Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Simple and cheap DIY exhaust heat to coolant heater idea

Isaac Zackary · 06-26-2015, 10:10 PM

Not just air flow, you need convection. The VW Beetles can put out only a little over 200F air in the cabin vents. And that's with heavily finned aluminum OEM heat exchangers (fins on both the inside and outside of the exhaust manifolds!) with not a lot of air flow. Maybe if you had finned exhaust from the tail pipe clear onto the exhaust manifold, but that still probably wouldn't get you enough heat.

06-26-2015, 10:10 PM	#24 (permalink)
Isaac Zackary Full sized hybrid. Join Date: Apr 2015 Location: Colorado Posts: 602 Suzy - '13 Toyota Avalon Hybrid XLE 90 day: 37.18 mpg (US) Thanks: 369 Thanked 108 Times in 84 Posts	Not just air flow, you need convection. The VW Beetles can put out only a little over 200F air in the cabin vents. And that's with heavily finned aluminum OEM heat exchangers (fins on both the inside and outside of the exhaust manifolds!) with not a lot of air flow. Maybe if you had finned exhaust from the tail pipe clear onto the exhaust manifold, but that still probably wouldn't get you enough heat.