Cat heat creates bubbles on heat shield
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Elite HDF Member
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From: Near Myrtle Beach, SC
Cat heat creates bubbles on heat shield
I snapped this picture a today as I was repositioning my heat shields. It's a shot of the inside surface of the stock exhaust heat shield section that use to cover the cat area of the stock header pipe. I noticed it a couple of years ago when I removed the stock header and went with the FM 2-1-2 stainless header. So I thought it might be interesting and took a shot of it while I had it off today.
What may look like water droplets in the photo below is actually the finish on the inside of the heat shield bubbling-up, most likely due to the heat exposure from the cat. The inside of the heat shield appears to have some kind of low quality chromium finish, but it is definitely not the same quality finish as on the outside. Anyway, this is just another physical indication of how darn hot it gets in the general vicinity of the cat. There is a blued area which seems to also indicate a concentration of heat.
No wonder the rear brake switch housing was compromised by this extreme heat on so many bikes to the point of a national recall.
What may look like water droplets in the photo below is actually the finish on the inside of the heat shield bubbling-up, most likely due to the heat exposure from the cat. The inside of the heat shield appears to have some kind of low quality chromium finish, but it is definitely not the same quality finish as on the outside. Anyway, this is just another physical indication of how darn hot it gets in the general vicinity of the cat. There is a blued area which seems to also indicate a concentration of heat.
No wonder the rear brake switch housing was compromised by this extreme heat on so many bikes to the point of a national recall.
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From: Bloomfield, NM
The heat will also melt the sheathing on the wiring that runs along the frame behind the cat, but there are those here that will tell you there is no significent heat increase in the area of the cat.
Bill
Bill
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Elite HDF Member
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From: Near Myrtle Beach, SC
Agree. I've read some of those posts. They remind me of that story, The Emperors New Clothes.
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Elite HDF Member
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From: Near Myrtle Beach, SC
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