loquin
Well-Known Member
The TL series are 'conventional' two-strokes, and are probably what was used as the control group for the comparison. (It would be logical - start with the TL, modify it to become the TLE, compare results.) Whether that is actually what happened, we won't know.
Anyway. Mitsubishi has posted some additional info. It's referenced here. On this post there are two links. The one that was in the quoted section points to the original Mitsubishi cut-sheet for their small engine line. It's a pretty big document, though, which takes a while to load. I've chopped out much of the extraneous, non-TLE info & created a new PDF that you can take a look at (the second link.) The last page of the PDF file has environmental specs & shows where the TLE line, as well as a couple of their conventional two-strokes, fall. The conventional two strokes just met the older CARB Tier 1 compliance, but do not for Tier 2 or Tier 3. TLE series engines do meet Tier 3, which is about 25% of the allowable emissions of tier 1.
Per that diagram, a few of Mitsubishi's conventional 2-strokes produced about 4 times the emissions as the TLE line, and barely made the old, Tier1 compliance. If you download the entire document, several TL series engines are still marketed, but, none of them (apparently) met the old emissions compliance requirements.
Note that the diagram seems to show that the TLE43 has the same emissions as the TLE23. That is incorrect. The numbers are emissions in grams per KW (1.34 HP) per hour. Since the TLD43 produces about twice the horsepower, when you divide the total emissions mass in grams by the power produced for an hour, the results are roughly equal.
Anyway. Mitsubishi has posted some additional info. It's referenced here. On this post there are two links. The one that was in the quoted section points to the original Mitsubishi cut-sheet for their small engine line. It's a pretty big document, though, which takes a while to load. I've chopped out much of the extraneous, non-TLE info & created a new PDF that you can take a look at (the second link.) The last page of the PDF file has environmental specs & shows where the TLE line, as well as a couple of their conventional two-strokes, fall. The conventional two strokes just met the older CARB Tier 1 compliance, but do not for Tier 2 or Tier 3. TLE series engines do meet Tier 3, which is about 25% of the allowable emissions of tier 1.
Per that diagram, a few of Mitsubishi's conventional 2-strokes produced about 4 times the emissions as the TLE line, and barely made the old, Tier1 compliance. If you download the entire document, several TL series engines are still marketed, but, none of them (apparently) met the old emissions compliance requirements.
Note that the diagram seems to show that the TLE43 has the same emissions as the TLE23. That is incorrect. The numbers are emissions in grams per KW (1.34 HP) per hour. Since the TLD43 produces about twice the horsepower, when you divide the total emissions mass in grams by the power produced for an hour, the results are roughly equal.
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