Volvo RWD 1800 Forum

INDEX FOR 2/2026(CURRENT) INDEX FOR 9/2009 1800 INDEX

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Need Help with NGK Numbering Convention 1800 1973

posted by  Chris Mullet on  Sat Oct 3 15:25 CST 2015
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last visit: Fri Oct 24 09:08 CST 2014
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Can anyone tell me the difference between NGK BP6ES and BP6HS? What do the "E" and "H" stand for? Thanks.








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Need Help with NGK Numbering Convention 1800 1973

posted by  Phil S. on  Sat Oct 3 17:17 CST 2015
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last visit: Fri Oct 24 13:18 CST 2014
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The E has a longer threaded length than the H. The E is correct for a B21/23/230, but will cause detonation in a B18/20 (if it doesn't actually hit the piston).

6 is the heat range -- higher numbers are cooler, lower are hotter. This is how much heat the plug dissipates, not how "hot" the spark is.

P means it has a projected tip -- the electrodes stick out further.

Not sure what the B or S means.








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Need Help with NGK Numbering Convention 1800 1973

posted by  Chris Mullet on  Sun Oct 4 07:03 CST 2015
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last visit: Fri Oct 24 09:08 CST 2014
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Thanks Phil. This is for the B20F in my 1800 which as you point out has a 1/2" thread depth. Upon further research I see the "H" plug has a 1/2" reach (makes sense "H" for "half") while the "E" has a 3/4" reach. Now if I can just find some locally.
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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (fixed the ignition - now back to the brakes again)







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