[Diy_efi] Ignition Timing

[Jim Butterfield]

Well brian thats a good point... I would think if its a heat issue then knock should occur slowly and build up as the heat cant escape and then start the incoming fuel igniting.... but if a fuel pump died then its all of a sudden and then as my friend experienced... BAMM... three popped pistons
 
jim

"Geddes, Brian J" <brian.j.geddes at intel.com> wrote:
In my mind, relying on the knock sensor is an acceptable method iff you
assume that knock will start gently, and proceed to become more severe.
If severe knock were to occur without being preceded by light knock, by
the time the ECU pulled timing I would think you'd already have a good
possibility of holing a piston.

Am I wrong? Does knock usually start light and become worse? Are the
trends different for NA and boosted engines? What about very high
(15-30 PSI) of boost?

- Brian Geddes


>
>> Beyond that, you would have to rely on the knock
>> sensor. 
>
> I don't udnerstand what the problem would be with that.
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