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 > Mercedes MBE 926 Engine - Opinions? MPG?

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wolfe10

Texas

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Posted: 02/18/08 07:13pm Link  |  Print  |  Notify Moderator

BerkshireVille wrote:

From what I have read the new motors need more displacement and burn more fuel to achieve equivalent HP numbers.


As I posted above, this is NOT the case at Caterpillar-- FACT, not opinion.

For 2007, the C7 (same displacment as the MB engine being discussed): MPG is up 4%, displacment is the same (7.2 liters), HP is up (360 vs 350) and Torque is up quite a bit (925 vs 860).


Brett Wolfe
2003 Alpine 38'


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SteveRankin

Sequim, WA

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Posted: 02/18/08 07:22pm Link  |  Print  |  Notify Moderator

BerkshireVille wrote:

. . . but if you're getting less MPG and burning more fuel i just wonder how much less pollution you are creating . . .


The engine & vehicle manufacturers have been able to duck the TOTAL emissions issue because the EPA doesn't target CO2. That appears to be changing, so a more honest and complete emissions picture as well as fuel economy picture may become available in the future.

In the meant time, the diesel engine manufacturers have all pumped up the HP slightly (perhaps 5%) and made lots of hype out of that, but completely ignored the other facts like engine heat & fuel consumption. Previous generations of diesel emissions changes and corresponding HP increases resulted in significant loss of fuel economy in pickups. I've seen reports of the new engines getting the kind of fuel economy running an empty truck that the pre-2002 engines got pulling a trailer.

Technology is not a silver bullet they would like us to believe it is. Once again, there's no free lunch.


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BerkshireVille

Burlington Ontario Canada

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Posted: 02/19/08 04:00pm Link  |  Print  |  Notify Moderator

Brett,
I agree, Cat is building great motors, I was referring to the optional motors offered in the Berkshire. The MBE is rated at 330 HP and 1,000 pound feet of torque at 1600 rpm, a quote from the 2007 brochure (seems rather optimistic, 860 is listed on the Detroit Diesel site) it was the optional upgrade for 2007.

For 2008 they dropped the MBE (emission requirements I assume?) and offer an ISB 350, 750 pound feet of torque at 1800 rpm. Less torque at higher rpm from a motor making more HP. I have no idea how practical the numbers are, ie cruising speeds vs rpm, usable torque vs max on the curve. I guess my more HP comment was wrong, I should have said the new motors are running higher rpm to achieve less torque and MAY be burning more fuel.

Adam.


2007 Berkshire 360QS MBE 926
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trop-a-cal

Palm Coast Fl

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Posted: 02/20/08 10:54am Link  |  Print  |  Notify Moderator

I think the European Diesel will be 10 PPM v USA 15 PPM in the near future. The cetane rating in USA is 60-65 for ULSD. The analysis done in studies showed that anything below 15 PPM dropped MPG thus increased pollution. MBE has CAFE approved set up for sedans and SUV's tied to 7 speed transmissions. The new big MB diesel probably will meet the USA and European standards. That would make the USA standard 15 PPM vehicles not up to European standards, which may keep them being imported just as the current European approved diesels are not allow to be imported to USA. Hope they get one standard and stop the specification differences. Can't remember what the cetane ratings will be for the new European Diesel. Many using ULSD are putting in additives for increased MPG's.

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