coil on plug

[Weapon]

Last summer I ran into a fellow rider on a kz1000 or kz with a gpz engine I forget which. in any case he had individual coils on his spark plugs, curious I asked him what was the deal. he said they worked pretty good and the whole set up cost him about a hun cdn on Eblag. he was banging on about reduced spark delay and whatnot, and it seemed like a reasonably good idea.  any of you guys mess around with that stuff? notice any improvement? or is it just as well to buy a nice set of aftermarket coils and be done with it?

Edited August 6, 2015 by Weapon
cant spell for shit

[Captain Chaos]

check this out from halway down the page

 

[Weapon]

awesome full of great info. thanks!

[canamant]

spark delay ?  WTF.  juice travels at the speed of light.

 

[Weapon]

I think he may have been referring to coil recharge time. because the coil has to recharge to generate the spark twice as often with a two wire per coil unit than if each plug has its own coil then the recharge time is halved.

[Gixer1460]

Recharge time doesn't make any difference if running wasted spark which most are ! It needs a cam sensor and an ecu that can run sequentially for any benefit.

[canamant]

Cam sensor isn't the best idea though.  Spark timing is related to crankshaft position.  There is always some lash between camshaft and crankshaft.

[Captain Chaos]

if it has to run sequential ignition, a cam sensor is needed so the ECU knows which of the four cilinders is at compression stroke.

[Gixer1460]

if it has to run sequential ignition, a cam sensor is needed so the ECU knows which of the four cilinders is at compression stroke.

Exactly - the actual camshaft position isn't critical to spark or injection timing - just to indicate where in the cycle the engine is - its generally known as a sync sensor ie. it synchronises the ecu timing to, generally, cylinder #1. 

[Captain Chaos]

newer bikes sometimes don't have the camshaft sensor, they have the MAP sensor located in the airbox in such a way that it recognizes the pulse of (for example) cil. 1. But let's not get too far off topic.

[wraith]

If it was me, and not running the bike on the drag/race strip but on the road, I'd just get a good Dyna S and Dyna coils/HT leads. Been down the route of 8 plug heads and Magnetos, and for the street - apart from looking good - there's no point.

Edited August 16, 2015 by wraith
put 4 not 8 LOL

[Gixer1460]

Whilst i've used Dyna 'S' on plenty of engines it ain't exactly cutting edge is it! Mechanical advance, no retard facility or rev limiter - might as well use Breaker points ! Agree with the Mag thing though but when they do work you get a bloody big fat spark that would ignite water!