Post by
GarageGuy »
https://forums.nicoclub.com/garageguy-u218314.html
Thu Jun 20, 2013 10:00 pm
If an engine is ran hard enough, detonation and pre-ignition can blow it. But retarding/advancing the timing wrong is when a new hole in the block can occur. If the valve is still open (pushed into the cylinder) when the piston comes back up bad things will happen. May not be an instant thing but its a time bomb. Piston tags the valve, valve eventually breaks from stress, said valve is now in cylinder and destroying piston, once piston is gone con rod is etxhing the cylinder wall until it falls into the crank case and binds up, once that connecting rod gets into a place that wont let the rotating assembly turn either the crank breaks into two separate pieces or you have a new hole in the block.
Someone double check me with this, i know this is what happens on a v-type motor. Pretty sure it would be the same though.