Car appreciation... the aesthetics, the engineering, etc

I never knew this was a thing! Makes sense though. Motorbike has two spark plugs per cylinder, when it's running with just one it's a bit shit, backfires, parps, stinks of fuel etc, not completely combusting, and thats on an engine that breaths ok, doesn't have any inheritant flaws. Not sure I can make both sparks face the right way though, will see!

I'd always though fuel/leaning out is bad but that incorrect spark or over energetic spark was a myth when it comes to piston melting.

Re: that link... I know there's logic behind it but if the direction of the earth shield on the plug was important Shirley there'd be a more precise method of placement.

A load of my mates were in to Banger & Hot Rod Racing 'The Bexley Suicide Squad' in Mick's Hot Rod the Ford Pinto lump had such high compression we painted a line on the ceramic in line with the electrode so when you put them in it had to face within the top half because if it faced down the piston tapped the electrode shut :)