bishiboy

iTrader: (10)

Here's the pics of my head. I'm not sure if it's salvagable.
The spark plug threads are almost striped from removing the melted spark plug. Is it possible to Heli-coil, or will the heli-coil fail undet high boost pressures?
The valve seats seem ok, will need re-cutting.
The combustion chamber took a beating from the valve head bouncing around. I seems like this could be smoothed out with some bowl smoothing and polishing. My concern with that is the amount of material that will be removed.
The valve guide is alos melted and I will need new guides pressed in.
(for those that haven't seen this, here's one of the posts on how this happend:
https://www.evolutionm.net/forums/sh...d.php?t=108039 )


I'm hoping one of the head specialist could chime in on this. here's more pics.
http://www.we-todd-did-racing.com/we...MXk1NDE%3D.jpg
http://www.we-todd-did-racing.com/we...MXk1NDE%3D.jpg
http://www.we-todd-did-racing.com/we...MXk1NDE%3D.jpg
http://www.we-todd-did-racing.com/we...MXk1NDE%3D.jpg

http://www.we-todd-did-racing.com/we...MXk1NDE%3D.jpg

CweSt eVo

eeeeeeeeekkkkkkkkkkkkkkkk

steveevo8

hwo did you do this?? so i know not to let it happen to me?? ( not trying to flame or anything ) i'm just curiosu so i know what to be careful with

w_tomas

iTrader: (17)

Sorry to hear about your car man. I'm Barry's friend over here in Pcola. I work on a weapon system in the navy which incorporates a gattling gun that fires 4500 rounds a minute, and we often have to repair the ammo handling system with heli-coils and they work fine. They are not under the same pressure or heat that your head would endure. Good luck to you, and keep us posted.

bluebanana23

iTrader: (26)

the horror!

Az3ar

iTrader: (18)

pretty

1QWKEVO

iTrader: (3)

ya that looks about right... sucks man sorry tou hade to go through that... if it makes u feel any better i've seen worse.

any damage to the piston? My buddies SR20 damaged the piston and scored the walls up becasue he wouldn't listen and kept pushing the car hoping it would go away or something... Took about 30 mins, problem was hot plugs + high boost = bad tuning on 91

methuselah

iTrader: (6)

Looks repairable but the costs might not make it worth it. You're looking at welding on the combustion chamber if you want to keep the stock compression ratio. Im not sure if just a resurfacing would work otherwise. And then the cost of polishing the chamber, you might as well have them all done.

I would look into seeing if this is an acceptable core for those shops that are doing ported and polished heads. And, of course, wait for more educated opinions.

HTH.

MalibuJack

iTrader: (5)

EEK! You might be able to use this as a core for an upgrade, but the cost of repairing it may be more than replacing the casting.

BlackEVO

Man, that is ugly. I would just bring it to a reputable engine/head/machine shop and have them give it their expert once-over. I would say it seems repairable. Whether or not labor cost makes that a feasible option, I don't know. Cleaning up the CC mess looks like it may be just enough to unshroud the valves, so bonus there That one big gouge next to the plug hole may need to be welded up and then ground because it looks deeper than any other. The same could be done in the port/radii if simply porting it smooth is going to take off too much material.

I've never had to Helicoil a plug hole, but have done other bolts in aluminum heads and the Helicoil is ridiculously strong...I just don't know if they will stand cyl temps or not. Again, that may be something that needs to be welded up, drilled and re-tapped. Machine shops have likely seen it all and can probably recommend what to do with it. Get a quote on the repair, get a quote on a new head from *cough*, check for wrecked Evos being parted out, check if it's an acceptable core for an upgrade and then decide which you want/have to go...

chinalfr

iTrader: (2)

Wow, as pretty as mine.

It's salvagable. Get to a machine shop, they should be able to fix it. The machine shop probably can weld some aluminium and resurface it.

Maybe Dave at Buschur can take it as core and help you upgrade to a stage 3 cylinder head.

How is the block?

Nad1370

iTrader: (1)

[QUOTE=bishiboy]Here's the pics of my head. I'm not sure if it's salvagable.
The spark plug threads are almost striped from removing the melted spark plug. Is it possible to Heli-coil, or will the heli-coil fail undet high boost pressures?
The valve seats seem ok, will need re-cutting.
QUOTE]


You can use a stronger version of a Hele-coil where you tap a bigger size thread and screw in a whole new threaded sleeve. Way stronger than a Heli-coil

I just forgot what it's called. But most specialty shops or parts store knows this tool.

good luck on re-building.

dryad001

iTrader: (27)

Weld in a combustion chamber??? That head is toast. It's not worth the money to even have an estimate done on that thing.

bishiboy

iTrader: (10)

What about this?
https://www.evolutionm.net/forums/sh...ight=darkhorse

johny719

iTrader: (10)

whoa... how did this happen? like what did you do?