I am thinking of stealing some of the heat from that pipe to heat WVO in my trunk. I am thinking of I wrapping my exhaust pipe just in front of the muffler with some copper tubing and then run it up into my trunk. Then build a loop that surrounds my WVO tank. Fill the loop with fluid, likely pure antifreeze, and allow the heat differential in the fluid to move it around.

My question is, how hot does that pipe normally get? I certainly don't want to boil my WVO in my tank. Especially since I'm just using the plastic cubies that the oil comes in new.

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.

My exhaust at my bumper is hot enough to burn your hand if I push up the idle to 1,500 rpm.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

I'd guess that at highway speeds, the exhaust temp is in excess of 450°F.

However, unless you seal that coolant loop, the coolant temperature will never exceed the boiling point of the liquid in the loop. If it is sealed/pressurized (and I don't recommend doing that) the boiling boint of the coolant will rise 3° F for every 1 psi increase in system pressure. Obviously, there will be some additional heating because of conduction from the metal in the exhaust to the tubing on the heat exchanger too.

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Never a dull moment at Berry Hill Farm.

Using exhaust heat as part of a WVO system always sounds like much better of an idea than I believe it would be in practice. The biggest problem I have with it is the inconsistency. The temperature extremes seem to me to be just too large to make it practical. Coolant heat, on the other hand, is regulated by the thermostat so at least you know what you are getting.

But, as I have said before, much of the WVO world of today is built on the wild-eyed experimentation of others in the past so if you feel you can make it feasible, try it out. Just don't have a steam explosion or burn the car down in the process...

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Keep everything as simple as possible-but no simpler--Albert Einstein