Spark Plugs

[A7 OOH]

Am I correct in assuming that the best plugs for my 1.8 K series 140hp X Power are BCP7ES set at 0.8mm. Road use only.

Or are other options.

Thanks

[Jonathan Kay]

I trawled the advice for my 1998 K 1800 nonVVC earlier this year and bought:

NGK Spark Plug BCPR7ES (3330)

Jonathan

[revilla]

I think the"R" is only strictly required for wasted spark but doesn't do any harm on others.

[Jonathan Kay]

What Andrew says.

And the preset gap was right for the engine.

Jonathan

[A7 OOH]

Thanks.

Great to have my thoughts confirmed

Gordon

[revilla]

Just to add, on my 1.8 VVC I had a problem with an intermittent misfire recently. Convinced it was a plug misfire I swapped to another set of 7s and it made no difference. Further convinced that it only happened when the plugs would be running at their coolest (after a long overrun coast to a junction or when the engine hadn't warmed up) I swapped to BCPR6ES and the problem has never been seen since. They might be a bit hot for hard track use though, mine is road only and I think the engine was just telling me I don't drive it hard enough!

[aerobod - near CYYC]

Under low load conditions with ambient temperatures below 20°C, I get slight misfires with the BCPR7ES plugs set to 0.9mm gap on my R400D. A quick thrash of the car will clear it. I’ve tried half a dozen “6” temperature plugs from NGK, Champion and Autolite, all can misfire under heavy load on the track or at autocross, so I’ve not found an ideal plug for all use cases.