Re: Reducing engine temperature with exhaust wrap
I think, if the same engine is running under identical conditions, it is going to produce the same amount of heat in terms of BTUs if you want to use a measurement. That heat has to go somewhere.
Before wrapping, I suggest that a portion of the BTUs was being radiated off the exhaust inside the hood area per your observations of melting wires and such.
After wrapping, I'd think the same BTUs, not being able to radiate as much from the exhaust, are now being pushed out in the exhaust gas stream. Likely you should see hotter exhaust gas exit temps as a result.
Regardless, wrapping certainly helps keep the engine cooler by pushing most of the generated heat out the exhaust stream. The only down side might be that the exhaust system likely runs hotter, so watch the place where it exits the head for any heat related issues. A well adjusted engine, valves, fuel, etc., shouldn't suffer from a wrapped exhaust system.
Just my humble opinion.
X 500 48" Deck 48" blade
Stihl BR 600
Sears Suburban Super 12 1968
Craftsman 1990 something LG Tractor 46" deck
Original Kohler 8hp Giant Vac early 1960s