Thread: Twin Plug DIY?
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David David is offline
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Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,775
I figured out what my confusion was. The hole for the 1st plug is closer to the exhaust side head studs, so my idea of lining up on the 1st hole and rotating the head about the head stud center would put the 2nd hole about 1/2" or so off alignment with the 1st. Now I understand why the 2nd hole recess is closer to the exhaust side stud recess.

On a side note, I picked up a 12mm plug out of curiousity. I bought an NGK, maybe others are different, but the porcelein is smaller than on the 14mm plug so I'd be concerned that a standard size plug wire boot would not seal out the elements.

Since I'm an amatuer machinist (I have made some intricate precision parts though), I alway consult with the pros at work and one recommended putting clay between the fins when machining to prevent damage. Another thought it wouldn't be a problem with mill at an angle, but I'll air on the conservative side and wedge some rubber between the fins.
2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)

Last edited by David; 07-08-2004 at 08:11 PM..
Old 07-08-2004, 08:01 PM
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