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NGK Plugs for Duratec in current 360R


Q Catcher

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I would say TR6AP-13, but possibly reducing the gap to 1.0mm (see below).  By the way, my local Ford dealer says these plugs are good for 60K miles!

As mentioned in JK's second link above, my R400D started life with Ford's own FoMoCo TR6AP-13 plugs (made, I think, by NGK).  On the advice of Steve Greenald, I moved to NGK BR7EFS (pre-set to 0.65mm / 25 thou) gapped to 0.9mm (37 thou).

About a couple of years later (2019), I reverted to the FoMoCo plugs as I was suffering from stalling when cold and a bout of misfiring.  At the same time, I reduced the gap from 1.3mm to 1.0mm in an effort to reduce voltage stress on the coil-on-plug following a COP failure in France.  

The car has run impeccably ever since -- no misfires, no stalling, no more COP failures.  Make of that what you will!

JV

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