Exhaust hanger options

[boat737]

Just curious, what are the options on the mid pipe exhaust hangars. I guess some don't use any, and others use a single point hanger? What are the disadvantages of using the FFR 2-point hanger? Thanks. If you got pictures, It's worth a thousand words ya know.

[BEAR-AvHistory]

I uses a single hanger made from normal exhaust pipe hanger fabric. They are under very light tension. Main support is a home made turn-buckle hanger mod that connects my J-Pipe to an upper chassis tube just inside the body shell.

[ram_g]

I use the FFR hanger with only one bolt installed. If you look at the sidepipe in an engineering sense you want a vertical support there, not a torsional restraint also. Connecting both bolts will make it a torsional restraint and then you have a metal fatigue problem right at the connection of that flange with the sidepipe wall.

[Gumball]

I effectively turned the mid-pipe brackets into what is a standard exhaust hanger - here's my "how-to" thread.....

http://thefactoryfiveforum.com/showthread.php?9382-Sidepipe-Brackets-My-attempt-at-avoiding-cracks-in-bracket-mounting-flanges

[CraigS]

10 yrs and 38,000 miles w/o a hanger and all is well.

[boat737]

Thanks all.

Kevin: Any pictures?

ram_g: Did you use a bushing on the one bolt? (a loose fastener?) or is it tightened down? (if it's tightened, it seems you would have the same problem you are trying to avoid.)

Chris: Any problems since you went with this hanger setup? Looks nice and simple. like my mind.

CraigS: Did you start out with no hanger, or did you have the "4 point" FFR setup early on and it failed? My college engineering classes (from 40 years ago) and my common sense are screaming at me that having all that weight swinging out there with no support just won't work. Just like pushing some air out of a jet engine tailpipe won't move a 400 ton airplane. But it does. Go figure.

[ram_g]

ram_g: Did you use a bushing on the one bolt? (a loose fastener?) or is it tightened down? (if it's tightened, it seems you would have the same problem you are trying to avoid.)


Your reasoning is correct. I have a bolt and nut that is deliberately just a hair loose. The nut is a distorted thread all-metal lock nut, so it isn't going anywhere. Didn't use a elastomeric lock nut because of the heat.

(By the way, this is the same as the nuts that I have on the sidepipe flanges...wanted to use locknuts there too but didn't want to use the normal elastomeric kind. Bought the distorted shape ones from McMaster and they work great.)

[Paparazzi]

Plenty of discussion on this topic on the other forum. I believe the view points are often driven by whether you're running J-pipes; if so you should use the hangers, if you have 4-into-4s, they're not so critical.

[Gumball]

Chris: Any problems since you went with this hanger setup? Looks nice and simple. like my mind.




No problems at all - 4-into-4 headers and stock FFR sidepipes. The car has been on the road for a couple summers and has traveled just shy of 6,000 miles.

[AC Bill]

Didn't use a elastomeric lock nut because of the heat.

Ram, The stover nuts, which i believe you are referring to, are good added security, but I have used nylock nuts on my side pipe brackets for 5000+ miles, and they haven't been affected by heat. I had them off recently for paint, and they still retained their locking ability, with no sign of heat distortion.