cracked plugs

[93 White Shark]

my plugs in the vr keep cracking.
What the hell is going on??

[DeiCide]

r u doing them up to tight?
1 quarter turn after hand tight.
Check if their the right spec.

[kopper69]

What DeiCide said. Cant think of any other reason. Its not voltage or heat it would have to be mechanical stress.

[hako]

It is generally caused by not keeping the sparkplug socket (or tube spanner) straight on the plug when in stalling or removing - if the angle is not correct the walls of the socket press against the porcelain insulator and crack - doesn't take much to break them. The plug socket must be in a straight line with the plug. The porcelain is about as fragile as your grandmothers china.