mk1-forum.net

hi

is the NGK BP5ES the correct plug for a std Cooper 998? Champion N5 was original fit but not sure which is the best 'modern' equivalent...?

I find stuff starts & runs better on a BP6ES

M

Champion N9Y (N9YC, N9YCC Copper Core versions) is a good alternative. It was used by BL in 998s and the Cooper S models.

N5 translates to a B6ES

Later on they went to the projected tip, noted by the “P” in the BP6ES. I’ve got some “unprojected” tip plugs to try but I haven’t had a chance to see them running yet. They are recommended by swiftune & KAD

In terms of heat range, 6 is a good place to start. 7 is a bit cooler for higher compression or boosted engines. 5 is a bit hotter, so it can help to burn oil if you have a worn engine

A colder plug will tend to foul easier and a hotter plug can cause irregular ignition events and run on if they stay really hot

Thanks both… some options there

In the past would of gone for a Champion N9Y, we thought it was an upgrade to the earlier spec`d N5s.... but these days only consider NGK.

NGK seem more reliable and better choice of specs...I would go with Mark (BP6ES) on standardish car and go for a BP8ES (bit cooler) on anything likely to get a continued thrashing.

Amazes me how cheap plugs are these days even quite fancy ones - back in the day we seemed to spend, proportionately, much more, especially on two stroke bike plugs...

Another vote for the NGK BP6ES here, always seem to work well on a standard(ish) car.

mk1 wrote: ↑Fri Aug 12, 2022 3:55 pm I find stuff starts & runs better on a BP6ES

M

yep, i have also these

Thanks everyone… with the variable quality of stuff these days it’s good to get a recommendation…

surfblue63 wrote: ↑Fri Aug 12, 2022 5:14 pm Champion N9Y (N9YC, N9YCC Copper Core versions) is a good alternative. It was used by BL in 998s and the Cooper S models.

The 1071 models used the N5 plugs until late 63

The 1071 models used the N5 plugs until late 63

1071's initially used Champion UN12Y plugs up to engine number 28431.

Mine ran better on Champion N5 or N5C as they now are rather than the NGK alternative

whitewithblackroof wrote: ↑Thu Aug 18, 2022 1:46 pm Mine ran better on Champion N5 or N5C as they now are rather than the NGK alternative

Always ran mine on N5's with no problems either.