HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
News
Electronics & Test

'Variable Swirl' Sparks Diesel's American Return

NO RATINGS
View Comments: Threaded|Newest First|Oldest First
rpl3000
User Rank
Gold
Premium Diesel
rpl3000   8/15/2013 8:14:30 AM
NO RATINGS
I think that buyers of "premium diesel" cars will look elsewhere. In the mean time I'm still looking for a replacement for my '02 tdi golf......

Where is my 'cheap diesel'?

Cadman-LT
User Rank
Platinum
Re: Premium Diesel
Cadman-LT   8/15/2013 8:59:18 AM
NO RATINGS
gotta love deisel is all I can say.

Cadman-LT
User Rank
Platinum
Re: Premium Diesel
Cadman-LT   8/15/2013 9:02:30 AM
NO RATINGS
in fact I HATE deisel...but if it does good then ok

Cadman-LT
User Rank
Platinum
Re: Premium Diesel
Cadman-LT   8/15/2013 9:05:16 AM
NO RATINGS
I take that back. I think they have made some decent desiels. Fast ones at that! 

naperlou
User Rank
Blogger
Re: Premium Diesel
naperlou   8/15/2013 9:45:43 AM
NO RATINGS
Many of the diesels in Europe have great performance.  When I took my driver's test in England I had an examiner who was a real gear head (I had been briefed on the two examiners).  So, I got him talking about hot cars.  I didn't have to do half of what is usually required.  One of the cars he liked was a turbo diesel.  He had driven it in Germany on the Autobahn.  They really are much cleaner that diesels of old.

rpl3000
User Rank
Gold
Re: Premium Diesel
rpl3000   8/15/2013 10:33:28 AM
I was just recenlty in Germany and I drove 4 turbo diesel rentals. Hyundai I30, Ford Focus, Merc A-class, and a Ford C-max. They were all pretty awesome. Tons of torque, no turbo lag and they all went 200kph on the autobahn. I have the feeling that the small cars over here are 10 years behind the European offerings. Especially in the wagon and hatch models.

a.saji
User Rank
Silver
Re: Premium Diesel
a.saji   8/16/2013 4:10:01 AM
NO RATINGS
@Cadmen: Yes they have done some good work recently. Yes it is unfair if you say no as an overall result on them.   

GTOlover
User Rank
Platinum
fuel costs in US
GTOlover   8/16/2013 9:03:16 AM
NO RATINGS
So I pull-up to the pump and see diesel is $3.90 a gallon and gasoline is $3.40 a gallon I am pretty sure I am buying gasoline. A diesel that can get 46 mpg is good, but why not buy a gasoline hybrid?

Then we have the whole late 80's early 90's diesel nightmare tarnishing US consumers view of diesel automobiles. I am not sure that the US is ready. They will sell OK as a small share of the diesel car market, but I do not forsee the Cruz overtaking the gasoline version. The diesel costs a little over $25k and the ECO (at 42 mpg) is a little over $21k. May not seem like much, but most consumers will not calculate the difference and go for the cheaper car that uses cheaper fuel.

kodaiflow
User Rank
Bronze
Re: fuel costs in US
kodaiflow   8/16/2013 10:35:02 AM
NO RATINGS
Eventually they will mix the two and break the 100mpg mark.  When you add in Hybrid drive and CVT you take out the problem areas of the rpm T curve and the efficiency goes through the roof.  Diesel idles at near zero fuel consumption so you don't have to keep starting and stoping the engine like a gas engine. 





Dave Palmer
User Rank
Platinum
Re: fuel costs in US
Dave Palmer   8/16/2013 12:50:13 PM
NO RATINGS
High-MPG diesel-electric hybrids were the focus of the Partnership for a New Generation of Vehicles in the 1990s.  Each of the Big Three automakers produced a diesel hybrid that achieved 70 - 80 miles per gallon.  Unfortunately, most U.S. consumers weren't particularly interested in high-MPG vehicles in the late 1990s - early 2000s, and the federal government pulled the plug on the project when the new administration took office in 2001.

Ratsky
User Rank
Platinum
Re: fuel costs in US
Ratsky   8/16/2013 2:03:54 PM
NO RATINGS
GTOLover, I too have been quite impressed with Diesel rentals in Germany, and like you I am leery of the economics here in the US.  In Europe, diesel fuel is considerably CHEAPER than gasoline, the opposite of the situation in the US.  This is greatly influenced by politics; both areas try to burden the commercial user (based on the flawed theory that "they can afford to pay it" not recognizing it's ultimately paid by the consumer), and favor the consumer.  Since diesels predominate in Europe, that fuel is taxed less, and gasoline more.  In the US, with commercial users primarily diesel, and consumers mostly gasoline, the tax/subsidy setup goes the other way.  From my point of view, the better solution is to not use tax structures to "tilt" the market, and let the two fuels compete on a level field.

I do remember the earlier GM diesels; the president of an old employer had a 1980ish Cadillac Seville diesel that he truly loved (why, I have no idea, but he actually paid to have the car completely rebuilt after a disagreement with a large deer at 60MPH).  It spent more time in the shop than on the road... and was recalled several times to boot!

 

Kevin CHRIK4771
User Rank
Iron
Diesel performance
Kevin CHRIK4771   8/16/2013 10:06:36 AM
NO RATINGS
I have been saying it for years, ever since they made the announcement back in 2008ish, when GM was I designing a smaller diesel engine for the medium duty trucks. I think it would have taken of then. People want power, and fuel economy, the diesel power plant brings the best of both worlds.

bob from maine
User Rank
Platinum
American Hype?
bob from maine   8/16/2013 2:37:11 PM
Maybe I am listening too fast. Diesel engines are defined as compression ignition, thus they run 'unthrottled' as described. If you 'throttle' the intake, you reduce the volume of the intake air, thus the combustion chamber pressure goes down and compression ignition becomes difficult. Virtually all small and some larger diesels use a pre-combustion chamber which is where the glow-plug lives and where the fuel is injected, this is required because the smaller engines tend to run lower compression ratios. Common rail fuel systems allow the fuel injectors of a diesel engine to meter fuel into the combustion chamber over a longer period in order to enhance combustion, reduce combustion temperature and noise. My point is "Variable swirl" sounds a great deal like American Hype with little basis in engineering. There have been great strides made in diesel engine technology in recent years with U.S. companies being well represented. I hope this is another one, but based on prior advertising hype I am sceptical.

William K.
User Rank
Platinum
Variable swirl is not just hype.
William K.   8/16/2013 8:06:22 PM
NO RATINGS
Way back, around 1988 or possibly 1989, I designed a swirl meter for a major US automaker. They had discovered some large benefits while doing some experiments with swirl, but they had no means of reading the actual swirl velocity beyond "more" and "less". So I came up with the concept and our company built the device for them and they were quite happy with it. So based on the discussions that we had in those sales meetings there is definitely a benefit in having enough swirl in the combustion area.

The variable swirl implementation makes a lot of sense because producing that much swirl in very large amounts of air is work, which work done in running the engine is not available to drive the vehicle. So the whole concept makes a good deal of sense. So it does not seem like hype.

Leigh
User Rank
Silver
Re: Variable swirl is not just hype.
Leigh   8/18/2013 6:15:39 PM
NO RATINGS
I'm intrigued as to how you measured swirl in such a hostile environment?

William K.
User Rank
Platinum
Re: Variable swirl is not just hype.
William K.   8/18/2013 6:59:45 PM
NO RATINGS
The actual swirl meter package utilized the actual cylinder head, or a solid model, and a cylindrical section below that was the same diameter as the engines cylinder. The sensing was done by measuring the torque produced in a section of "Hexcell" material that was held in place of the piston. The height could be varied in a calibrated and repeatable manner to simulate various piston heights up to TDC. Airflow was delivered by a well calibrated blower system.

IT was not a perfect system, but it was certainly possible to determine exactly how much angular momentum the entering airflow had, which allowed for optimizing the cylinder head profile. We never got called on to make changes, so I never found out how useful it was. BUt their purchase did include a complete set of drawings of all the parts, and the assembly. So there could be a few of those machines around. Most customers did not purchase the drawings and design rights to machines, and we never sold another one to anybody else.

Gorski
User Rank
Platinum
Variable swirl
Gorski   3/21/2014 11:25:44 AM
NO RATINGS
I think diesel engines should be a first priority for auto makers to get high mileage. The new VW boasts of 50+ mpg. This is without plastic cars and large electric batteries. What are they withing for?

Partner Zone
Latest Analysis
Factory floor engineers may soon be able to operate machinery and monitor equipment status simply by tapping their eyeglasses.
GE Aviation not only plans to use 3D printing to mass-produce metal parts for its LEAP jet engine, but it's also developing a separate technology for 3D-printing metal parts used in its other engines.
In this TED presentation, Wayne Cotter, a computer engineer turned standup comic, explains why engineers are natural comedians.
IBM's new SyNAPSE chip makes it possible for computers to both memorize and compute simultaneously.
The “Space Kid,” 11, will be one of the first civilians to have his design manufactured in space by NASA, thanks to the City X Project, which inspires kids to think about new 3D-printed inventions that could be useful for humans living in space.
More:Blogs|News
Design News Webinar Series
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Sep 22 - 26, MCU Software Development – A Step-by-Step Guide (Using a Real Eval Board)
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service