2 replies to this topic

[mini_nutz]

Hello,

Recently i have been working on my 1971 1.4 mini when i came across two NGK spark plugs where the ceramic insulator has failed. I have never had this happern b4, i have only heard of it when people use the cheaper spark plug sockets and extension bars to remove them and slip.

I was wondering if it may b to do with the 11.5:1 compression ratio??

These are the NGK BP6E plugs although i realise that with the hight the compression the higher the heat rating on the spark plugs need to be. As this is a weekend car i wouldn't have thought this would matter.

Can anybody help?

[cowboy]

in my opinion these just look like a faulty pear. the high compression wont matter too much. not much else on the plug seems to have melted.

how long have the plugs been in?

[Sprocket]

Nothing to do with compression

It looks like they have been broken in the plug socket or they have been knocked. I have done it myself before now even with the correct socket!!