MadSci Network: Engineering

Re: What are the differences between gasoline and diesel cars?

Date: Thu Jul 19 19:48:25 2001
Posted By: Adrian Popa, Director Emeritus, Hughes Research Laboratories
Area of science: Engineering
ID: 994752011.Eg


What is the difference between a gasoline engine and a diesel engine?
In a diesel engine there is no spark plug. Instead, diesel fuel is injected into the cylinder,
and the heat and pressure of the compression stroke cause the fuel to ignite. Diesel fuel
has a higher energy density than gasoline, so a diesel engine gets better mileage.

The excellent web site on How Stuff Works goes into the details of both types of engines
with super animated drawings that are much better than my trying to describe the engines
operation in words. Start with the engine web site, it describes different types of gasoline
engines and leads into the second web site that describes Diesel operation:


http://howstuffworks.lycos .com/diesel.htm

Best regards, Your Mad Scientist
Adrian Popa

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