Here is another example of superb engineering from the land of the Kiwi, it’s the Engrich ART (Appel Richardson Twin) motorcycle, powered by a fully balanced, 360 degree, 1200cc parallel twin. There’s so much to look at here, it’s difficult to know where to start.
You might think this is a beautifully designed upright standard motorcycle, and it is that, but upon closer examination you notice the CNC machined components, over 200 of them, which include the hollow, two piece, 6061 aluminum, bolt together backbone frame and even the tank, which consists of 11 parts TIG welded together.
The engine is a story in itself. This is a 360 degree parallel twin, which means both pistons move up and down in sync, one or the other cylinder firing on each complete revolution of the crankshaft. This can result in considerable vibration, especially at idle, but this twin utilizes a half stroke, tungsten balance piston located between the two outboard pistons, an idea from Bert Hopwood, but finally realized by the Engrich team.
‘You notice the smoothness most at idle,’ says Leigh Richardson, one of the Engrich’s four creators. ‘When a normal 360 twin would be shaking about, it just sits there with no vibration at all. It’s still got the traditional British exhaust note because the firing order is the same, but without the vibes.’
Oh, there’s this: The team had no engine building experience before beginning the project and had to learn everything along the way.
– ART (Appel Richardson Twin) 360° 1200cc parallel twin. Sand cast and machined crankcases, sump, barrels & cylinder head
– Bespoke CNC machined crank shaft, cam shafts and engine covers
– Air and oil cooling
– Unique tungsten balance system. Near perfect primary and secondary balance
– Double over head cam – 8 valve head, 6 speed gearbox
– Fuel injection – Link G4+
Besides the CNC parts and the extraordinary engine, there’s a long list of the best components from Ohlins, Brembo, etc. and it all comes together in a beautiful motorcycle that reflects the care, attention and skill of everyone involved. Their aim is to begin low volume production and this is one motorcycle that certainly deserves commercial success.
They have a series of videos explaining several parts of the design and build process and their website has a lot more than I can go into here.
Check it out: Engrich Motorcycle
Thanks for the tip, Mathieu.