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914World.com _ 914World Garage _ Spark plugs

Posted by: Ray Warren Mar 5 2004, 07:20 PM

I read an earlier post about spark plugs and Brad
had mentioned that they use Bosch W7DC.

I picked up some W7DC plugs today but the electrode seems to protrude farther than the W7CC plug.
What should I gap them at?

Posted by: Ray Warren Mar 6 2004, 10:08 AM

Has nobody ever gapped there plugs?

Posted by: weird_looking_cactus Mar 6 2004, 10:12 AM

Im not sure but I gab mine at .28

Posted by: McMark Mar 6 2004, 01:29 PM

My car with Pertronix ran at .050".

According to the Bosch Spark Plug Application Guide the spark plug code breaks down as follows:

W - 14 mm threads
7 - Heat range (2 = coldest, 11 = hottest)
D - Thread reach 3/4" (0.708" with tapered seat) Extended Tip Electrode
C - Copper core spark plug

W - 14 mm threads
7 - Heat range (2 = coldest, 11 = hottest)
C - Thread reach 3/4" Regular Electrode
C - Copper core spark plug

Posted by: Brett W Mar 6 2004, 05:01 PM

THrow the bosch plugs away and get some NGK B7ES or maybe a B6ES depending on temp, engine setup and driving style.