Technical how to make ignition coils run cooler

[pekval]

To make ignition coils lasting longer (= running cooler) I have always removed the nice aluminium cover, which is on top of ignition coils. Is this a good idea .. or is there a to me unknown reason to have this cover there?

 

[bollie69]

to prevent water running into the spark plugs holes and cosmetic

 

[s130]

I think the cover is there for the following purposes

1) Make the finish / installation look neat
2) Protects wires/components from unnecessary damage
3) Protect said components from excess moisture that can cause ignition faults & misfires
4) NOTE! a more dubious suggestion - reduce fire risk if coil/coils were to catch fire

To my knowledge on all cars (well certainly Fiats) the coil pack & plugs are covered in.

Removing the cover may help the coil packs to cool a very very very little bit but as they are tightly bolted to the cylinder head their actual temperature is determined by the thermal mass and temperature of the cylinder head.

It could be argued that allowing cooler air onto the back/top of the coil pack could introduce differential thermal stress across the component.

Please note. I'm thinking / reasoning aloud and have no definitive proof or facts to support the above other than engineering common sense.

 

[bollie69]

and i've hardly seen one coil failing. and if it does, they can be found cheaply

 

[pekval]

You all made my solution sound bad idea. Perhaps I one day take the pain and measure with thermo couple if they run cooler without cover. Cooler coil also make larger spike .... but who know if it is needed. Thanks for all for comments.