[V8RMBL]

Can any one tell me if those flexible exhaust pieces, like what they use in the little FWD rockets are available in 3" diameter

I'm thinking of bolting the exhaust solid to the body of the car, just need something to allow some movement at the front of the system.

[VLHERO]

Doesnt this have to be engineered?

[SSHatch]

You scare the crap outta yourself when you see the prices of them!!
Yes they come in 3inch but you are looking in the three figure range to buy them.

Will take some pics tonight of the setup on the Hatch and Ute and a number of other cars I know of that will I believe achieve the same result you are after at a much cheaper price, like less than $10!!

[V8RMBL]

VLHERO, on Apr 10 2006, 04:32 PM, said:

Doesnt this have to be engineered?

Yep

SSHatch, on Apr 10 2006, 04:32 PM, said:

You scare the crap outta yourself when you see the prices of them!!
Yes they come in 3inch but you are looking in the three figure range to buy them.

Will take some pics tonight of the setup on the Hatch and Ute and a number of other cars I know of that will I believe achieve the same result you are after at a much cheaper price, like less than $10!!

Awesome stuff PJ...

when u say 3 figure range are we talking another set of cats sorta price? If it means less stress on the welds I'm keen for it.

And the fact that this won't be a daily driver I'm not too fussed with annoying noises coming from the exhaust being solid to the chassis.

[SSHatch]

Talking $100+ per flex joint!
Cant remember exact prices!!

Would have thos pics for ya but am having small issues at the moment.
Kinda something to do with breaking the gear shift in the Hatch.
Actually just broke the head off a bolt but it means I gotta pull the box out I think to get the broken bit of bolt out and put new one in!!

Will give me a perfect oppurtunity to get some shots of the exhaust mounts though!!

[V8RMBL]

SSHatch, on Apr 10 2006, 06:56 PM, said:

Talking $100+ per flex joint!
Cant remember exact prices!!

Is that all I was expecting something like $400 a piece..lol

Diablo, on Apr 10 2006, 07:22 PM, said:

You just gotta ask. I will let you know tommorrow.

Cheers Mik! more than likely could be a sale in that for ya

[SSHatch]

Hatch: This and a bent piece of 15x3mm steel clamped to the exhaust and slotted through a solid rubber mount bolted to the fllor!! Not showing a pic of that as it still has coathanger wire holding it where I broke an exhaust clamp!!


Ute: simply a bit of that stuff bolted to a bracket on the floor and also on the tailpipe.
This I think from memory is the only mount on the whole system and the tailpipe will move approx 5mm side to side!

This post has been edited by SSHatch: 10 April 2006 - 07:54 PM

[V8RMBL]

in that second pic of the ute... btw lovely rust effort there

that is what I had under RMBL and that used to leap around enough to rip the welds out of the floor

Hence why I want something that isn't going to move and weaken welds and then tear bits off the car..lol

[V8RMBL]

PJ - talk to Mik next time u need flexy joints... He's advised me of a price under $100 for a meter length...


Just need nut out how to attach it into the pipe... gotta be a way around it..lol

[SSHatch]

He is talking about completely different stuff to me and personally I wouldnt use the stuff he is suggesting!!
We use a similar thing in the workshop for exhaust ducting but I wouldnt use it on a car! Doesnt appear to retain its shape that well, sags after a while. Where as the flex joints are designed for constant movement and can withstand this and retain their shape. As I said to ya the other night though, gotta be careful with the turbos and flex joints as they melt the inners of them.

For those that dont believe me I have actually held one in my hand that came out of a turbo vehicle. It had melted the inner section and then the force of the exhaust had pushed the internals into the end forming a 20mm restrictor.

I am talking about the trusty old weld in flex joints.

He would be talking about what looks like a spiral wound pipe thing.

This post has been edited by SSHatch: 12 April 2006 - 01:41 PM

[V8RMBL]

ahhh....


*goes off to do some google research*

[HR1966]

I know what you're talking about PJ. Looks like a 3" piece of braided line from the outside. I would NOT use that other stuff.

Just a question, why on earth do you want the exhaust mounted to the body of the car? It will cause vibrations, resinance, and will burn the paint off at the points where the exhaust does connect to the body. Plus puts a lot of potential fatigue on things.

Rember exhausts expand when they get hot, stainless ones a LOT more, where is it going to expand to if it is fixed solid? You would need to have some kind of slip ring arrangement, then you'll get rattles, so you'd make it out of rubber...then you have a normal exhaust.

Why do you want to do it again?

[V8RMBL]

HR1966, on Apr 13 2006, 12:59 PM, said:

Why do you want to do it again?

Well the idea was to stop the system from moving around and thus tearing the mount points off the car, the old system was held on with rubber straps, if you were to grab the system and try and move it, the movement was minimal... but the way the car was being used obviously was too much for what was holding the exhaust on because it would tear the bolts clean through the rubber (inc the washers) and also I noticed it was peeling the weld off the floor.

So I figured if it can't move to start with, it's less likely to be able to bounce around and start yanking at the mounts.

creature comforts aren't an issue...haha it can rattle and carry on as much as it likes.. I just don't wanna be welding the bloody thing back on after every time I give it some stick.

[HR1966]

Not trying to be critical, just trying to work out what you're doing and why.

I would just look at making better exhaust systems brackets. To be perfectly honest I can not see welding it solid working. It will break simply because of the stress on the welds from expansion. Seriously, think about it. Plus it'll burn the paint off the floor, heat transfers pretty darn good through steel, it'll travel a long way. I doubt it'd get engineered because the transfered heat into the floor will set your underlay and everything on fire.

Just think, if it rattles like a bitch, no matter what the car looks like, you'll pull up at the lights and people will be thinking "what a piece of s**t, rattles like a bitch". You say you're building a show car, well why cut conrers on the exhaust.

If you're breaking exhaust mounts now then you have problems. A broken engin or gearbox mount, something. Exhaust mounts aren't a consumable!

I have been around cars a LONG time and have never heard of a car having the exhaust hard mounted. If you think it is because you're motor moves around a lot then how do people like Rob Vickery, Eddy Tassone and other people like that still run rubber mounted exhausts? They are pushing 4+ times the HP you are. I've seen rods with 600-800HP motors in them with propper exhaust mounts that don't break.

Seriously reckon there is other problems. Still doubt you'll get it engineered.

[V8RMBL]

I could pin point the problem... it's when the car leaves earth briefly and lands heavily... (the car does get it's share of abuse) or when the diff travelles to it's extremidies and collects the exhaust over the diff tunnel. That's what's killing it, I need to get the exhaust to sit as close as possible to the floor of the car over the diff to try and eliminate the later...

I have no intention of babying the car

I certainly understand where ya comming from though