The elusive V3 engine
The V3 engine is as rare as a unicorn, appearing only sporadically in motorcycle history. The first known example of this layout was invented by German motorcycle manufacturer DKW in 1955, with two cylinders on one side of the V and one on the other, to power their two-stroke Grand Prix racers.
Suzuki dabbled with 50cc racing cars of this configuration in the late 1960s, but due to regulatory changes it never saw the light of day, and the V3 engine did not appear again until the 1980s, powering Honda’s 500cc two-stroke Grand Prix racers from 1982 to 1984, and 250cc and 400cc road two-stroke models until 1987. The compact V3 engine configuration gradually faded into obscurity and was replaced by the extremely popular inline four-cylinder and V4 layouts in subsequent decades. Well, the elusive V3 is now ready to return in the 21st century.
Honda
Honda revives V3 after four years
At last year’s EICMA (the annual Milan motorcycle show), Honda surprised us all with its latest innovation – a modern 75-degree V3 engine with forced induction. The engine is mounted within a steel trellis frame, with inverted forks at the front, a single-sided swingarm at the rear, and 17-inch alloy wheels shod with Pirelli tires, all of which point to the platform’s sporting intentions. This year, the Japanese manufacturer went a step further and unveiled a camouflaged V3R 900 E-compressor prototype, suggesting that a production version is closer than we initially thought.
What’s so special about this motor?
Historically all previous V3 engines were two-stroke engines. Honda’s latest offering is a liquid-cooled four-stroke engine with cylinder banks at a 75-degree angle and a claimed capacity of 900cc. But what really stands out is the incorporation of forced induction, which is rare on a motorcycle.
While all four major Japanese manufacturers produced turbocharged bikes in the 1980s, the trend was short-lived and was stifled by unpredictable power delivery due to lag, weight, complexity, and cost. The only mainstream forced-induction motorcycles in the modern era are Kawasaki’s H2 series of supercharged inline-four machines. Honda is now looking to change that with their V3 engine, which ditches turbocharging and supercharging in favor of a novel forced induction approach – an electronically controlled compressor mounted on top of the front exhaust cylinder to feed the airbox.
why this is important
Honda’s system allows boost pressure to be controlled independently of engine speed or exhaust speed, meaning the engine can deliver high torque even at low revs. The ECU can direct the compressor to spin and help the engine instantly produce the power the rider’s right wrist demands, eliminating turbo-related lag and parasitic losses from the supercharger while saving a ton of weight in the process. The whole engine is packaged very well and slim, and Honda claims this compact 900cc three-cylinder engine will produce the same power as a conventional naturally aspirated 1,200cc engine, which we imagine is in the 200-horsepower range.
bottom line
Honda has always been at the forefront of motorcycle engine innovation. They created the stunning inline-six-cylinder oval-piston 32-valve V4 in the CBX 1000, NR500 and NR750, and the highest-revving production motorcycle engine ever – a small inline-four in the CBR250RR that revs at 20,000 rpm. Nowadays, with most manufacturers focused on building small, affordable twins and developing electric vehicle technology, the age of innovation in the internal combustion engine world seems to be over, but Honda comes to the rescue with technology the world has never seen before. We can’t wait to see what they come up with next.
This article was originally published by Autoblog on December 14, 2025 and first appeared in the News section. Click here to add Autoblog as your preferred source.
