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
http://www.merca-web.com/

Meet Mr Google ;-)

--
Neil

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

http://www.germanmotorcars.com/Detonation.htm

JUAN


"Neil Brownlee" <[email protected]> wrote in message
news:[email protected]...
> Meet Mr Google ;-)
>
> --
> Neil
>
>

On Fri, 04 Mar 2005 11:49:51 GMT, "JPRW" <[email protected]>
wrote:

>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?

Additives....

>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?

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.

>
>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?
>

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.

www.howstuffworks.com



--

Tim Hobbs

'58 Series 2 88" aka "Stig"
'77 101FC Ambulance aka "Burrt"
'03 Volvo V70

My Landies? http://www.seriesii.co.uk
Barcoding? http://www.bartec-systems.com
Tony Luckwill web archive at http://www.luckwill.com

> 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...

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