Discussing Advantages/Disadvantages of 2-Stroke Turbocharged CI Engines

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Discussion Overview

The discussion focuses on the advantages and disadvantages of 2-stroke turbocharged compression ignition (CI) engines compared to other engine types, including 2-stroke spark ignition (SI) and 4-stroke CI engines. Participants explore various applications, performance characteristics, and emissions concerns related to these engine configurations.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant notes that 2-stroke engines generate more power for the same size, suggesting that a turbocharged CI engine could be advantageous due to its compactness.
  • Another participant argues that the application of the engine is crucial, stating that 2-stroke engines excel in small and large applications but face challenges in passenger vehicles due to emissions and maintenance issues.
  • Concerns about emissions from 2-stroke engines are raised, particularly regarding their smoky performance, which may not meet modern standards in passenger cars.
  • One participant suggests that turbocharging a CI engine could reduce smoke from burning lubricating oil, potentially addressing some emissions concerns.
  • Links to external discussions on engines, including rotary engines, are shared for further exploration of the topic.

Areas of Agreement / Disagreement

Participants express differing views on the practicality and application of 2-stroke turbocharged CI engines, with some emphasizing their advantages in specific contexts while others highlight significant drawbacks, particularly regarding emissions and maintenance. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Participants acknowledge the complexity of emissions standards and the varying importance of performance versus environmental concerns across different applications. There are also references to the limitations of 2-stroke engines in meeting modern emissions requirements.

ank_gl
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ok now my practicals are 15 days away and i n my friends constantly discuss about advantages and disadvantages of several combinations like 2-stroke SI engine with supercharging or 4stroke CI with CRDi etc etc. since people here are more experienced and have far more facilities than i do, i want to discuss it. so far we have picked out a 2stroke turbocharged CI engine. a 2 stroke obviously generates more power and therefore for same power output, ll be smaller. 2 stroke has a more smoky performance due to burning of lubricating oil, but with a turbocharger, air can be directly directed through a manifold to the cylinder and also crankcase can be wet. and many more things. then why don't we see this combination much in use? what are the further advantages and disadvantages. also i am not much of an expert in this subject, i have the book knowledge and i do know the system pretty well, but still i want to discuss a lot about it. hope i can get a discussion going
 
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It all depends on application. 2 strokes tend to win most of the performance/efficiency balances for very small (model aircraft, petrol hedgetrimmer etc) engines, and very large (marine propulsion, 8MW power generation etc) engines. Emissions don't matter so much on the small engines, where low cost and simplicity are more important. And very large (expensive) engines can afford to use clever control and combustion systems to optimise efficiency, and clean up the emissions afterwards.

As you said, 2 strokes have smoky performance; this would be difficult to clean up in your average passenger car sufficiently well to pass modern emissions standards. Add to this the extra maintenance and noise you'd likely have to endure, and consider that you probably wouldn't be getting much more performance (and we don't struggle to get enough power for a car out of a 4 stroke anyway) and you'll see why 4 strokes are generally preferred.
 
thats why i said we can turbocharge a CI engine, then smoke bcoz of the burning of lubricating oil ll be reduced
 
http://people.bath.ac.uk/ccsshb/12cyl/
 
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Some interesting discussion going on about engines including rotary engines over at the Hoverclub of America forum.

Link:
http://www.hoverclubofamerica.org/forum/index.php?showtopic=1360
 
Last edited by a moderator:

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