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Making Dutra rear manifold--cut far enough back?
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Author:  NewLancerMan [ Thu May 12, 2005 4:28 pm ]
Post subject:  Making Dutra rear manifold--cut far enough back?
Hey guys, just started cutting up my exhaust to allow for the dutra front piece. I read the instructions and cut in front of the clock mark, but wanted to make sure I had cut enough off to clear or see if I need another 1/2" or so off.

I cut right where the gusset finishes bridging the two halves of the manifold in the middle. Here are two pics:

Image Image

I know several of you run this and could tell me. It looked pretty close to this one from Doug's instructions but I didn't want to have it welded only to find its too long. Thanks guys!

MJ
Author:  Patrick Devlin [ Thu May 12, 2005 7:37 pm ]
Post subject: 
Looks great to me! That's about where I cut mine.
Author:  NewLancerMan [ Fri May 13, 2005 5:26 am ]
Post subject: 
Thanks pat, last thing I wanted to do was deal with welding cast iron and find out I hadn't cut off enough in the first place and have it hit! :D

udaman
Author:  Doctor Dodge [ Fri May 13, 2005 6:38 am ]
Post subject: 
That is the place to cut, looks good.
Now comes the hard part, fitting the cap-off plate and doing the welding.
For a weld-on cap, try to leave a good amount of exposed cast iron around the cap so you have good area for weld penitration. Per heating the assembly helps the welding process.
DD
Author:  NewLancerMan [ Fri May 13, 2005 11:11 am ]
Post subject: 
Thanks Doc! Glad to hear from you that I've not botched it so far ;-)

Quick question: would you suggest tapping two bolts to hold the cap in place, then welding it on? Or trying to tap 4 bolts and skipping the weld and use high temp sealant of some kind. I think Jim might be able to help me weld the cast iron, so that would make a big difference

MJ
Author:  Patrick Devlin [ Sun May 15, 2005 5:20 pm ]
Post subject: 
Definitely weld it if you can. You don't want to have to pull that thing back off for exhaust leaks.
Author:  Al Rose [ Mon May 16, 2005 5:40 am ]
Post subject: 
I would suggest placing your unit in vermiculite after welding to let it cool down slowly, so you won't get any cracks in your welding.
You can get it at plumbing/heating supply stores. Not that expensive. 8) [/i]
Author:  NewLancerMan [ Mon May 16, 2005 6:24 am ]
Post subject: 
ok Al I'll check into that. I was going to use a box of play sand and try and wrap it. I'm running out of time here so it may have ot wait until I get to CA. Of course, then I lose access to the welder! Ah well. Something will work out. I guess I may be forced to go for the screw in method at that point.

Thanks for giving me all this great advice!

MJ
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