Octane

[jlagnese at massed.net (John S. Lagnese)]

That is interesting, that higher octane fuel is less likely to ignite.
That's why it is less prone to knocking.

-----Original Message-----
From: scirocco-l-bounces+jlagnese=massed.net@scirocco.org
[mailto:scirocco-l-bounces+jlagnese=massed.net@scirocco.org] On Behalf
Of matt
Sent: Saturday, July 02, 2005 9:04 PM
To: scirocco-l@scirocco.org
Subject: Octane

ok i pulled this form here
http://encyclopedia.laborlawtalk.com/octane_rating

It supports my argument that that the stock 8v is fine with 87

Octane rating

The most important characteristic of petrol is its Research Octane
Number (RON) or octane rating, which is a measure of how resistant
petrol is to premature detonation (knocking). It is measured relative to
a mixture of isooctane (2,2,4-trimethylpentane) and n-heptane. So an
87-octane petrol has the same knock resistance as a mixture of 87%
isooctane and 13% n-heptane.

There is another type of Octane, called "Motor Octane Number" (MON),
which is a better measure of how the fuel behaves when under load. Its
definition is also based on the mixture of isooctane and n-heptane that
has the same performance. Depending on the composition of the fuel, the
MON of a modern petrol will be about 10 points lower than the RON.
Normally fuel specifications require both a minimum RON and a minimum
MON.

In most countries (including all of Europe and Australia) the 'headline'
octane that would be shown on the pump is the RON: but in the United
States and some other countries the headline number is in fact the
average of the RON and the MON, sometimes called the "Road Octane
Number" or RON. Because of the 10 point difference noted above this
means that the octane in the United States will be about 5 points lower
than the same fuel elsewhere: 87 octane fuel in the United States would
be 92 in Europe.

It is possible for a fuel to have a RON greater than 100. This reflects
the fact that isooctane is not the most knock-resistant substance
available. Racing fuels, Avgas and LPG typically have octane ratings of
110 or significantly higher.


_______________________________________________
Scirocco-l mailing list
Scirocco-l@scirocco.org
http://neubayern.net/mailman/listinfo/scirocco-l