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Bluing exhaust pipes #442246 06/28/12 2:30 am
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PsYcHoBiLLYRocKeR Offline OP
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Hello all, I'm sure this might have been gone over several times before, but for the life of me I cannot find anything using the search option....ok that being said, could you guys help me figure out what are the possible causes of bluing on only one exhause pipe on a 67 thunderbolt, as i'm sure you all know its a single carb. 650, thanks guys

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Re: Bluing exhaust pipes [Re: PsYcHoBiLLYRocKeR] #442247 06/28/12 2:34 am
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Pete R - R.I.P. Offline
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Thin metal on the pipe,late ignition timing,leaner mixture on one cylinder(harder to fix wih only one carb).

Re: Bluing exhaust pipes [Re: PsYcHoBiLLYRocKeR] #442255 06/28/12 3:40 am
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VT Jeff Offline
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How do the spark plugs look? Is one white (lean) on the side with the blue pipe? If one ceramic insulator is white and the other tan or brown, you may have an air leak somewhere. Are the pipes modern replacements? Some of them are thin and, even if bought in a pair, can vary a small amount in wall thickness. If there is no air leak, an old trick (chewing gum and bailing wire, last resort variety) is to coat the interior of the blueing pipe with heat proof paint.


Jeff Connor
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1972 Norton Commando Roadster
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Re: Bluing exhaust pipes [Re: VT Jeff] #442259 06/28/12 6:47 am
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beezageezauk Offline
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Try doing a compression test. A slightly leaking exhaust valve will cause overheating on one side and blue a pipe.

Beezageezauk.


Re: Bluing exhaust pipes [Re: PsYcHoBiLLYRocKeR] #442508 06/29/12 11:12 pm
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PsYcHoBiLLYRocKeR Offline OP
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Thanks guys, I think I narrowed it down to a timing issue, I really appreciate the help

Re: Bluing exhaust pipes [Re: PsYcHoBiLLYRocKeR] #442509 06/29/12 11:21 pm
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conhawks Offline
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blueing and tarnishing.many years ago this said to be because of single nickle plating. double nickle plating and then chroming was the cure. has anything changed?

Re: Bluing exhaust pipes [Re: beezageezauk] #442550 06/30/12 11:46 am
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Pete R - R.I.P. Offline
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Originally Posted by beezageezauk
A slightly leaking exhaust valve will cause overheating on one side and blue a pipe.

Quickest way to fix a slightly leaking exhaust valve is to give the engine a few rev-ups,with no exhaust pipes attached to the head.30 seconds of this treatment will normally show an improvement on the compression gauge.

Make a lot of noise,but you don't need excessive revs.Check valve clearances after the engine cools down.

Re: Bluing exhaust pipes [Re: PsYcHoBiLLYRocKeR] #442624 07/01/12 12:21 am
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Tridentman Offline
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Hi Pete--I have seen you give this advice several times on this forum.
I am intrigued---how did you find out this was a good thing to do?
Hope you dont mind me asking.

Re: Bluing exhaust pipes [Re: Tridentman] #442642 07/01/12 3:50 am
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Pete R - R.I.P. Offline
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Some things are invented,and some things are just discovered.I discovered this a little over 40 years ago,working on a bike that had been run with tight valve clearances.I had the pipe off to look at the exhaust valve.A few blasts without the exhaust pipe improved the compression.

I tried it later on a bike that had been stored about a year,and it was down about 30 psi on one cylinder.It all came back within a minute.

It seems to work,so I've done it on other bikes and got similar results when normal running wouldn't fix it.

Re: Bluing exhaust pipes [Re: PsYcHoBiLLYRocKeR] #442711 07/01/12 4:19 pm
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Tridentman Offline
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Pete--thanks. Very interesting.

Re: Bluing exhaust pipes [Re: Tridentman] #442745 07/01/12 7:14 pm
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beezageezauk Offline
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Yes Pete...thanks from me also. I've had that problem a couple of times and taken the long route of a decoke and valve grind. I guess I'll be "annoying the neighbours" next time.

Beezageezauk.

Re: Bluing exhaust pipes [Re: PsYcHoBiLLYRocKeR] #443239 07/05/12 3:32 am
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PsYcHoBiLLYRocKeR Offline OP
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I've gone ahead and ordered a Pazon Ignition, if your interested in the results, i'll keep you posted

Re: Bluing exhaust pipes [Re: Pete R - R.I.P.] #443292 07/05/12 3:39 pm
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roadrocket Offline
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pete r can you tell me how running without pipes restores the compression i am at a loss to see how it works.


love life
Re: Bluing exhaust pipes [Re: roadrocket] #443350 07/05/12 9:12 pm
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Pete R - R.I.P. Offline
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I only discovered that it works,and often enough gets a 30 psi improvement.
I haven't discovered exactly why it works.

I can only assume that it's like de-scaling a copper head gasket,when you quench it.The crud/scale doesn't like hot exhaust followed by cold air,and it gets cleaned off.


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