Comp 918 failure caused #6 piston to disenegrate :(

Well I took off work yesterday to tear my motor apart and found the #6 exhaust valve spring broken, then once i got the head off I looked doen in the block and where a piston is supposed to be i found one chunk about the size of a chicken nugget the rest were so small they fell into the oil pan im assuming. When it happened it completely chewed up the head and ate the spark plug. looking down in the cylinder hole u can see that it chewed up the crank and the cylinder wall was demolished.

Well my dad said take this negative and turn it into a positive..
Hello reman longblock LQ9!!lol

Looks like I might need to expedite my order to replace my 918s.. lol. what color was the stripe on the side of the comp spring?

Yea dude i would def get something else! And these were supposed to be the new revamped ones wit no problems. Man I dont remember, but now there isnt one on them, for some reason i think maybe pink or purple but i could be completely wrong Luke(408luke) may remember i got them from him

i think the old color was blue, but these were the new ones because i remember sending the old ones to comp and as soon as i got the new ones i sent them to you. Oh well i guess lq9 time :D have you thought about a 370? or at least going with forged rods and pistons? be careful who you get that reman from, i would be worried about bearing clearances and such especially since you spray. Is my cam still good? :lol: if not you can go even bigger now :devil:

Well right now $ is pretty tight (thanks to college.lol) so for now i think im just gonna put the motor in and drive it. I image a full bolt on lq9 will embarese the ol cammed out 4.8 any day of the week, just cuz of the amount of torque. i havent torn it down that far yet but idk if i will use anything out of this motor. Im thinkin bout turnin the cam or crank into a lamp stand for my living room.lol

Same thing happened to me, except mine were the "new and improved" 918s...sucks, but creates a new oppurtunity! good luck

Post some pics dude. BTW, your package should arrive today :)

How many miles were on them? I still stand by my belief that any performance valve spring (especially duals) are only good for 15000-20000 miles.

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Originally Posted by Frenchy

How many miles were on them? I still stand by my belief that any performance valve spring (especially duals) are only good for 15000-20000 miles.

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That's it? That means you should change them on a yearly basis, atleast.

How long do you let truck idle before driving it?