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#1
28-01-10, 21:13
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Just looked in the NGK book for a cross reference, but I can't find a WC7D. They cross reference Bosch W7D and a WR7D, but that's as close as it gets. Does anybody know what the "C" in WC7D means? Obviously the W7D is non-resistor type and WR7D is resistor type, but what is a WC7D? Copper core? Any Bosch plug experts out there?
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#3
30-09-11, 08:07
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W = M14 x 1.25mm = 20.8mm across flats
C = Waterproof for shielded ignition cable, 7mm dia. 7 = Mid heat range D = 19mm thread depth, flat seat with washer, centre electrode protrudes 3mm. 0.7mm standard plug gap Resistor type Standard style electrodes 5/8 terminal type Chrome-nickel centre electrode
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David Toyne 1945 US6 1943 F60S Trucks, tractors and steam engines ...... http://www.youtube.com/watch?v=ETRf5tiptg4 Last edited by US6; 30-09-11 at 10:44.
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#4
30-09-11, 15:52
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There was a point in time around 1989 when we could not get the original Bosch spark plugs and in an emergency would use the old SMP spark plug like the 2243. Despite the short reach they worked, however we changed them back over to the Bosch as soon as new stock was received.
I just had a look at Rock auto in the US: the Bosch plugs are available there but at a cost of around $25 a plug. Wow.
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