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wheelinyj
Bone Stock
Posts:8
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| 07/29/2009 11:04 PM |
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i am in the market for getting a truck and i have heard nightmares about the new emissions for diesels in general. i was wondering if anyone with these engines could post problems with them and mileage and such? |
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IndyToy
Bone Stock
Posts:46
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| 08/02/2009 9:16 PM |
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| i can tell you this much. My cummins was before the new non smoke and BS emmisions that are on the new trucks and it gets 22+ mpg. The new dodge trucks that i looked at were only getting 14mpg. But thats dodge dont know about the chevys you would have to ask webby. |
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MIDWEST4X4.US |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 08/03/2009 9:12 AM |
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I just sold my '05 Duramax in favor of a gas-sipping, 26mpg Silverado with the 6.0 Liter/Active Fuel Management with the Max Trailering package. I've been a big fan of diesels for years, but I have to tell you... I reallllly like the new 6.0 liter gas engine. 
Anyhow, back to your question... I've driven a few of the new '09 Diesels and they seemed to have as much power (seats of the pants feeling) as my '05 truck.. Pulled well, had gobs of power, etc.
As far as the new federal standards goes, GM didn't add too much in the way of power-robbing / complex emissions systems to the Duramax, but it may be indeed the last generation of the 6.6 L TDs (same for Ford and Dodge, for that matter - but that's pure speculation). Here's what they've added...
- New Boreless Turbo - designed to handle 120,000+ rpm variable vane turbo speeds
- New Injectors - All-new, solenoid-controlled, seven-hole injectors improve combustion. ULSD-safe injectors improves atomization of fuel and lower emissions and noise through the use of multiple injection events during a single combustion stroke. These customized injections will also be occasionally used to increase the exhaust temperature to clean out the diesel particulate filter.
- Intake Throttle Added - An electronically-controlled intake throttle upstream from the turbocharger. While the engine is idling or the truck is traveling at low speeds with no load, the engine computer will limit the amount of air allowed to enter the engine to intensify the load. This increases the exhaust temp, which lowers emissions.
- Larger EGR Cooler - Helps reduce NO2 emissions, and its larger heat exchanger is bigger than the the LBZ EGRs.
- Closed Crankcase Ventilation - Further reduces NO2 emissions. The LMM engine has a sealed chamber between the cylinder banks to ensure crankcase gasses are held within the engine.
- Diesel Particulate Filter - A "regenerating" diesel particulate filter will scrub exhaust gasses and trap particles before they are allowed to exit the tailpipe.
- New Electrically Controlled Fan - Will be cooled by a fan that is electrically controlled by big honkin'computer, which more precisely controls engine temps, increases efficiency, reduces emissions, etc.
- Computerized Oil Life System - To meet emissions requirements and prevent the DPF from clogging, the LMM requires the use of CJ-4 compliant low-ash oil. The amount of time between oil changes is up to the engine computer and the computerized "Oil Life System."
Anyhow, most of these changes are indeed for the good, and most don't rob the LMM engine of power. It will be more complex than previous models and will likely have an increased percentage of time in the service bay, but I couldn't find any data to support that (another hunch of mine). Just be sure to get a warranty on the drivetrain if you're buying a used vehicle!
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
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'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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