rotary>piston

you know what's weird? The trailing coil is significantly bigger, but much less important. Try pulling a trailing wire at idle, no difference, pull a leading, and you almost stall.

Yes, trailing on top.

Suds

The trailing coil is bigger because it has two ignitors, unlike the leading which only has one, the leadings fire at the same time and the trailings fire independantly.



Trailing is waste spark, but try running at low rpms and going down the road with the trailing coils unpowered, i have tried it, it doesn't work.