jak2908

iTrader: (1)

what would cause that to break??? on a boosted car of only 5 psi?

LS1-450

iTrader: (33)

Over tightening or a miss-aligned socket pushing against it while tightening. Could be boost related, maybe.

jak2908

iTrader: (1)

im talking in the combustion chamber..the white insulator tip by the electrode

LS1121

iTrader: (17)

A defective Plug. A Very small possibility of something flowing thru the intake system into the cylinder and out the exhaust.....but highly unlikely. Over 40 years and I have never seen a broken tip.

jak2908

iTrader: (1)

i put a new plug in after that and it still didnt fire on that cylinder...took the plug out and held my finger over the hole and it spit oil and gas on my hand

LS1-450

iTrader: (33)

OK, miss-understood where it had broken.


I'd check compression on that cylinder. Could be that a broken ring-land hit & broke it...or something damage related in the area of the combustion chamber.

Could be leaky valve stem seal, damaged valve, piston, rings...

Sounds like you'll be pulling the head.

jak2908

iTrader: (1)

its just strange because nothing else on the plug is damaged..the ground strap isnt even touched...and where the insulator tip is broke its broke about 3/16" down

mel88643

Had this happened twice to a race motorcycle we had a few years back,dismissed this as a bad plug. Found out it was preignition after it had nawed the front of the piston above the rings on a tear down.
Its possible its happening to you too. Hope this helps.
Good luck...

jak2908

iTrader: (1)

Got a video stick in the cylinder....edge of the piston is chewed up and gone

LS1-450

iTrader: (33)

Sorry, to hear it. Good-luck as you get her fixed.