8 replies to this topic

[Mei]

right just wondering what the hottest plug i can safely run on 8.5 compression ratio 1100....
cheers guys.

[liirge]

Well i know that in the NGK sparkplug world, the lower the number the hotter the plug, so
BP6ES are cooler than BP5ES
if your running BP6ES as a standard mini plug, and want warmer order BP5ES...
but i don't know how much each number means, as in to what degree of heat the number dictates, thats quite a low Compression ration unit there so would imagine you can run a hotter plug than alot of people.
any reason why you want to do this?

[Mei]

I'm burning oil badly, well not burning its wetting my plugs causing them to stop firing....so an old trick i know is to increase the heat of the plug to stop this from happening.
I'm currently using BP5ES

[liirge]

Yeah i know of that little trick as well i believe someone on here is using non standard mini plugs to deal with his weber fuelling issues.. but i just can't remember who.

[Wil_h]

Can you even buy cooler plugs than 5s?

I would safely say you could run any plug of the right size with no chance of danaging anything other than the plug.

[liirge]

Will, Any plug number above 5 is cooler...so 6's 7's 8's are cooler plugs.
I believe you can get as hot as BP2ES.

[MRA]

BP2ES are available......... not sure what application though ?

[Wil_h]

Always confuese me, but interesting that 2s are available, but not from halfords I'm sure

[Ethel]

You're talking about 2 things hotter engine - cooler plug, hence the amguity. Electronic ignition and wider plug gaps might help as well.

Always confuese me, but interesting that 2s are available, but not from halfords I'm sure