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#1 |
Super Newb
Join Date: Apr 2009
Location: Layton, Utah
Posts: 142
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a different exhaust question.
Tonight I'm gonna weld up the exhaust for my 66. I just barely finished the new 350 transplant, and started it for the first time last night. Before I spend 20 minutes breaking in the cam, I figured I better put some mufflers on so I don't piss off my neighbors.
I bought some exhaust pipe from the local master muffler to use. From what I can tell, it is the exact same thing as EMT(electrical metallic tubing). Is there really a difference? I think that EMT is galvanized so I really need to hold my breath if I weld that stuff. I could be wrong. So my question is: what is the difference between plain old exhaust tubing from master muffler and EMT? |
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#2 |
Registered User
Join Date: Nov 2010
Location: Monroe Wa.
Posts: 50
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Re: a different exhaust question.
Check here it might give you what your looking for.
http://66.154.44.164/forum/showthread.php?p=1063557
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63 C20 Fleetside LWB ![]() |
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#3 | |
Super Newb
Join Date: Apr 2009
Location: Layton, Utah
Posts: 142
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Re: a different exhaust question.
Quote:
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#4 |
Registered User
Join Date: Nov 2010
Location: Monroe Wa.
Posts: 50
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Re: a different exhaust question.
I have used it in many applications and it welds fine. It is nasty to breath it but the good thing is that it wont kill you it might make you sick for a day or so if you breath large amounts of it though. Just try to grind off the galv in the areas your gonna lay your bead and wear a respirator. Here is the MSDS for it......good luck bud
http://www.atlassupplycorp.com/Conte...galvanized.pdf
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63 C20 Fleetside LWB ![]() Last edited by jarkill; 11-09-2010 at 02:30 PM. |
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#5 | |
It's Better With Nitro
Join Date: Apr 2008
Location: Chino Hills, CA
Posts: 2,261
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Re: a different exhaust question.
Quote:
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1963 C-10: Deluxe-optioned cab, shortbed, fleetside Pontiac 462 ci, Kauffman D-Port alum. heads 4L80E, narrowed sheetmetal Ford 9-inch Tubular front and rear suspension Custom 6-piston front disc and 4-piston rear disc brakes |
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#6 | |
Account Suspended
Join Date: Sep 2009
Location: High Plains of Colorado
Posts: 2,485
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Re: a different exhaust question.
Quote:
That's why it's better to use an applicable dust respirator and remove the galvanize before you paint. Once welded the galvanize turns into gas fumes which are easily breathed and enter your lungs. Even then the fumes settle inside your helmet and in your workshop. The best method for those of us that don't have fume extraction and the correct safety gear is to not weld on galvanize, period. When I did my exhaust last month I used the aluminized tubing.... My ex-brother in-law was a welder for a living. Back in the late 70's he welded some galvanized steel.. lost his appetite, said nothing tasted good anymore. They told him to drink milk, and that was supposed to make him feel better. When it was all said and done he was in and out of doctor's offices, lost 20 lbs and missed a months worth of work. It ain't worth taking chances with your health. Who's lookin' out for ya? Last edited by lakeroadster; 11-09-2010 at 03:17 PM. |
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#7 |
Account Suspended
Join Date: Jul 2007
Location: Plumas Lake, Ca.
Posts: 1,009
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Re: a different exhaust question.
Aren't you supposed to break in the cam on initial start up?
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#8 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: a different exhaust question.
Yes that is very critical, especially with today's oils and a flat tappet cam. As soon as the engine is fired, the 20+ minute cam breakin should start. Hopefully the OP is using a good breakin additive.
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#9 |
Registered User
Join Date: Sep 2008
Location: San Carlos, Ca.
Posts: 3,048
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Re: a different exhaust question.
I'm an electrician by trade and the EMT that we use now is not a hot dip galvanize like we used to use but guaranteed, it DOES flare up just like the old stuff and produce vapors. Might not be enough to cause rigormortise but can easily make you sick nonetheless and welds like crap if you don't clean it well. I too have used it for exhaust because it was cheap, I have the bender and I didn't know better. I bent it up and had an exhaust guy weld it up for me. When I came back, he was ready to kill me for not telling him it was galvanized. I'd just use the aluminized stuff anymore. Is the EMT that much cheaper?
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Chris '63 k15 long step Vortec 7.4 - L29 Blackbear tune, Five 0 Motorsports injectors, Chris Straub Cam, NV4500, divorced 205 ![]() 52" front and 63" rear spring swap D44 / 14bff - disc axles Milemarker 9K and 10.5K hydraulic winches 63" & B52 Spring Install http://67-72chevytrucks.com/vboard/s...ng+swap+thread NV4500 Reverse Build Thread http://67-72chevytrucks.com/vboard/s...=reverse+build L29 - 7.4 Vortec Build http://67-72chevytrucks.com/vboard/s...&highlight=L29 |
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#10 |
Super Newb
Join Date: Apr 2009
Location: Layton, Utah
Posts: 142
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Re: a different exhaust question.
So it turns out that I am now dead. I am posting this from the grave to let everyone know that welding galvanized is very very dangerous.
No, really. |
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#11 |
Super Newb
Join Date: Apr 2009
Location: Layton, Utah
Posts: 142
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Re: a different exhaust question.
I went to Home Depot, and it turns out they don't even sell conduit bigger than 2 1/4", so I'm just gonna get my pieces from an exhaust shop anyway.
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#12 | |
It's Better With Nitro
Join Date: Apr 2008
Location: Chino Hills, CA
Posts: 2,261
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Re: a different exhaust question.
Quote:
![]() If so, then is should be aluminized steel.
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1963 C-10: Deluxe-optioned cab, shortbed, fleetside Pontiac 462 ci, Kauffman D-Port alum. heads 4L80E, narrowed sheetmetal Ford 9-inch Tubular front and rear suspension Custom 6-piston front disc and 4-piston rear disc brakes |
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#13 | |
Account Suspended
Join Date: Sep 2009
Location: High Plains of Colorado
Posts: 2,485
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Re: a different exhaust question.
Quote:
But then we also know people who haven't. It's all what your comfortable with. Or another way to put it: If someone were to take a revolver and put one bullet in the chamber, spin the chamber, put the barrel to their head and pull the trigger they would have a 5 out of 6 chance nothin' will happen. That's over 80%! Life... it's all about playin, or not playin, the odds. Last edited by lakeroadster; 11-10-2010 at 08:40 PM. |
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#14 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: a different exhaust question.
I have used EMT because it is the cheapest stuff you can get, and you can find benders for it pretty easily. A flap wheel works quite well for getting the plating off. However, note that it does NOT come in standard fractional ODs, which can be a problem is you are trying to slip-fit normal mufflers onto it. Other than that, I have no complaints.
http://www.home4c.com/conduit.htm Ray
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Live more responsibly. Eat lower on the food chain. Eat vegetarians. Last edited by raycow; 11-11-2010 at 05:05 AM. |
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#15 |
HOW long until spring??
![]() Join Date: Mar 2009
Location: Star Idaho
Posts: 1,413
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Re: a different exhaust question.
As a master electrician I usually have access to EMT on a daily basis.
My exhaust systems are 2" EMT, and my shop has big hydraulic benders. But you guys are correct- welding on ANY galvanized metal of any kind is dangerous. But we have to do it. Take precautions! Go outside with good ventilation. keep your face out of the fumes Be quick! Use short quick welds and do not run un-necessary large welds I will always set a fan up and blow fumes away with prevailing breezes.
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69 chevelle convertible 71-C-10 short-wide and low ![]() 64 C-10 custom shortbox "Bubba"s Recycling project" |
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#16 |
gets board easy.......
Join Date: Mar 2009
Location: Colorado Springs
Posts: 717
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Re: a different exhaust question.
I have never heard of people running EMT as exhaust, but what ever works i guess.
Over the last 15 years all i have ever used was aluminized pipe. Its designed for exhaust and it wont look cheezy as far as bubbas truck, most people dont have access to a 2 inch bender for EMT.. What wall thickness is it anyway? |
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#17 | |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: a different exhaust question.
Quote:
Ray
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Live more responsibly. Eat lower on the food chain. Eat vegetarians. |
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