less DEF because the CNG burns cleaner and you are using less diesel. My oil stays cleaner longer by way of blackstone analysis. I love the system on my 7.3 and have thought about doing it to my wife's 6.7.
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Old 05-25-2015, 01:31 PM   #9 (permalink)
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Regarding the warranty: The conversion company I am using has a petition in with the EPA and Ford. If the EPA says its cool to circumvent the DEF and emissions systems, Ford will allow conversions on their diesels without voiding the warranty. The EPA needs to be convinced DNG burns cleaner then diesel. (So I am told by the conversion company owner.)
Any new info on this? I'd like to put one on my new 6.7 but ain't gonna happen if the warranty is voided.
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Old 05-25-2015, 05:16 PM   #10 (permalink)
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Of course it will void your warranty.
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Old 05-25-2015, 05:32 PM   #11 (permalink)
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I was talking to the fleet manager of the Ford dealer I use and he's talking about doing the cng/diesel conversion soon. They've been doing cng conversions on gas trucks for several years now, not as often now because gasoline prices are down. He wouldn't be doing these conversions if it voided the warranty.
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Old 05-25-2015, 06:03 PM   #12 (permalink)
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Trust me, if you roll into Ford with that you are not getting warranty.
Lots of people make and install products that void warranty, so I'm not exactly why you say that.
I'm not sure exactly how you would convert it. I believe there is mass confusion here.
You can supplement a diesel with gas but a complete conversion? Where does the compression ratio get changed? Where is the ignition system? Where you putting spark plugs. Where are you mounting the fuel delivery system?

Last edited by Maryland dieselnick; 05-26-2015 at 05:05 PM.
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Old 05-25-2015, 06:43 PM   #13 (permalink)
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Gaseous fuel operation of diesels has been going on for decades. Many cities do it with all city buses as it is clean and does away with the complaints of diesel exhaust odor.
It is getting hugely popular to use reclaimed methane from landfills and then using a compressor station to get enough into a tank of packageable size for refuse trucks.
The fuel system is adapted to deliver a very low amount of diesel fuel and the diesel combustion is the spark plug so to speak. The gaseous fuel will not burn until there is spark or other ignition source. ( I use "gaseous fuel" to mean CNG, LNG, Propane, butane, and a few other gases that can be derived from crude refinining or from organic distilling) For high load the amount of diesel is increased but nowhere near the full amount as for diesel only operation. As mentioned already the engine oil is VERY slow to get darkened since so little diesel is used and the gaseous fuel does not dirty the oil at all since it burns clean and leaves nothing to wiped off cylinder walls into oil.
What is being discussed here is not related to the performance mod of taking an untouched fuel system and just adding propane.
UPS recently bumped up the number they run on CNG.
The conversion is like the one done to gasoline engines where an air flow gas metering device is used. Diesels need a throttle but with late model diesels many now have a throttle.

This topic is relatively unknown but has been around for a long time. There was a limited amount of farm waste distilling used for motor fuel in WWII here but it was more common in Europe. I saw a museum display of a Volvo in Sweden with a wood chip distiller rig on a platform mounted on rear of car. Here is an article about with some photos: LOW-TECH MAGAZINE: Wood gas vehicles: firewood in the fuel tank
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Old 05-26-2015, 09:27 AM   #14 (permalink)
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Gaseous fuel operation of diesels has been going on for decades. Many cities do it with all city buses as it is clean and does away with the complaints of diesel exhaust odor.
Yep. If they have the gasoline models they're offering as CNG ready, than why can't they allow for the diesels as well? From what I hear, it's the best of both worlds....cleaner burning, less diesel, and no decrease in performance (in fact, it seems it's MORE powerful after the fact).
But.....I'm not sure about the warranty on the gasoline models as Ford doesn't install the CNG systems on them either, just the prep package.

I tried looking for a CNG prepped model where I'm at but couldn't find one and I need a truck ASAP as I have to do some trailering soon. Couldn't wait for them to find me one.

My real interest in all this is I'm a NG producer.

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Old 06-13-2015, 09:55 AM   #15 (permalink)
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There is a lot of stuff on Google....
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