Hybrid Car – More Fun with Less Gas

better mileage with higher octane? - Page 14

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Posted by Bob on January 8, 2007, 4:20 am

I didn't insult you and cheese didn't make me think you were lying. Good
luck with everything else..... wow

Posted by clare at snyder.on.ca on January 4, 2007, 5:28 pm

On Wed, 3 Jan 2007 21:29:50 -0500, "Solar Flare"

You are being nitpicky and don't know what you are talking about. It
is NOT the speed of the burning of the gasoline that is slowed down.
It is the virtual explosion of the dis-associated end gasses that is
Slower fuel burn INCREASES the tendancy of an engine to detonate.

Posted via a free Usenet account from http://www.teranews.com

Posted by Steve on January 4, 2007, 6:57 pm

Solar Flare wrote:

I assume you mean "slowing down combustion," whch can be re-stated as
"slowing down the speed of the flame front away from the spark plug in
the cylinder.  Higher octane fuel doesn't do that. Most "articles" are
wrong ;-) Water/alcohol injection, OTOH, DOES slow down the flame front
as well as pre-cooling the intake charge. Exhaust-gas recirculation
slows down the flame front, but actually heats the intake charge a
little bit.

Posted by y_p_w on January 3, 2007, 11:47 pm

Solar Flare wrote:

High octane unleaded racing fuel supposedly burns faster once ignited.
However - it has a higher resistance to detonation or preignition.  A
spark is usually hot enough to ignite the mixture.

Posted by Solar Flare on January 4, 2007, 1:22 am

High compression needed it to reduce dieseling.

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