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Bosch spark plugs
https://www.ausmini.com/forums/viewtopic.php?f=2&t=37263		 Page 1 of 1
Author:  Monster Mini [ Wed Oct 31, 2007 11:06 am ]
Post subject:  Bosch spark plugs
Hi, does anyone know the difference between the Bosch WR7DC and the bosch W7DC.

I have had the W7DC in the mini but not the WR7DC are they a higher perforance plug?

Cheers
Author:  doogie [ Wed Oct 31, 2007 11:15 am ]
Post subject: 
Probably just a different heat range between the 2 plugs at a guess.

Doogie
Author:  Anto [ Wed Oct 31, 2007 11:15 am ]
Post subject: 
I think one superceded the other and that they are interchangeable. I think the R has something to do with resistance?

They are the same heat range (equivalent to BP6ES NGK)
Author:  DOZ [ Wed Oct 31, 2007 11:25 am ]
Post subject: 
The R is usually for a resistor type plug

http://www.ngkntk.co.uk/technicaltips/resistorplugs.asp

Daniel
Author:  64cooper [ Wed Oct 31, 2007 8:24 pm ]
Post subject: 
W=14mm
R=resistor type-runs with suppression resistor
7=heat range, hotter
D=thread length
C=copper anode, single
Author:  drmini in aust [ Wed Oct 31, 2007 10:00 pm ]
Post subject: 
I'd run the Rs if you have copper wire leads, but in all other cases stick with the standard type if you can get em.
Resistor plugs are designed to eliminate interference to onboard electronics in modern cars. But they have far better ignition systems than we do.

I had trouble recently with plugs in my (1977) Evinrude outboard- I fitted 3 new QL77JC4 resistor plugs (boat shop says are the current recommendation) and it wouldn't even get on the plane!. :x I refitted the old standard type L77JC4 ones, and away we went.... 8)
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