Dynodom Posted April 25, 2019 Report Share Posted April 25, 2019 MSD igntion boxes, which ones need Spark Edge falling / rising ? TIA Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 26, 2019 Report Share Posted April 26, 2019 Hi Dom, All that I have seen need to use rising edge. If you give me the model or part number I can decipher it from how they describe the wiring in the instructions. Most of them are designed to be driven from points or some other equivalent "dumb" coil driver type system Quote Link to comment Share on other sites More sharing options...
Dynodom Posted April 27, 2019 Author Report Share Posted April 27, 2019 Hi Adam at the moment , spark edge is set to falling and all seems to work as intended. But I want to be 100% sure It is a 6AL or 6A sorry for my delayed reply Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 28, 2019 Report Share Posted April 28, 2019 Both 6A & 6AL should have spark edge set to rising. I expect you will have significant timing drift with RPM when set to falling. Quote Link to comment Share on other sites More sharing options...
Stevieturbo Posted April 28, 2019 Report Share Posted April 28, 2019 Which can lead to even more significant engine damage. Avoid such boxes, they are totally unnecessary . Quote Link to comment Share on other sites More sharing options...
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