16 Ignition coils test

[Cheshire Cat]

Well didn`t knoe where to put it exactly but it is quite usefull info for some of us, esp for those who`s into EFI etc

enjoy!

[Redracn]

Reasonable effort by these guys and a lot better than most but I would still only give them 50%. Checking the temperature rise is good. The power supply was inadequate. Locating the saturation point is required but it only takes a few seconds to do it once you have the test rig running. For coil on plug applications the battery voltage has little affect unlike what they reported as does the rpm as pretty much any coil on plug can do 20,000+rpm with the limitation being its temperature rise in the given application.  But the biggest mistake is the singular focus on energy. There is another very important part to a coils performance especially on boosted applications and they have ignored it. The "Maximum Available Voltage" determines if the spark can jump the spark plug gap under the cylinder pressure. If the available max voltage is not high enough then you have no spark and a misfire usually showing up around peak torque . Also most of the energy that would have gone into the spark is absorbed by the igniter electronics greatly heating it. The spark current is also important and while integrating arc voltage x current gives the energy delivered you need to know the spark duration/current as for the same energy you can have a short duration high current or a low current long duration spark and whiles a longer duration may help a poorly tuned engine idle a bit better a spark that last 10 degrees of crank angle at 6000rpm is of no use because  if you have not ignited the fuel in less than 1 degree of crank then you have bigger problems to sort out and a shorter duration higher current spark could be the answer with its higher instantaneous power to ignite the mixture.

I would ignore their results as the focus on energy delivered alone is only small part of the story in any well designed ignition system.