Looks like there's another 40%+ thermally efficient gasoline engine

"bhtooefr" (bhtooefr) 02/26/2018 at 09:48 • Filed to: Toyota, Engines, Efficiency

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So Toyota dumped info on !!!error: Indecipherable SUB-paragraph formatting!!! , and it looks like they got to 40% thermal efficiency again.

This one’s a 2.0, and it’s basically the same idea as the 2.5 in the new Camry, just smaller. So, direct plus port injection, very long stroke, laser-cladded valve seats, all that fun stuff.

The non-hybrid version is 40% efficient, and 169 hp @ 6600 RPM, 151 lb-ft @ 4800 RPM. The hybrid version is 41% efficient, and 143 hp @ 6000 RPM, 133 lb-ft @ 4400 RPM.

It looks like all of this is !!!error: Indecipherable SUB-paragraph formatting!!!  - including a new CVT with a launch gear (to bypass the CVT for higher efficiency in stop-and-go traffic, apparently), a new lighter-weight manual transmission with software rev matching (interestingly, they claim it rev matches upshifts, too, implying that rev hang isn’t an issue), and a hybrid system. Some specs indicate that we’ll be getting some of this in the Corolla, too, and there’s also discussion of AWD systems likely intended for crossovers.

Wacko > bhtooefr 02/26/2018 at 09:59

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so this is the Toyota engine for the next 30 years.

Ash78, voting early and often > Wacko 02/26/2018 at 10:01

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And Lotus...

bhtooefr > Wacko 02/26/2018 at 10:06

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Pretty much - everything is even moving into one engine family, it seems.

bhtooefr > Ash78, voting early and often 02/26/2018 at 10:07

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My guess is that Lotus is moving to Volvo engines, given their new ownership.

Spanfeller is a twat > bhtooefr 02/26/2018 at 10:10

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Long stroke= relatively good torque at low RPM
low RPM torque= no need for high redline
Slow engine=better economy.

BvdV - The Dutch Engineer > bhtooefr 02/26/2018 at 11:12

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That sounds like a very interesing engine design! Also, that CVT sounds intriguing, wonder how it works.

Maybe the rev-matching on upshifts is a result of the high efficiency, as I can imagine such a high efficiency is paired to very low internal friction.

Cé hé sin > BvdV - The Dutch Engineer 02/26/2018 at 12:06

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Two speed automatic box paired to a CVT? Toyota already do a four speed/CVT combination for the Americans which gives a ten speed if you use “virtual” gears with the CVT.

Cé hé sin > BvdV - The Dutch Engineer 02/26/2018 at 12:48

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Here it is. Seems to be what I thought.

BvdV - The Dutch Engineer > Cé hé sin 02/26/2018 at 12:52

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Ah I see, so by putting the strain on the direct drive gear, they can make the rest smaller/lighter, makes sense!