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David David is offline
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Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,690
I went with the 12mm lower plug. The smaller plug requires less material removed to unshroud the plug tip so compression is a little higher. I hate to admit, but probably the big underlying reason was that I did the machining myself so if any mistakes were made, I could go up to the 14mm plug. I haven't had any problems with the smaller plug and they seem to be burning the same color as the upper plug.
2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)
Old 12-08-2007, 05:20 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #14 (permalink)