Date: Wed, 24 May 2006 05:02:52 GMT
From: Bob <>
Subject: Re: Regular gas in a 9.5?

On Tue, 16 May 2006 22:19:45 -0400, Fred W <Malt_Houndnospamm-me-not*> wrote: >But if the reason the ignition is that the engine is pinging due to >early combustion of the fast burning, low octane fuel, doesn't it make >sense that the fuel will still be fully burned during the power stroke? I'm certainly not an engineer - but my crude understanding is that we advance the timing to start the burn earlier in the stroke and gain more power, but that it requires higher octane in order to do this. If I am not misunderstanding your statement, it seems like you are inferring that we advance the timing to compensate for higher octane gas and that therefore we get the same power from lower octane and retarded timing. If that was true, there would be no reason to have higher octane gas - we'd just retard the timing on all cars.

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