Engine Performance Parameters- 21-22 Best Review

Engine performance parameters

Engine performance parameters are essential for Better Engine running. They can help you understand your Engine and how it is performing and can help you improve the efficiency and performance of your Engine. Engine performance parameters are critical to any engine ‘performance tuning.’ By understanding how Engine performance parameters work and setting them correctly, you can achieve the desired performance for your Engine.

In this post on Engine performance parameters, we will discuss the performance parameters. Performance parameters are the essential criteria for selecting Diesel Engines for Marine propulsion and Diesel generators for power production. Every engine manufacturer considers these parameters for engine manufacturing.

Specifications for Engine performance

  1. Power output
  2. Mechanical Efficiency 
  3. Volumetric Efficiency
  4. Specific Fuel Consumption
  5. Specific Lubricating oil consumption 
  6. Thermal Efficiency & Heat Balance
  7. Specific Output
  8. Effective Pressure and Torque
  9. Fuel Air-Ratio
  10. Exhaust Smoke and Emissions
  11. Calorific value of fuel

Diesel Generating Set Engine performance parameters

  1. Load on Alternator
  2. Load on Engine
  3. Alternator % Load
  4. Percentage loading on engine
  5. Specific power generation

Engine Ratings for the Ships propulsion

Rating for the Diesel Engines is important parameter. Rating is denoted as BHP or KW per cylinder at a RPM. Ratings are of the following types

  • Continuous Service rating
  • Maximum continuous rating
  • Overload rating

Engine users consider the maximum output generated at which an engine will operate continuously.

Power Ratings in Diesel generators Engine performance parameters

As per the ISO 3046, applicable to Diesel generators, following types of ratings are specified.

Continuous Power

Is the brake power as per the certification of manufacturer, at which an engine will continuously operate safely between Engine overhaul periods at the rated speed and ambient temperature.

Overload power

It is the power at 10 percent in excess to the continuous power , which an engine may be allowed to operate for a period of one hour in a period of 12 hours at rated ambient conditions.

Rated Power

 Rated power is the power available at the output shaft at the given speed of the engine.

Important performance data on Engine performance parameters

  Engine performance parameters

Cylinder data

  • Cylinder output – (KW)
  • Pmax– (bar)
  • M.E.P ( mean effective pressure)- (bar)
  • Fuel Pump Index- (mm)

Combustion Air Data

  • Air Mass Flow- ( kg/kWh)
  • Air Pressure (abs)- ( bar)
  • Air Temperature after Compressor- ( 0C )
  • Air temperature after Cooler- ( 0C )

Exhaust Gas Data

  • Mass Flow- ( kg/kWh)
  • Gas Temperature before Turbocharger- ( 0C )
  • Exhaust temp. after Turbocharger- ( 0C )

Data for heat Balance

  • Charge Air- (kj/kWh)
  • Lubricating oil-(kj/kWh)
  • Jacket Cooling Water- (kj/kWh)
  • Exhaust gas- (kj/kWh)
  • Radiation- (kj/kWh)

Fuel Oil Consumption

Engine Performance Parameters
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Specific Fuel Oil Consumption (SFOC) – (gms/kWh)

Criteria for choosing the Diesel generator

  • Loading
  • Speed
  • Cooling System
  • Environment conditions
  • Fuel quality
  • Control system
  • Drive Type
  • Ambient temperature, altitude and humidity.

Engine performance parameters

Engine Condition and performance Data

Changes in the engine condition due to the combustion results will take place during the engine operation. These changes will be fouling of air and exhaust gas pathways in the form of deposits, wear, and corrosion.

Continuous observation and monitoring of data will help prepare a precise and valuable basis for the proper evaluation of the optimum operation and planned engine maintenance.

Engine Performance data (EPD)

Always take the assistance of an expert if there is any deviation in the operating data. 

It is always advisable to record the weekly performance data and compare the data every week, which will assist in the proper evaluation of the engine’s operating condition and performance. 

The best practice is to evaluate the engine performance by comparing it with the Factory acceptance test-bed trial data taken before the delivery of the new engine.

The systematic evaluation of the deviations in the performance data will help diagnose the problem and take the proper action to correct deviations.

Performance Data Evaluation

Charge Air Cooler

Charge air cooler fouling on the air side will manifest in the form of drop-in charge air pressure and increased charge air and exhaust temperature, influencing the decrease in overhauling schedule of exhaust valves. Every increase of charge air temperature by 10 C will increase the exhaust gas temperature by 1.50 C.

Fuel Injection Pump

Load and adequate main pressure of the engine express the supplied energy using the fuel injection inside the cylinder. The value of the fuel pump index reading is equal to the mean pressure. Hence the corresponding value of the pump index is proportional to the load on the engine.

Fuel Injection Pumps and fuel valves will wear down due to the dirt abrasives in fuel. Wear down of Fuel injection components will increase fuel pump index due to excessive fuel leakage.

A defective fuel injection valve will also reduce engine performance’s deviation due to the low opening pressure, blocked holes, and worn down holes. Wrong adjustments of the inlet & exhaust valves and burnt valve seats will also cause the deviation in the engine performance.


In the light of experience, fouling of Turbocharger in the turbine side will increase exhaust gas temperatures. Especially for the engines operating on heavy fuel oil, there will be a restriction in the nozzle ring due to the accumulation of soot and sulfur and will cause abnormal wear down.

Fouling of the nozzle ring will affect the turbocharger efficiency. The low efficiency of the Turbocharger will impact the engine performance. 

Fuel Injectors (Fuel Valves)

Fuel valves will be under the effect of cold corrosion by condensation of sulfur. The overall temperature of the fuel valve is above 180oC. If the temperature falls below this working temperature, there are chances of sulfur condensation resulting in cold corrosion.

The other factor which affects the performance of the nozzle is the presence of abrasive in the fuel. These abrasives will cause an increase in the needle clearances and enlargement of the nozzle holes.

All the above unfavorable conditions will cause decreasing the overhaul intervals of the fuel valves.

Exhaust Valves

Exhaust valve overhaul intervals are the most affecting factor in judging the engine performance. Valve seats burn out due to the unfavourable condition of the wrong fuel and the presence of vanadium and sodium contents. The corrosive effect will take place due to the combination of vanadium and sodium oxides.

Load on the engine and maintenance conditions decide the exhaust valve temperatures.

The proper maintenance of the exhaust valve will keep the valve in cool condition. The cool-running of exhaust valves will enhance the charge air quality and better maximum pressure adjustments.

Overhauling of the valve seats and the use of valve rotators will enhance the performance of the engine.

Engine Room Ventilation

The suitable location of the fresh air intake on the deck in marine and away from the dusty area on land installation is the most affecting factor in reducing the overhauling periods.

The quantity of fresh air supply should be 1.5 times the air consumption of the engine.

Exhaust system 

The increase in exhaust backpressure of the Turbocharger will cause the growth of exhaust valve temperatures. The exhaust backpressure should not exceed 250-300 mm of WC (water Colum).

Best Books on Marine Engineering

Fundamentals of Medium/Heavy Duty Diesel Engines

Fundamentals of Medium Heavy Duty Diesel Engines 6

Based on the 2014 National Automotive Technicians Education Foundation (NATEF) Medium/Heavy Truck Tasks Lists and ASE Certification Test Series for truck and bus specialists, Fundamentals of Medium/Heavy Duty Diesel Engines is designed to address these and other international training standards. The text offers comprehensive coverage of every NATEF task with clarity and precision in a concise format that ensures student comprehension and encourages critical thinking. Fundamentals of Medium/Heavy Duty Diesel Engines describes safe and effective diagnostic, repair, and maintenance procedures for today’s medium and heavy vehicle diesel engines, including the most current, relevant, and practical coverage of: • HD-OBD emission diagnostics • Common rail injection systems

Pounder’s Marine Diesel Engines and Gas Turbines

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Pounder’s Marine Diesel Engines has served seagoing engineers, students of the Certificates of Competency examinations and the marine engineering industry throughout the world.

Now in its ninth edition, Pounder’s retains the directness of approach and attention to essential detail that characterized its predecessors. There are new chapters on monitoring control and HiMSEN engines as well as information on developments in electronic-controlled fuel injection. It is fully updated to cover new legislation including that on emissions and provides details on enhancing overall efficiency and cutting CO2 emissions.
After experience as a seagoing engineer with the British India Steam Navigation Company, Doug Woodyard held editorial positions with the Institution of Mechanical Engineers and the Institute of Marine Engineer

* Helps engineers to understand the latest changes to marine diesel engineers
* Careful organisation of the new edition enables readers to access the information they require
* Brand new chapters focus on monitoring control systems and HiMSEN engines.
* Over 270 high quality, clearly labelled illustrations and figures to aid understanding and help engineers quickly identify what they need to know.

Lamb’s Questions and Answers on the Marine Diesel Engine

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The book is comprehensive and includes almost all topics needed to understand marine diesel engines. The book explains the role of heat in engineering science, the principles behind internal combustion engines, the role of fuels and lubricants, the cooling systems, the lubricating systems and the heat exchangers.

The book also explains the various parts of the marine engines and their functions. Air-storage tanks and air compressors are also dealt with in the book. Information on balancing and vibration, various instrumentation and control methods, along with the safety measures are covered in the book.

Lamb’s Questions and Answers on the Marine Diesel Engine was published by Butterworth-Heinemann in 1990. The eighth revised edition is available in hardcover.

A Pocket Book of Marine Engineering: Questions and Answers

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A Pocket Book of Marine Engineering: Questions and Answers is a book that covers the topic of air filter for engine in great detail. This book is a great resource for anyone who wants to learn more about this topic. The author, John Myatt, is a world-renowned expert on marine engineering. In this book, he covers everything from the basics of how these engines work to more advanced topics like choosing the right air filter for your engine. If you’re looking for a comprehensive guide to air filter for engine, this is the book for you.

This handy pocket-sized guide is filled with hundreds of questions and answers on marine engineering, covering all the basics from engines and propulsion to steering and safety. It’s perfect for anyone who wants to learn more about this fascinating subject, whether they’re studying for a qualification or just interested in how boats work. With clear explanations and plenty of diagrams, this book is an essential reference for anyone with an interest in maritime engineering.

Introduction to Marine Engineering

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This second edition deals comprehensively with all aspects of a ship’s machinery from propulsion and steering to deck machinery and electrical equipment with a strong emphasis upon correct and safe procedures.

Material has been added and revised to reflect the greater weight now being placed upon the cost-effective operation of ships; in terms of greater equipment reliability, more fuel-efficient engines, the ever-increasing shift towards automatically operated machinery, and the need for fewer engineering crew. This is an invaluable guide for professionals but equally covers the requirements for Class 4 and Class 3 Engineer’s Certificates of Competency, the first two years of the Engineer Cadet Training Scheme, and the Engineering Knowledge syllabus for the Master’s Certificate.

Diesel Generator Handbook

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Diesel Generator Handbook meets the need for an authoritative reference work covering the range of mechanical and electrical topics embodied in the practical design and application of diesel generating plant. It will be particularly welcomed in many parts of the developing world where the diesel generator is basic to the electricity supply system.

The discussion covers, in fifteen chapters, the prime mover, power ratings, synchronous generators, load assessment, control principles and systems, switchgear and controlgear, standby power, fuels and lubricating oilss, installation and commissioning, noise reduction, and plant operation and maintenance.

The book thus caters for all who are concerned with the selection, specification, testing, commissioning, operation and maintenance of diesel-based generator systems: not only the practising plant or services engineers, but also non-specialist engineers and users. The young technician or trainee engineer who is embarking on a career in the supply industry will find this handbook an invaluable investment.

L L J Mahon, FIEE, FBIM, after an engineering apprenticeship with BTH in Rugby, gained over 30 years’ experience in the design, development, manufacture, installation and commissioning of both stationary and highly specialised mobile diesel generator plant for a range of applications.

Investigation of Noise and Vibration Levels

Vibration 1

The course contents are planned in such a way that the general requirements of the students are fulfilled. This book is written in easy and simple language, so that an average student can also grasp the concept by self-study. A large number of figures have been added in each chapter to make the subject matter quite understandable to a great extent. The book contains basic fundamental details of Jatropha and aims to lead a student towards understanding its application. The book is written in a very brief manner which will lead to better understanding in short span of time. It contains enormous graphs for better visualisation of the concepts.

Troubleshooting and Repairing Diesel Engines

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This hands-on guide shows, step by step, how to save time and money by learning to identify and fix virtually any diesel engine problem yourself. Thoroughly updated to cover the latest advances in diesel technology, Troubleshooting and Repairing Diesel Engines, Fifth Edition contains hundreds of drawings, schematics, and photographs to ensure success and avoid frustration. This fully revised classic resource equips you with all of the techniques you need to keep diesel engines running in top condition.
Inside, you’ll find:•Up-to-date coverage of biodiesel and green fuels •Step by step troubleshooting procedures •New engine repair procedures and tools •The latest turbocharging methods•Details on new diesel/hydrogen and diesel/methane engines

Reeds Diesel Engine Troubleshooting Handbook

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Most diesel engines will develop a problem at some point in their lives, but armed with the right knowledge a skipper needn’t worry.
The ReedsDiesel EngineTroubleshooting Handbook is a compact, pocket-sized guide to finding solutions to all of the most common engine problems, and many of the less common ones too. The perfect format for quick reference on board, this book will help skippers fix troublesome engines themselves, avoiding costly engineer fees if the problem is simple to sort out, or enabling an emergency patch-up for a more serious problem until they can get back to port.

Each topic addresses a particular engine problem, and gives clear step by step instructions with helpful colour photographs and diagrams showing exactly what to do. Straightforward and accessible, the Reeds Diesel EngineTroubleshooting Handbook should be an essential part of any skipper’s DIY toolkit – and perfect for slipping in the pocket.

Blog Conclusion

We hope you enjoyed our article about Engine performance parameters. We know that people who are not experts often struggle to understand how to tune their engines. In this post, we discussed everything that is related to Engine performance parameters. We know that there are lots of different terms related to engine performance parameters. We wanted to make sure that we covered all the key terms in this article. We hope that you were able to learn something new by reading this post. If you have any thoughts or anything to say, do not hesitate to leave a comment. We would love to hear from you!

Hi, I’m Sham, Founder of marinediesel.co.in. A web site that provides authentic information regarding Marine Diesel Engines, and learn marine Engineering free with us

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