Pontiac Solstice Forum - View Single Post - Exhaust Manifold Bolts.....

opjohn
I had the exact same issue about 18 months ago. When I looked at the stock manifold and then the turbo manifold I notice the holes in stock were significantly larger than on the turbo manifold. I also noticed the seperation cuts between each port were also touching each other.

It was shearing that caused this, as such I ended up modifying the turbo manifold by:
- Drilling out all but the two center most ones to match stock
- Recut (sawed) the seperation cuts between each port to provide more clearance (alllow for more CTE issues).

Never had the problem again.

Quote:

Originally Posted by opjohn

A couple of months ago I blew a gasket between my turbo and exhaust manifold....my bad because I didn't check the nuts which had backed off. Fixed that issue but then three weeks ago I noticed the car sounding more like a truck. Long story short, the exhaust manifold was somewhat loose and found that two bolts had broken off. I had torqued one off when we installed the turbo but these two that broke recently were at the other end of the manifold.

I had all the bolts replaced and during this found that the manifold itself is a little warped but with the new gasket and nuts/bolts, things seem to be fine for now. I will have to buy another exhaust manifold however

Are there stronger bolts/pins that can replace the oem ones ? Not sure if anyone else with an aftermarket turbo has had similar issues.

I suspect that there is a shearing effect going on during wot which may be causing this....just a guess.

I definitely am going to keep a close eye on them but I know I'm going to go thru this again and would like to do my homework before that day comes.

Any thoughts ?

__________________
North Fort Worth Solstice #2020
Mine on: 12/10/2005 from Alan Young Dealership
Color: Deep, Steel/Sand, Hahn Turbo, and other good stuff.

Last edited by VIN2020 : 07-11-2008 at 09:21 AM.

	VIN2020 Member Join Date: Jan 2006 Location: Fossil Creek Fort Worth TX	opjohn I had the exact same issue about 18 months ago. When I looked at the stock manifold and then the turbo manifold I notice the holes in stock were significantly larger than on the turbo manifold. I also noticed the seperation cuts between each port were also touching each other. It was shearing that caused this, as such I ended up modifying the turbo manifold by: - Drilling out all but the two center most ones to match stock - Recut (sawed) the seperation cuts between each port to provide more clearance (alllow for more CTE issues). Never had the problem again. Quote: Originally Posted by opjohn A couple of months ago I blew a gasket between my turbo and exhaust manifold....my bad because I didn't check the nuts which had backed off. Fixed that issue but then three weeks ago I noticed the car sounding more like a truck. Long story short, the exhaust manifold was somewhat loose and found that two bolts had broken off. I had torqued one off when we installed the turbo but these two that broke recently were at the other end of the manifold. I had all the bolts replaced and during this found that the manifold itself is a little warped but with the new gasket and nuts/bolts, things seem to be fine for now. I will have to buy another exhaust manifold however Are there stronger bolts/pins that can replace the oem ones ? Not sure if anyone else with an aftermarket turbo has had similar issues. I suspect that there is a shearing effect going on during wot which may be causing this....just a guess. I definitely am going to keep a close eye on them but I know I'm going to go thru this again and would like to do my homework before that day comes. Any thoughts ? __________________ North Fort Worth Solstice #2020 Mine on: 12/10/2005 from Alan Young Dealership Color: Deep, Steel/Sand, Hahn Turbo, and other good stuff. Last edited by VIN2020 : 07-11-2008 at 09:21 AM.