Adam_B
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Registered: 13th Dec 00
Location: Lancashire
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Ooh we covered this when i did motorsport at college a few years ago, if i remember properly Diesel is more volatile than Petrol, meaning you get more bang for your buck, like you have to use a spark, air and compression to ignite a little bit of petrol where as in your deisel its just air and compression. So straight away your getting more power, when i say power im talking about the actual turning force that the pistons are producing with the help of the crank, or torque.
In theory you could run a Diesel upto silly RPM but you would sacrifice a lot of your torque for not much gain in peak horse power. However that doesnt mean you should be bouncing it upto the limiter every gear, the engine hasnt been designed to run big RPM, its not impossible to make a diesel engine do that, just pointless.
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CorsAsh
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Registered: 19th Apr 02
Location: Munich
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I thought petrol is more volatile? Volatility refers to the ease with which a liquid evaporates, and petrol evaporates more easily than diesel. If you threw a lit match into diesel, it'll usually just go out, whereas the petrol vapours will ignite. Not sure if it changes at higher pressure though.
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Adam_B
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Registered: 13th Dec 00
Location: Lancashire
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Im probably using the wrong word then, what i mean is its easier to ignite diesel that petrol when its all squashed together with some air. It was ages ago when we did it, plus i was probably smashed at the time 
[Edited on 23-08-2008 by Adam_B]
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Kurt
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Registered: 23rd Oct 05
Location: Hi
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rotating triangles within a a figure of 8 is witch craft i tell thee!
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CorsAsh
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Registered: 19th Apr 02
Location: Munich
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quote:
Originally posted by Adam_B
Im probably using the wrong word then, what i mean is its easier to ignite diesel that petrol when its all squashed together with some air. It was ages ago when we did it, plus i was probably smashed at the time
[Edited on 23-08-2008 by Adam_B]
quote:
Diesel engines use compression ignition, a process by which fuel is injected after the air is compressed in the combustion chamber causing the fuel to self ignite. By contrast, a gasoline engine utilizes the Otto cycle, in which fuel and air are mixed before ignition is initiated by a spark plug. Most diesel engines have large pistons, therefore drawing more air and fuel which results in a bigger and more powerful combustion. This was originally implemented in very large vehicles such as trucks, locomotives and ships, (and also as a stationary engine), as more efficient replacement for the steam engine. Starting in the 1930s and initially developing slowly they have been used in a few cars. Since the 1970s diesel engines have developed dramatically and have been used in many more cars, starting with larger on road and off road vehicles (especially SUV's in the USA). As they have been refined they have been used in smaller and smaller cars. Today the smallest cars on the European market have a super efficient diesel engine option and forty percent of all new car sales in Europe are diesel.
Wikipaedophilia.
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