[Diy_efi] Rich detonation?

[Joseph Obernberger]

The reason for asking about rich detonation is that in my own experience 
when running AFRs lower than 10, the ECU will sometimes pick up knock - 
or at least interpret the signal from the knock sensor as knock.  This 
causes the ECU to retard ignition timing and lower boost pressure.  
Sometimes this will happen when tuning at not particularly high boost 
pressures, but very rich mixtures.

-Joe
http://www.lovehorsepower.com
http://videos.lovehorsepower.com

Mike wrote:
> At 03:23 PM 11/20/06, you wrote:
>   
>> The richer the mix the faster the burn.  The leaner the mix the slower the burn.  It is all about ignition timing, however the source of detonation aside from improper timing is from poor quality fuel or fuel not suited for a specific compression ratio.  Poor fuel combined with hot spots in the combustion chamber results in pre-ignition.  I'm not really sure what you mean by "rich detonation".  The whole engine is a system... all the parts and processes must match.
>>     
>
> My post arose as a result of responding to this post by Joseph Obernberger
> who started the topic with the same subject line:-
>
>
>   
>> Hi,
>>   I've read in various places that it is possible to run an engine so rich that detonation can occur - or at least the knock sensor would pick up what sounded like detonation.  Has anyone ever experienced this?  Any truth to it?
>> Thanks!
>>     
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