Suzuki has filed 13 separate patents with the U.S. Patent and Trademark Office related to a motorcycle with a turbocharged engine. The patent illustrations show a parallel-Twin engine resembling the XE7 turbocharged engine Suzuki presented at the 2015 Tokyo Motor Show.

The illustration above shows the engine in a motorcycle that closely resembles the Suzuki Recursion, a turbocharged concept shown at the 2013 Tokyo Motor Show. Though only a faint outline, the motorcycle has a similar fairing and the same trellis license plate holder behind the rear wheel. One big difference is the trellis frame and subframe shown in the patent instead of the Recursion’s twin-spar frame.

Turbocharged Suzuki patent diagrams

Figure 2 shows the engine in the frame with two radiators. Figure 6 shows the engine, with Figure 10 highlighting the components of the forced induction system. The turbocharger (121) is located just below where the header pipes join. The airbox (115) and intercooler (131) form a single unit located above the cylinder heads.

Turbocharged Suzuki XE7 engine

The engine shown in the patents looks very similar to the XE7 engine shown at the 2015 Tokyo Motor Show.

The engine still looks to be a mid-size parallel-Twin. Stacked transmission shafts make for a very short powerplant, and this enables what appears to be a very long swingarm, which would reduce the tendency to wheelie.

A few of the patents describe the engine’s lubrication system, the placement of balancer shafts in front of and below the crankshaft, the twin radiator set-up, and a way to make sure cooling water is supplied to the turbocharger when the motorcycle is parked and leaned over on its sidestand.

We know that Suzuki has been working on turbocharger technology for a few years now, and these new patents show signs of progress. We’ve previously published Suzuki patents related to the Recursion but these 13 new patents show significant differences including the use of the XE7 engine. The Recursion was said to use a 588cc engine and the XE7 looked to be close to that displacement, as does the powerplant in the patents. The detail involved in illustrating the engine and the frame indicate they will be close to the finished product, while the less distinct Recursion-shaped outline may be just a temporary placeholder before the design is finalized.

Turbocharged Suzuki patent diagram right sideTurbocharged Suzuki patent diagram left side

If (when?) Suzuki’s turbocharged motorcycle goes into production, it may not bear the Recursion name. Though Suzuki has registered trademarks for “Recursion,” the company has also registered for trademarks for “Katana” and the symbol for “Gamma,” two classic Suzuki names that would be intriguing fits for a new turbocharged model.

  • spiff

    500cc turbocharged Gamma! Say around 350 pounds?

    • Clayton Bigsby III

      Can you say “holey piston gamma guy!”? I thought you could! I owned a gamma. its turbo has no moving parts.

      • spiff

        The Gamma was the arch nemesis in my young day dreams. I was a Yamaha kid, and had all sorts of plans for an ultimate RZV.

  • Dootin

    Oh baby!

  • Mahatma

    a 500cc turbo charged engine?doesn’t that induce lag and peaky powerband which is cured by using a bigger displacement without turbo?Is it because emissions and fuel economy?

    • Bryan Spears

      Lag and peaky powerband are symptoms of poor turbo implementation (for this application). Like many turbo cars today, they could (should) use a smallish variable vane turbo that doesn’t hit the max hp numbers of the big turbos.. but gives solid boost from low RPM, and a wide powerband.

      edit: A good example would be the Aerocharger 53 series, tuned to increase max hp by ~20-25%.. which I’d love to add to a new striple 765. /drool

  • kenneth_moore

    In the comments gollowing a recent article on the supercharged H2, Mr. Duke was pretty skeptical that there’s a place for forced induction in motorcycles. His arguments were pretty convincing.

    Personally I’d like to see it happen. Motorcycles don’t have to make sense, they just have to be perceived as “cool” (thus HD’s success). A turbocharged motorcycle IS cool, by default, regardless of how much sense it does or doesn’t make from a strictly objective perspective.

    • Kevin Duke

      I have greater optimism for small, variable-vane turbos on future bikes than I do for superchargers like the H2’s, but I’ll ride either!

  • Old MOron

    Good info, DC. Thank you!

  • maybe finally get some redemption for the short lived B-King…aka the ‘boost’ king that didn’t have any actual boost

  • mikstr

    Sadly, should they go ahead with this, I hope they give it a 270-degree crank (mimicking a 90-degree v-twin) or some other “funky” phasing (ie. not 180 or 360) else this thing risks sounding, dare I say…. industrial. Motorcycling being a largely visceral thing, a drab exhaust note could result in a still birth… I am finding the second coming of trellis frames interesting…

  • DickRuble

    At this pace they’ll build one when hell freezes over.

  • Russ Archer

    I remember reading the “1980s Turbo Bikes Shootout” article. Really fascinating read. Let’s hope Suzuki fares better with modern turbocharging than they did in that article.

  • spiff

    Buell had planned for the gas in frame bikes to be Turbocharged. The HD brass said no. Think of 150 horsepower big twins. That could be fun. (Oh Polaris, you could still give us the 156 bike.)

  • 9900 GT

    let it come suzu