CDI powerful multi-spark

[Greg Hermann]

>Never heard of a spark being able to do any damage. Sure the timing of the

>Unfortunately there are no O2 sensors fitted,  But before we engine blew
>we put out the plugs and realised that the mixture was a bit week.  We
>increased the size of the jets but it seems the harm has already been
>done.  It was loosing a bit of performance when it got to 5000 on top
>gear , on lower gears performance was better.
>I can understand that weak mixture can heat up the chamber but I have
>heard it from two sources that very powerful spark can melt the piston.
>Can this be true?
>thanks
>Michael
>
>>> I have put a CDI which gives a fairly powerful multi-spark on a 2
>litre
>>>  Ford pinto engine.  This engine is tuned to go up to 8500 RPM.
>>>  However after some runs the engine broke.  When we opend the engine
>up
>>>  we found that on piston was melted.  A friend of mine told me that a
>>>  powerfull spark may be the cause.  Has anyone encountered such a
>>>  situation and how can it be rectified.
>>>  Thanks in advance
>>
>>That souinds more like (1.) lean mixture, or (2.) (less likely)
>retarded

Actually, given that the effects were most noticeable in one hole, it
mightta been a vacuum leak which affected the one cylinder more than the
others-----

Seriously doubt that spark couldda caused it, unless U had sumpthin' that
said "Lincoln" or "Miller"  on its side hooked to the other end of the plug
wire!!

Sometimes running an extended gap plug inna chamber which ought not to have
one will cause such problems, although most of the problem comes from the
effect that gap location has on timing.

Regards, Greg
>>
>
>
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