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- Newsgroups: rec.autos
- Path: sparky!uunet!spsgate!mogate!newsgate!wdc!mark
- From: mark@wdcwdc.sps.mot.com (Mark Shaw)
- Subject: Re: Ethanol blended gasoline
- Message-ID: <1992Nov6.002628.4960@newsgate.sps.mot.com>
- Sender: mark@wdc (Mark Shaw)
- Nntp-Posting-Host: 223.199.55.11
- Organization: Motorola Western MCU Design Center, Chandler Arizona
- References: <etc.> <bob1.720901984@cos> <1992Nov4.195708.29977@erg.sri.com>
- Distribution: usa
- Date: Fri, 6 Nov 1992 00:26:28 GMT
- Lines: 31
-
- In article <1992Nov4.195708.29977@erg.sri.com>, rat@erg.sri.com (Ray Trent) writes:
- |> In the referenced article, bob1@cos.com (Bob Blackshaw) writes:
- |> >it not cutting pollution. It seems to me that the oxygen sensor sees
- |> >a higher oxygen content and so calls for a richer mixture, hence the
- |> >loss in mileage. Whether the final result is less CO I will soon know
- |>
- |> Although this whole thing sounds like a scam to me too, remember that
- |> the majority of pollution comes from vehicles that are old enough that
- |> they probably don't *have* oxygen sensors.
- |>
- |> Whether or not an oxygen sensor would detect the "oxygenated" fuel in
- |> question is another matter.
- |>
- |> Also note that if, as the Subject implies, we are talking about
- |> Ethanol blended gasoline, the decreased efficiency may simply be due
- |> to the lower energy content of ethanol vs. gasoline (primary hexane if
- |> I remember correctly). The "emissions" may or may not go up, depending
- |> on what you consider "emissions".
-
- Most oxygenated fuel campaigns are aimed at the older cars (usually pre-1982)
- which do not have closed-loop fuel control. The local emissions regulation
- office has essentially admitted that it has little effect on the emissions
- from the newer cars, but it can reduce CO from an older uncontrolled car by
- as much as 20%.
-
- The problem with the alcohol blend is that it also increases the formaldehyde
- emissions, which currently have no offical limits (despite being known
- carcinegens). They are also more likely to cause problems for older cars
- with carbureators and dirty fuel systems.
-
- Mark
-