Scania does it right

[enginesrus]

The S13 coming to the US truck market. No EGR Cooler, and 23:1 Compression Ratio, and high thermal efficiency, its about time.

 

[TugboatEng]

Scania came to the USA Marine market. They never caught on, junk engines with lots of problems. The favorite I heard was cooling water pipes that would pop out of their sockets because they had no retainers.

 

[BrianPetersen]

More information (couple years ago)

https://www.scania.com/content/dam/

http://www/market/master/campaigns/...res/Scania-Super-13-litre-engine-brochure.pdf

Has dual SCR systems ... I'm not sure how this provides a benefit over single-point AdBlue injection. As long as it's squirted in before the SCR catalyst, it should have the same effect, no?

Dual overhead camshafts. Interesting.

Available on International trucks in North America.

https://www.internationaltrucks.com/engines/s13integrated

 

[gruntguru]

50% BTE. I need to catch up - didn't know truck engines had reached those levels. Anyone know how they did it? No evidence of (electric) turbocompounding in the pictures. No doubt some accelerated combustion strategies in there.

je suis charlie

 

[BrianPetersen]

I have a suspicion, with no way to confirm, that they have some Atkinson/Miller cycle happening.

 

[TugboatEng]

Modern diesel engines over 100 horsepower are Miller cycle. Thermal efficiency is in the mid to high 30's.

 

[PJGD]

Recent truck engines are able to reach 50% BTE through a lot of attention to detail. There is no silver bullet, just many small incremental improvements to things like low friction bore coatings, thermal barrier coatings, low leakage injection systems, Miller/Atkinson valve timings, modifications that enable a reduced demand for lube oil flow and pressure such as controlling piston cooling flow to exactly match piston thermal loading instead of continuous full flow, variable displacement oil pumps, electric water pumps, further refinements to the combustion and boosting systems, down speeding, etc.

Look for the DOE SuperTruck presentations from the Annual Merit Reviews for more detail.