6 replies to this topic

[steve and tina]

I have a 1983 Mayfair but the engine has been changed at some point to an A+ 998cc

I have today replace my plugs leads cap etc and noticed the plug I was given toay are different to the ones I took out

The car was running with NGK BP6E S

But I was sold today NGK BPR6E

Question is does the S make any difference or am I worrying over nothing

Thanks Steve

[L400RAS]

I think the more important part is the R after the "BP", this stands for resistor. Do you know if you have a ballasted coil....?

[steve and tina]

I think the more important part is the R after the "BP", this stands for resistor. Do you know if you have a ballasted coil....?

No sorry no idea is there an easy way to tell which is which

[Dan]

It doesn't matter anyway, resistor plugs are nothing to do with ballasted ignition. Resistor plugs have RFI supression built into them.

The S means it has a standard end configuration (2.5mm copper core, single ground electrode). I can't imagine why new plugs would not have a code for the sparking end.

The B means it's the same thread and socket size, the P means it is a projected nose plug, the 6 is the heat rating (right in the middle of the range) and the E refers to the reach of the thread.

[steve and tina]

It doesn't matter anyway, resistor plugs are nothing to do with ballasted ignition. Resistor plugs have RFI supression built into them.

The S means it has a standard end configuration (2.5mm copper core, single ground electrode). I can't imagine why new plugs would not have a code for the sparking end.

The B means it's the same thread and socket size, the P means it is a projected nose plug, the 6 is the heat rating (right in the middle of the range) and the E refers to the reach of the thread.

Thanks for the info very interesting

[taffy1967]

My 1990 Mini Cooper has electronic ignition and therefore I use NGK BPR6ES spark plugs, because I'm told the 'R' stands for resister which is suitable for cars with electronic ignition and that resister stops interference on the radio/stereo.

I can't imagine it'd do much harm to a Mini with points and a condenser, but you may get a weaker spark as a result?

Oh and a 1983 Mini Mayfair would have been equipped with an A+ engine as standard.

[Sherlock]

My 998 runs on Champion N7Y or RN7Y, ('R' meaning resistor) it makes no difference to the performance or emission readings so everything must be burning ok, as Dan said it is just a built in suppressor, I suppose ideally you could run them with copper core HT leads.