Lotus Elan

Capacitor for radio supression?

PostPost by: 2tmike » Tue Jan 29, 2019 1:32 pm

On the n/s engine bay chassis leg of my S4 there is bolted something that looks like a capacitor and nearby a stray black cable leading from the dynamo that was probably attached to it. Does anyone know the function of this and spec/source of a new one? Thanks
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PostPost by: billwill » Tue Jan 29, 2019 5:04 pm

You are probably right in thinking it is for radio noise suppression; the commutators in dc motors and dynamos are notorious for creating radio noise.

Not sure of a substitute though, Ordinary ones for electronic equipment might not withstand the temperature, humidity etc of an engine compartment. So automotive ones tend to be encapsulated in bigger containers.


Here's a selection for you to hunt through.
https://www.google.com/search?q=automot ... 80&bih=848
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PostPost by: 2tmike » Tue Jan 29, 2019 10:44 pm

Thanks Bill
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PostPost by: nomad » Tue Jan 29, 2019 10:48 pm

It used to be common to just use a capacitor from a points distributor to accomplish radio suppression. Sometimes more than one. Since the disappearance of AM radio it doesn't seem to be necessary anymore.
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PostPost by: stugilmour » Wed Jan 30, 2019 5:25 am

Attached is from the Plus 2 WSM. It shows the various capacitors and where they are located.

HTH

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Attachments
Radio Suppression copy.pdf
This is taken from the Lotus Plus 2 WSM where they cover Radio Suppression
(307.23 KiB) Downloaded 122 times
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PostPost by: 2tmike » Thu Feb 07, 2019 5:23 pm

Hi Stu
Yes it does thanks
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