18mm sparkplugs

[Dave Williams]

-> Why did Ford use 18mm sparkplugs in 'late-model' engines, when pretty
-> much no-one else did?  Not a trick question, I am curious.

 In the SAE paper on the German-designed 2000 OHC 'Pinto' engine, Ford
said they went from 14mm to 18mm plugs because the 14mm plugs had a
tendency to foul when the engine was operated for very short periods of
time, as in when driven on and off the transporters and in the dealer
lots.
                                       
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