Boosted MINIME HELP! Blown Headgasket???
 

Ok guys, I recently did a MINIME swap B7/Z6 and I used the a new Z6 metal headgasket. Well the car ran great after the MINIME was finished. Then I boosted this same motor with a T25 runnin the stock wastegate pressure and tuned it with a VAFC. The car was a beast for the first few pulls, then while we were tuning it we noticed it was smoking very bad from the exhaust and from under the hood. Well evidently the boost pressure or something exploded the radiator overflow hose completely off and there was a plug on the back of my block under the intake manifold that exploded off also. So there was coolant EVERYWHERE! Well I got the car home and put a new clamp on the radiator overflow hose and I got rid of that plugged hose and ran the accual hose where it needed to go etc. I also did a coolant flush while I was at it just incase of a blockage. Then I got everything filled back up and went and ran the car again, well it was still smoking some and I figured it was just burning off the coolant that I missed cleaning up... After driving it for a little bit I noticed the temp gauge was still getting alot hotter than it should and I noticed that the motor was eating my coolant, it was leaking anywhere. So I filled it back up and went back for another drive and hit 8 psi and after that the car was very sluggish to get home. It sounded like the it was only running on 2 cylinders.
When I got home I inspected everything and noticed ---- running down the back of my block. It was oil and coolant mixed. GREAT!
Well today I took the head off and the block looks amazing, there isn't anything wrong with it. The head was completely covered in oil and coolant mix. I haven't drained the pan yet, but Im pretty positive that Im going to find the same ---- in the pan... :(

-My question is do you think that this is a headgasket problem? I am pretty sure it is, I just want to find out what everyone else thinks. My gasket looked used and abused when I inspected it.

- Also if it is my headgasket do you think that for this application I should get a Cometic High boost gasket or what? I really need to get this car running...

I have pics of everything if it helps.

Thanks a bunch for the help in advance!
~Will

Re: Boosted MINIME HELP! Blown Headgasket???
 

The Z6 MLS HG can handle plenty of abuse, you don't need a cometic.

Might just be a bad HG, might also be lifting your head.

Re: Boosted MINIME HELP! Blown Headgasket???
 

yeah , try some arp head studs , when you boost an engine with the stock head bolts sometimes there "stretched", replace your head gasket and get some new head studs, good luck. Keep us updated. ;)

Re: Boosted MINIME HELP! Blown Headgasket???
 

Sounds like the headgasket.
Straight edge the deck and head.

Re: Boosted MINIME HELP! Blown Headgasket???
 

So what should I replace? Do you think I can get away with just doin another stock Z6 headgasket? Or should I do the new headgasket AND the ARP head studs? Im really not tryin to spend alot of money on this car hinting the HMT, but I need it to run and continue to run...

Re: Boosted MINIME HELP! Blown Headgasket???
 

when you put the z6 mls gasket did you use used head studs? if so they may have been streched and although you torque it to spec they wont fit right

Re: Boosted MINIME HELP! Blown Headgasket???
 

yeah , I already mentioned that ::)

Re: Boosted MINIME HELP! Blown Headgasket???
 

Yes, and I'm going to be the 3rd person now to tell him to use a stock HG and buy some ARPs. My head was lifting, but didn't for a while and then started (7 months later or so maybe). Those head bolts aren't that great and I can assure you that ARPs and a new HG will solve a HG, which in your case, sounds like the issue.

Heard copper spray on OEM HGs are good, but I never got a chance to do mine. Just a small hint I've heard.


JP

Re: Boosted MINIME HELP! Blown Headgasket???
 

well I ordered another stock Z6 headgasket and some ARP's for it. *** HOPEFULLY *** this fixes my problem. I will keep you all updated. Thanks! ;D

Re: Boosted MINIME HELP! Blown Headgasket???
 

My motor setup will be a BIT different, my block is A6, and the head is y8... Which ARP studs do I need? The ones for the stock block/head? or the ones for the y8 block/head??

Thanks!