2 ms·

Most of the production engines still use tumble flow combustion For reference: Nissan e-power with recuperation ~50%: https://www.nissan-global.com/EN/INNOVATI

by ylk1 2y ago

Most of the production engines still use tumble flow combustion For reference: Nissan e-power with recuperation ~50%: https://www.nissan-global.com/EN/INNOVATION/TECHNOLOGY/ARCHIVE/E_POWER50/ https://www.nissan-global.com/EN/INNOVATION/TECHNOLOGY/ARCHI... Mahle ~45% with pre-chamber: https://www.mobilityengineeringtech.com/component/content/article/44223-sae-ma-03541 https://www.mobilityengineeringtech.com/component/content/ar... Toyota dynamic force engines ~40% : https://www.thedrive.com/tech/18919/toyota-develops-worlds-most-thermally-efficient-2-0-liter-engine https://www.thedrive.com/tech/18919/toyota-develops-worlds-m... Toyota's newest engines claim even more: https://global.toyota/en/newsroom/corporate/40850156.html https://global.toyota/en/newsroom/corporate/40850156.html Honda hybrid ~40%: https://hondanews.com/en-US/honda-automobiles/releases/release-1503019bd8a757ea08267d7944378955-honda-two-motor-hybrid-electric-system https://hondanews.com/en-US/honda-automobiles/releases/relea... Startup Carnot engines claim 70% efficiency: https://carnotengines.com/technology/ https://carnotengines.com/technology/

rasz 2y ago
>Mahle ~45% with pre-chamber That looks deceptively simple and counterintuitive. Mentioned Honda CVCC injects fresh air/fuel mixture into pre chamber. Mahle passive doesnt at all. How does it accomplish detonation in the first place? How does the fresh air/fuel get into the chamber thru those tiny nozzle openings? there must be something they arent showing like additional channel leading close to intake valve.
cedws 2y ago
What’s the catch with the Carnot engine? If if’s real then surely this would be a global news worthy breakthrough?
- tweetle_beetle 2y ago
  > Carnot is targeting the hardest to abate sectors including [long haul] marine [transportation], heavy-duty vehicles and primary off grid power. Even if great advances were being made, these are not very interesting sectors to the vast majority of people and the industries have massive inertia. Presumably Carnot's therefore unlikely to be grabbing headlines.
  - cedws 2y ago
    But such an improvement in efficiency would surely reduce fuel costs, which matter a lot to consumers, though maybe not in the US where it’s cheap.

by ylk1 2y ago

rasz 2y ago

>Mahle ~45% with pre-chamber That looks deceptively simple and counterintuitive. Mentioned Honda CVCC injects fresh air/fuel mixture into pre chamber. Mahle passive doesnt at all. How does it accomplish detonation in the first place? How does the fresh air/fuel get into the chamber thru those tiny nozzle openings? there must be something they arent showing like additional channel leading close to intake valve.

cedws 2y ago

What’s the catch with the Carnot engine? If if’s real then surely this would be a global news worthy breakthrough?

tweetle_beetle 2y ago
> Carnot is targeting the hardest to abate sectors including [long haul] marine [transportation], heavy-duty vehicles and primary off grid power. Even if great advances were being made, these are not very interesting sectors to the vast majority of people and the industries have massive inertia. Presumably Carnot's therefore unlikely to be grabbing headlines.
- cedws 2y ago
  But such an improvement in efficiency would surely reduce fuel costs, which matter a lot to consumers, though maybe not in the US where it’s cheap.