Thread: The dirty cost of one man's hypermiling?
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Old 07-27-2012, 05:10 PM   #164 (permalink)
California98Civic
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Join Date: Mar 2011
Location: Coastal Southern California
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Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
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Quote:
Originally Posted by christofoo View Post

References:
1. 25 minutes cool-off time: see Fig 2 and Table 2 on p3:
http://www.nrel.gov/vehiclesandfuels..._emissions.pdf
Really interesting. Thanks. This essay on how "sufficient insulation around the converter can help the converter maintain its temperature above light off for several hours after the engine is shut off." (p.2) But of further significance to this thread is the description of current CATs as having a light off temperature of 350*C (662*F) that is typically retained for 25 minutes after the engine is shut off. That would imply that a fully grill blocked CAT, close to the exhaust manifold, allowed to warm up properly, would tend to stay lit during EOC.

james
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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