weird mark on my exhaust tip

[RaihaX]

Hey guys,

Got this mark on my exhaust tip not sure if its "burnt" or is just dirty? I have tried using claybar/wheel cleaner/polish to try to remove it but no go.

Anyone know what it is? It was sort of blue-ish purplish and now is like this colour.

Is kinda annoying seeing it

[Zuzu]

Hard to tell Ray from the pix, but it looks like the chrome is becoming transparent..

[RaihaX]

Let me get some better pics and post again.

[Tit]

Are the tips chromed or polished metal? If it's metal, you could hit it with brasso or silvo....

(but if it's chromed, brasso and silvo will wreck it...)

[Dr Stig 2]

I used to dream of getting the "blueing" on the exhaust of my K1200RS.
I could never get it hot enough to get the true rainbow effect.

Your tip looks thin enough to get a good heat distribution, so blueing may be a distinct possibiltiy.
Its a badge of honour on a bike.
Cant see it being too bad a think on the car either.

[RaihaX]

Originally Posted by Tit

Are the tips chromed or polished metal? If it's metal, you could hit it with brasso or silvo....

(but if it's chromed, brasso and silvo will wreck it...)

Is there any easy way to find out?

Originally Posted by Dr Stig 2

I used to dream of getting the "blueing" on the exhaust of my K1200RS.
I could never get it hot enough to get the true rainbow effect.

Your tip looks thin enough to get a good heat distribution, so blueing may be a distinct possibiltiy.
Its a badge of honour on a bike.
Cant see it being too bad a think on the car either.

I kinda thought it was the "burnt" effect but I just find it weird that it is happening on one part of the tip only ?

Couldn't get more photos cause our bloody power went out for about 4 hours and I couldn't open the garage door to get some light in...

[Tit]

Originally Posted by RaihaX

Is there any easy way to find out?

To the naked eye it's obvious - metal or 'foux-metal'...hard to explain...the chrome is a shiny coat, not naked metal. I think the PE is polished metal...

Brasso is a lightly abrasive polish - think army people polishing belt buckles and Jeeves polishing your homewares...

I used it on the JCW exhaust tips to get off 30000km of build up off....brought the shine up nicely...

[Smiley1175]

RaihaX,
I'll take the exhaust off your hands ... seems you need a new one now!

You can't have that blemish on your car

[RaihaX]

Originally Posted by ianf

Pretty sure the BMW PE tips are not chromed, but polished SS ? Try rubbing with petrol or tar remover.

I might try that

Originally Posted by Tit

To the naked eye it's obvious - metal or 'foux-metal'...hard to explain...the chrome is a shiny coat, not naked metal. I think the PE is polished metal...

Brasso is a lightly abrasive polish - think army people polishing belt buckles and Jeeves polishing your homewares...

I used it on the JCW exhaust tips to get off 30000km of build up off....brought the shine up nicely...

Yeah I don't think it is chrome - doesn't look like Chrome

Originally Posted by Smiley1175

RaihaX,
I'll take the exhaust off your hands ... seems you need a new one now!

You can't have that blemish on your car

you wish!

[Blauweisser]

The tip is likely stainless steel, and this is an oxide colouring caused by high temperatures. It can be seen around stainless steel welds. It can be cleaned by a mixture of nitric and hydrofluoric acids, but this is absolutely definitely not something you should do unless you have extensive training. One drop of hydrofluoric acid on your skin can cause (reportedly) the most painful burns imaginable. It is truly China Syndrome stuff, with it eating through your flesh until it reaches bone. I'd use an abrasive, perhaps some cutting compound (Kitten #2), then finish by polishing with a milder abrasive such as Brasso.

[RaihaX]

Originally Posted by Blauweisser

The tip is likely stainless steel, and this is an oxide colouring caused by high temperatures. It can be seen around stainless steel welds. It can be cleaned by a mixture of nitric and hydrofluoric acids, but this is absolutely definitely not something you should do unless you have extensive training. One drop of hydrofluoric acid on your skin can cause (reportedly) the most painful burns imaginable. It is truly China Syndrome stuff, with it eating through your flesh until it reaches bone. I'd use an abrasive, perhaps some cutting compound (Kitten #2), then finish by polishing with a milder abrasive such as Brasso.

Got this link from a member

http://www.turnermotorsport.com/p-52...ible-2008.aspx

on the description it says "chrome-plated tail pipes" not sure if that is correct.

That sounds freaking scary - no way in hell I want to handle Hydrofluoric acid....

I realize is definitely from high temp gas from the left tip as the left tip is shorter then the right one (staggered setup).

[MrBlonde]

Originally Posted by Tit

Highly abrasive polish - think army people polishing belt buckles and Jeeves polishing your homewares...

Or think of Wiggins getting a dickyback ride.

[RaihaX]

Originally Posted by MrBlonde

Or think of Wiggins getting a dickyback ride.

still nostalgic I see

[MrBlonde]

Originally Posted by RaihaX

still nostalgic I see

Ha! Anyway for a serious answer to your tip mark
http://www.sti.health.gov.au/interne...publishing.nsf

[Honny]

How about powder-coating them matt black?

[RaihaX]

Originally Posted by MrBlonde

Ha! Anyway for a serious answer to your tip mark
http://www.sti.health.gov.au/interne...publishing.nsf

Originally Posted by Honny

How about powder-coating them matt black?

Originally Posted by ianf

there's a DIY to fit the stock 135 black tips onto the PE

I actually quite like the chrome/SS tip TBH.

Can't fit my stock 135i black tips as I have sold the stock exhaust now

[Taymaishu]

Originally Posted by RaihaX

I actually quite like the chrome/SS tip TBH.

Can't fit my stock 135i black tips as I have sold the stock exhaust now

Hey mate,

If you are considering polishing the mark for removal, I'll offer my 2c worth as a detailer.

On any repair, always move from least aggressive through the spectrum to most aggressive.

If you have a compound polish, I'd be using that second after a clay. You'd be surprised at what clay can remove. 3rd I'd look at Meguiar's Pro line and the medium cut polish. It's in a beige bottle.

Make sure you're using a foam polishing pad for any polish you put there is it won't have any cutting action without it.

Cheers,

Alex

[RaihaX]

Originally Posted by Taymaishu

Hey mate,

If you are considering polishing the mark for removal, I'll offer my 2c worth as a detailer.

On any repair, always move from least aggressive through the spectrum to most aggressive.

If you have a compound polish, I'd be using that second after a clay. You'd be surprised at what clay can remove. 3rd I'd look at Meguiar's Pro line and the medium cut polish. It's in a beige bottle.

Make sure you're using a foam polishing pad for any polish you put there is it won't have any cutting action without it.

Cheers,

Alex

Thanks for the tip Alex will definitely go from least aggressive to the most. Wouldn't want to damage it instead!

[Tit]

Originally Posted by MrBlonde

Ha! Anyway for a serious answer to your tip mark
http://www.sti.health.gov.au/interne...publishing.nsf

[RaihaX]

Followed Raj's recommendation of detergent and bi-card soda with warm water.

Came out beautiful!

before and after pic.

Thanks mate!

ps. just realise there are slight marks still - need to clean it a bit more later

[JB4-335]

Looks spanking new Ray.

[RaihaX]

Originally Posted by JB4135

Looks spanking new Ray.

I hope that wasn't a pun about my tip and spanking....

but thanks - was irritating me and my OCD