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Old 10-19-2012, 01:10 PM   #13 (permalink)
Piwoslaw
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Join Date: Oct 2008
Location: Warsaw, Poland
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Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
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That is a good idea and it's been done: The II gen Toyota Prius has a 3 liter thermos which stores engine coolant, keeping it warm for quite a few hours. A DIY version isn't easy, but is possible. Check out these threads:
Heat storage system (Prius-like insulated coolant reservoir)
Keeping Engine Coolant Hot
Mimicking Gen3 Prius Exhaust Heat Recovery
The last thread is about a different approach to quicken warmup times, used in the III gen Prius.
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e·co·mod·ding: the art of turning vehicles into what they should be

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[Old] Piwoslaw's Peugeot 307sw modding thread
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