Help! Cracked exhaust manifold.

[normandy2013]

That is the exact same as the '626' manifold, save yourself $350 and just get one from a junkyard from a 01-02 626 that doesn't have the VICS/VTCS solenoids.

Are you looking for a turbo manifold or an intake manifold?

Thanks bro, I'm such a noob at this !

Its gonna be the turbo manifold !

 

[PSUENGR]

Thanks bro, I'm such a noob at this !

Its gonna be the turbo manifold !

the 626 manifold is an intake manifold. there are no turbo manifolds that you can pull off another mazda car. you need to either find a stock one from an MSP somewhere or go with one of the aftermarket options discussed a couple months ago in this thread.

 

[normandy2013]

the 626 manifold is an intake manifold. there are no turbo manifolds that you can pull off another mazda car. you need to either find a stock one from an MSP somewhere or go with one of the aftermarket options discussed a couple months ago in this thread.

Okay boss do you recommend getting the cracks on the exhaust manifold welded ?
And do you recommend wrapping the exhaust manifold in thermal tape ?

 

[PSUENGR]

Okay boss do you recommend getting the cracks on the exhaust manifold welded ?
And do you recommend wrapping the exhaust manifold in thermal tape ?

If you want the car to run, then yes you should weld the cracks. Or buy an aftermarket header.

I wouldn't wrap the manifold either. It cracked because it got hot and expanded more than the engine. Wrapping it will make it hotter and cause more expansion. Weld the cracks and cut the bolt holes so that the individual ports can expand without stressing the manifold.

 

[normandy2013]

If you want the car to run, then yes you should weld the cracks. Or buy an aftermarket header.

I wouldn't wrap the manifold either. It cracked because it got hot and expanded more than the engine. Wrapping it will make it hotter and cause more expansion. Weld the cracks and cut the bolt holes so that the individual ports can expand without stressing the manifold.

Actually wrapping it should help, the exhaust manifold metal is super hot and the heat is giving off into the air from the metal slowly, thermal tape will absorb that heat; essentially reducing the heat load off the metal on to the tape which then will release the heat into the air.

Just like in computers thermal compound is applied to the CPU that gets super hot...that thermal compound (paste) is then touching a heatsink that will dissipate heat from the CPU, like a sandwich...
Wish I can trade my computer tech skills for auto tech skills -.-

 

[Cleverfrog]

Actually wrapping it should help, the exhaust manifold metal is super hot and the heat is giving off into the air from the metal slowly, thermal tape will absorb that heat; essentially reducing the heat load off the metal on to the tape which then will release the heat into the air.

Just like in computers thermal compound is applied to the CPU that gets super hot...that thermal compound (paste) is then touching a heatsink that will dissipate heat from the CPU, like a sandwich...
Wish I can trade my computer tech skills for auto tech skills -.-

i wouldnt wrap the stock manifold but it sounds like you know everything about wrapping -_-

 

[normandy2013]

i wouldnt wrap the stock manifold but it sounds like you know everything about wrapping -_-

hehe, I'm the amateur here about auto tech so, I respect all, just inputting my thoughts/ideas...I guess ill go with you guys ill take a pic of the engine bay when I get the manifold welded !

 

[PSUENGR]

Actually wrapping it should help, the exhaust manifold metal is super hot and the heat is giving off into the air from the metal slowly, thermal tape will absorb that heat; essentially reducing the heat load off the metal on to the tape which then will release the heat into the air.

Just like in computers thermal compound is applied to the CPU that gets super hot...that thermal compound (paste) is then touching a heatsink that will dissipate heat from the CPU, like a sandwich...
Wish I can trade my computer tech skills for auto tech skills -.-

thermal tape is meant to transfer heat from one source to another. it will not "absorb" any heat. unless you are going to add a heatsink to the manifold, wrapping it in thermal tape will not have any beneficial effect. To relate back to your analogy, thermal compound on its own will do almost nothing to keep your CPU cool, despite its excellent conductive properties.

Cut a slice in the flange of the exhaust manifold where it bolts up to the engine. The slice separates the 4 runners and allows each to expand/contract on its own without stressing the others, which is what caused the crack in the first place.

 

[Spiced MSP]

who the hell would put any kind of tape on a blazing hot ass manifold?