60KV coil??
What does that mean?
it doesn't mean 60KV spark
Because the voltage that jumps the gap can be as low as 6 KV with no fuel and low Compression
and 12-25 KV with compressed fuel and air in the gap
so if it fires at 25KV it will fire at 25 KV
if the plug fires at 30 it fires at 30
you'd have to open the gap up to something silly to get it to be 60 KV with a moderately sensible combination of CR and Fuel just not going to happen on a car that is streetable using a normal ignition set up
you might get 60 KV if you spike it with a CDI but again the KV level the spark is produced at is dictated by how hard tha gap is to jump and with all else the same it will still be 25 or 30 KV
makes no odds what it says on the coil
so that 60KV rateing is one of 2 things
1) the maximum voltage it can withstand without shorting out inside
2) the maximum voltage they managed to achieve using that coil and a huge gap at the plug that you would never run in a car engine.
CDI---very high voltage low current into primary can produce very very high voltage low current out of the secondary if you conspire to make the gap that needs to be jumped very large
in general though rateing a coil by KV is marketing rubbish
rate a coil by turns ratio
rate a coil by primary and secondary resistance
Rate a coil by saying perfect for use in a capacitive discharge igntion....
rating a coil by the effectiveness of the insulation used in its manufacture says nothing about performance its about as much use as saying this coil is RED this coil has a sticker with a lightning bolt on it
2 coils in series
one end sees 12-14 volts the other end sees 0 volts both coils then run on 6-7 volts if they are exactly the same type.
you have doubled the resistance in the circuit so you have reduced the current flow by half.
if it was 3 amps its now 1.5 if it was 6 its now 3
current flow dictates how fast the field grows to maximum. lower current flow means slower growing and smaller magnetic field
producing a not very impressive spark from each
if they are not the same type the voltage will be distributed across them in the same ratio as their primary resistance.
2 coils in parallel
you consume double the current when they are ON
current is usually limited by the coil primary resistance or the ballast or both
its limited so that you don't
1) burn out the points
2) burn out the blue box orange box chrome box etc
3) overload the wires
if the max current was 6 amps each coil will now try to allow 6 amps to flow
if the limit to this is external to the coil they won't flow the 6 amps they expect to flow
the magnetic field they create will take longer to grow to maximum
you kinda doubled the dwell you need to create a good spark
or reduced the operating rpm range by approximately 1/2.
if the switch (module/box or points) can flow 12 amps both coils will work as intended but marrying up the secondary output is not necessarily going to work. unless everything is totally identical.
and i wouldn't try it with my tacho connected.
better to get 1 single coil with a different primary resistance... lower
a switch (module or box) that can put up with flowing a current in the 6 - 8 amp range
and a ratio that produces a higher voltage spark
usually indicated by the coil manufacturer suggesting slightly wider plug gaps
HEI coil
low primary resistance 0.6 ohm designed to run at 14 volts and a suggestion of 40 or 45 thou gap at the plugs
Mopar coil low primary resistance 0.6 ohms designed to run at 8-9 volts with a plug gap of 30 or 35 thou
lower primary resistance means shorter necessary dwell to get to the magnetic field up to decent level hence improved RPM range
doubling up coils in parallel gives the impression of lower primary resistance
but that isn't the case both coils have the same primary resistance they always had
just the current has two routes to follow rather than 1
No real gain
if you want more than 1 coil look up wasted spark ignition you could fit a megajolt and use a Ford EDIS coil pack or 2 off a v8 or 2 I4 fords
Dave