Spark plug confusion !!

[HJG-E30]

I've just pulled some fancy Bosch super 4s from my engine, as the previous owner had them fitted.

I've purchased some NGK BPR6ES plugs but they are noticably longer than the Bosch that were in there! Are these going to cause problems?!



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[baptie0]

what engine does your car have? dont worry about what was fitted before. use the ones specified for your engine.

[HJG-E30]

M20 B25

[bilun777]

Those bosch plugs are wrong, and will have been partially shrouded by the plug hole. It will run better on the ngk's.

[HJG-E30]

The HT leads won't fit over the new plugs! Do i have to remove the tip ?!

[superkully]

You do

[HJG-E30]

All fitted, seems to be running exactly the same (well), let's see if MPG improves!