Exhaust Flexy Pipe & Manifold Questions.

[Tricky-Ricky]

First question, what would be the preferred length of flexy pipe to graft into a 3" down pipe, 250mm or 100mm?

Second question, regarding a tube manifold, leave it as is SS, spray with VHT paint (will it just flake off SS?) wrap it with heat wrap? how much does it take?

[Robert]

have you got some 3" flexi pipe?

[Kev.O]

First question, what would be the preferred length of flexy pipe to graft into a 3" down pipe, 250mm or 100mm?

Second question, regarding a tube manifold, leave it as is SS, spray with VHT paint (will it just flake off SS?) wrap it with heat wrap? how much does it take?

 

I used 50 foot of 1" wrap, and it was just enough.

[bolarbag]

How long along the exhaust pipe can you go without fitting a flexy section?

 

I dont have a flexy section in my system until the resonator box - thats held on with springs, I have a 4inch system turbo back, connected with v-band clamps,

 

If I secure the midpipe, I'll be minimising flex in the system, but am I at risk of putting stress on the manifold with no flexisection on the downpipe, its a lot of weight for the manifold to be supporting

[Tricky-Ricky]

How long along the exhaust pipe can you go without fitting a flexy section?

 

I dont have a flexy section in my system until the resonator box - thats held on with springs, I have a 4inch system turbo back, connected with v-band clamps,

 

If I secure the midpipe, I'll be minimising flex in the system, but am I at risk of putting stress on the manifold with no flexisection on the downpipe, its a lot of weight for the manifold to be supporting

 

I have no flexy in there at present, and i am just about to fit a single turbo so i would like to fit one in the down pipe to avoid putting too much stress on the Vband, i can get either a 250mm which will give plenty of movement but i suspect it will be just too long or a 100mm section which would be better space wise, but will it be enough flex?

[bolarbag]

I think any flex is better than none, its just the weight of the turbo, dp/mp I'm worrying about on the manifold, its a Full Race, so pretty sturdy but dont want to put anymore forces on it than necessary,

 

The weight would still be there with a flexy section as its tensile strength comes into play and makes it solid but horizontal forces from vibration of the engine would be dampened through the flexy, as would be any weight/forces coming from the midpipe, while cornering e.t.c

 

The longer the flexy the better but the best solution would be two pipes held together via springs, but as the dp has so much heat going through it, it would be hard to fab something up thats not gonna break off in the near future

[Tricky-Ricky]

The manifold is an XS power one (not new) has got a couple of upper strengtheners, i may even add more, and perhaps look into fabricating a bottom support similar to the std twin one, was going to get a 100mm flexy for the down pipe, to avoid strain on manifold and V ban junction, but now i think about it, there is a brace on the first cat/decat join, that maybe i can still utilise, what do you think?

[bolarbag]

The manifold is an XS power one (not new) has got a couple of upper strengtheners, i may even add more, and perhaps look into fabricating a bottom support similar to the std twin one, was going to get a 100mm flexy for the down pipe, to avoid strain on manifold and V ban junction, but now i think about it, there is a brace on the first cat/decat join, that maybe i can still utilise, what do you think?

 

Some torque dampener bolted to one of the bolts on the manifold exit flange and maybe to a chasis leg or even the block would prevent the need for anymore upper strengtheners,

 

I'm not sure what brace you mean, is it the flexy part in the standard exhaust?

[Tricky-Ricky]

Some torque dampener bolted to one of the bolts on the manifold exit flange and maybe to a chasis leg or even the block would prevent the need for anymore upper strengtheners,

 

I'm not sure what brace you mean, is it the flexy part in the standard exhaust?

 

Not quite sure what you mean by torque damper? would have to be from manifold to the block, you add more stress by bolting to the chassis, i was referring to the brace that bolts to the first cat junction and the gearbox.

[bignum]

Ive made a support bracket which bolts to the original bracket on the gearbox, its shaped out of some beafy angle iron i had lying around and is then clamped near the v-band to mid exhaust section. I don`t think its the weight of the exhaust which is the problem,its the movement of the engine which puts stress on an unsupported system, i`ll take some pics if anyone wants.

[bolarbag]

yes please!

 

Ah I remember that one now, yeah definitely an option

[adi2009]

First question, what would be the preferred length of flexy pipe to graft into a 3" down pipe, 250mm or 100mm?

Second question, regarding a tube manifold, leave it as is SS, spray with VHT paint (will it just flake off SS?) wrap it with heat wrap? how much does it take?

 

 

Hi mate, on my downpipe I m using a 6 inch (150mm) flex pipe section and it seems to be holding up fine so far.

[Tricky-Ricky]

Thanks for all the input:) bignum, a pic would be most helpful,

adi2009, thanks, it sounds like i could use the 100mm one and save some space,

Been having a further think on this, and i am now starting to go along the lines of brace the manifold/WG to the block, beef up the bracket that bolts up to the gearbox, and maybe put the flexy joint in the front section of the second decat pipe?

[adi2009]

Dick, my flexi section is on the downpipe itself, couple of inches after the wideband and O2 bungs. Would be great if you could send me some pics of your manifold with the additional support braces, got to beef up mine before it cracks. Cheers

[Tricky-Ricky]

You have PM, as said i haven't actually done mine yet, just kicking around a few ideas;)

[bignum]

Here`s a picture of my contraption,

There`s another mounting bolt on the horizontal plane.

Edited May 22, 2008 by bignum (see edit history)