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Old 02-20-2009, 06:43 PM   #21 (permalink)
jdugie123
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looks good
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Old 03-10-2009, 12:09 PM   #22 (permalink)
Louie3550
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CNG "withdrawls" when you run out

Been watching the posts on WMI and can't help but wonder if it is worth it verses running Marc's CNG system. Adding the cost of the WMI kit, pulling the engine apart, having to buy "pure" water from the store at ...what ... $2 or so a gallon, then if you "blend your own" and buy the Meth by the drum.. or get washer fluid from Wally World at a bit more ....etc...

Been running CNG since Sept 2008 and could not be happier. I guess I am lucky that I have a public CNG Station a mile from where I work. Even with CNG at $1.95/GGE and Diesel at $1.95 - $2.09 here in Michigan, it is still worth the cost of going CNG. Basically a one-week-end install for the CNG Tank and Kit, nothing to maintain after, just fill-up and go. The extra power, cleaner oil, smooth running, great operation in the winter.....

One thing I did not notice until recently when I ran out of CNG, ... How much quieter the "already quiet" Duramax runs on CNG. Have only run out of CNG 2 times now since Sept 2008 (I kind of go through "withdrawls" when I run out and want to get the CNG re-filled ASAP... kind of like running out of nitrous on my 69 camaro).

Looking at getting the "better half" something Diesel (Benz Diesel SUV or if GM makes it and comes out with rumored Caddy CTS Diesel, or the Jeep Diesel), then I can justify a home CNG Fill unit.
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Old 03-10-2009, 12:11 PM   #23 (permalink)
Louie3550
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Guess I need to work on my picture editing to get them small enough to upload, yet get the whole picture in the frame.... Will try again...
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Old 03-10-2009, 12:58 PM   #24 (permalink)
chevyinlinesix
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So you guys run CNG in your Duramax's?

Think I can get my 6.5 diesel to run on it? I have a CNG setup off my '87 GMC that came from the dealer brand new with it installed.
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Old 03-11-2009, 11:12 AM   #25 (permalink)
Louie3550
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Chevyinlinesix ... Marc Deluca's system is a "bi-fuel system" that requires both fuels (Diesel and CNG) to run. Its a "fumigation" system that draws the CNG in before the Turbo. In Short, as RPMs go up, CNG as a percent of total fuel use goes up (and vice versa as RPMs go down). Marc's CNG system needs at least some diesel burning to "fire" the CNG. Most of the "dealer" CNG systems were "either - or" (Gasoline "or" CNG). None I have seen for Diesel "or" CNG. Diesels have "glow plugs" to "fire" the fuel, and the "or" systems use Spark Plugs.

If you wanted to convert to "only" CNG for your 6.5, I beleive your used dealer system could work, you will likely have to also convert the Diesel to a spark plug ignition system. I beleive the 6.5 motor has the compression ratio and heads to run only CNG.... but with the limited amount of CNG Stations out there, dont run out of CNG or your stuck.

With the bi-fuel, if you run out of CNG, so what... you just run pure diesel and the DMax Computer system adapts back automaticly... until you can get a re-fill of CNG.
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Old 03-11-2009, 11:47 AM   #26 (permalink)
chevyinlinesix
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I see now, sounds relatively simple. I may look into one of these setups, I believe there is two CNG fueling stations where I live, or I could just get a large tank filled, and fill my own. Thanks for the info.
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1996 Chevy Silverado 2500HD, RC LB, 4x4, 14 bolt FF 3.73 posi, Suncoast 4L80E, completely custom engine, true dual 4" exhaust
1987 GMC Sierra 1500HD, RC LB, 12 bolt 3.08 posi, built 383 stroker, TH400, 13" towing converter, 26mpg highway, 22 city, daily driver/drag truck. Swapping in a built TT Duramax/Allison. Looking for about 700RWHP
1995 Chevy 3500HD, RC, DRW, 13' for looong box, Dana 80 4.63 gears, double framed, 15,000 GVWR
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Old 03-11-2009, 12:10 PM   #27 (permalink)
marcdeluca
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The 6.5 will do fine on dual fuel cng. When my 6.5 was running propane, it would get 30 mpg on diesel while getting 29 mpg on lp. CNG is better, because it has a higher octane rating and resists detonation more than lp. One company called Omnitek does spark ignition conversions of diesels, but I wouldn't recommend it.
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Old 03-11-2009, 12:13 PM   #28 (permalink)
chevyinlinesix
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I guess now I have to look into getting the system re-certified, at least now I know it can be done.
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2001 GMC Sierra 2500HD, EC LB, 2WD, Duramax, 30mpg highway.
1996 Chevy Silverado 2500HD, RC LB, 4x4, 14 bolt FF 3.73 posi, Suncoast 4L80E, completely custom engine, true dual 4" exhaust
1987 GMC Sierra 1500HD, RC LB, 12 bolt 3.08 posi, built 383 stroker, TH400, 13" towing converter, 26mpg highway, 22 city, daily driver/drag truck. Swapping in a built TT Duramax/Allison. Looking for about 700RWHP
1995 Chevy 3500HD, RC, DRW, 13' for looong box, Dana 80 4.63 gears, double framed, 15,000 GVWR
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Originally Posted by bodis22
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Old 03-11-2009, 12:19 PM   #29 (permalink)
marcdeluca
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What is involved in certification?
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2004.5 LLY K2500HD CCLB D/A supplemental CNG, Harvard engine & trans bypass filters, Tough Country front end
2012 VW Passat TDI, will one day have CNG injection
1995 C2500 'burb w/CNG injection, 4BT Cummins, 4L80-E trans
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Old 03-11-2009, 12:29 PM   #30 (permalink)
chevyinlinesix
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I don't know exactly, all I know is when I bought the truck the guy told me that the CNG system would need to be re-certified before I could use it, legally.
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2001 GMC Sierra 2500HD, EC LB, 2WD, Duramax, 30mpg highway.
1996 Chevy Silverado 2500HD, RC LB, 4x4, 14 bolt FF 3.73 posi, Suncoast 4L80E, completely custom engine, true dual 4" exhaust
1987 GMC Sierra 1500HD, RC LB, 12 bolt 3.08 posi, built 383 stroker, TH400, 13" towing converter, 26mpg highway, 22 city, daily driver/drag truck. Swapping in a built TT Duramax/Allison. Looking for about 700RWHP
1995 Chevy 3500HD, RC, DRW, 13' for looong box, Dana 80 4.63 gears, double framed, 15,000 GVWR
Member #11 of the TLFTN club, ECLB Member #1
WWW.DMAXSTORE.COM
Quote:
Originally Posted by bodis22
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Last edited by chevyinlinesix; 03-11-2009 at 12:29 PM.
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