I need to replace my distributor cap. The one fitted has a black Bosch shroud, what is purpose of it?
Supposedly helps suppress interference created by the dizzy on radio reception and the like. On a similar note, read recently that the copper strap between bonnet and body does much the same, something scientific about getting rid of the static that builds up with fast flowing air passing over it... though that one might just be an inter-web crock.
