"overboosting or rev-limiter?"

[turbo-tease]

well, I've finally started to tear down her down I will keep you posted on what I find when it is completely appart!

[janus]

what would you guys say about the headgasket? if 1&2 both are low, it might be "just" the head gasket? i had a similar situation like you, but my compression was like 0-0-110-110 .. just that mine had not had excessive boost before

there is even a saying like "raise your boost till headgasket blows, replace, and go back a bit" so fortunately you just shot your HG, but i wouldn't drive that thing overboosted for a longer time, if that's your DD and you need reliability!

turbo-tease, i'm in fact just about to put back the head on my 2.5l T1 - i'm sure you can do it too! good luck, and keep us posted!

[lennylebaron]

OK I will give my .02 worth. Make sure the head is not warped or craked, clean everything religiously, use ONLY mp replacement head gasket and new head bolts making sure to use proper torque sequence and paying special attention not to under or over torque the bolts close to cylinder #1. I replaced 3 head gaskets in the space of one year on my caravan untill I learned that the ONLY gasket to use was Mopar Perf. Its been almost four years now with no problems. I will be honest and say that it has hit overboost on countless ocassions(oops not on purpose!) and sure it has seen some detonation here and there (ooops also not on purpose!). Once you get a good head gasket on there and get the head nailed down right you should be golden at least untill you start raising your boost level up above 14 psi. Just make sure that you are not running way lean or will eat that new gasket up pretty fast!!! Good Luck!

[turbo-tease]

hey! thanks for all the input guy's, I sure do miss driving my car! I feel like I am missing something when I am looking for my problem I had this same set up on the car when it was in arizona for 7 years & never had these problems before I just couldn't keep a transmission to stay together then, now I have been in indiana for 6 years & I have been having nothing but trouble with it! but the transmission has worked just fine!

[turbo-tease]

well,the head is finally off! I found no damage to pistons & found no damage cylinder walls! But the head gasket did blow & blew pretty big in between the #1 & #2 cylinders.That was the only damage I found on the head gasket. Also found no other damage period to the rest of the motor.

[janus]

hehe, just what i was suggesting

oh well, this brings back some image into my mind.. it's been a while and i'm still not done with that head gasket change, lol, but i've been abroad in the meantime..



and btw, if you get new turbo lines, dont forget the thread sealant!! right now, i have to crawl behind the manifolds and take off the lines again because the head is already wrenched tight to the engine again, but i noticed the coolant turbo lines were all leaking when i poured in some water because i didn't seal 'em awful thing to do, really

[turbo-tease]

Well it's ready to go back together again! Was wondering about putting copper spray on the headgasket,is there any benifits to doing this or does it even matter? Would anyone do this? I was also thinking about changing the valave seals while the head is off,can I do this without removing the manifolds to do so? thanks, mike.

[turbo-tease]

Quote:

Originally Posted by turbo-tease Well it's ready to go back together again! Was wondering about putting copper spray on the headgasket,is there any benifits to doing this or does it even matter? Would anyone do this? I was also thinking about changing the valave seals while the head is off,can I do this without removing the manifolds to do so? thanks, mike.

Any input on this? At all? I am ready to go back together with it just waiting to see what people have to say on this! thanks again! mike.

[turbo-tease]

?

[speeduphoria]

If you dont fix your boost problem and run 87 octane w/ no IC and run boost to cutout you'll be right back where you started in no time

[turbo-tease]

Quote:

Originally Posted by speeduphoria If you dont fix your boost problem and run 87 octane w/ no IC and run boost to cutout you'll be right back where you started in no time

thanks for your input speeduphoria! I will getting those things to fix that problem of the mess! the other thing I need to know is copper spray help to seal the headgasket?

[puppet]

I'm gonna say no on the copper spray. I assume you're using a MP head gasket ... they have a sealer applied to them already.
*(don't store them out of the package they arrived in ... don't use one that came to you out of the package).
The copper spray may interfere with any sealing at all. The two sealers would both have to bond together and I don't think they will.

Copper spray is used on gaskets that are supplied dry. Question is does it seal better that the sealer used from the factory. Meaning you'd have to clean the gasket completely free from any foreign material first. You're on your own here though cause I don't know what the factory used as a sealer (base stock) or how they applied it. It must grip both composite sides of the gasket so getting it completely off might be a bitch.

Like speeduphoria said, it isn't the gasket seal it's your tune that blew that one.
Head flat ... bolts torqued correctly ... running good fuel correct timing ... sensible boost level for your set-up ... chances of blown gasket goes way down.
Took a lot to blow that gasket like that. Got to fix that problem.


BTW .. how long was that gasket on the engine? Got any snap shots of the junctions between the cylinders? Are they a little shinny?

Study that to see if the detonation problem is global or just one of these two cylinders.

[mad_psi-shelby]

lol my car has 138000 on it and ive been overboosting it for 3 days like 15psi and it doesnt run lean doesnt ping doesnt smoke nothin. Im gona stop tho its only gona make things worse lol

[IROCNOROLL]

Quote:

Originally Posted by turbo-tease thanks for your input speeduphoria! I will getting those things to fix that problem of the mess! the other thing I need to know is copper spray help to seal the headgasket?

Mike... No to the copper spray. BTW... did you check the height of the aligning dowels at each end of the block and the depth of the dowel holes in your head, especially at the #1 cyl. end? And check the line off the side of the turbo outlet to the "t" fitting and make sure it is not plugged. Easiest to do on the bench before the head goes back on. Good luck...Bob.

[turbo-tease]

when we pulled the head off the alignment dowel next to the #1 cylinder came out of the block & stayed with the head. Is it the lines that get plugged up or the t-fitting or a vac. valve?