The New Petrol Engine Built To Run Underwater

Engineering for Deep Water

Hydraulic lock has historically been the silent killer of combustion engines during deep water crossings. When liquid enters a cylinder on the compression stroke, pistons stop instantly and mechanical catastrophe follows. Horse Powertrain, a joint venture between Renault and Geely, aims to solve this vulnerability entirely with the B20 engine. Designed specifically for off-roaders, SUVs, and pickup trucks, this unit can maintain operation at a depth of 1.1 metres while tackling severe loads such as a 100 percent gradient.

Inside the Waterproof Design

The unit achieves its waterproof credentials through an enclosed architecture with specific joints protecting the connection to the gearbox, backed by an IPX8 rating. Electronics and sensors share this rating, allowing the control system to detect submersion and automatically adjust throttle response or limit power. Beyond its amphibious talents, the turbocharged 2.0-litre four-cylinder block runs on the Miller cycle and weighs 130 kilograms. Autocar notes that the B20 achieves 48 percent thermal efficiency.

What It Means for Buyers

For drivers looking at future hybrids, plug-in hybrids, or range extender vehicles, this technology removes traditional wading limitations without requiring standard aftermarket snorkels. The engine develops between 189 and 280 horsepower alongside 221 to 280 pound-feet of torque depending on the setup, while alternative reports list output figures reaching 252 horsepower and 380 Nm. High pressure injection, specialized piston crowns designed for turbulence, and a variable displacement oil pump all target reduced fuel consumption during everyday motoring.

The Verdict

Watch for upcoming hybrid off road models carrying this technology if your routine involves deep river crossings or flooded tracks. While traditional snorkels keep air flowing from above, this powertrain ensures the mechanical heart survives even if the engine bay goes entirely under.