2.5 280 spark plugs which ones ????

[lloyde]

i replaced the spark plugs with the ones marked on the front plate (see photo) and the engine would not run so put the old plugs back in and it ran fine but they are old and need replacing ,spoke to John GMC on here and asked what plugs he had in his 2.5 280 which were different to what it said on his front plate,his front plate said champion QL77CC which is what mine has in and runs . the question is what plugs are correct ??? thanks lloyd.

[still no worries]

You need NGK bpzbh-n
R. 10
Better than the champions
I use them in my 280
The r is under the NGK and the 10 is under the bpzbh-n

[lloyde]

did you mean NGK BPZ8H-n-10 ?

[Jay Smith]

I run the NGK BPZ-8H-N-10 gapped in ALL my 280 rebuilds gapped at .040".. That is now the suggested plug to run from Mercury Factory...

BTW: they run GREAT...

Jay

[lloyde]

Thanks Jay

[still no worries]

Originally Posted by lloyde

did you mean NGK BPZ8H-n-10 ?

Sorry yes

[FrenchPhil]

On my 2.4efi I run NGK BUHW's, is there a better gapped plug to use ?

Thanks

[Jay Smith]

Try the NGK BR9HS gapped at .040". If you need a hotter heat range try a
BR8HS gapped at .040", the'll work GREAT..

Jay

[Hydrostream]

Jay, whats the difference between the BPZ and the BR plugs I know ones a resistor and the other a suppressor, but which is better in the EFI motors?

[Jay Smith]

I think the R's is for a "normal" stator style ignition and will fire fine with that type of ignition. The Z's come on the newer style ignition that seems to be not so strong a flame and turn less RPM and don't need to recover as quick..

Jay