In a new white paper, WinGD discusses how Variable Compression Ratio (VCR) technology can be applied to existing LNG dual-fuel engines to deliver measurable emissions reductions within the timeframe set by the IMO’s 2030 targets.
Most ships trading in 2030 will not be newbuilds. This means decarbonisation solutions must extend beyond future engine platforms and focus on improving the performance of engines already in service. This is the central focus of WinGD‘s white paper, titled “LNG-fuelled fleets reducing emissions: VCR retrofitting as a ready solution”.
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VCR tech
By dynamically adjusting the compression ratio in real time, VCR optimises combustion across varying loads and operating conditions. In practice, this translates into lower fuel consumption in both gas and diesel modes, alongside significant reductions in methane slip at partial loads.
VCR technology is available as standard on WinGD’s X-DF2.0 engines and retrofit-ready for existing X-DF LNG dual-fuel engines. The solution is also available for the RT-flex50DF engines. There are around fifty engines in the global fleet that could be retrofitted, extending the benefits of VCR technology to a broader installed base of LNG dual-fuel vessels already in operation.
No operational disruption
One of the key design objectives with VCR was to ensure it could be deployed with minimal impact on vessel operation. The system is fully integrated into the engine control architecture and requires no crew intervention.
Just as importantly, VCR retrofits can be carried out during scheduled dry-dockings. This allows operators to turn planned maintenance into a performance upgrade, avoiding additional off-hire time while delivering tangible environmental and commercial benefits.
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Early adoption and market uptake
The commercial case for VCR became clear quickly. Since its launch in 2023, more than 170 orders have been placed for VCR systems. While early uptake has been strongest in the LNG carrier segment, interest is broadening, with orders now spanning pure car and truck carriers, bulk carriers and container ships.
This growing adoption reflects a wider industry realisation: improving the efficiency of LNG engines already in service is one of the fastest and most scalable ways to reduce emissions this decade. For many operators, VCR offers a practical way to deliver measurable results now, rather than waiting for future fuel pathways to mature.
Compatable with future fuels
Since its introduction, VCR has moved rapidly from development into commercial operation. At the same time, it supports longer-term fuel strategies. While optimised for LNG today, the technology is compatible with future fuels, helping shipowners manage uncertainty while protecting asset value.
WinGd sees VCR as a pragmatic approach to decarbonisation. It does not rely on unproven infrastructure or future regulation; it delivers measurable improvements using technology that is available now. For shipowners operating LNG-fuelled vessels, it offers a credible path to reducing emissions, lowering operating costs and extending the useful life of existing assets.
The white paper “LNG-fuelled fleets reducing emissions: VCR retrofitting as a ready solution” is available for download from the WinGD website.
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