Anyone think this is all related?
Thread Starter
TECH Senior Member
iTrader: (7)
Joined: Jan 2002
Posts: 12,754
Likes: 0
From: Katy, TX
Kyle: yup, Tiff's.. Car was sounding like a clunker (really bad exhaust leak) that really sounded like a manifold gasket leak. Well, a gasket change didn't fix it, so we pulled it off today and found the cracks. I touched up the welds (nice having a tig) and its fine for now.
I'm wondering if this manifold wasn't originally warped -- or if it was warped when it was sent back to repair the first crack (cyl 7 primary, where it meets the log). Either way, the stress of clamping down that 1/8" or so gap definitely seems why it cracked on cyls 1 and 7.. I'm seriously considering rebuilding this manifold out of schedule 40 tubing and elbows
I'm wondering if this manifold wasn't originally warped -- or if it was warped when it was sent back to repair the first crack (cyl 7 primary, where it meets the log). Either way, the stress of clamping down that 1/8" or so gap definitely seems why it cracked on cyls 1 and 7.. I'm seriously considering rebuilding this manifold out of schedule 40 tubing and elbows
you can get schedule 10 stainless elbows at mcmaster.com for real cheap they are on page 11 of their online catalog. thats what i made mine out of. 1 1/2 pipe is close to 1 7/8 tube. and sch 10 is strong enough not to crack and not heavy like sch 40.
Trending Topics
pssst truck manifolds, just ditch those things already....and the sch 40 tubing is also cheap and is strong too. Import dudes love turbo manifolds made out of that stuff.
J
J
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
TECH Senior Member
iTrader: (7)
Joined: Jan 2002
Posts: 12,754
Likes: 0
From: Katy, TX
Truck manis are nice, but tough to keep A/C 
Remember, this is her daily driver in the Texas heat.. We'll see how long this lasts, but I can forsee rebuilding in sched. 10 or 40 being a reality in the somewhat near future.
.. and yes, this is the QMP/SW kit.
Remember, this is her daily driver in the Texas heat.. We'll see how long this lasts, but I can forsee rebuilding in sched. 10 or 40 being a reality in the somewhat near future... and yes, this is the QMP/SW kit.
Although I could live without the AC, I don't think my son could. Besides, it could be pretty miserable in the summer (especially with the Houston humidity). I think I will keep the A/C and eventually get rid of this kit unless something else can be done. I am starting to get really tired of pulling the car apart every couple of months though.
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
Any exhaust manifold runs much hotter than the head it's bolted to and, therefore, thermally expands much more. The log thermally expands axially as much as .100" more than the cylinder head. Log headers inherently don't have very much flexibility built into them.
If you weld them, they will crack again.
There are 2 things you can try:
1. Cut the flange between each cylinder. This will allow the flanges to slide independent of each other and the cylinder head. You'll need a metallic header gasket (not aluminum) like copper or stainless because the flange will be sliding back and forth across it.
2. Cut up the log and install bellows type expansion joints between each cylinder. The Turbo Regals have this feature in the stock log header.
Mike
If you weld them, they will crack again.
There are 2 things you can try:
1. Cut the flange between each cylinder. This will allow the flanges to slide independent of each other and the cylinder head. You'll need a metallic header gasket (not aluminum) like copper or stainless because the flange will be sliding back and forth across it.
2. Cut up the log and install bellows type expansion joints between each cylinder. The Turbo Regals have this feature in the stock log header.
Mike
Next time you see a used Incon kit come up for sale jump on it. 
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
http://www.gnttype.org/techarea/pict...stockhdrs.html
Here's a pic of the Turbo Buick log with expansion joints.
Like I said, though, I'd cut the flanges first.
Mike
Here's a pic of the Turbo Buick log with expansion joints.
Like I said, though, I'd cut the flanges first.
Mike
Try creating a bracket to support the turbo too if that hasnt been done already. I am making a kit right now where there is a drives and pas. log, but the they run independently from eachother (not q.m.p. or tti style). The turbo will be supported by a bracket that bolts to the head...