On 05/04/2011 09:57, Michael Rigby-Jones wrote: > If you had two spark gaps in one plug they would be separated only by a > very short distance, so any advantage of dual flame fronts would be > lost. The point of a twin spark system (apart from redundancy in > aircraft applications) is to reduce the time taken to burn the charge by > starting two flame fronts, meaning less ignition advance is required > (which is always a good thing). > Okay, thanks for the explanation - I can see how greater separation=20 might be preferable. However, the OP was talking about creating the=20 fiercest (single) spark possible - surely two sparks would be "fiercer"=20 than one? I'm not saying this would actually improve performance, I don't know=20 enough about internal combustion to make a call, but it seems it might=20 achieve the OPs goal of creating a longer/fiercer spark. Out of interest, how far apart are the spark gaps in a twin spark=20 system? I googled but all I got was pages on Alfa Romeos, of which I=20 looked at the Wiki page and it doesn't go into too much technical detail. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .