The H2 is designed to provide a rugged durable platform for those that desire to put a Hayabusa engine in a car type application. It has a billet case and sump, flywheel for mounting a clutch and rear drive take off, 60 amp alternator, 4 stage dry sump and starter. Rear adapter plates are planned for popular gearboxes. The engine is estimated to have a fully dressed weight of 140lbs and can produce 175 to 250 hp NA; and much more in turbo form.
The H2 BUSA engine is offered as a kit or complete engine. The base kit utilizes the Hayabusa crankshaft by using a special adapter for mounting the flywheel. A Stoker kit is offered with bespoke 72mm stroke crankshaft, with larger bearing journals, H beam billet rods and related pieces to allow building a 1.6 liter engine.
See the price page for more details.
Considering the interest in buggies and auto-cross, the engine was designed with an enclosed belt drive for the alternator and oil pump. Using a single belt instead of two belts shortens the engine length by 20mm.
This picture shows the belt drive with the cover removed. The pulley drive for the oil pump and alternator can be seen. The large hole in the front cover is to allow air to circulate through the belt drive and out by the alternator aided by the alternator fan. The large hole is shrouded by the pulley's shoulder so it is effective at keeping out large debris.
The engine lower part of the case is machined from 6061-T6 solid aluminum. The primary design objectives were compact size, stiff and robust and optimize packaging for 4 wheel applications.
This view shows right side of the engine and the 4 lb flywheel (140mm clutch). The ancillaries are all placed under the intake side to aid in packaging. It also keeps them away from the heat of the exhaust and gives plenty of room for that extra large turbo which will one day find it's way to this engine.
Dyno testing proved durability and power. The engine tested is over-bored to 84mm (1.4 liter) but otherwise uses completely stock Hayabusa heads and cams. On this run it produced 195hp with a very flat torque curve, but more is available with modifications.
The engine is very smooth. The bit of vibration seen at the end of the video was due to the the engine hitting the 11,000 rpm rev. limit.