Longer exhaust bolts

[AL3X_]

The spring bolts which connect the centre section to the downpipe, seems to be a bit loose-ish fitting on my new manifold, and maybe the reason the gasket didn't seal without paste, is it possible to get bolts with a longer thread on them as on the saxsport website that comes wth the saxsport exhaust?

[DreamEater]

The spring bolts which connect the centre section to the downpipe, seems to be a bit loose-ish fitting on my new manifold, and maybe the reason the gasket didn't seal without paste, is it possible to get bolts with a longer thread on them as on the saxsport website that comes wth the saxsport exhaust?

Best option to go for is an Engineering shop, they can supply any nut/bolt you may require. And are fairly cheap.

Certainly helped me out when I forgot to tighten up a 15mm bolt holding my alternator on, luckily the belt kept the alt from falling down completely, squealed like a bitch though!

Dave.

[AL3X_]

Are these exhaust ones not a specialist item though mate? I thought you might be able to get them from a saxo specific website lol, they have what looks to be them on eBay but seem to come as a kit.

[DreamEater]

Are these exhaust ones not a specialist item though mate? I thought you might be able to get them from a saxo specific website lol, they have what looks to be them on eBay but seem to come as a kit.

Nope a bolt is a bolt!

And they are all going to rust on no matter what kind of coating you can get on them, a few years under the car subject to extreme heat/cold, rain and other shite will make most things seize and rust!

Dave.

[swampy]

Nope a bolt is a bolt!

And they are all going to rust on no matter what kind of coating you can get on them, a few years under the car subject to extreme heat/cold, rain and other shite will make most things seize and rust!

Dave.

wrong!!!
An 8.8 is very different to a 12.9 which is different to a stainless steel.
They may all in theory do the same job, but there suitability for a set job differs.

Im sure the manifold bolts have a roune shaped base to them unlike any bolt i have ever come across.
The kit on ebay and citroen has 3 length bolts in for what reasom im not sure .
I have some spares if you can measure the length of yours.

[DreamEater]

wrong!!!
An 8.8 is very different to a 12.9 which is different to a stainless steel.
They may all in theory do the same job, but there suitability for a set job differs.

Im sure the manifold bolts have a roune shaped base to them unlike any bolt i have ever come across.
The kit on ebay and citroen has 3 length bolts in for what reasom im not sure .
I have some spares if you can measure the length of yours.

http://euler9.tripod.com/bolt-database/22.html

Doesn't appear to be much difference... just how much stress they can handle.

But if I'm wrong, I'll gladly be educated.

Dave.

[swampy]

Which makes them very different for the applications they are suitable for.
You wont walk in to any engineering supplier and find the correct shaped bolt for a citroen exhuast bolt..
I use four different suppliers none can get them for me off the shelf but all of them can have them madeto order for me!

The bolt itself is an m6 thread, its the shape of the under side of the bolt head that makes it special.

[DreamEater]

Which makes them very different for the applications they are suitable for.
You wont walk in to any engineering supplier and find the correct shaped bolt for a citroen exhuast bolt..
I use four different suppliers none can get them for me off the shelf but all of them can have them madeto order for me!

The bolt itself is an m6 thread, its the shape of the under side of the bolt head that makes it special.

I stand corrected.

Dave.

[AL3X_]

Im sure the manifold bolts have a roune shaped base to them unlike any bolt i have ever come across.
The kit on ebay and citroen has 3 length bolts in for what reasom im not sure .
I have some spares if you can measure the length of yours.

The manifold to head bolts I'm just using some stainless allen head bolts with washers mate, looks a lot cleaner, its the manifold downpipe to centre section I need. They have a rounded base like you say which allows the bolts to pivot with the spring mechanism the joint has, Yeah i'll measure the length of mine shortly, its not so much the length I need different but the length of thread, as my nuts get to the end of the thread before the spring is really tensioned on the joint, it seals but I have a feeling it would be better being slightly tighter like the original joint.

[chinkostu]

theres different lengths, i've got some from a 306 on mine as they're longer and easier to tighten when the cars not jacked up much ;)

[Bedford126]

I got solid bolts on mine. The old exhaust builder fitted my exhaust at work and he said there is enough flex in the rubbers to take the vibration and she springs are not needed.

up to you though but I have never had any knocking or vibration from the exhaust and engine and its been on about a year and a half now (Supersprint and Raceland manifold)

[AL3X_]

theres different lengths, i've got some from a 306 on mine as they're longer and easier to tighten when the cars not jacked up much ;)


Does the 306 have longer threaded bolts then?

I got solid bolts on mine. The old exhaust builder fitted my exhaust at work and he said there is enough flex in the rubbers to take the vibration and she springs are not needed.

up to you though but I have never had any knocking or vibration from the exhaust and engine and its been on about a year and a half now (Supersprint and Raceland manifold)

Ah I see mate, so basically if I remove the spring, cup, nut and bolt and just fit a standard nut and bolt with washers either side and tighten till its all together? This might help mine, my old mazda had this done on the rear silencer where it was meant to be springs and I never had a problem with that either....I'm assuming its easier to get a tight seal as well?

[Paul]

I wouldnt remove the springs...

Your exhaust will eventually snap under the pressure of the engine rocking forward and backwards. I've had over 20 saxos and seen this happen numerous times.


Bedford you must have some very flexible rubbers or just plain lucky.

The springs inbetween the nut and bolt are there for a reason.

[AL3X_]

Ah, so would you say some longer threaded bolts would be a better idea?

[chinkostu]

Does the 306 have longer threaded bolts then?



i'll double check the thread but they're definately longer

[AL3X_]

If you could please mate, basically i need some that can be the same length as mine which are 7 cm including the bolt head and thread length, but the lenght of thread on mine is 1.5cm whereas i need a bolt which if it is the same length the thread travels further down the shaft bit towards the bolt head which will allow me to tighten the joint tighter?

[AL3X_]

Does anyone think a motor factors will stock these if i take down my bolts and say i want some with longer threads.

[axsaxoman]

cheap manifolds with thin flanges + or cheap exsystems with thinner than std flanges cause these problems .
you can always replace std bolt with long 8mm or 10mm bolts ,depending on hole sizes in manifold and use the springs and usedouble nuts locked against each other on bolts when tightened up to desire spring compression

[AL3X_]

Thats exactly my problem mate...its a sportex manifold(only cost me 30 quid so i thought why not as my cat had rotted) and the flange is a thin one which can be slid about...so needs some longer threaded bolts....do you just mean to get long standard bolts and use these? The only prob with this is they dont have the pivoting bit for the centre section flange...id like to keep this if possible so i might try my motor factors today.

[swampy]

Afaik the ones with a radius head are peugeot citroen dealer parts.
How much bolt sticks past the spring before you tighten it up?

[AL3X_]

Ah I see mate, and how do you mean mate? I cant quite remember theres not that much just enough roughly to put the nut on but with it being a thin flange it needs more thread to tension the spring more?

[axsaxoman]

your loose flange and using springs will allow all the flexibility you need ,whilst keeping it gas tight ,presuming you are using correct sealing ring

[AL3X_]

Ah I see mate, i'm using the correct sealing ring from my reg number, this will be the same for a standard and sportex manifold won't it? I did goto the motor factors and ask for a fatter sealing ring but that was way too fat and just fell apart when I tightened the bolts, the one matched to my reg number fits pretty much perfect just has an ever so slight leak with standard spring bolts?