John Tangerås from Norway thought we might like to see a motorcycle he currently has under construction, the Tangerås Verksted & Støperi T900. The new 21st century builders, like John, start with CAD drawings, detailing all of the various components, including the engine, and when the design is to his liking the build begins.
Unlike the old school cut and weld, re-cut and re-weld builders, the 21st century process enables a designer to create everything on a computer screen, including the engine, and then, with the addition of 3D printing, create patterns for molds to cast the components. Combined with CNC machining, a builder today can create custom motorcycles he could only dream of creating in the past, unless he worked for a large manufacturer.
Here’s how John describes what he’s doing:
The engine is a 900cc vertical twin, 180 degree crank throw. Air cooled. 4 valves per cylinder and hydraulic lash adjusters under double overhead cams. The cams are driven by gearwheels. The cylinder and upper crankcase is one unit. The power is calculated to about 72 hp.
The engine is 100% production ready. Most of the steel parts for the engine are semi-finished, and molds for casting the cylinder head and crankcases will be commenced later this month. CNC programming is done for all parts and casting simulation performed for all castings.
The gearbox assembly has been 3D printed and cast in polyurethane for function testing. The actual steel gears will be made later this year.
The engine is a structural member of the chassis. The headstock is bolted to the cylinder head via aluminum tubing. The “boomerang” shaped aluminum subframe is a hollow part doubling as an air filter box and battery carrier. The rear frame is bolted to the subframe.
The single arm swingarm is aluminim and bolted to the engine cases. The wheels are both forged aluminim Marchesini’s, and the brakes are Brembo. Belt drive.
Originally, I intended to cast the subframe in magnesium, but due to time pressure, I will machine the components in aluminim and weld it. The same goes for the oil pan and camshaft cover, to be machined from billet aluminim. The lower crankcase will be cast in magnesium, though.
John also adds, “The rendered pics are missing a few frame components such as footrests and lights as they are yet to be modeled. I am too busy making engine parts at the moment!”
Not a problem, John, what you’ve done so far is great!
I am constantly amazed at the number of builders creating motorcycles entirely from scratch, right down to the engine. The capabilities of CAD, CNC and now 3D printing are spreading to many more shops and garages. The potential builds we’ve yet to see, like this T900, can really get a person excited.
And, John, we will be awaiting progress reports and a video of the finished T900 when it’s on the road. Nice work!