- #7229 of 8143
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Re: ... Diesel Design Thoughts [winter2]
by roland3
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Nov 30, 2008 (3:21 am)
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Replying to: winter2 (Nov 29, 2008 5:32 pm)
... Winter, thank you for the links. It might be a case similar to Audi, in that they test above thirty thousand pounds of fuel pressure in their racing program but their street cars run less than thirty thou. So you are right there are some systems that are capable of seven pulses but there are very few that have made it on-highway.
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... What I find even more surprising (and hopefully true) is that one system claims a significant drop in NOx production, especially considering that most attempts at more complete combustion increase NOx. Read, more compression, more boost, more heat, sharper timing. It is one of Mother Nature's CRUEL ironies.
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- #7230 of 8143
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Re: ... Diesel Design Thoughts [gagrice]
by ruking1
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Nov 30, 2008 (8:16 am)
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Replying to: gagrice (Nov 29, 2008 8:03 pm)
This is a tad confusing. Not too long ago Honda went from concept to market for a diesel engine cTDI and transmission/s in not only the shortest time, but with a clean sheet. By all reports it is/remains one of the more sophisticated diesel designs.(tuneable/scale able LOW emissions being one of the HIGHEST priorities)
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- #7231 of 8143
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Re: ... Diesel Design Thoughts [ruking1]
by roland3
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Nov 30, 2008 (9:20 am)
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Replying to: ruking1 (Nov 30, 2008 8:16 am)
... It appears very hard to outdo the "World, Bosch, Common Rail" engine template. I guess Honda might be using Nippon Denso injection. That's one of the reasons that I find Green Diesel Corp's injection so amazing.
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- #7232 of 8143
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Re: ... Diesel Design Thoughts [roland3]
by winter2
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Nov 30, 2008 (9:53 am)
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Replying to: roland3 (Nov 30, 2008 3:21 am)
I get a magazine devoted to diesel and I find that there are Bosch CP3 pumps out there that will deliver 40,000 PSI (2666 Bar) reliably over the long term including the one on my Jeep Liberty CRD. In fact, V.M. Motori, the manufacturer of the engine in my Jeep has a version of my engine with piezo injection.
http://www.vmmotori.it/en/01/00/01/dettaglio.jsp?id=56
It uses the same Bosch CP3 pump at 1600 Bar but delivers 60 more Newton-Meters ( 44.25 lb-ft) of torque over the version I have.
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- #7233 of 8143
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Re: ... Diesel Design Thoughts [roland3]
by ruking1
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Dec 01, 2008 (7:41 am)
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Replying to: roland3 (Nov 30, 2008 9:20 am)
I understand the new 2009 VW Jetta TDI uses one of the newest Bosch CR systems. By all anecdotal reports, there have been no issues or problems.
Naturally a lot of diesel types look to longer time/milegage frames. Since the current Honda diesels do not hit the US market, finding information is a tad on the arcane side from the normal information channels.
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- #7234 of 8143
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Re: ... Diesel Design Thoughts [ruking1]
by alltorque
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Dec 01, 2008 (8:28 am)
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Replying to: ruking1 (Dec 01, 2008 7:41 am)
Does this help at all ?
Honda i-DTEC
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- #7235 of 8143
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Re: ... Diesel Design Thoughts [alltorque]
by ruking1
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Dec 01, 2008 (8:42 am)
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Replying to: alltorque (Dec 01, 2008 8:28 am)
Indeed. However if I understand the article, the ENGINE passed the tests. Done deal! It really totally ignores the recent publicized "automatic transmission failure" issue bru ha ha.
My take is a combination of one respondents take:
"Diesels are expensive, especially four valve, overhead cam, high pressure, direct injection, turbo inter cooler, diesels with a closed loop microcomputer control, cat converter and particulate filter. I think what you are seeing here is the peak of the ICEs. It is becoming more costly to continue to invent complicated tweaking for the ICE than it is to improve the battery and electric drive lines for BEVs. Once BEVs can attain a 70 mph speed for a 350 mile range and be recharged in 10 to 20 minutes, there will be little need for the ICE except for heavy hauling range extensions. "
Actually hybrids and or electrical can cost far more, but IF the plug in electrical can have a range of say 300-500 miles (30 min recharge) a secondary or back up diesel engine would make a GREAT combination !!! You basically can run the diesel engine when you want/have to.
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- #7236 of 8143
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ML 320 Bluetec
by houdini1
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Dec 01, 2008 (1:25 pm)
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About the only thing that Edmunds liked about this SUV was the improved mileage...and that was only 18/24.
They did not like the transmission at all. Very sluggish with a big lag. Steering wheel like a bus, no feedback, and very sloppy. Suspension too soft with huge body roll. Firmer setting on the air suspension just made it jiggly and did not improve body roll. Very disappointing.
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- #7237 of 8143
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Re: ML 320 Bluetec [houdini1]
by ruking1
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Dec 01, 2008 (1:33 pm)
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Replying to: houdini1 (Dec 01, 2008 1:25 pm)
That was what a friend of mine said about her gasser MB ML320 and she is not car techie oriented !! Evidently the TDI didn't improve the platform at all. She would NOT get another! She likes the Acura MDX as long as the hubbie is driving, as it seems a tad too big to her. So far the only one to have done a good diesel/automatic transmission has been MB BUT on the E320/350 (4 door sedan)
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- #7238 of 8143
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Re: ... Diesel Design Thoughts [ruking1]
by roland3
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Dec 02, 2008 (9:36 am)
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Replying to: ruking1 (Dec 01, 2008 8:42 am)
... Ruking, amazing, I was going to start a post with almost the same theory as the respondent. The heading would have been, "It's the Same as Nature". Content: whether it's five years or fifty, the Diesel will become obsolete. Maybe it will be economic forces or legislative encumbrance or a new species altogether, the engine will be like buffalo some day. Rudolf's spawn might run out of grazing fodder (crude oil) also.
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