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Is this for the prius? I insulated mine a year ago including a belly pan. It works quite well if you seal the hood properly with weather stripping. The best deal is the super thick pickup truck bed cover seal. For the bulk of the job I was very lucky and found a few sheets of 1inch engine bay sound insulation with the reflective foil on it. It just sits on top of the engine and can be removed easily for maintenance.
As for quick engine heating one possibility is running the exhaust pipe throughout the engine compartment. Not an easy task but with some bypass valves it would be simpler than heat exchangers.
One thought I had, when not near an outlet ,was powering the tank heater from the battery but I'm not sure the math works. Also, where do you get a 300 - 110 volt converter?
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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