Spark plugs - NGK BP5ES vs NGK BP5E

[Paul99]

I notice on the NGK website it suggests the E is a "better" plug than the ES.  Same heat range and fitting etc, and they seem to cost a bit more.

I have used BP5ES and I believe the technical manual suggests ES but interested in the difference in performance/use if any between an E and ES plug?

NGK suggest the V shape centre of the E plugs will help with running.
 
Any thoughts?   

[Shvegel]

Are you sure there is a BP5E?  5 is the heat range and E is the length of thread or in this case 19mm.  Anything after the E is the firing end construction with S being a standard electrode.  BP5EE perhaps?

[WRe]

Hi,
attached the "How to read our part number: Spark Plugs" from NGK or here: https://www.sl113.org/forums/index.php?topic=30874.0 .
...WRe

[Paul99]

The NGK website shows the BP5E as the same size exactly same thread etc but says of the BPxE plugs

Spark plugs with V-groove in the center electrode
The principle of NGK SPARK PLUG’s patented V-grooved spark plugs is technically simple but very effective. A V-groove is situated in the center electrode. This forces the spark to occur at the outer edge of the center electrode where it is easier to ignite the air-fuel mixture. In addition, the voltage required to produce a spark is reduced. These two features give the benefit of improved ignitability, especially in modern low-emission lean-burn engines, even under extreme operating conditions.

But I guess not really suited to our engines.