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Copper or Plantinum Spark Plugs?

Your old Chris-Craft electrical system can be a challenge. If it runs on "juice" pose your questions and offer your advice here.

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cenger
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Copper or Plantinum Spark Plugs?

Post by cenger » Thu Oct 20, 2016 3:49 pm

If ignition converted to a Pentronix 6v should spark plugs be upgraded from Copper to Platinum? I have a 1935 Chrysler, as I do my fall maintenance wondering if I should upgrade my plugs.
1935 Gar Wood 16-35
1929 Gar Wood 28-30

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Don Vogt
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Re: Copper or Plantinum Spark Plugs?

Post by Don Vogt » Fri Oct 21, 2016 8:57 am

interesting question. I have the pentronix, KA engine, and just use the copper. I googled the question and it appears the issue is in general between the two types of spark plugs is longevity vs. conductivity. apparently copper is more conductive but platinum lasts longer. Since I change my spark plugs every year, longevity isnt an issue for me. Not sure what issues if any, the use of electronic ignition presents. If you arent having a problem, why change?
1938 Chris Craft 17' Deluxe Runabout "Jennifer II"

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Re: Copper or Plantinum Spark Plugs?

Post by jim g » Fri Oct 21, 2016 9:42 pm

The Pertronix system puts out the same voltage as points do. So you want to use copper plugs. Platinum plugs are for higher energy systems.

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