Running a hotter plug......???

[Ranger 6]

I've had a look round at what plugs I should have in the V8 and have seen places like V8 Developments recommend BP6ES as a standard plug.

I pulled the plugs to have a look at the state of them and was quite impressed at the colour, however they are BP5ES which appear from a bit of research to run hotter than the 6.

What to people run in the Rover V8 as standard? Is the BP5ES a wrong-un and should I change? - It's running fine and the plug colour is good.

[Grindle]

I ran 7s Iridium in mine and the car was better on fuel slightly and pulled smoother. 5s seem a bad idea but i have always erred on the colder side with plugs, on bikes and cars with no issues to date. Road and race.

[Grindle]

Thinking about it if you do mostly town work, 5s might be fine. But i wouldn't drive hard with them in myself.

[Ranger 6]

It's in a Land Rover and I do plan to do some events in it so will switch to a 6 I think. It's completely standard but will be worked hard so a hot plug could do damage.

[Ranger 6]

Anyone else?

[Stan Weiss]

It really does not matter what others are running. If you know how to read the spark plugs the engine will tell you if the spark plug that is in it is to hot, or to cold, or just right.

Stan

[Boosted LS1]

5 is for stock engines and 6 is better as a precaution for slightly tuned engines. If the 6 isn't fouling and cold starts work then it's ok. If the 5 is showing signs of excessive heat on the earth strap or porcelain then change up to a 6. For a daily driver I doubt you'd notice any significant changes.

[GreenV8S]

B7ECS was recommended for the 4.6 in a TVR - don't know whether that also applies in an RR.

[Boosted LS1]

I used to use BP7 something or other on my turbo engine and iirc they were fine.

[Ranger 6]

Stan Weiss said:

It really does not matter what others are running. If you know how to read the spark plugs the engine will tell you if the spark plug that is in it is to hot, or to cold, or just right.

Stan

I shouldn't have looked on line. Just pulling the plugs showed a good colour on them - back in they went!!