Cascade Crew

83Z28BlackBetty · Posted: Mon Mar 05, 2012 2:39 pm Post subject: DIY SFC's

So the way my exhaust is routed, I can't a conventional sfc on that side. so I'll be building my own. My main question, what size tubing and what thicknesses sidewall?

-jake

Quasi-Traction · Posted: Mon Mar 05, 2012 3:52 pm Post subject:

1/8th" thickness should be sufficient. I used 1"x 2" with a 1/8" wall thickness rectangular tubing for mine, and it saved my exhaust from damage, even when a couple of the welds broke from the rocker pannel in the accident.

Just make sure you get sufficient penetration, Pull the carpet up, and clean the road gunk off thoroughly. I did 1/2" welds every inch for the main piece that ran along longitudinally past the door and rocker pannel.

Twilightoptics · Posted: Mon Mar 05, 2012 5:36 pm Post subject:

I might go 3/16" if it was 1"x2" tubing. 2x2 1/8 would be fine.

My experiance showed the cross braces welded to the sub frame in the front are nearly the most important pieces. I added 2 more on mine and it made a big different from the original MOO design which was 2x2x1/8 IIRC.

chevymad · Posted: Mon Mar 05, 2012 5:41 pm Post subject:

The Moo design was basically a copy of spohn but in square tubing. And yes.. 2x2x0.125 with a couple pieces of 1" schedule 40 for the cross braces. Where did you add the extra ones Paul? Still have a photo?

Twilightoptics · Posted: Mon Mar 05, 2012 6:28 pm Post subject:

You cant kind of see it in this pic. Just a short one you put in where the subframe goes outward, then I added another on both sides farther back where the subframe gets narrow.

http://www.cascadecrew.org/phpBB2/garage.php?mode=view_gallery_item&image_id=798

Reason being the original exhaust I had was too high for the sched 40 pipe so we used a piece of like 3/4" rod. Once I changed to dual exhaust I put the second set of schedule 40 pipe braces in.

chevymad · Posted: Mon Mar 05, 2012 6:36 pm Post subject:

Was the 3/4 something I had? I think i picked up something that size for my homemade wonderbar. Was very heavy wall but smaller diameter. Kinda remember that.. but man.. its been awhile since we did that.. You didnt even know how to weld yet! lol

Twilightoptics · Posted: Tue Mar 06, 2012 3:45 pm Post subject:

Think it may have been solid. Really don't remember. Definitely long ago. I think it was right after I got the 350 in originally. Kept getting o2 lean codes on the way home. All the old days of LEARNING how to tune. Now it's just tuning. :O)