CDI powerfull multi-spark

[Bruce Plecan]

I ain't seen a spark hurt a motor, but what can happen is that with
a poorer ignition system, that cylinder would have mis fired.  But,
with a good spark that too lean mixture was ignited, and then you
had a problem.  
   That's way you should first design an over kill fuel, and ignition
system, then start tuning. IMHO
Bruce

>
>> 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
>timing.
>  Either can cause combustion chamber temps to soar...But, retarded timing
>will cause a serious reduction in performance, which wasn't mentioned,
>so I'd wager the "lean-out" scenario is what took place...
>Do you have any data such as O2 or (?) readings?
>Mike V.
>