Head pipe discoloration

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Head pipe discoloration

Postby jOe » Thu Feb 04, 2021 8:02 pm

I have a set of pipes on a ‘63 XLCH that keep discoloring. Timing, carb , valves ✔️. Within a minute of startup they start turning color . Seems to start at around 165-175F. Both pipes. These were freshly re- chromed when I got them. The yellow polishes off fairly easily. I’m wondering if this is a case of a suboptimal rechrome
jOe
 
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Re: Head pipe discoloration

Postby Redpan » Fri Feb 05, 2021 9:35 am

I've experienced the same result with rechrome.
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Re: Head pipe discoloration

Postby JohnF » Fri Feb 05, 2021 10:04 am

Might try the ceramic internal exhaust pipe coating from Eastman or others. Supposed to help discoloration and provide insulation. Going to use it on a reproduction set of pipes that have not been used, yet, on a restoration project on my 54 KH.
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Re: Head pipe discoloration

Postby jOe » Fri Feb 05, 2021 11:39 am

I sprayed silica- ceramic high temp paint inside them. No real noticeable results. I’m thinking bad chrome. There’s no way the pipes should turn color at 175F +/-
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