modified cast manifolds
modified cast manifolds for you turbo experts, im considering cutting 1 tube off of a truck manifold and using a few sch. 80 weld sockets to make an extra bend in the manifold before it meets up with the rest of the cylinders. I wont be doing the welding, there is a cast iron guy by me who does amazing work. My concern is, will the weld sockets I add in be more likely to crack because of the 2 different metals expanding differently? I figure it wouldnt be a problem N/A but im worried about the extra heat. I would really like to use the truck manifolds for the sake of keeping it simple rather than building something custom for one side of the motor. Thoughts?
so something like a log manifold might hold up better even with all the extra welded spots? I figured the more welds the worse it would get, and actually though the modified manifold was simple. Stupid 
FormerVendor
Joined: Dec 2001
Posts: 2,444
Likes: 2
From: WWW.SPEEDINC.COM
I did this with truck manifolds and schedule 40 pipe fittings. I beveled the manifolds and pipe fittings, pre and post heated with an acetylene torch and just mig welded them to the manifolds. It welded clean and I haven't had any problems with them so far. No turbo supports, going on 2yrs and 7000 miles.
Now, if you are going to just modify one runner on a truck manifold I'm not sure how well that would hold up. May end up cracking due to dissimilar expansion rates.
Now, if you are going to just modify one runner on a truck manifold I'm not sure how well that would hold up. May end up cracking due to dissimilar expansion rates.
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I think im just going to give it a shot on cutting that first tube off and moving it and hope for the best. Might even throw some v-bands on the collectors while im at it. Thanks for the pics as well guys.
