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Old 01-31-2014, 08:00 AM   #191 (permalink)
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Quote:
Originally Posted by American Viking View Post
I disagree with your statements that pre-obdII cars more polluting..
If you go from Euro 1 (1992) to Euro 5 or 6, the pollutants produced per volume of fuel burned, drop by about a factor 6 . Some more, some less.

Of course, that's when combustion takes place under test conditions, while real life conditions differ, but that was the case all along.

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Old 03-25-2014, 06:17 PM   #192 (permalink)
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No I didn't read 20 pages, but would like to add that Hypermiling endeavors to keep the rpm low or coast with the engine off. This massively reduces throughput of air. A 4-cycle ICE ingests its nominal discplacement every 2 revolutions at cruising speed. If you take your rpms at 2500 rpm cruising, your ICE ingests its displacement 1,250 times per minute.

My '00 Corolla uses about 16,000 gallons of air for every 1 gallon of fuel. 30 miles round trip to work, 30 mins of driving round trip, average rpm 2200. My truck uses 36,000 gallons of air for the same trip (1,500 rpm avg).

I breathe about 100 gallons of air for the same trip, 30 mins.

Thank you to everyone who does engine off coasting and engine off at lights!

Darrell (OP), you should congratulate yourself for not heating the atmosphere as much as the average person
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Old 03-25-2014, 06:33 PM   #193 (permalink)
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An engine inhaling its displacement would have to do so with no throttle restriction. In most cases with manifold vacuum at half of atmospheric pressure the air flow would drop 50%.

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Old 03-25-2014, 06:50 PM   #194 (permalink)
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I considered that of course, I have not checked vacuum at cruising speed in my corolla. I will have to check that out. However, my truck is turbo diesel and has no air throttle body, therefore effectively no restriction. Plus it is turbo'd which multiplies its displacement at cruising.

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