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what could cause this? Pic inside


Yao
Senior Member


Galant VR-4 org Post #: 1017235 posted 09/10/11 09:48 AM     Remind Me!  Send Private Message   Edit Post      


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Okayplayer
Member +
1968/2000


Galant VR-4 org Post #: 1017248 posted 09/10/11 10:50 AM     Remind Me!  Send Private Message   Edit Post      
Looks like you had a pretty good exhaust leak. Maybe a bolt wasn't tightened enough. Or maybe the mating surface on the manifold, or exhaust housing wasn't flat. Or the gasket just failed.



My car eats turbos
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1986 Chevy C10

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rdomeck
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Galant VR-4 org Post #: 1017291 posted 09/10/11 02:42 PM     Remind Me!  Send Private Message   Edit Post      
Maybe that one bolt was tightened down first and then the gasket was moved to put the other bolts in? Doesn't look like a blow out, looks like it was torn.



EVO III 16G, manifold and O2 housing, 3" exhaust, Evo 9 IC, 3" GM MAF, GM IAT, GM MAP, LC1 wideband, V3 Full, RC 750's, Aeromotive 340 fuel pump, Adj. FPR. Stock internals. Baer front brakes, Evo 9 Ohlin's.

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TRBODSM
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Galant VR-4 org Post #: 1017294 posted 09/10/11 03:34 PM     Remind Me!  Send Private Message   Edit Post      
I would also say exhaust leak but it looks like one of those thick metal gaskets. I would use a OEM gasket and OEM bolts and washers(2 washers per bolt) and don't forget the anti-seize. Off the top of my head I believe the bolts are torqued to 48-49 ft/lbs. Never had a problem with that set up.

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Yao
Senior Member


Galant VR-4 org Post #: 1017456 posted 09/11/11 09:27 AM     Remind Me!  Send Private Message   Edit Post      
I know, it looks like torn, but it is infact a blowout!!? If a thick metal gasket like that couldn't stand a chance, what makes stock gasket work? I have the stock over size one on there now, but incase I need another if it happens again, what is the part number for the stock bigger hole gasket?



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ds-map, ntk.

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turbowop
Hard Snarker
1051/2000



Galant VR-4 org Post #: 1017461 posted 09/11/11 10:29 AM     Remind Me!  Send Private Message   Edit Post      
Any gasket will blow out like that if the bolts come loose.



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Diego
Mad Hatter Suite Touche Debackle Guage filled by Justin
1309/2000


Galant VR-4 org Post #: 1017793 posted 09/12/11 03:38 PM     Remind Me!  Send Private Message   Edit Post      
ANY gasket will explode with a loose bolt. Here is my old gasket, thankfully I have spares, one of the turbo to mani bolts backed out causing this on mine.



"I love blackjack. But I'm not addicted to gambling. I'm addicted to sitting in a semi circle."

91 nile black vr4, 1309/2000

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Brunoboy
Jesus Clips
352/1000
556/1000


Galant VR-4 org Post #: 1017798 posted 09/12/11 03:48 PM     Remind Me!  Send Private Message   Edit Post      
Quoting Yao:







this happened to me many times, changed your manifold to turbo bolts and use the washers.



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broxma
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Galant VR-4 org Post #: 1017920 posted 09/13/11 04:20 AM     Remind Me!  Send Private Message   Edit Post      
There is another really good solution for this. Have the surfaces machined or sanded flat, and don't use a gasket at all. I don't use any gasket on my turbo to manifold flange. If it's smooth enough, you don't need one.

/brox



I am big into recycling though and if your not into sacrifice or burnt offerings, you may want to stick with 93 octane.

/brox

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Andy_S
Overcomplicated


Galant VR-4 org Post #: 1017931 posted 09/13/11 08:11 AM     Remind Me!  Send Private Message   Edit Post      
I usually face both surfaces and use a piece of .030 stainless sheet as a gasket. No problems yet.



I found v8's...

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mr.mitsu
Member +++


Galant VR-4 org Post #: 1017932 posted 09/13/11 08:47 AM     Remind Me!  Send Private Message   Edit Post   
I always use an oiling stone on any machined mating surfaces.

Must be the millwright in me lol

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