Which Bosch Spark Plugs for SC
12-03-2006, 02:02 PM
#1
Burning Brakes
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Which Bosch Spark Plugs for SC
I've searched, but I can't really find the answer to my question.
Which Bosch spark plugs are the correct ones for an 83 SC?
My Bentley manual says WR7DC or DP (copper/platnum).
But on Paragon or Pelican Parts it looks like those are for the 3.2 (84 and up).
And the correct ones are WR5DC+.
Can anyone confirm which ones are correct?
Which Bosch spark plugs are the correct ones for an 83 SC?
My Bentley manual says WR7DC or DP (copper/platnum).
But on Paragon or Pelican Parts it looks like those are for the 3.2 (84 and up).
And the correct ones are WR5DC+.
Can anyone confirm which ones are correct?
12-03-2006, 06:11 PM
#2
RL Technical Advisor
Matt:
You can use either WR6DC or W6DC. I'd use W5DC's if you do a lot of track events. These are all copper plugs; the "R"version has a resistor that you really don't need since the connectors have the RFI suppressors in them.
Stay away from the Bosch platinum plugs.
You can use either WR6DC or W6DC. I'd use W5DC's if you do a lot of track events. These are all copper plugs; the "R"version has a resistor that you really don't need since the connectors have the RFI suppressors in them.
Stay away from the Bosch platinum plugs.
12-03-2006, 06:33 PM
#3
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The Bentley Manual is incorrect, Porsche changed the heat range of the 911SC spark plug when they raised the compression ratio. The correct plug is a WR5DC. There are several other errors in the Bentley manual, especially in the Lambda CIS function and testing.
