Originally Posted by
Mazda614
Anyone know what causes the bottom part of the piston to breakup. We had two engines one week apart where the piston has broken the skirt all the way up to the bottom of the piston pin. The rod was damaged but still in one piece. Both engines a Nova's, one a 353 and the other a Flash .12. Both engines were running OK and slightly rich as opposed to lean. Both about 18 months old but in good condition and running well before the failures.
i have dropped the skirt off 2 pistons both 353 and flash.
i run at brendale
first one the bearing in the lay shaft dropped causing the second gear to move on the back straight OVER rev .. dropped skirt after 2 runs
the second was stripped 2nd gear at the end of the back straight . broke it the following run
this is just my experience
peter