Show whole topic Aug 22, 2016 6:54 pm
bill Offline
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Registered since: Jun 08, 2011
Location: -


Subject: Re: Suitable Spark Plugs for 16/80?
Just to clarify my earlier post on 18th August and Laurence's above. Yes it seems to be correct that with NGK there is nothing between 2 and 6 for 18mm plugs. I was not aware of this.
I have also checked with the friend I mentioned above who has the pre war BMW. He is in fact using NGK 4 not 5 ! He is using 14mm plugs with an insert not 18mm. He is doing about 50 miles to a pint of oil (burnt not leaked) and does not have a misfire !
He drives very hard !
I think that with modern fuels we can probably use softer plugs than we thought we could !