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Registered
Join Date: Mar 2019
Location: Saarland, Germany
Posts: 1,259
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Remember that the heat range numbering of NGK and Bosch spark plugs are opposite oriented. NGK: the lower the heat index the hotter the spark plug. Bosch and others are the opposite!
Refer to the manual or the Porsche tech spec book for further details on what your engine is best. W7DC seems to me the original recommendation from the user manual. There are cross reference tables available on the web.
E.g.
https://plugspecs.com/ngk-spark-plugs-cross-reference/#ngk-spark-plugs-cross-reference-chart
Following their information the BPR6ES is the 1:1 replacement for the W7DC.
Here's another chart showing the heat ranges of the vendors:
https://vasttuning.com/spark-plug-selection-and-spark-blowout/
Thomas
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1981 911 SC Coupé, platinum met. (former tin (zinc) metallic), Bilstein shocks, 915/61,930/16,WebCam20/21, Dansk 92.502SD,123ignition distributor with Permatune box as amplifier,Seine Systems Gate Shift Kit,Momo Prototipo. Want to get in touch with former owners of the car. Last registration in US was in 2013 in Lincolnshire/lL.
Last edited by Schulisco; 10-08-2024 at 09:00 AM..
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