What do you use to keep your chrome exhaust shiny?
- David.
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Re: What do you use to keep your chrome exhaust shiny?
Thank you for your reply Chris, at the same time, I asked a fellow motorcyclist who is also a metallurgist the same question, this was his take on it.
"The oxide scale (the discoloured layer) that is formed on your exhaust manifold is Chromium oxide, mainly - Cr2O3 with its thickness growing gradually with temperature cycles until spallation."
It's chemistry and not a lot you can do about it. Modern motorcycle engines are set to run lean to meet emission regulations. Lean = hot, I've had my 2012 Camhead re-mapped by Hilltop Motorcycles. The air/fuel ratio is now likely to be richer & slightly cooler running. Certainly not sufficient to prevent discolouring but I do think that it's progress is reduced slightly. When I fire the bike up, I'll keep an eye on how the discolouration develops. Long term, I do think that ceramic coating with Cermakrome is the answer for me.
As you say, double wall pipes is the way to go, my 1980 Yamaha XJ650 (like the one pictured) has 30 year old header pipes on it.
"The oxide scale (the discoloured layer) that is formed on your exhaust manifold is Chromium oxide, mainly - Cr2O3 with its thickness growing gradually with temperature cycles until spallation."
It's chemistry and not a lot you can do about it. Modern motorcycle engines are set to run lean to meet emission regulations. Lean = hot, I've had my 2012 Camhead re-mapped by Hilltop Motorcycles. The air/fuel ratio is now likely to be richer & slightly cooler running. Certainly not sufficient to prevent discolouring but I do think that it's progress is reduced slightly. When I fire the bike up, I'll keep an eye on how the discolouration develops. Long term, I do think that ceramic coating with Cermakrome is the answer for me.
As you say, double wall pipes is the way to go, my 1980 Yamaha XJ650 (like the one pictured) has 30 year old header pipes on it.
Last edited by David. on Fri Mar 20, 2020 6:50 pm, edited 1 time in total.
- David.
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Re: What do you use to keep your chrome exhaust shiny?
Having started the bike up today, even only at idle, the header pipes were seen to discolour in front of my eyes.David. wrote:When I fire the bike up, I'll keep an eye on how the discolouration develops. Long term, I do think that ceramic coating with Cermakrome is the answer for me.
Think I'll be looking at Cermakrome again this winter.
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Re: What do you use to keep your chrome exhaust shiny?
This guy is using Autosol Bluing Remover on a GS, https://www.youtube.com/watch?v=lJBlMFUQmFE
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Re: What do you use to keep your chrome exhaust shiny?
Even better results using Blue Away and #0000 Steel Wool.
Re: What do you use to keep your chrome exhaust shiny?
Wow, that's really nice. I'll look for some of that stuff., thanks.
2023 R1205RT LE Sport Blue. Retired motorcycle cop now IT consultant and RoSPA RoADAR examiner.
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Re: What do you use to keep your chrome exhaust shiny?
The above photo was taken from this thread found posted on the BMWLT forum, https://www.bmwlt.com/forums/rt-series/ ... ueing.html
Last edited by David. on Mon Apr 06, 2020 3:37 pm, edited 1 time in total.
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Re: What do you use to keep your chrome exhaust shiny?
I would not use Steel Wool on Chrome as it is far to abrasive and we used to make Steel Wool quality Rod. Better with the creams-Autosol etc.
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Re: What do you use to keep your chrome exhaust shiny?
scunny12 wrote: I would not use Steel Wool on Chrome as it is far to abrasive and we used to make Steel Wool quality Rod. Better with the creams-Autosol etc.
I agree, far too abrasive. Camcoat recommended using 0000 grade steel wool to clean any stubborn marks off my Ceramic Coated headers without damaging them? I find using a Magic Eraser Sponge works perfectly well and brings them up a treat. A Magic Eraser with Autosol might be a good option to try on chrome?.
Ps. Try not to run your bike stationary. It'll accelerate blueing without the forward motion air cooling.
(I'm sure someone will be along to prove me wrong very shortly)
The GS 'is' the better bike :-)
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Re: What do you use to keep your chrome exhaust shiny?
Beagle wrote: How much does the coating cost?
It cost me £220 (I paid cash) + Vat for them to be coated all the way to the exhaust noise valve. They measure the area before giving a cost? It'd have been roughly £110 + the dreaded if I'd had them just done to weld after the O2 sensors.
I'll try and find a picture. Lc
The GS 'is' the better bike :-)
Re: What do you use to keep your chrome exhaust shiny?
Keep it in a box in the attic after installing an Akrapovic. ;D
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Re: What do you use to keep your chrome exhaust shiny?
Do Akrapovic offer exhaust headers for a Wethead or is it just a silencer.
Last edited by David. on Tue Apr 07, 2020 7:15 pm, edited 1 time in total.
- David.
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Re: What do you use to keep your chrome exhaust shiny?
Just a thought, has anyone changed their chrome headers for stainless steel.
From experience with a 2007 Hexhead, yes, they still do discolour, more brown than blue but can be aggressively polished back to shiny.
From experience with a 2007 Hexhead, yes, they still do discolour, more brown than blue but can be aggressively polished back to shiny.