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post #1 of 5 (permalink) Old 07-31-2011, 01:50 PM Thread Starter
 
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red hot exhaust

hello all. the heat finally let up somewhat this weekend and yesterday i was able to spend all day riding, into the evening. while taking a break after a good, hard run i noticed my header/midpipe were hot. not just a little hot, but glowing red hot. i do have the whole length of pipe from head flange to muffler gasket header wrapped pretty well so i'm wondering if the wrap is just a good enough job it's retaining all the heat in the exhaust to the point the pipes are glowing. i happened to have my wideband o2 datalogger on all day long, and i never ran lean which is the only thing i can really think of that would cause this issue. has anyone else ever noticed anything similar with any of their machines or do i have another issue of some sort? thanks in advance for your input.
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post #2 of 5 (permalink) Old 07-31-2011, 04:44 PM
 
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Re: red hot exhaust

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Originally Posted by homey_15 View Post
hello all. the heat finally let up somewhat this weekend and yesterday i was able to spend all day riding, into the evening. while taking a break after a good, hard run i noticed my header/midpipe were hot. not just a little hot, but glowing red hot. i do have the whole length of pipe from head flange to muffler gasket header wrapped pretty well so i'm wondering if the wrap is just a good enough job it's retaining all the heat in the exhaust to the point the pipes are glowing. i happened to have my wideband o2 datalogger on all day long, and i never ran lean which is the only thing i can really think of that would cause this issue. has anyone else ever noticed anything similar with any of their machines or do i have another issue of some sort? thanks in advance for your input.
That seems to be normal. Also its why the mid pipe seems to crack after awhile.
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post #3 of 5 (permalink) Old 07-31-2011, 09:07 PM
 
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Re: red hot exhaust

Header wrap will definately do this....hold the heat in. I've never had ANY good luck with header wrap. It always (two times I tried using it on a 4x4, once with a small block Chevy motor with headers and another time on an AMC 360 with headers) resulted in cracks in in the weld joint at the header to exhaust flange or resulted in the exhaust sagging due to the heat in the tubes. I would remove it unless you REALLY need it in order to keep from melting other stuff nearby. The benefits of increased power (which is what some say it will do) far outweigh the negatives it can do (imho).

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post #4 of 5 (permalink) Old 08-11-2011, 10:16 AM Thread Starter
 
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Re: red hot exhaust

the header wrap is actually part of my war on heat soak into the gearbox. check it sometime after a good hard run, you won't be able to rest your hand on it. as we all know, heat is the enemy of anything mechanical-the more you can scrub off/get rid of the better. after noticing how extreremly hot it would get and knowing about the inherent gearbox problems redlines have i decided it'd be worth my while to keep as much of that heat out of the box as i could. i wrapped the hell outta the whole exhaust and built a heat shield with some fancy heat reflective coating, i now see gearbox temps of about 170 degrees on a 100 degree day, i'd love to hear feedback from anyone who owns a infared heat gun and a stock revolt as to what temps in the gearbox are after a good, long, hard run so i kinda know what i've gained. i do know i can now place my hand on the box and hold it there where before i'd be doing good to touch it momentarily but that's nothing like having a real number. thanks again for your input.

Last edited by homey_15; 08-11-2011 at 10:32 AM.
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post #5 of 5 (permalink) Old 08-13-2011, 09:34 PM
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Re: red hot exhaust

The header pipe is not designed right. I had a company run the specs on the redline and they determined that the mid pipe should have a minimum of 12 inches before the merge happens for proper scavenging. They inherently hold heat. After I bored the stock Redline out to 800cc I couldn't keep donuts in the mid to header flange and I wasted 3 different big gun exhausts.
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