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Gasoline (petrol) specs

Hello all,

Since a long ago I have been with the question of the Gas types. What makes the difference between the standard, premium and super gasolines? Why some engines require an specific type, does it affect a different altitude (different than sea level)?

What difference does the Unleaded Gas makes? does the other one has lead?

Any guide for this gas grading, and its detonation will be well accepted. Why the diesel gas which apparently is more "greasy" does not need any spark plugs to detonate in the combustion chamber? What type of vehicles use Kerosene? and finally how does all of the above compare to the aviation fuel?

Best regards,

-- Juan Pablo Rojas Graphic Designer - Developer Merca-web.com

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Reply to
JPRW
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Meet Mr Google ;-)

Reply to
Neil Brownlee

Thanks Neil. I guess I open a whole new topic. I found this in the internet. never the less a comparative chart would be useful (if somebody knows)

jejeje

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JUAN

Reply to
JPRW

Additives....

Leaded has lead, unleaded has no lead! The lead increases the octane rating, and also lines valve seats with a protective layer. Some engines require this lead lining, others do not.

Compression ratio in a diesel engine is much higher (about double) that in a petrol engine. If you try to compress a petrol / air mixture at much above 10:1 it will ignite due to the heat before the spark fires. Diesel will not.

This higher compression ratio makes diesel engines more efficient.

However, diesel burns more slowly and with less energy released. Thus it is impossible to make a diesel engine rev beyond about 5000 rpm (it won't burn quickly enough) and power outputs are lower. Hence turbocharging...

Diesel is injected into the already compressed air. Petrol is mixed with air and then enters the uncompressed cylinder, to be compressed by the piston, at which time the spark ignites it.

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Reply to
Tim Hobbs

A diesel will happily rev above 5k, but they don't because they are regulated. The reason they are regulated is that they are very heavily built and high revs will damage them. Landies in particular are known for screaming their guts out when oil gets into the cylinders from a duff head gasket or similar. In this case they are self regulated by the sheer mass of the heavy pistons and crank gear, but I'd bet it's higher than 5k by a long chalk. (My engine revs to over 4k anyway, before the govenor kicks in.)

The engine is limited in power not because diesel won't burn quickly enough but because you can't get enough air in to allow the diesel to burn in higher quantities. Hence the turbo forces more air into thecylinder and allows a higher quantity of fuel to be burnt. Diesel in fact burns pretty quickly, hence the "knock" sound that they produce, but it may well be a lower output fuel than petrol as you say.

TonyB

Reply to
TonyB

what is it that produces that knock sound? and how?

I was talking to a land-rover-bloke and he said you can 'tune-out' the knock for a quieter engine but it'd 'smoke like a bastard'.

Regards. Mark.(AKA, Mr.Nice.)

Reply to
MVP

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