CDI powerfull multi-spark

[Michael Farrugia]

Hello all,
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
Michael

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