cracking turbo manifold
Moderators: Growler, jif, SLYDIT, Born_disturbed
cracking turbo manifold
hey there guys
first il put it out there that I'm new to the forum and i have recently brought coles old car also known as user sprsta
i have owned the car for nearly 2 months now and the manifold has cracked 3 times now the first time it cracked the engineer didn't penetrate the weld enough so this time round i got it done properly with a slight re route done on the down pipe to take some stress off it.it lasted 5days before i noticed it had cracked again (today)
now I'm sure it hasn't cracked before up until now that its in my hands i have been talking to sprsta and he said by the sounds of it the tune has been played around with so that may play a part in the mani getting to hot from running lean,I'm just having problems trying to connect my laptop to the link to see whats going on via data log.
long story short the manifold is made out of schedule 40 mild steel and is pretty much rubbish now.i just need some advice on what road to go down regards who does good custom manifolds or i have come across a flying miata cast manifold i can't post a link as I'm to new, it is found on flyin miatas webpage but going down that track i would have to change my down pipe.i just want to drive it and not be worried every time i lift the bonnet up :/ lol
your opinion would be greatly appreciated
il post up some photos of the manifold asap
marcus
first il put it out there that I'm new to the forum and i have recently brought coles old car also known as user sprsta
i have owned the car for nearly 2 months now and the manifold has cracked 3 times now the first time it cracked the engineer didn't penetrate the weld enough so this time round i got it done properly with a slight re route done on the down pipe to take some stress off it.it lasted 5days before i noticed it had cracked again (today)
now I'm sure it hasn't cracked before up until now that its in my hands i have been talking to sprsta and he said by the sounds of it the tune has been played around with so that may play a part in the mani getting to hot from running lean,I'm just having problems trying to connect my laptop to the link to see whats going on via data log.
long story short the manifold is made out of schedule 40 mild steel and is pretty much rubbish now.i just need some advice on what road to go down regards who does good custom manifolds or i have come across a flying miata cast manifold i can't post a link as I'm to new, it is found on flyin miatas webpage but going down that track i would have to change my down pipe.i just want to drive it and not be worried every time i lift the bonnet up :/ lol
your opinion would be greatly appreciated
il post up some photos of the manifold asap
marcus
-
- I am quitting my job and going 5-ing
- Posts: 747
- Joined: Sun Jun 24, 2012 11:58 am
-
- Need, more, 5-ing, time....
- Posts: 153
- Joined: Thu Feb 28, 2008 8:35 pm
- Location: north shore
cracking turbo manifold
my first question is what have you done to the car in the time you have owned it ?
-
- See my 5 and raise you.
- Posts: 95
- Joined: Tue Jun 04, 2013 6:14 pm
- Location: Hawkes Bay
If its mild steel you have done something wrong to crack it..
Do you have a flexi as close to the turbo as possible and if the wastegate is seperate and then joins the exhaust it will need a flexi too. Do you have a brace off your block to support the weight of the turbo? Also check the flanges for flatness as cranking them up to seal a gap puts a lot of unnecessary stress on the welds.
When the cracks were welded up did he drill the ends out? Or just poo over it?
Don't get a log manifold, they are horrible. Just spend money on a nice shaped, good quality mild steel one.
Mine has been glowing red hot after back to back dyno runs and 8 lap races and has cracked only once when a bolt vibrated loose.
Do you have a flexi as close to the turbo as possible and if the wastegate is seperate and then joins the exhaust it will need a flexi too. Do you have a brace off your block to support the weight of the turbo? Also check the flanges for flatness as cranking them up to seal a gap puts a lot of unnecessary stress on the welds.
When the cracks were welded up did he drill the ends out? Or just poo over it?
Don't get a log manifold, they are horrible. Just spend money on a nice shaped, good quality mild steel one.
Mine has been glowing red hot after back to back dyno runs and 8 lap races and has cracked only once when a bolt vibrated loose.
-
- I am quitting my job and going 5-ing
- Posts: 747
- Joined: Sun Jun 24, 2012 11:58 am
-
- Need, more, 5-ing, time....
- Posts: 153
- Joined: Thu Feb 28, 2008 8:35 pm
- Location: north shore
first of all putting a rubber mount at the gearbox is defeating the purpose of the brace as it will move around .
secondly looking at your face book posts you have lowered the a lot more than when Cole owned it if it is hitting on the bump stops all the time the jaring will make the manifold crack as it is along manifold.
thirdly if you dont want to redo the down pipe and intercooler piping then you would have to find someone near you to copy the one you have.
secondly looking at your face book posts you have lowered the a lot more than when Cole owned it if it is hitting on the bump stops all the time the jaring will make the manifold crack as it is along manifold.
thirdly if you dont want to redo the down pipe and intercooler piping then you would have to find someone near you to copy the one you have.
-
- Keep calm, Forum Moderator here.
- Posts: 1610
- Joined: Sun May 21, 2006 6:18 pm
- Location: In the Garage.
My schedule 40 manifold has been in for seven years and I haven't touched a thing on it. Where is it cracking? There's nothing wrong with a log manifold for a street car. There's on point spending big bucks on a custom equal length manifold when you can spend it better else where like coil on plugs or ev14 injectors
RED '90 TURBO.
SCARING PRIUS DRIVERS SINCE 2002
SCARING PRIUS DRIVERS SINCE 2002
-
- Keep calm, Forum Moderator here.
- Posts: 1610
- Joined: Sun May 21, 2006 6:18 pm
- Location: In the Garage.
thats a classic example of overheating the work. you need to do a root run, then let it cool , then do filler runs. if you try to weld it/fill it all in one go you are going to stress the surrounding area.that bit is now toast. youll have to replace it.
RED '90 TURBO.
SCARING PRIUS DRIVERS SINCE 2002
SCARING PRIUS DRIVERS SINCE 2002
-
- I have stars, you haven't. Deal with it
- Posts: 1293
- Joined: Wed Dec 24, 2008 11:35 am
- Location: 36.8167° S, 174.4167° E
I have a top mounted bracket...no issues with cracks...its the best way to support/brace the turbo.Completes the triangle just like anything that needs a brace you must have three sides to the equation...no good just having lower braces when all the weight is at the top.
Re-weld it,put a top brace on it and see how it goes!...cheapest option for now by far!
Re-weld it,put a top brace on it and see how it goes!...cheapest option for now by far!
1989 NA 1650
1998 NB 1800
2005 NC 2000
1990 Landcruiser
Surfboard
Push-bike
Hiking shoes
1998 NB 1800
2005 NC 2000
1990 Landcruiser
Surfboard
Push-bike
Hiking shoes
-
- Tentative sideways sliding....
- Posts: 37
- Joined: Wed May 01, 2013 11:58 am
- Location: christchurch
cracking turbo manifold
Sometimes with the continuous heating and cooling of long term use and welding would not help being extreme localised heat. This causes the pipe to build up internal localised stress. . To stress releave the manifold I would crank up the Barby and cook the manifold till the whole thing is glowing red hot !!! Evenly - then let it cool slowly..... This and braces should help. :-)
Who is online
Users browsing this forum: No registered users and 8 guests