Re: Octane

On 25 Jun 2003 16:48:57 -0700, fpmacko2 (AT) yahoo (DOT) com (F. Mackowick)
wrote:

This was true in the past, but not for cars such as the RX 330 that
have a knock sensor. The ignition controller will set ignition timing
based on the antiknock ability of the fuel. A higher octane fuel will
allow the controller to run with more advanced timing. Progressively
early ignition timing during the compression stroke allows the motor
to extract more of the heat energy available in the fuel by letting
more of the combustion process complete during the power stroke. All
octane grades have the same potential to generate heat. However,
higher octanes facilitate a more efficient combustion process.

Therefore, what the RX manual says about recommended octane is true.

Which is exactly what the FTC article is referring to.......whatever
the manual recommends is what you should use.


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