Spark Plug #s

[mr.niftie]

BR9-ES, BR9ECS, & SDIBR9-ECS SDI.
All with different part #'s.
Anyone know what the difference is???

[rob7374]

Here's NGK info:
http://www.spark-plugs.co.uk/pages/technical/ngkjpg.htm

As you can see the ES is the standard copper core and the ECS is the short, angle ground electrode. As for the difference between the regular BR9ECS and the SDI version is the plug gap. NGK claims you can not safely regap these plugs. If you try you risk the electrode breaking off while in use. Not good. The SDI version comes pregapped at .031 while the regular I believe is .018. For the record I run Champion RN57YC's in the 04 600H.O. with no issues. They're much cheaper too.

[mr.niftie]

Thanks!

Here's NGK info:
http://www.spark-plugs.co.uk/pages/technical/ngkjpg.htm

As you can see the ES is the standard copper core and the ECS is the short, angle ground electrode. As for the difference between the regular BR9ECS and the SDI version is the plug gap. NGK claims you can not safely regap these plugs. If you try you risk the electrode breaking off while in use. Not good. The SDI version comes pregapped at .031 while the regular I believe is .018. For the record I run Champion RN57YC's in the 04 600H.O. with no issues. They're much cheaper too.
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