Spark Plugs

·         Gerry

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Manual calls for NGK D9EA plugs. Is there an NGK Iridium equivalent that is approved for use?

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·         Doug Smith

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Hi Gerry,
The iridium versions are resistor plugs and historically have not been approved because of the potential drop in performance during engine starting. To my knowledge they've never been back to back tested on the dyno tp verify performance either. I did run them in my experimental jabiru for a while but eventually swapped back to the normal ones - I found keeping their thread clean a bit of a drag and didn't pick any performance difference.
Regards,
Doug.

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·         Gerry

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Thanks Doug