Yesterday, 10:15 AM
Reduction in quality used to happen with OE Champions too, back in the pre-PRC manufacturing days on some of our stuff.
The taper seat ones that went in the V8 Clevelands used to randomly short out under acceleration up inside the shell where the seal compound between the insulator nose and the metal body was, which meant no spark at the actual gap.
It was good insurance against an angry owner to 'proof test' the brand new set you were going to fit, using the pressurised chamber and HT buzzer on the workshop spark plug machine. Not strictly a real world test, but anything that showed the slightest sign of activity outside the official spark zone was certain to cause a misfire in the engine.
The taper seat ones that went in the V8 Clevelands used to randomly short out under acceleration up inside the shell where the seal compound between the insulator nose and the metal body was, which meant no spark at the actual gap.
It was good insurance against an angry owner to 'proof test' the brand new set you were going to fit, using the pressurised chamber and HT buzzer on the workshop spark plug machine. Not strictly a real world test, but anything that showed the slightest sign of activity outside the official spark zone was certain to cause a misfire in the engine.