Toyota NR engine features

[Daox]

Originally Posted by freebeard

I wonder if ecomodderers with water-cooled engines could re-create the two-thermostat system elsewhere.

I think it should be possible, but you'd probably need to do some work to the block water passages, and go to some form of external water pump.

[oil pan 4]

Originally Posted by freebeard

I wonder if ecomodderers with water-cooled engines could re-create the two-thermostat system elsewhere.

It happens all the time in drag racing.
A copper head gasket with holes only for the pistons and maybe a few to let out trapped air bubbles in the block combined with after market heads that have large cooling passages for separate cooling.

[jamesqf]

Originally Posted by oil pan 4

It happens all the time in drag racing.

Yeah, but how long does a drag racing engine have to run? 10 seconds or so?

[oil pan 4]

A few minutes to warm up, depending on the class.
The problem with running the bores cold is they will wear faster.
And I definitely would not advise separate warming on an iron block aluminum head engine

[ThermionicScott]

Originally Posted by oil pan 4

And I definitely would not advise [...] an iron block aluminum head engine

Agreed. RIP Quad-4 Beretta.

[freebeard]

Originally Posted by jamesqf

Yeah, but how long does a drag racing engine have to run? 10 seconds or so?

Maybe, unless you are planning on successive passes on the way to the eventual win and the trophy girl.

oil pan 4 — I guess Edelbrock heads on a French military flathead block is out.

[Ecky]

Thanks for the info, lots of neat stuff. I agree with the assessment that we're rapidly approaching the end of the ICE in most vehicles, but I imagine it will continue to live on in large and heavy applications, such as trucking, at least for a time.

Me going off on a tangent, but I'd love to see trains come back, as they are (or can be) a much more highly efficient means of moving things. The problem with trains (as I see it) is that they can't reach everywhere, and people want a car when they get to their destination. However as self-driving cars become more mainstream we're likely to see personal ownership gradually wane, especially in cities. People can catch cheap mass transit (bus, train) to a location, then get picked up by an inexpensive self-driving car for local transport. Since cars won't need to travel long distances, the limitations of batteries will become largely irrelevant. At that point we can start tearing up, or at least downsizing our network of roads...

[bhtooefr]

Originally Posted by oil pan 4

A few minutes to warm up, depending on the class.
The problem with running the bores cold is they will wear faster.
And I definitely would not advise separate warming on an iron block aluminum head engine

Volkswagen does it from the factory on the EA288 diesels...

Of course, it's Volkswagen, with all of the reliability implications that come from them... and the EA288s haven't been around long enough to know how that actually works reliability-wise in the real world. (And, in the US market, they had barely launched before their cheating was made public.)

[NHB]

Originally Posted by bhtooefr

Volkswagen does it from the factory on the EA288 diesels...

Of course, it's Volkswagen, with all of the reliability implications that come from them... and the EA288s haven't been around long enough to know how that actually works reliability-wise in the real world. (And, in the US market, they had barely launched before their cheating was made public.)

VW has used these features a long time in most of their engines. For example their most popular gasoline engines EA211 and EA888 3. generation have been very reliable. Their latest versios have some new features but here is VW's old tried and tested system explained:
https://s3-eu-west-1.amazonaws.com/m...are/18TFSI.pdf

Multi-circuit cooling system nothing unusual these days. It gives shorter engine warm up phase and speeds up passenger compartment heating. That is something everybody wants. Here are two examples:
Ford Fiesta
Green Car Congress: Peugeot 2008 crossover delivers CO2 emissions as low as 99g/km for gasoline, 98 g/km for diesel

[bhtooefr]

EA211 has an aluminum block, though, and oil pan 4 was talking about mixed material engines using these strategies being a bad idea. Valid for EA888 Gen 3, though, that is a mixed material engine. (Also, by US standards, EA888 Gen 2.5 (we don't get the true Gen 3, IIRC) has been considered unreliable (then again, basically every recent VW engine other than the EA113 2.0 8v is unreliable by US standards), although not for that reason.)

Back towards the topic, though, it looks like Toyota is switching from the 1NR-FE, to the 2NR-FKE for the European-market Yaris: http://newsroom.toyota.eu/new-15-l-p...for-the-yaris/

Larger displacement, more power and torque everywhere, but they also went to the wide authority VVT version, which enables Atkinson cycle operation for higher efficiency, and they're doing this due to more accurate European fuel economy test cycles, to improve real-world efficiency.