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Heat Wrap for LPMM(GS1)

 
Old 09-12-2007, 08:19 PM
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Garth S
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Default Heat Wrap for LPMM(GS1)

After doing the combined LPMM and 180 deg rotation of the muffler outlet pipes ( which is the 'GS1' portion to accomodate NB wide ovals on a WB car ), the rear fender area appeared to run noticibly warmer than previously. I was not overly satisfied with the heat shields, so replaced them with fiberglass header wrap as an experiment: should have shot some before/after temps ... but did not; however, there appears to be a noticible temperature drop after wrapping the piping.
I will run with this for a while ... but think that the heat shields may end up in the recycle bin: one could reinstall them over the wrap if desired.
Ten feet of 2" wrap would do each muffler nicely .... I only had a scant 8.5 ft to spare each side from the reminants of a coil kicking around .... but I did say that it was an experiment ... Stainless tiewraps are the way to go to secure the wrap - but being fresh out, stainless 2" hose clamps do just fine.
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Old 09-12-2007, 09:26 PM
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993inNC
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Although not a bad idea in theory, similar to wrapping headers, you will accelerate rust wherever the wrap is. The inlet and outlet pipes are not stainless. Just a thought
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Old 09-12-2007, 10:34 PM
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chris walrod
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Anything wrapped with this stuff needs to be inspected from time to time as the wrapping does hold-in a lot of heat. Every header I have wrapped cracked after a year of use. Then again, header primary pipe do run a lot hotter than that of exhaust downstream.
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Old 09-13-2007, 06:47 AM
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A valid point to check the piping condition at some point ; however, anything downstream of the CAT does run substantially cooler than the headers. Regarding the risk of corrosion, I had assumed the muffler piping to be of SS409, a ferritic stainless. The body shell is also ferritic ('magnetic'), wheras the end caps appear to be a SS304 austentic alloy. Perhaps not ...??

The idea was that with the bypass redirecting some significant portion of the gas flow directly to the muffler exit pipe, wrapping would have more of the heat blasting out the tip rather than radiating up inside the fender well ..... plus one cannot ignore the potential enhanced acceleration from the jet effect ...
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Old 09-13-2007, 01:47 PM
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Amfab
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I hope the jet effect offsets all that extra weight from the heat wrap
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Old 09-13-2007, 04:09 PM
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Originally Posted by Amfab View Post
I hope the jet effect offsets all that extra weight from the heat wrap
and aero drag
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