Home
In this issue

Jonathan Tobin: Defending the Right to a Jewish State

Heather Hale: Compliment your kids without giving them big heads

Megan Shauri: 10 ways you are ruining your own happiness

Carolyn Bigda: 8 Best Dividend Stocks for 2015

Kiplinger's Personal Finance editors: 7 Things You Didn't Know About Paying Off Student Loans

Samantha Olson: The Crucial Mistake 55% Of Parents Are Making At Their Baby's Bedtime

Densie Well, Ph.D., R.D. Open your eyes to yellow vegetables

The Kosher Gourmet by Megan Gordon With its colorful cache of purples and oranges and reds, COLLARD GREEN SLAW is a marvelous mood booster --- not to mention just downright delish
April 18, 2014

Rabbi Yonason Goldson: Clarifying one of the greatest philosophical conundrums in theology

Caroline B. Glick: The disappearance of US will

Megan Wallgren: 10 things I've learned from my teenagers

Lizette Borreli: Green Tea Boosts Brain Power, May Help Treat Dementia

John Ericson: Trying hard to be 'positive' but never succeeding? Blame Your Brain

The Kosher Gourmet by Julie Rothman Almondy, flourless torta del re (Italian king's cake), has royal roots, is simple to make, . . . but devour it because it's simply delicious

April 14, 2014

Rabbi Dr Naftali Brawer: Passover frees us from the tyranny of time

Greg Crosby: Passing Over Religion

Eric Schulzke: First degree: How America really recovered from a murder epidemic

Georgia Lee: When love is not enough: Teaching your kids about the realities of adult relationships

Cameron Huddleston: Freebies for Your Lawn and Garden

Gordon Pape: How you can tell if your financial adviser is setting you up for potential ruin

Dana Dovey: Up to 500,000 people die each year from hepatitis C-related liver disease. New Treatment Has Over 90% Success Rate

Justin Caba: Eating Watermelon Can Help Control High Blood Pressure

The Kosher Gourmet by Joshua E. London and Lou Marmon Don't dare pass over these Pesach picks for Manischewitz!

April 11, 2014

Rabbi Hillel Goldberg: Silence is much more than golden

Caroline B. Glick: Forgetting freedom at Passover

Susan Swann: How to value a child for who he is, not just what he does

Cameron Huddleston: 7 Financial Tasks You Should Tackle Right Now

Sandra Block and Lisa Gerstner: How to Profit From Your Passion

Susan Scutti: A Simple Blood Test Might Soon Diagnose Cancer

Chris Weller: Have A Slow Metabolism? Let Science Speed It Up For You

The Kosher Gourmet by Diane Rossen Worthington Whitefish Terrine: A French take on gefilte fish

April 9, 2014

Jonathan Tobin: Why Did Kerry Lie About Israeli Blame?

Samuel G. Freedman: A resolution 70 years later for a father's unsettling legacy of ashes from Dachau

Jessica Ivins: A resolution 70 years later for a father's unsettling legacy of ashes from Dachau

Kim Giles: Asking for help is not weakness

Kathy Kristof and Barbara Hoch Marcus: 7 Great Growth Israeli Stocks

Matthew Mientka: How Beans, Peas, And Chickpeas Cleanse Bad Cholesterol and Lowers Risk of Heart Disease

Sabrina Bachai: 5 At-Home Treatments For Headaches

The Kosher Gourmet by Daniel Neman Have yourself a matzo ball: The secrets bubby never told you and recipes she could have never imagined

April 8, 2014

Lori Nawyn: At Your Wit's End and Back: Finding Peace

Susan B. Garland and Rachel L. Sheedy: Strategies Married Couples Can Use to Boost Benefits

David Muhlbaum: Smart Tax Deductions Non-Itemizers Can Claim

Jill Weisenberger, M.S., R.D.N., C.D.E : Before You Lose Your Mental Edge

Dana Dovey: Coffee Drinkers Rejoice! Your Cup Of Joe Can Prevent Death From Liver Disease

Chris Weller: Electric 'Thinking Cap' Puts Your Brain Power Into High Gear

The Kosher Gourmet by Marlene Parrish A gift of hazelnuts keeps giving --- for a variety of nutty recipes: Entree, side, soup, dessert

April 4, 2014

Rabbi David Gutterman: The Word for Nothing Means Everything

Charles Krauthammer: Kerry's folly, Chapter 3

Amy Peterson: A life of love: How to build lasting relationships with your children

John Ericson: Older Women: Save Your Heart, Prevent Stroke Don't Drink Diet

John Ericson: Why 50 million Americans will still have spring allergies after taking meds

Cameron Huddleston: Best and Worst Buys of April 2014

Stacy Rapacon: Great Mutual Funds for Young Investors

Sarah Boesveld: Teacher keeps promise to mail thousands of former students letters written by their past selves

The Kosher Gourmet by Sharon Thompson Anyone can make a salad, you say. But can they make a great salad? (SECRETS, TESTED TECHNIQUES + 4 RECIPES, INCLUDING DRESSINGS)

April 2, 2014

Paul Greenberg: Death and joy in the spring

Dan Barry: Should South Carolina Jews be forced to maintain this chimney built by Germans serving the Nazis?

Mayra Bitsko: Save me! An alien took over my child's personality

Frank Clayton: Get happy: 20 scientifically proven happiness activities

Susan Scutti: It's Genetic! Obesity and the 'Carb Breakdown' Gene

Lecia Bushak: Why Hand Sanitizer May Actually Harm Your Health

Stacy Rapacon: Great Funds You Can Own for $500 or Less

Cameron Huddleston: 7 Ways to Save on Home Decor

The Kosher Gourmet by Steve Petusevsky Exploring ingredients as edible-stuffed containers (TWO RECIPES + TIPS & TECHINQUES)

Jewish World Review

How diesel engines work

By Marshall Brain

Printer Friendly Version
Email this article

http://www.JewishWorldReview.com | (MCT) You may have noticed recently that you are hearing more and more about diesel cars. That makes sense because diesel engines get better gas mileage than gasoline engines. With gas prices rising so much, people are very interested in any technology that cuts the amount of fuel that cars use.

But have you ever wondered why diesel engines get better mileage? By understanding how a diesel engine works, the mileage advantage makes a lot more sense.

Chances are that you own a car, and that your car is powered by a gasoline engine. So let's start with it. Your engine contains pistons that move up and down. When the piston moves down, it sucks in air and gasoline. Then the piston moves up and compresses the air and gasoline. Then the spark plug fires to ignite the gasoline. That produces a lot of heat, which expands the air, pushing the piston down. The expansion is where the power of your engine comes from.

One problem with the gasoline engine is the compression part. A gasoline engine mixes the air and gas together and THEN compresses it. That limits the amount of compression that the engine can use. You can only compress gasoline so far before it spontaneously explodes. Whenever you hear your engine knock, what you are hearing is these spontaneous explosions. Knocking is bad because it damages the engine.

More compression would make the gasoline engine more efficient. And more efficient engines get better mileage. But as you can see, there is a limit to how much compression you can apply in a gasoline engine.

A diesel engine solves the compression problem, and that is one thing that gives it better mileage than a gas engine. In a diesel engine, there is no spark plug. And the engine inhales nothing but air. The diesel engine compresses that air about twice as much as a gasoline engine would. Then the diesel engine injects diesel fuel straight into the compressed air. The air gets so hot from the compression that it ignites the diesel fuel without any need for a spark.

This is a pretty simple change in design, but it can really improve the efficiency of the engine. The best diesel engines might be up 50 percent more efficient than a gasoline engine of the same size.

Diesel engines have one other trick up their sleeves as well. It turns out that diesel fuel is different from gasoline. Both diesel fuel and gasoline are made up of chains of carbon and hydrogen atoms. But in diesel fuel, the chains are longer. What that means is that diesel fuel is actually heavier than gasoline. If you buy one gallon of gasoline and one gallon of diesel fuel, the diesel weighs more. So the gallon of diesel fuel contains more hydrogen and oxygen atoms than the same amount of gasoline. Meaning that there is about 17 percent more energy in a gallon of diesel fuel than there is in a gallon of gas.

When you add the improved efficiency of a diesel engine to the extra energy in diesel fuel, you have an engine that gets much better mileage than a gasoline engine.

Now this does not mean that diesel engines are perfect. For one thing, a diesel engine is heavier than the same gasoline engine because the diesel engine has to handle all of the extra compression pressure. Heavy engines tend to reduce mileage. Diesel engines tend to produce more soot, although this problem seems to be getting much better in the newer designs. And diesel engines prefer to turn slower than gas engines, meaning that a diesel car may not accelerate as fast as a gasoline car.

The thing that may make all of these problems with the diesel go away is the idea of a hybrid car. We all know that gasoline hybrids are efficient. A diesel hybrid could be even better. Because of hybrid technology, we may see the rebirth of the diesel engine, and you may soon have a diesel car in your garage that gets great mileage.

Every weekday JewishWorldReview.com publishes what many in the media and Washington consider "must-reading". Sign up for the daily JWR update. It's free. Just click here.

Comment by clicking here.



Previously:


How water towers work
How the Dawn mission works
How Kassam rockets work
How the North American Eagle works
Why aren't we flying to work?
How tofu and soy milk work
How Colony Collapse Disorder works
How airbags work
How the U.S. income tax works
How gum works
How caffeine works
How Daylight Saving Time works
How a cruise missile works
How snow making works

© 2007, How Stuff Works Inc. Distributed by McClatchy-Tribune Information Services.

Columnists

Toons

Lifestyles