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Very interesting and good info guys, thanks!
So, it really looks like the biggest difficulty is going to be getting the air warmed up enough, especially at the flow rates we are thinking about. The efficiency of the exhaust heat to air exchanger is going to be the thing that makes or breaks this. Perhaps it will have to extend down the exhaust pipe a ways. It sounds like we're sorely lacking in surface area.
Anyway, moving forward, I pulled the EGT gauge out of my Tercel this weekend. The next step will be making a mount to put it on the Metro manifold with some insulation around it. I'd like to see how fast the manifold gets up to temperature versus the coolant. Even if the air idea doesn't work out, this will be useful for coming up with other ideas, and knowing how soon we get usable heat.
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