Marc Deluca: Q&a Regarding Cng Injection Systems - Page 4 - Chevy and GMC Duramax Diesel Forum
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Old 01-16-2009, 10:24 AM   eBay Motors  #31 (permalink)
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It takes a certain amount of energy to do a job. If you currently get 20 mpg on #2 only, then your truck uses 7,000 btu/mi since #2 has 140,000 btu/gal. When you use propane or cng, you exchange some of these #2 btus for gas btus. When I get 50 mpg on #2 using the blend, I am still burning 7,000 btus/mi. But now, only 2,800 of them are coming from the #2. The remaining 4,200 are being supplied by cng. So, if a gasoline gallon equivalent of cng is 125,000 btus, then you divide 125,000/4,200 to find the cng mileage, which would be about 29 mpg. When I took a trip last year and got 65 mpg on #2, I got 16 mpg on propane at the same time. No magic act going on, just simple substitution. The savings comes from getting the gas cheaper per btu than the diesel. With propane at 91,000 btus/gal, it has to be less than 2/3 the cost of #2 just to break even. This is why propane is generally too costly nowadays to make the math work.

Regarding melting pistons. If towing, you should have an EGT gauge just as you would with a tuner delivering more #2. You don't get 35% more power without risk. If the egt gets too high, back out of the throttle.

About the lack of lubrication. Spark ignition cng engines wear valves and seats faster because of no lube. A diesel is still using enough diesel with the gas to more than adequately lube the valves and seats. The cylinder walls don't want any diesel fuel on them, because that dilutes the lubricating oil. So, everything will last longer in a gas supplemented diesel engine as long as it isn't overloaded and burned up with high cylinder temps.
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'04 CCLB D/A LLY w/supplemental CNG gas injection, Harvard bypass oil and trans filters
'05 Jeep Liberty diesel w/supplemental CNG
'95 Suburban 4BT Cummins w/supplemental CNG
'72 Impala LPG

marc@delucafuelproducts.com
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Old 05-06-2009, 02:10 PM   eBay Motors  #32 (permalink)
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I want to put CNG on my truck. Would it be safe to put a storage tank underneath the truck, like where a second gas tank could go. Obviously cover it with a 1/4" metal plate for extra protection.
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Old 05-06-2009, 08:59 PM   eBay Motors  #33 (permalink)
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You can do it, but you can only get 4 to 6 GGE underneath. It doesn't lend itself to small spaces.
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'04 CCLB D/A LLY w/supplemental CNG gas injection, Harvard bypass oil and trans filters
'05 Jeep Liberty diesel w/supplemental CNG
'95 Suburban 4BT Cummins w/supplemental CNG
'72 Impala LPG

marc@delucafuelproducts.com
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Old 05-07-2009, 08:25 AM   eBay Motors  #34 (permalink)
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That's what I figured. Thanks for the info!

What exactly is GGE? Is that tank size?
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06' Silverado 2500HD LBZ D-Max
ATS E-Power, ATS transmission MBRP Cat Delete, Banks Monster exhaust, Banks intake, turbo resonator plugged.

88' Chevy K-5 Blazer
350ci/265hp block, Edlebrock Multi-Port FI, Edlebrock 1-7/8" headers, Catco cat and Flowmaster 50 series (single in dual out)
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Old 05-07-2009, 08:19 PM   eBay Motors  #35 (permalink)
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GGE is gasoline gallon equivalent. Is approx 125 cubic feet of natural gas. One GGE has the same amount of energy as one gal of gasoline.
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'04 CCLB D/A LLY w/supplemental CNG gas injection, Harvard bypass oil and trans filters
'05 Jeep Liberty diesel w/supplemental CNG
'95 Suburban 4BT Cummins w/supplemental CNG
'72 Impala LPG

marc@delucafuelproducts.com
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Old 01-03-2011, 01:23 PM   eBay Motors  #36 (permalink)
 
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Question



I'm a total NOOB with diesel and have ended up with more confusion that answers; most likely self induced. The first diesel CNG injection kit that I heard of was from Natruell with a Bully Dog controller; it was in an article in May of 2009, but they have apparently disappeared off the map. The claims purported in the article was something close to a 4 to 1 ratio and that the kit cost could be re-cooped within about 40K miles depending. All for nothing now because they disappeared. If I got it right any CNG kit is going to need to interface with a computer controlled injection system in order to work so an older diesel set up wont work. From what I can tell a full CNG conversion would be for a gasser and not a diesel. So who has a diesel CNG injection kit that isnt a conversion? I'm also interested in a home pumping station so I dont have to hunt around town. Another question is what sources do we have for tanks? I'm doing a full custom build on a 1967 Jeep Gladiator long bed and extending it into a quad cab. I should have plenty of room length-wise and will doing some mods to the frame as well to help tuck the tanks up as high as I can to limit anny hang below the frame. I would really like as much info as you can drop on me. I've fully stepped into something with no return ticket so now I gotta take the bull by the horns and ride it out. Thanks for your time in reading this and I eagerly look forward to your response(s).

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