...... with the laser thermo along checked all over no change.....
Yeah, but what temps did you check, where did you check them, & how did you check them?? :sour:
Exhaust pipes take a very short time to radiate &/or shed heat into the surrounding atmosphere & components, so checking temps even just a few minutes after stopping probably isn't going to show too much variation pre & post wrapping; but checking the difference in external pipe temps while the engine is still running or
immediately after stopping will - unless you haven't wrapped the pipes properly or they aren't wrapped in heat shielding material! :shocked:
However, the Cat Converter is effectively a choke point designed to create & trap exhaust gas heat in the catalytic honeycomb so that any unburnt fuel will react with the catalyst & not be allowed past, so if you still have a catalytic converter fitted, that's where most of the heat from the exhaust gases will be trapped & not too much of that should get passed along into the pipes or gases afterwards; but if you have a cat eliminator & your pipes are wrapped properly from the cyl heads right thru to the end of the cat eliminator, then most of the exhaust gas heat should make it to the final exhaust outlet, where pre & post wrapping gas temps should be noticeably different.... with the same 'unless' proviso's as above!
Similarly for the radiant heat coming from the pipes themselves between the heads & the cat converter; wrapped properly there, the radiant heat they put out is going to be significantly reduced....(& therefore the heat transferred into the surrounding components, tupperware, & your feet etc) - if that heat is not reduced, then either you've done a really poor wrapping job, or you've wrapped the pipes in something that's NOT intended for heat reduction... :dontknow:
Or could it be that the Laws of Physics have changed?? :dontknow: