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Re: Introducing Shell V-Power

To: "Paul Hunt" <>
Subject: Re: Introducing Shell V-Power
From: "Simon Matthews" <>
Date: Fri, 25 Aug 2006 10:21:13 -0700

On 8/25/06, Paul Hunt <> wrote:
> I've recently started
> experimenting with attaching a knock-sensing retard system in place of the
> vacuum (at least) advance, and that would be the ultimate solution to fuel
> grade variations and distributor advance curve deterioration with age, not
> that the original curves are ideal for today's fuels.

That seems interesting, and a little counter-intuitive that one could
replace an advance system with a retard system. Can you explain more?

Another interesting question is the amount of knock that you want to
obtain. It is my understanding (from Ford engine designers many years
ago), that low speed knock (ie, the type that you can hear) actually
results in slightly greater power output, so tuning to zero knock may
be counter productive if your objective is performance.


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