Mazda Rotary Club

General => General Technical => Topic started by: L18M on September 23, 2011, 12:57:35 AM

Title: How to test coils?
Post by: L18M on September 23, 2011, 12:57:35 AM
How can you test ignition coils to see which is the better one to use?

regarding tii leading coil.

thanks in advance prof :p
Title: How to test coils?
Post by: bumpstart on September 23, 2011, 02:03:18 AM
http://www.amazon.com/KD-Tools-2756-Calibrated-Ignitions/dp/B0002STSBC
be sure you order the HEI version ( no anode in the spark plug well )

else the poor mans test is to use a dirty spark plug with an earth clamp to the battery around its belly
Title: How to test coils?
Post by: Prof on September 23, 2011, 07:44:51 AM
If you have the right kind of test gear and are bloody careful (the voltages involved could put an upside down smile on you in a second...) then the info on this site can be very useful for testing coil/plug combo - can even do it on a running engine.
 
http://www.motor.com/magazine/pdfs/052005_04.pdf
 
If you lift the small plastic cap on the coil pack, you can get access to the 2 coil screws for the primary winding - a scope probe and scope with at least a 500v input rating can show you what\'s going on in the primary side (and becauase it\'s a coupled coil, you can get some info for the secondary circuit and spark plug too).
 
I\'ve successfully used a DS Nano scope (ebay jobby) with x10 probe - get some really useful info - but don\'t touch anything - it really bites. :eek::2eek
Title: How to test coils?
Post by: L18M on September 23, 2011, 12:18:27 PM
cheers guys, i think i\'ll try the poor mans way.
i dont have any test gear :(
Title: How to test coils?
Post by: B.Martin on September 23, 2011, 01:25:40 PM
I hope its my not my lovely RE-A ones your testing :Giggle
Title: How to test coils?
Post by: L18M on September 23, 2011, 05:50:02 PM
Quote from: B.Martin;790058I hope its my not my lovely RE-A ones your testing :Giggle

lol, no, the actual coil packs nto leads :Giggle