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Pastimes : Don't Ask Rambi -- Ignore unavailable to you. Want to Upgrade?

To: nasdaqian who wrote (58269)	1/18/2001 12:37:45 PM
From: Jacques Chitte	Read Replies (2) \| Respond to of 71178

The way I read it ... the engine runs as hot as any, but since my gallons-per-hour are very low and since the exhaust system is the size of that on any Honda ... not enough hot exhaust mass flow was generated to heat up the entire exhaust. Put another way, air-cooling the exhaust tract at 25-30mph was efficient enough to dissipate all the combustion heat before it reached the tailpipe. These are rationalizations mind you. I simply observed to my astonishment that after short trips and long, my muffler wasn't hot and my exhaust tip wasn't even warm. The car that gets 20mpg is burning twice as much fuel as the one hetting 40 mpg. Independent of questions about conversion efficiency ... every 20 miles, 1 gallon's worth of combustion heat is produced. That equates to a higher thermal flow out the pipe. If the pipe is the same size, one arrives at a point where the heat flux from combustion drops below the cooling capacity of all that metal pipe work. i was getting an avg of 50 mpg, so it appears that I came in below that balance point. I'd be very curious to know how the even more efficient Honda Insight treats its exhaust tract.