pistons kissed valves :( are the pistons ok? (pics) [Archive] - DSM Forums: Mitsubishi Eclipse, Plymouth Laser, and Eagle Talon Forum: DSMtalk.com

: pistons kissed valves :( are the pistons ok? (pics)


axemurderer
07-14-2007, 08:06 PM
Well my buddies car snapped the b-belt that in turn didnt snap the timing belt but did jump enough teeth to fuck all the intake valves and destroy a bunch of rockers (it was a freaken warzone in there). I want to know if these pistons are ok to re-use.

He doesent have much money at all and since he's looking at about $500 already he would like to keep the pistons if possible. I think if we smoothed them out where the valves hit they should be ok but I need more opinions please:D .

Thanks.

http://i191.photobucket.com/albums/z53/dsmoverboosted/100_1737.jpg?t=1184461471

http://i191.photobucket.com/albums/z53/dsmoverboosted/100_1739.jpg?t=1184461537

http://i191.photobucket.com/albums/z53/dsmoverboosted/100_1738.jpg?t=1184461561

http://i191.photobucket.com/albums/z53/dsmoverboosted/100_1736.jpg?t=1184461587

boostboi
07-14-2007, 08:12 PM
looks just like mine a month ago and yes they're fine bust out a grinder and smooth it up and clean it off real well.

Arp head studs and the 4 layer mitsu metal gaskets and he's set.

420aboy
07-14-2007, 08:16 PM
Get some 600 series competition, I have broken a timing belt with them and never bent a valve.

aflawinhumanity
07-14-2007, 08:18 PM
After my engine blew I saw that the previous owner did the same thing. They redid the head and left the pistons with indents from the valves. It ran alright until it BLEW. It will cost more in the long run if you dont fix now. Partsdinosaur has oem pistons for $120. That's the least expensive I found.

axemurderer
07-14-2007, 08:38 PM
After my engine blew I saw that the previous owner did the same thing. They redid the head and left the pistons with indents from the valves. It ran alright until it BLEW. It will cost more in the long run if you dont fix now. Partsdinosaur has oem pistons for $120. That's the least expensive I found.

Well the only problem I could see in running these is maybe they would create some hot spots? I dont know for sure though. He is real tight on cash right now so I guess basically if there are any negetive effects with running these like this let me know and i (as his dsm advisor ;) ) would have to decide if the risk is worth it.

thanks :)

redhottalon
07-14-2007, 08:54 PM
Make sure there are no vertical scratches in the bores.
My 6bolt 4G63T was repaired before I bought it.
The piston tops did not look as bad as yours.
#2 piston had broken ring lands on the exhaust side and lost all compression after ~ 10K.
I am guessing that the inpact of the valves rotated the piston violently or it was just a detonation issue not related.
There was no metal between the top ring and oil ring.
Used TopLine parts to rebuild it.

axemurderer
07-15-2007, 12:44 AM
So if i grind the edges down they should be ok. I think as long as I smoothed them out where the valves hit they should be good to go since there not deep at all but its always good to get other opinoins.

Well I guess we'll just do that and I guess if something does go wrong with them than a used bottom end is pretty cheap.

oldman
07-15-2007, 01:20 AM
As long as the cylinder walls check out, there are nothing wrong with those pistons, I have seen worse.

axemurderer
07-15-2007, 01:24 AM
I was thinking the same. I did check the walls and I see nothing wrong with them. :)

90BlueGSX
07-15-2007, 02:22 AM
well at less your piston didn't end up looking like this. It's new job is paper weight.
http://i53.photobucket.com/albums/g64/4G63Attack/DSC00013.jpg

axemurderer
07-15-2007, 02:28 AM
well at less your piston didn't end up looking like this. It's new job is paper weight.
http://i53.photobucket.com/albums/g64/4G63Attack/DSC00013.jpg

wow thats a big valve you got in your engine to punch that hole in j/k. That engine must have been running out of fuel alot

Burnett03
07-15-2007, 04:19 AM
Just smooth away the rough edges and put er back together.. if he needs a head i have one laying around i can pretty much donate to him.. I mean 50$+ shipping.

diambo4life
07-15-2007, 04:28 AM
If you intend on pushing the car, I would recommend pulling the slugs and inspecting the ring lands too. Definitely debur the indents. Hot spots = recipe for pre-ignition.

empie1
07-15-2007, 10:26 AM
If he wants a cheap set of pistons..i have some..pm sent

Broken
07-15-2007, 11:26 AM
Take those slugs to your local machine shop and have them magnafluxed. If you take material off the pistons, make sure that you don't go too thin.

If you do take material off, then have your rotating assembly balanced.

If you can't afford to get them balanced, then weigh each piston out, and take more material off to get them all weighing the same.

90BlueGSX
07-15-2007, 11:47 AM
no my old man was driving my car when the valve broke off, he thinks nothing is wrong with the engine, Even their was this very loud knocking sound coming from the engine. So he just keep on driving like nothing happen. when the engine finally give up, he thinks it just over heated. :mad: :wall: Oh he didn't once but twice :wall:

That piston came out from the 1st destroy engine.

axemurderer
07-15-2007, 02:24 PM
If you intend on pushing the car, I would recommend pulling the slugs and inspecting the ring lands too. Definitely debur the indents. Hot spots = recipe for pre-ignition.

naw its a n/t get him to work car. If it was my car I would take the opportunity to get some 2g pistons but he doesent need anything fancy so he should be ok.

Driver
07-15-2007, 03:06 PM
How deep are we talking about here? If its less than a millimeter they will be fine.