blown headgasket

[AUTOMECH01]

have a 91 tsi and i rebuilt engine. 500 miles later it blew the head gasket . water came out the front by the belt. i used a Mitsubishi Composite Head Gasket. and stock head bolts. boost was set a 15 to 18 psi . using a Hallman Pro Series controller . mods are as follws. big 16, evo exhaust manifold, evo o2 adapter, complete Dejon Tool inntercooler Pipes, K&N air filter and hacked maf, 2nd gen pistons, comp angle valve job, no balance shafts compresion was 145lbs on all 4 cyls which i think is kinda low but it was equal.

 

[AUTOMECH01]

here is a pic.

 

[fasteclipse1992]

did u ever retourque the bolts? dive it around easy for 25 miles or so and retourque the bolts. from the looks of the pic it looks like the pressure on the gasket was uneven, smooth spots in center then the rough edge on the end.

 

[AUTOMECH01]

here is a pic.

 

[fasteclipse1992]

well the block looks fine but the chances of that surface warping is slim, how is the head?

 

[AUTOMECH01]

i didn't retorqe the bolts but drove for 200 miles with no bost

 

[TalonR]

It almost looks like the gasket was a bad egg to begin with.....just retouque the bolts after about 25 to 50 miles like what was said....I've had a couple go in different cars from lose bolts

 

[AUTOMECH01]

Originally posted by fasteclipse1992
well the block looks fine but the chances of that surface warping is slim, how is the head?

head was resurfed when it was rebuilt

 

[fasteclipse1992]

yea that gasket looks bad all over may have been defective, did the car ever over heat? 1st 500 miles on a rebuilt engine is the most crucial. its best to drive without the thermostat in during breakin too to avoid any overheating

id check the head to make sure its not warped too tho

 

[AUTOMECH01]

Originally posted by TalonR
It almost looks like the gasket was a bad egg to begin with.....just retouque the bolts after about 25 to 50 miles like what was said....I've had a couple go in different cars from lose bolts

i'am going to go with arp head studs which gasket should i use if i plan on boosting to 25 psi

 

[AUTOMECH01]

Originally posted by fasteclipse1992
yea that gasket looks bad all over may have been defective, did the car ever over heat? 1st 500 miles on a rebuilt engine is the most crucial. its best to drive without the thermostat in during breakin too to avoid any overheating

id check the head to make sure its not warped too tho

never overheated 180 therm. and vac. sysm. for air when installed

 

[fasteclipse1992]

ive been told to use mitsu steel head gasket but when i went to the parts dept they told me there isnt one. i was going to try one of those copper head gaskets
copper gasket
but here is a mitsu steel head gasket tho
mitsu steel head gasket
that looks like the 1 to use and must be the 1 ppl were telling me about.

 

[AUTOMECH01]

http://www.partznet.com/ they have the mitsu steel for 69.00. what do you guys think about the cranking psi of 145lbs ?

 

[mazdamx6pwr.com]

Isn't that low for 8.5:1 pistons? I get 145-150 on the stock 7.8:1 pistons in my six bolt.

 

[AUTOMECH01]

do you think its from the gasket? since it had 200 miles its had the same readings and thier all the same so its not the rings or the head . maybe the gasket is to thick and it lowered the cc's . right now the gasket thicknes is .054 thats thick for crushed ?