Twin Spark

reeac

My Jazz 1.4 has the twin plugs per cylinder engine dating back ca 9 years. Does anyone know whether the failure of a plug is detectable from the running of the engine? I've no reason to suspect any such failure but just wondered.

forgotmyname

Depends how bad it is. a slightly weaker spark will just be slightly down on power and economy and may not be detected.

A serious breakdown of a spark could see issues idling or at higher revs, A misfire would be present then.

arcon5

I suppose the effects could be a rougher engine, poorer emissions and more smoke.

Spark plugs can actually spark multiple times anyway for better combustion. With twin plugs per cylinder, a single poor spark on one cylinder is unlikely too affect the running too much.

EssexExile

I know that with an light plane engine when you turn off one magneto, so only one plug firing in each cylinder, the revs drop slightly. I doubt you'd notice just one plug not working. If you want to know if they are all working the same, take them out & see if they are all the same colour.