Coil Polarity of Denso motorcycle coils

Post by **DJpowerHaus** » Sat Mar 18, 2006 11:34 pm

Does anyone have a bike or know anything about coils that could help me figure out which pin is + and which is - on Denso coils? They are coil on plugs found on lots of sport bikes including GSXRs, F4... and also I've seen them on Indy cars.

Does it matter? I read somewhere that + and - didn't matter. it'd make a spark either way, but the current would just flow out of the block not into it???

TruckA · Post by **TruckA** » Sun Mar 19, 2006 9:06 am

The first website says that the coil will work either way, but it has a stronger spark if correctly installed. The second website mentions that the polarity matters, and the rest don't mention anything other than how a coil works in general. I'm trying to think back to my general physics classes to see if it matters as well. If the ignition coil was a capacitor that used bi-metal plates instead of coiled wire, I know it would matter.

http://hometown.aol.com/bgahc/01_jwha_c ... plugs.html
http://www.kronjaeger.com/hv/hv/src/ign/index.html

http://hyperphysics.phy-astr.gsu.edu/hb ... ition.html
http://members.shaw.ca/forcelabs/IgnitionCoil.htm

Hope this helps.

Post by **DJpowerHaus** » Thu Mar 23, 2006 5:42 pm

I finally tracked down a GSXR 600 manual which had some great info:

I'm going to be reading through the whole manual tonight. I'm such a nerd for this stuff.