rhino_mac Posted September 7, 2014 Report Share Posted September 7, 2014 Might be a really daft question, but I have just bought a Lucas Ignition coil for my TR3 from Beaulieu autojumble. Having got it home, it sounds like it has water swishing round in it. Is this right, or has something broken inside? I've read on Google that some are filled with oil but I can't find anything definitive. It's a Lucas coil if that helps. Thanks Richard Quote Link to post Share on other sites
RobH Posted September 7, 2014 Report Share Posted September 7, 2014 Yes that is right Richard - it is oil filled to provide insulation and cooling. Most modern coils are sealed in epoxy but all standard period coils are oil-filled. Rob Quote Link to post Share on other sites
rhino_mac Posted September 7, 2014 Author Report Share Posted September 7, 2014 Brilliant, thanks. Worried I'd bought a duff one! Quote Link to post Share on other sites
Ashley James Posted September 7, 2014 Report Share Posted September 7, 2014 Epoxy isn't as good as oil for cooling coils, so is only used for applications where they might be shock damaged. PerTronix do one for Baja type racing for example. Therefore virtually all use oil. Bosch and Beru make special vacuum oil filled coils for use upside down on VW beetles. You can tell I've had a lot of problems with coils. Quote Link to post Share on other sites
RobH Posted September 8, 2014 Report Share Posted September 8, 2014 Ashley - there are (or were) millions of road cars running around with open-frame type HT coils (i.e not in metal cans) all of which are epoxy sealed. Even my old Nova from 1984 had one. Nothing special about it - it works and its cheap. Quote Link to post Share on other sites
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