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Join Date: Jul 2009
Posts: 55
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A quick spark plug question please....
I am currently rebuilding my 1984 3.2 L engine due to a broken #6 intake rocker arm. The spark plugs that were in the engine for the last 10 years or so are the bosch super w6dc. They worked very well and look fine.
I have made changes to the engine ...I replaced the USA Pistons with the Eurostyle ... and I have replaced the stock camshafts with the WebCam 20/21 profile timed at 2.05 mm at TDC overlap.... I have a stock ignition system. My compression ratio is now supposedly 10.3. Up from the 9.5 compression ratio previously I have noticed that the Bosch W6 DC spark plugs are not readily available. Some British eBay sites have them but not our host pelican parts. I really don't have much experience with various spark plugs....I want to stay with the Bosch brand And copper....what spark plug would you use in my situation considering I upgraded the compression ratio? thank you |
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06-20-2012, 09:01 AM
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Join Date: Jul 2009
Posts: 55
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Perhaps a moderator can point me in the right direction?
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06-21-2012, 06:56 AM
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Join Date: May 2003
Posts: 3,346
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Just Google "Bosch w6dc spark plug equivalent" (but spell it correctly). I saw several options that I'm sure are available at the local auto parts store. I use NGK myself. The closest would be wr6dc from Bosch. They are same except they have a resistor for EMI suppression. They will work fine.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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06-21-2012, 12:30 PM
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Posts: 55
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Thank you for responding!
I guess the next question Would be....do I want equivalent plugs to what I was running before? Since I have raised the compression ratio...I was under the impression I need a colder plug....is this accurate....? Basically I'd like to know what Bosch plugs people are running here with the euro spec 3.2 liters.... |
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06-23-2012, 09:33 AM
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Join Date: May 2003
Posts: 3,346
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I use NGK BPR8ES spark plugs. They are copper resistor plugs and are 2 steps colder than the Bosch W6DC. If you want Bosch, you could use W5DC or W4DC. I have a euro 3.0 engine in a race car.
I would use the colder plugs with your new engine. If they are too cold they will "carbon up" after a few thousand miles. If they do you can go back to the hotter plugs. -Andy
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72 Carrera RS replica, Spec 911 racer |
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06-23-2012, 04:25 PM
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