I was runnung the car up today and the exhaust came loose

the rear mounting and its rivnut had come out of the chassis rail and was just hanging.

I had put a rivnut into the bottom of the lower chassis rail and I was using an "L" shaped bracket.

On the long leg of the "L" i was using a rubber bobbin to fix the exhaust.

there appears to be a couple of problems with this. one is the turning moment pulling the bracket down and pulling the rivnut out of the chassis, the other is the vibration has possibly enlarged the hole so the nut has just fallen out.

what have others done to fix their exhausts?

David Jenkins uses a bobin through the side panel. but he has alloy panels and i have fibreglass.

i have only used one bolt underneath, should i put a second through the floor?

your help is needed

Ditch

I welded up two T shaped brackets. Put a rivnut into the bottom and side of the chassis tube and then mounted the exhaust on 'mini' exhaust type bobbins. Nothing has falled off yet !

See diagram

excuse the diagram spelling of rivnuts, I was having an 'Allo Allo' moment


[Edited on 29/4/07 by givemethebighammer]
Rescued attachment exhaust mount.jpg

personally i wouldn't use rivnuts to support a silencer, they are just not up to the job, most silencers and between 3-7kg's so you are gonna have to use something that is tough enough to do the job,

i have use a 4mm L-shaped bracket mounted to a coton real shock which is mounted to a 4mm bar of steal, which is bolted to the chassis with 2 x m10 bolts.( mind you my silencer weighs like 7kg)

just my 2p's worth, but it may spur some imaginative thinking

I drilled through the grp side and made a mounting plate attached to the chassis side box sections. Bobbins screw into welded nuts on this. Neat and strong !
Rescued attachment exhaust bobbin.JPG

I was thinking of welding a couple of tabs onto the underside of my chassis raill, and having them come out underneath the silencer at both ends to support it, with rubber doughnuts to absorb the vibration & tuning moments...does this sound good?

quote:

---

Originally posted by ditchlewis
David Jenkins uses a bobin through the side panel. but he has alloy panels and i have fibreglass.

---

Looks like the drivers seat is comming out then.

i have panelled the inside of the car in alloy sheet so i cannot weld a bracket on to the frame.

i also have a neoprine mini exhaust mount shaped like a T this requires 2 bolts to fix and i will have to drill right through the chassis from the outside to the inside.

since i have a layer of alloy and then fibreglass over the chassis rail, so i cannot weald up the origina mounting hole, what is the best way to fill it?

By the way David, Jake was most impressed with your car and said it awsome..


Ditch