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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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WR7DC vs WR6DC
When I pulled the plugs in my 79 motor it had WR8DC, but I am thinking the stock plug for all the 16v motors is the WR7DC. WR6DC seems to work for some people as well, any opinions?
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03-02-2008, 08:20 PM
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not-banned
Join Date: Jan 2004
Posts: 78
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Run the coldest plug you can without fouling.
WR8DC is listed as the correct plug for OB's in some places. Porsche switched to 7's with the 4.7 and kept the same heat range through the GTS. I've been running WR6DC plugs for a while now under boost with no issues. I'll be installing 5's this spring, see how that goes. Last edited by hacker-pschorr; 03-03-2008 at 10:13 AM.. |
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03-03-2008, 06:46 AM
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not-banned
Join Date: Jan 2004
Posts: 78
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Sorry rogue, I had no idea where that pan (or the picture) came from.
Just one of many pictures on my computer of busted up 928 engines I've "collected" over the years. |
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03-03-2008, 07:36 AM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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******** has plugs for I think $1.35, so I was thinking of getting some of almost everything.
I wonder if Porsche didn't use the hotter plug to stay away from intake oil issues fouling the plugs? |
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03-03-2008, 08:18 AM
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not-banned
Join Date: Jan 2004
Posts: 78
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Quote:
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03-03-2008, 09:45 AM
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Registered
Join Date: Aug 2006
Location: Cincinnati, Ohio
Posts: 1,019
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I run heat range 5 in the turbo cars. For NA I would stick with 7 and stick with copper or silver electrode. Platinum's only advantage is its life.
__________________
Kuhn Performance Technologies, LLC Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane. Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane. |
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03-03-2008, 08:03 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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My engines are a stock 84 Euro S, and a stock US 83 S. The Euro has a fresh set of WR7DC plugs, not sure what or how old in the US 83.
Colder plug on the Euro S I am thinking might allow a bit more advance running the 91 octane gas thats as good as it gets in Calif. BTW whats with silver, sounds goofy for a spark plug? |
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03-03-2008, 08:23 PM
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Registered
Join Date: Aug 2006
Location: Cincinnati, Ohio
Posts: 1,019
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Silver is one of the best conductors...platinum has a lower thermal and electrical conducivity than silver or copper. Copper is the best bang for the $.
__________________
Kuhn Performance Technologies, LLC Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane. Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane. |
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03-03-2008, 08:57 PM
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