Dyna iggy..run hotter?

Just wondering how much hotter an electronic iggy runs? Does it run hot enough that it would make it run lean enough that u would have to go up jet sizes? ...thx in advance

Compared to what?


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I don't understand the question.
Steve

Maybe he is referring to the BS advertising claims that electronic ignitions "hotter spark" burns more fuel and so would make the engine run leaner. That's a myth.

Compared to points...

bountyhunter wrote: Maybe he is referring to the BS advertising claims that electronic ignitions "hotter spark" burns more fuel and so would make the engine run leaner. That's a myth.

You may get a fuller fuel burn, with a bigger spark, but there would never be a difference that would require rejetting, The engine sucks in x amount of fuel with y amount of air through the carbs, all that's happening with a weak spark is not all the mixture is burned in a timely fashion. If you put bigger jets in you would just have an overly rich air fuel mixture, assuming the system was set up properly in the first place.

Maybe I'm wrong, but I would think if an engine has an air/fuel mixture under compression and a spark lights it off so it begins to burn the air/fuel will all burn or else be pushed through the exhaust system if not completely burned. I don't understand how a "hotter" spark is going to make more air/fuel mixture burn than a less hot spark. In other words, I would think that since the spark is only a momentary event, and that event ignites the air/fuel mixture which then burns to completion on its own, then any spark that ignites the mixture will burn the same amount of mixture since the spark is not a continuous event that lasts until the last bit of air/fuel mixture is burned. That's not to say that a hot spark is not desirable. To me the advantage of a hot spark is that it has a better chance of immediately igniting the air/fuel mix than would a weak spark. Since the air/fuel mixture will burn to completion whether ignited by a points or electronic ignition source I don't see how one would cause the engine to run hotter than the other. Ed

I' m not sure I exactly understand the benefits of a better spark or the use of twin plug heads on some machines, but it seems the faster all the fuel burns before the piston begins to move away from TDC the better for overall power output for a given amount of fuel. While we think of something lighting or exploding immediately, what we might think of as instantaneous in the normal sense, is not the same when pistons are moving at the speed they are inside an engine.

With a weak spark it is common for guys to go to the carbs first, lean them out only to find it doesn't run any better. A hot spark will aid in combustion given the locality of the plug in the cylinder. It was said the early Honda 750's had a fatter spark to compensate for the location of the plugs. In no case have I heard of a hotter spark causing the engine to run hotter unless it because it is finally running cleaner. That being the case you could say it does run leaner.
Steve

35,000 volts vs 15,000...... and since our bikes have a wasted spark system with less time to recover I will always run the Dyna's even though its may not be as big of a deal as it sounds.

Wyliecoyote wrote: Just wondering how much hotter an electronic iggy runs? Does it run hot enough that it would make it run lean enough that u would have to go up jet sizes? ...thx in advance

Simple answer = NO.

K thanks...makes sense