contact us :

RVCR -The Next Evolutionary Leap in Prime-Mover Technology

Getting you future ready with RVCR Products

RVCR I.C. Engine: - Making VCR Engine Viable

We are in an endeavor to Design & Develop I.C. Engines utilizing the ‘RVCR Kinematic Mechanism Concept’ as a part of our Plan to provide the Transport and energy industry with new generation of Prime Movers, which cater to the market driver of the 21st century. Among the various Prime-movers our Primary focus is dedicated on RVCR I.C. Engines which is now at TRL 5/6 (Technology Readiness Level). The project is now entering the next Phase to reach TRL7 with the objective to develop a ‘Pilot Demonstrator Engine’ (specifications detailed in the project report) as per our business strategy with considerations to the Serviceable Addressable Market.


The project and the Business operations Growth is now reaching Technology readiness state of TRL -6 where its pace had slowed for systemic limitations in India for the projects further growth in technological and commercial terms.

GYATK has now shifted its Projects operations base to UK where it has developed its network of value chain and gained traction with EU based funding scheme Horizon 20-20. The Project progress part is covered in the ‘GYATK’s Growth against timeline’ document.

Click here for Growth against Time line

The Prelude

The Project is a ‘Green-field Techno-commercial Endeavour’ in the true sense with no existing Technological precedence of its kind. RVCR I.C. Engine Design and Development Project by GYATK is primarily extrapolation of the core RVCR Technology development scheme, by focus on 4 strategic aspects as a carefully thought out strategy (detailed in the “about Technology” Section).

The equivalence of this specialized Project Proposition can be mapped to commercial R&D business in ‘Prime-Mover/Powertrain Engineering’ Industry to gain perspective of the various aspects of the RVCR business dynamics.

The Next Phase

The project is now set to take-up its Next Phase and is part of GYATK’s coordinated RVCR commercialization plan which involves handling of Parallel Projects by customization of the root algorithms of the RVCR mechanism for the specification needs. The technology structure is developed to suit this, and the details are covered in the ‘about Technology’ page.

The next milestone of the RVCR I.C. Engine project is to reach TRL -7 whereby a pilot demonstrator Engine of the defined ‘Minimum Viable Product’ specification.

Click here for the Project Plan document

The Engine specification selected for the TRL-7 milestone is 150 Bhp Modular Engine that produces high torque at slow speeds, to serve as a Pilot Demonstrator Engine for small vessels in the Maritime/Inland waterways sectors and Customized Vehicle application. The choice of the segments is based on various business factors listed below

  • Market need and Opportunity Analysis.
  • Ease of product suiting to the end use application. Maritime segment has flexibility in space, volume and transmission requirement.
  • Regulatory stringency of the sector in various geographic Zones.
  • Product acceptance and Demand for novelty Quotient.
  • Platform for Product validation and ease of grounding the RVCR engine.
  • The Power rating requirement achieved by coupling Multiple Modular Engine Units (300, 450, 600 HP) to cover a range of sectors and segment’s needs.
  • The Ease of designing the Product.
  • The Ease of scaling up of the product.
  • The precursor to the Integrated Hybrid RVCR engine that would provide platform Engines with options to integrate electric, choice between Clean Combustion of fossil fuel and use of Green bio fuels.

RVCR I.C. Engine synopsis

RVCR mechanism is a superior alternative to the century old ‘Slider Crank mechanism’ that combines the efficiency gains of ‘Positive Displacement mechanism’ and the Compactness of ‘Rotary Mechanism’ and deliver the long pursued and illusive feature called ‘Variable Compression Ratio’ (VCR) in Engines.

The RVCR mechanism is an entirely new dimension in Kinematics (Click for Details) and the sequential motion of the various components (Links) requisite to fructify the mandatory Gas Processes in I.C. Engines is achieved in a smarter, compacter way. The conventional reciprocating motion of cylindrical piston is a source of major limitations and RVCR eliminates it. The piston and the liner are bent wherein the piston when sliding in the liner is a rotary motion which is directly transferred to a central shaft.

It yields a whole new method to control the quality of fuel combustion and the way energy is converted to torque and outputs several unprecedented capabilities in engines which is summarized below.

Radical New Capabilities

  • RVCR allows analogous ‘Compression Ratio’ (CR) variation to suit the fuel opted to drive the engine.
  • Reduce consumption by real time VCR to deliver peak efficiency over entire Load Range.
  • Increased Specific Power through Multiple Double-acting Pistons in One single continuous enclosed Liner & 100 % Mechanical Leverage.

Unique Capabilities

  • Enhanced thermodynamic Efficiency from Constant Volume Heat addition and removal.
  • Slow Speed High Expansion rate with Low heat dissipation surface area
  • High Specific Power through Multiple Double-acting Pistons in a single continuous Liner.

It costs less for making an RVCR engine of equivalent power rating to that made using conventional crank mechanism, for the reduction in the total amount of Material and the number of Manufacturing processes required.

The downsizing improves on the Power to weight drastically and the degree of compactness increases with Power Rating.

RVCR Design provides the flexibility to manipulate the volume in 3 dimensions to suit to volume and space requirements.

General Description

Introduction to Engines

In I.C. Engines the chemical energy of fuel, (burning of gas/petrol, Diesel, heavy oil etc) is converted into mechanical kinetic energy (rotation of the wheels of a car). This conversion is affected by use of crank or Rotary turbine mechanism . Engines provide drive power to cars, trains, generators, prime movers, material handling equipment’s, cranes, earth movers, ships, aircrafts and helicopters etc.

History of engines

I.C. Engines form the heart of any automotive unit and the Crank mechanism forms the core of an engine. The crank mechanism in use today was invented in medieval times and later developed in Western Europe in late 19th and early 20th century. The conventional Engines use the same base Crank Mechanism, and this has not changed though various incremental developments and auxiliary systems have improved the efficiency of engines through the 20th century. The Crank Mechanism based engines have been researched to the extent that now it is more or less saturated, and it is not able to suffice for the current and forthcoming challenges of the I.C. Engine Industry. The various challenges to the engine industry in the 21st century which originate from fossil fuel usage that leads to greenhouse effect and other emission. RVCR is the next generation alternative to Crank Mechanism that helps to solve the modern-day challenges.

How conventional engine works

Engines are machines where fuel is burnt inside a combustion chamber instantaneously, in an controlled rapid combustion with air and heat. The pressure rise due to combustions propels the burnt gases at high velocities in all direction and exerts a pushing force on the walls of the chamber within which the combustion occurs. The pushing gases are thwarted by rigid walls of the chamber leading to an increase in the pressure of the gases within the chamber; however, one of the chamber’s inner walls is not rigidly fixed to the other immobile parts of the chamber. This element is called the Piston which is a solid straight metallic cylinder that fits closely inside a straight cylindrical shaped tube called ‘Liner’ and the gases push the piston outward in a straight line in this tube. The motion of the piston is guided and constrained in a straight line by the liner, very much like a syringe. This straight-line movement of the piston is converted into rotation of a shaft with help of a connecting rod and a crank which finally drives the rotation of wheels of a car, or bike etc. The crank mechanism converts the energy within the fossil fuel into rotation of the wheels.

The VCR Feature in I.C. Engines:

The current challenges of the IC Engine industry, namely stricter EMISSION NORMS & HIGHER FUEL EFFICIENCY can be best addressed by VCR or variable compression ratio. The VCR aspect in engines has long been researched by almost all players in the industry and academia. The test results of experiments and performance trials on numerous engine models, capable of achieving VCR has demonstrated the benefits, advantages and implications of VCR which is well published and universally accepted. It is an established fact that I.C. Engines can achieve huge improvements in all key performance parameters if the compression ratio of engines could be varied while the engine is in operation.

The VCR feature is possible in conventional engines by incremental attachments to the elements of the crank mechanism. These require fitting of large number complicated add-on component mechanism, making conventional VCR Engines Commercially nonviable. Though engines which achieve VCR to certain limited extent were successfully made, these engines have largely remained experimental engines and are not commercial products. (Most provide limited range of VCR E.g. only two choice of compression ratio).

VCR “Variable Compression Ratio,” is a feature in IC Engines (e.g. Car or Truck Engines) which improves on the Fuel efficiency that has its origin in early 20th century. This feature leads to higher fuel efficiency and various other advantages like downsizing and enhanced emission control. Furthermore, it also makes an engine fuel flexible, e.g. the gasoline engine can run on other fuels like Diesel, CNG, LNG, Hydrogen etc. However, this feature eluded almost every Auto major trying their hands on it. Limited VCR engine prototypes have been successfully tested; however, it has remained commercially unviable for almost a century. These Research models have provided valuable information on the benefits of VCR and it is empirically known that VCR leads to benefits listed above. The failure in achieving successful VCR engines is mainly because all these models are based on incremental developments and additions to base Crank Mechanism. VCR feature in Engines using Crank Mechanism is extremely cumbersome and complicated. The VCR range of such engines is limited to a very small range. Some models provide a choice of only two Compression Ratio (CR) options. These VCR technologies are also parasitic as the additional components utilized to enable VCR draws its drive power from the mother engine, hence negating the gains due to VCR.

RVCR Solution - Making VCR Commercially Viable

RVCR – Roto Dynamic VCR developed by GYATK solves the limitation of crank Mechanism based VCR’s and enables analogous variations in CR (6.1 – 22.1) that covers the entire spectrum of fossil and bio fuels, ranging from lighter gaseous (auto-igniting) fuels to self-igniting Heavier Fuel Oils (HFO). RVCR in effect enables a quantum leap in combustion control not just through the fuel spectrum but furthermore, an analogous variation through the load range (idling to overload) of any specific fuel. RVCR is the first ever 3 element combustion control enhancing efficiency by charge/air compression pressure manipulation enabling peak pressure and temperature control. Hence, the conventional qualitative and quantitative fuel control compliments the base air pressure control.

Technical Details