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Old 09-23-2010, 05:33 PM   #1
ASU
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Default Found problem Cracked head

Thought it was a head gasket with all the smoking, no it was worse than that


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Old 09-23-2010, 05:53 PM   #2
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Happened to me too on the intake side though.
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Old 09-23-2010, 05:54 PM   #3
FuJi K
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those must be ported heads? or stock?
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Old 09-23-2010, 07:45 PM   #4
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CNC Ported Cosworth heads
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Old 09-23-2010, 07:58 PM   #5
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Doe! Man that sucks. Any clue what to attribute it to?
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Old 09-23-2010, 08:09 PM   #6
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Overporting most likley, not 100% sure the block is fine.
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Old 09-23-2010, 08:29 PM   #7
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same thing happened to me a while back...

Been hearing a few horror stories about Cosworths Big post heads lately...
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Old 09-23-2010, 08:35 PM   #8
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Humm just had a failure myself blew a hole out of the exhaust side...
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Old 09-23-2010, 08:51 PM   #9
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All I can think is that the port was way to aggressive there is no reason to have failure on heads like this with less than 4k on them and not hitting past 19 PSI. This time I am going to not port my heads just grind them down and cut the seats for my kelford and supertech valve train. This is for reliabilty issues the wall must be paper thin for that to happen.
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Old 09-23-2010, 08:56 PM   #10
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WOW man, that sucks. Sorry to hear and I know how you feel just when your close to having it all running good something jumps up and bites you.
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Old 09-23-2010, 08:58 PM   #11
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Had her purring like a kitten, now I am scrambling just to get her back up and running
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Old 09-23-2010, 09:12 PM   #12
Sinister redlines
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Ya, I am sure you heard about my latest experience with my 2.7L if not ask Mike or Dom. I feel ya and hope it gets better for ya. Too bad to I wanted to see your car running I had heard it was working awsome till this..
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Old 09-23-2010, 09:29 PM   #13
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It was still a monster even with the cracked head. Oh well back to step 1 again
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Old 09-23-2010, 09:34 PM   #14
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..............

Last edited by Evil Imports; 09-23-2010 at 09:43 PM.
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Old 09-23-2010, 11:56 PM   #15
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ekkkKK. So far, I only port at the valve bowl, valve guide, short turn and splitter for the exhaust side. For B25 STi heads and their smaller exhaust ports, they flow well because they are much straighter. Big improvement on stock valves with the B25 heads flowing 178cfm stock to an impressive 228cfm on the Dog Leg.
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Old 09-24-2010, 05:59 AM   #16
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Quote:
Originally Posted by FuJi K View Post
Big improvement on stock valves with the B25 heads flowing 178cfm stock to an impressive 228cfm on the Dog Leg.
Is that per port or for both (intake?) ports together ?

Tnx and sorry for the OT.
Walter
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Old 09-24-2010, 03:03 PM   #17
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Is the head repairable?
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Old 09-24-2010, 03:43 PM   #18
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Old 09-24-2010, 03:46 PM   #19
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Quote:
Originally Posted by ASU View Post
Thought it was a head gasket with all the smoking, no it was worse than that


YouTube - Cracked STI Heads
Newb question... what am I looking at?
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Old 09-24-2010, 04:26 PM   #20
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Quote:
Originally Posted by alcoolaid View Post
Is the head repairable?

Dindt know you could repair a cracked head
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Old 09-24-2010, 04:34 PM   #21
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Quote:
Originally Posted by rdieder View Post

I wish that would work, but I have a feeling it couldnt sustain 2000 temps and on top of that once a crack develops even if you seal it, its a weak point and prone to more cracks.
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Old 09-24-2010, 05:59 PM   #22
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Quote:
Originally Posted by ASU View Post
Dindt know you could repair a cracked head
I think it was bretune who had something similar happen to him. I believe he just welded the crack shut and then did some porting and was on his way. Id give that a shot with those big $ heads
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Old 09-24-2010, 07:01 PM   #23
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Quote:
Originally Posted by ASU View Post
I wish that would work, but I have a feeling it couldnt sustain 2000 temps and on top of that once a crack develops even if you seal it, its a weak point and prone to more cracks.
2000 temps? i'd stay away from that tuner, that high heat is a result of way lean.
I saw from your other thread you had over heating issues, did you top off with cool water? If so , it can crack a head if the motor was still hot. Also can crack from high pressures due to det
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Old 09-24-2010, 09:22 PM   #24
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High egts lead to cracks like that. JB weld will work fine on the intake side but not the exhaust. Just have it welded up and save the head. If you can get at the ends of the crack, drill them to stop it from spreading.
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Old 09-24-2010, 10:37 PM   #25
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Quote:
Originally Posted by Paul View Post
I think it was bretune who had something similar happen to him. I believe he just welded the crack shut and then did some porting and was on his way. Id give that a shot with those big $ heads
Yes sir u r perfectly right, first it happened on the exhaust side and sucked oil out of the motor so there was alot of smoke nothing major, then next it was on the intake side and then it sucked water...............HYDROLOCKED!
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