Colder plugs?

[DuncanM]

Hello,

Reading the forums, a fair few AJP8's have been lost to detonation after they have been remapped.

Has anyone tried using colder plugs?

NGK BKR5EKU is what I'm using at the moment, you can get BKR6EKU or even BKR7EKU.

Any opinions for or against trying colder plugs?

Regards

Duncan

[ridds]

Or, the person mapping it could just map it correctly with the correct compensations for coolant temp, air charge temp and fuel grade.

Also the owner needs to be aware that if you have your car mapped to the "limit" you need to be wary about fuel grade, ambient temp, oil levels etc etc etc when giving it beans.

If you increase the heat range you could induce cold start issues due to plug fouling.

[DuncanM]

ridds said:

Or, the person mapping it could just map it correctly with the correct compensations for coolant temp, air charge temp and fuel grade.

Also the owner needs to be aware that if you have your car mapped to the "limit" you need to be wary about fuel grade, ambient temp, oil levels etc etc etc when giving it beans.

If you increase the heat range you could induce cold start issues due to plug fouling.

Sure, perfect mapping is the ideal.

I am just interested as to whether anyone has tried colder plugs?

And the pros and cons?

Duncan

[Brummmie]

DuncanM said:

Hello,

Reading the forums, a fair few AJP8's have been lost to detonation after they have been remapped.

Has anyone tried using colder plugs?

NGK BKR5EKU is what I'm using at the moment, you can get BKR6EKU or even BKR7EKU.

Any opinions for or against trying colder plugs?

Regards

Duncan

Its too much ignition timing at around peak torque, plugs wont cure that.

[DuncanM]

Thanks for the reply Paul.

Any reason why people shouldn't run with a slightly colder plug?

Duncan

[spitfire4v8]

DuncanM said:

Hello,

Reading the forums, a fair few AJP8's have been lost to detonation after they have been remapped.

Has anyone tried using colder plugs?

NGK BKR5EKU is what I'm using at the moment, you can get BKR6EKU or even BKR7EKU.

Any opinions for or against trying colder plugs?

Regards

Duncan

Which engines?

[Brummmie]

DuncanM said:

Thanks for the reply Paul.

Any reason why people shouldn't run with a slightly colder plug?

Duncan

They foul easier, especially if you move it in and out the garage alot, or whatever..

I found this in my LS engine, i reverted back to standard grade.

[DuncanM]

Thanks Paul, I'll stick with the standard ones.

Spitfire, I am not great at searching the forums. But there was a thread discussing AJP8 tuning and a couple of people mentioned that chasing bhp and running the engines lean can make them less reliable/prone to det and HG failure.

And this:http://www.pistonheads.com/gassing/topic.asp?h=0&t=1080147&hw=+%2Bdetonation&nmt=Decisions%20decisions%20and%20non%20of%20them%20nice

I don't have specific failure information other than that.

Regards

Duncan