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Old 07-19-2018, 08:32 AM   #1
79powerwagon
 
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Tips for fabricating charge piping

Im going to be changing the intercooler setup in my 79 and was wondering if anyone had some tips for fabricating charge piping from mild steel. Using a Small miller mig. Have a couple sets of 2nd gen piping to work with.

Now ive done exhaust systems and rigged up some charge piping but it wasnt necassarily pretty. Id like this set to be presentable.

I will likely be making a few pie cuts. Is there a better way to join these pieces than just butting them up? Better to use a 3 od piece to slip inside piping? Man up and buy some mandrel bent stuff?
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Old 07-19-2018, 08:41 AM   #2
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man up and buy some mandrel bent pieces. pie cuts are extremely hard to make look presentable for the average Joe in his garage. vrs buying $100 worth of perfects bends and simply cutting straight and welding seams.
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Old 07-19-2018, 08:59 AM   #3
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John Schirado over at GTS just did a post on pie cuts.
https://www.facebook.com/GranbyTruck...07563195941556

He makes them look pretty damn sexy.
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Old 07-19-2018, 09:06 AM   #4
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With a mig pie cuts tend to look like chit. Not to mention you are opening yourself up for sugaring the inside and getting slag into your intake ten fold when you create such a large amount of butt joints to weld.
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Old 07-19-2018, 09:38 AM   #5
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go no more course than 80 grit flap wheels; prep, prep, and when you think you've prepped, do it again. I like the 3" roloc version on a right angle air grinder/tool/whatever. I like flappers because they have a softer feel and are easier to control when sanding tubes.

make sure your cuts are square, and the tubes match each other.

use 0.024" wire, and if your machine has auto-set, use it. if not, test your settings on scrap pieces. much better to take some time to prep some scrap and test the welder than to have to scrap a full-sized piece that you've already fit up (and probably don't have extra pieces to duplicate)
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Old 07-19-2018, 09:47 AM   #6
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Buy a couple full donuts and you'll be able to make all the bends you need.
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Old 07-19-2018, 10:03 AM   #7
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I will never mig another set of pie cuts.
Spent forever getting a perfect fit up, only to have them look like dog chit in the end.
Tig if you insist on using pie cuts, but mandrel bends come out cheaper if you value your time.
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Old 07-19-2018, 10:38 AM   #8
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Thanks all.

Will definately try some smaller wire also.
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Old 07-19-2018, 02:52 PM   #9
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After you think your done look inside to make sure you don’t have mig wire hanging in there that can come loose and trash your engine, or turbo etc
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Old 07-19-2018, 05:21 PM   #10
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For the love of God, get some mandrel bends and go from there.
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Old 07-19-2018, 08:08 PM   #11
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Quote:
Originally Posted by RacinDuallie View Post
For the love of God, get some mandrel bends and go from there.
Allergic to pie?
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Old 07-19-2018, 08:16 PM   #12
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As long as it doesn't leak, and no slag in the pipe, who cares. Engine don't care
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Old 07-19-2018, 08:19 PM   #13
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Originally Posted by 79powerwagon View Post
Allergic to pie?
If that was clean and painted, it looks as good or better than a few strong running pro street trucks I've seen. They ain't worried about show quality.
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Old 07-19-2018, 08:22 PM   #14
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I will get some mandrel bent once im ready to do compounds

Atleast got the cooler in.
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Old 07-20-2018, 12:35 AM   #15
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If you're open to buying new tools (and really, who isn't?), a belt sander is a dream for doing pipe fit up as you can make sure each joint is flat. Mandrels are nice assuming you don't need real tight radius bends. Pie cuts for the win if thats the case.

Do short stitches and move decently quick with a mig. Always sucks to lay a nice bead just to have it droop and blow a hole at the end.
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