HT setup for coilpacks on a 450 serpentine Chim?

[thenick]

As it says in the title... I've dug up this picture:



Is this also correct for my 97 450 Chim?

[GreenV8S]

Yes (assuming those grey squares are meant to be capacitors).

[thenick]

Thanks Peter, are capacitors necessary there? I can't imagine coils would be that susceptible to voltage spikes?

[GreenV8S]

thenick said:

Thanks Peter, are capacitors necessary there? I can't imagine coils would be that susceptible to voltage spikes?

The coils produce a spike on the low tension side each time they fire.
If you're driving them directly from the ECU you'll sometimes find that this can be enough to give the ECU hickups. Adding these capacitors is one way to address that. If they're recommended for your ECU then it would be sensible to fit them. Otherwise, you could just wait and see if there's a problem.