blowing head gaskets and plugs

[ericohotto]

We have a 96 and put a new turbo on that we had bought and was supposed to be a direct bolt on replacement. No sooner than we got it all back togther and it blew out the head gasket and burned a small hole in the head and destroyed the plug. We had the head repaired, pressure tested and milled to make sure it was flat. After puuting it back together, it started and idled fine, but as soon as my mechaninc test drove it and got on it a little bit, it again blew the head gasket and blew out 2 plugs. This is getting expensive and we need some experienced advice. Is it too much boost? will a manual boost controller work? Thanks! Eric

 

[donniekak]

How much boost are you running? Do the pistons show signs of detonation? Did you use new headbolts?

 

[ericohotto]

It is a TD05 turbo and came out of the box and put on, the ad stated direct bolt on replacement for the 14B turbo, capable of 380hp and delivers 520cfm and14.7 PSI. I am very new to this segment of automotive technology as you can tell. We have not yet taken the head off again but will this week, but I do know it blew the plugs apart and is getting coolant into the 2 and 3 cylinders. Thanks! And yes, new head bolts, new header, new everything.

 

[bluegs03]

If you are having THAT much difficultly with blow headgaskets I would do the following, take the engine out of the car get the block and head resurfaced machined whatever. Get a set of arp headstuds (EXTREME PSI : Your #1 Source for In Stock Performance Parts - ARP Head Studs: Mitsubishi Eclipse 92-99 7 Bolt) Thats just the website i use no need to use it if you dont want too. Make sure you are using an oem Mitsubishi composite headgasket or better (MLS etc). While all of this is being done make sure the problem isnt elsewhere, get some logging software and have it tuned etc. You could be detonating so bad its ruining headgaskets etc. Basically do it right or put the stock turbo back on and do the first few steps. You gotta pay to go fast, so how fast do you wanna spend? =)

 

[BogusSVO]

HOW was the head surfaced?

if it was "belt surfaced" that could be your issue.
http://www.dsmtuners.com/forums/cyl...0613-why-not-let-your-head-belt-surfaced.html

the surface finish should look about like this....
http://www.dsmtuners.com/forums/new...face-4g63t-cylinder-head-mls-head-gasket.html

also what is the thickness of your head? 5.200 is the new/stock thickness with a min thickness speck of 5.185 if you are thinner, get a thicker head gasket

 

[ericohotto]

I am guessing this is detonation, but why? We haven't changed anything on the timing or anything else. when you say some logging inof, what are you referring to? Where we live, there are very few knowledgeable turbo guys.

 

[BogusSVO]

increased compression from the head being milled thin, cheap gas (87 octane) too much ignition time, wrong range of spark plugs, knock sensor broken or not pluged in

all of these by themselves or combinded can cause pre det.

 

[ericohotto]

where is the knock sensor located? We can check the timing and plug range and will buy a thicker head gasket.