Conrod

On a twin engine ignition module is it possible for only 1 plug to go bad and stop working?
Geoff

Truckracer

My Feedback: (19)

Twin ignitions have separate coils for each spark plug but share common electronics to fire those two coils. So yes, one plug could very easily stop working if it's associated coil failed.

Conrod

Thanks for that Truckracer.
Now just have to get a replacement module under warranty as the engine has only had 12 or so runs.

Conrod

Hi Truckracer
I have been told that the supply voltage maybe dropping to the ignition and causing the plug not to fire, does this sound at all possible?
Battery is a 2 cell LiFe 6.6volt 3800mAh running through a tech aero IBEC.
Have not had a chance to test the voltage at the ignition as yet.
Geoff

Truckracer

My Feedback: (19)

Yes, possible but not likely with the battery and IBEC you are using. The standardTech Aero IBEC is capable of 6.6V output with the right jumper configuration and is adjustable down 3 steps from there. You have never stated what ignition you are working with and that would be good to know here. It is important to have a supply voltage within the range printed on the ignition module. Some ignitions don't seem to like operation at the lower limits of the voltage range and low voltage may cause a miss, run rough or cause hard starting and / or kick back. What engine / ignition are we dealing with here?

Conrod

The IBEC is the standard type set at 6.6V. The engine is an RCGF 21 twin with the RCGF ignition module as supplied with an operating range of 4.8V - 8.4V.
Geoff

daveopam

My Feedback: (9)

I would switch plug wires and see if the other side starts to fire.

David

Conrod

I have switched plug leads and yes then the opposite cylinder does not fire.
The problem is common to only 1 spark plug lead. I believe as Truckracer said its a faulty coil but RCGF have said to test voltage to the ignition module.
I can not see how low voltage would effect only the 1 pug lead.
I will try and run the motor this weekend with a battery plugged directly into the ignition should prove if there is a voltage problem or not.
Geoff

Truckracer

My Feedback: (19)

Conrod

Do you know if Rexcel make the ignition module or if RCGF make their own modules?
All jumpers are removed from the IBEC.

Truckracer

My Feedback: (19)

Conrod

Definitely RCGF unit no other markings.
Geoff

Conrod

Well tried running engine today with battery plugged directly into the ignition, no change, still 1 cylinder not firing.
So its a faulty ignition module.
Geoff