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Gap in fuel efficiency and torque between diesel and gasoline engines is dwindling

Diesel engines are very popular around the world, and are used in both passenger and commercial vehicles due to their efficiency advantages over gasoline engines. In the U.S. passenger vehicle market, they’re largely relegated to heavy-duty pickup trucks (although companies like Volkswagen have maintained a diesel engine lineup for a few decades). 
 
However, diesel fuel averages roughly $0.36 a gallon more than regular unleaded gasoline in the U.S., which can erase some of the cost advantage.

While many diesel-powered vehicles do have better fuel economy than comparable gasoline vehicles, even that benefit is beginning to disappear. In spite of this, many automakers are preparing to launch diesel-powered cars in the U.S., including GM, Chrysler, and Mazda.


Volkswagen Passat TDI

Detroit News reports that diesel engines in cars no longer have a major advantage in torque and they don't offer significantly better fuel economy. Technology for traditional gasoline engines is improving and the gap in fuel efficiency and torque has vanished due to the proliferation of direct injection and turbocharging.

With this in mind, Ford, Toyota, and Hyundai are staying out of the diesel-powered car market; instead focusing hybrid technology. Hyundai Motor America CEO John Krafcik says that the cost of adding hybrid technology for the consumers about $1,500 compared to a cost of about $5,000 to add diesel power.
 
"When we ask if consumers are willing to pay that, they ask, 'What are you smoking?'" said Krafcik. "We all have great diesel engines available to us, but gasoline engines are growing."
 
However, Ford says that it is ready to begin offering diesel-powered cars in the U.S. if there is enough consumer demand

Source: Detroit News



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RE: Modern Diesel Engines are fantastic....
By drewsup on 4/3/2013 11:42:09 AM , Rating: 0
Lets not forget... diesels a LOT fewer parts than a petrol engine, and while the few parts they have are heavily engineered, they last WAYYYYYYY longer than petrol parts do.

P.S. My 12 year old Bora 1.9TDI,goes like stink, 170,000 miles, just getting broken in :D


RE: Modern Diesel Engines are fantastic....
By fishman on 4/3/2013 12:04:09 PM , Rating: 2
Gas engines last a long time, too. My car has 221,000 miles, and it uses a quart of oil every 3000 miles. Engines (both gas and diesel) can last a very long time - it's usually the other items that end up needing replacement.


RE: Modern Diesel Engines are fantastic....
By GotThumbs on 4/3/2013 12:17:04 PM , Rating: 2
quote:
and it uses a quart of oil every 3000 miles


Your valves or piston rings are shot. You must leave a puff of smoke as you leave every stop-light.

So factor in the additional pollution you're contributing and the cost of a quart of oil to your "fuel" costs. Just because you have over 220,000 miles, does not mean your car does NOT need a rebuild.

Diesel engines have tighter precision and my cummings has a rebuild estimate of 300,000+. I have 134,000 currently and do NOT have to add oil to the engine between oil changes (every 7,000 miles with no heavy hauling).

I believe diesel engines are a more expensive option in the US, simply because its still a small % of buyers who choose the option. Dealers WILL take every oportunity to maximize thier profits....and those really interested in a diesel engine ARE willing to pay more for it.

As with hybrids...economies of scale applies to diesel engines as well.

Best wishes,


By FITCamaro on 4/3/2013 2:46:31 PM , Rating: 2
It's also that a lot of diesel vehicles are only sold in the highest trims.


By sorry dog on 4/3/2013 3:10:59 PM , Rating: 3
quote:
You must leave a puff of smoke as you leave every stop-light. So factor in the additional pollution you're contributing and the cost of a quart of oil to your "fuel" costs. Just because you have over 220,000 miles, does not mean your car does NOT need a rebuild.


That's a big exaggeration.

Assuming an average of 40mph and 2500 rpm for average motor speed...

Means it took 4500 minutes for 3000 miles and 5,625,000 power cycles.

And converting to cc's for measurement's sake....

945 cc's in a quart... 945/5625000 = .000168 of a cc per power stroke or .0035th of a cc per second.

so....yeah....let's throw him in jail for gross pollution.


RE: Modern Diesel Engines are fantastic....
By Samus on 4/3/2013 10:17:26 PM , Rating: 1
Dude I totally agree... I laugh my ass off every time someone says "engine only uses 1 quart between changes"

That's hella terrible. No engine should have measurable change in oil capacity, even at 10,000+ miles without an oil change. If you are losing oil, it's either leaking or burning, and both are signs of a problem. It isn't broken in, it's broken. You have likely lost oil pressure somewhere due to a leak or increased friction/load, which results in lost power and efficiency.

It's also very bad for the environment.

If its leaking, it's getting into the water supply. And we're not talking BP oil spill oil, this oil that's leaking contains hundreds of carcinogens from hundreds of different chemicals and their byproducts of combustion.

If its burning oil, it also contains carcinogens, and they are not only getting into the water supply, but the air people and plants breath.

It's completely irresponsible. If it is ever found out someone knowingly continued to drive a car that leaked or burned oil without fixing it, they should have their car booted until they fix it.


By sorry dog on 4/3/2013 11:35:15 PM , Rating: 3
Your being sarcastic right?

If not, were the hell are you people getting these ideas? Lost oil pressure? The engine uses 1 drop of oil in a minute and it's time to rebuild it, right?

Hell, some folks used to mix 100:1 2 stroke in their RX7's to help the apex seals.

At least in slightly older designs, a small amount of oil usage is completely normal. Something as small as a particle of carbon stuck on a EGR valve o-ring could cause that usage...


RE: Modern Diesel Engines are fantastic....
By Spuke on 4/3/2013 4:24:51 PM , Rating: 3
quote:
diesels a LOT fewer parts than a petrol engine
Which parts would those be?


By Samus on 4/3/2013 10:20:23 PM , Rating: 1
Are you kidding? Start with an entire ignition system...


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