Image Gallery: Diesel Engines Despite being more efficient, diesel Engines are more expensive and produce more smoke than gasoline engines. See more diesel engine pictures. Kim Steele/Getty Images Diesel engines have never really caught on in passenger cars. During the late 1970's, diesel engines in passenger cars did see a surge in sales because of the OPEC oil embargo (over half a million were sold in the U.S.), but that is the only significant penetration that diesel engines have made in the marketplace. Even though they are more efficient, there are eight historical problems that have held diesel engines back: Diesel engines, because they have much higher compression ratios (20:1 for a typical diesel vs. 8:1 for a typical gasoline engine), tend to be heavier than an equivalent gasoline engine.Diesel engines also tend to be more expensive.Diesel engines, because of the weight and compression ratio, tend to have lower maximum RPM ranges than gasoline engines (see Question 381 … [Read more...] about If diesel engines are more efficient why do most cars have gasoline engines?
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Image Gallery: Off-roading Civilian or commercial Humvees can navigate through 36 inches of water without a problem. See more off-roading pictures. Jose Azel/Aurora/Getty Images You sometimes see military vehicles running in "extreme" conditions, and these conditions can include deep submersion during river fording. Creating a vehicle that can run submerged is a challenge -- In order for any type of combustion engine to run it must have a source of air, and it must be able to release exhaust gasses. If the water is not too deep (a few feet), the exhaust gases can take care of themselves because they are under pressure. The air intake is usually the problem -- as soon as you submerge the air intake, the engine can no longer get air and it will stop running. You can get around the air intake problem by adding a snorkel. Military Humvees often have a snorkel attached, and it allows them to submerge in up to 5 feet (1.6 meters) of water (see this page for some nice pictures of a … [Read more...] about Is it true that a diesel engine can operate under water while a gasoline engine cannot?
When you hear the word "diesel" you probably imagine something along the lines of a Mack truck. But what do powerful diesel engines actually look like? Check out this image gallery to see the cutting-edge diesel engines in development today. TORU YAMANAKA/AFP/Getty Images The new 2.0 dCi "M9R" 2-litre diesel engine co-developed by Renault and Nissan. This engine is the most efficient in its category. See what could be powering future GM vehicles in the next photo. Doug Benz/General Motors via Getty Images This is GM's 4.5-liter V-8 Duramax diesel engine designed for vehicles like the Chevy Silverado and Hummer H2. Take another look at the Duramax engine on the next page. The 4.5-liter V-8 Duramax improves fuel efficiency by 25 percent when compared with gasoline engines, while reducing pollutants and emissions. The diesel engine on the next page belongs to a vehicle that isn't sold in the U.S. MEHDI FEDOUACH/AFP/Getty Images The … [Read more...] about Diesel Engine Pictures
The 4.5-liter V-8 Duramax improves efficiency by 25 percent when compared with gasoline engines, while reducing pollutants and emissions. See more diesel engine pictures. 2008 HowStuffWorks One of the most popular HowStuffWorks articles is How Car Engines Work, which explains the basic principles behind internal combustion, discusses the four-stroke cycle and talks about all of the subsystems that help your car's engine to do its job. For a long time after we published that article, one of the most common questions asked (and one of the most frequent suggestions made in the suggestion box) was, "What is the difference between a gasoline and a diesel engine?" Diesel's story actually begins with the invention of the gasoline engine. Nikolaus August Otto had invented and patented the gasoline engine by 1876. This invention used the four-stroke combustion principle, also known as the "Otto Cycle," and it's the basic premise for most car engines today. In its early stage, … [Read more...] about How Diesel Engines Work
You can opt for a clean-diesel engine in the Volkswagen Jetta SportWagen. But do your diesel-powered savings plans actually add up? (Courtesy of Volkswagen of America. Inc.) Nothing makes you feel more broke than a trip to the gas station. You have to stand there watching the numbers flick by, going up and up and up. You start daydreaming of those clean diesel cars, the ones that get around 40 miles per gallon (17 kilometers per liter). Sure, they cost a little more, but in your daydream, you'd make up the difference with the savings on fuel. Good idea, right? Well let's find out if your daydreams have any truth in them. As an example, let's have a look at the 2014 VW Jetta SportWagen since it comes in both gasoline and clean diesel versions that are nearly identical -- except for the engine, of course. The basic gas model sells for $20,795, and the diesel is listed at $26,250, a difference of $5,455. But can going a little farther on a tank of gas really make up more than … [Read more...] about Does a diesel engine equal fuel cost savings?