HYPERFORMANCE has completed building a 222ci V-twin motor, which will be used to power a street legal Pro-Street bike in Thailand.

The motor, built for Mario Kleff, is said to produce 290hp / 300lbs torque.

The Street Pro Motor, the fourth built by the company, is based on a set of Duex crank cases which have been machined by Hyperformance to make them suitable for the large capacity of the engine, which runs 5-5⁄16in bore and 5in stroke. The bottom end held in the cases was manufactured by Paul Matyka of Riverside Cycle and features double tapered Timken bearings for the crank and CNC machined billet steel conrods.

The pistons from Ross carry rings by Hastings and are in cylinders from Hyperformance. These are topped off with R&R Cycle Pro Racing heads, which have been modified by Hyperformance. In order for the motor to be used on the street, the heads have had extra fins welded and bolted on to provide cooling. Inside the heads, Jessel automotive rocker arms are controlled by an Andrews cam and custom 14in pushrods from Smith Brothers, and act on Ferrea valves and springs. The intake ports are 2.45in and the exhaust 2in.

Fuel is fed to the engine via a pair of S&S Super D carbs with 2.15in venture and there is a nitrous system installed too.

To deal with the power output of the engine Hyperformance machined a special pair of cradle plates that secure the Baker five-speed Torquebox to the motor, with shifting via a Pingel electric shifter. Power transfer is taken care of by a 5in Karata open belt drive, matched to a 13-plate clutch.

Additional detailing on the engine package includes a 1.9Kw Tech Cycle starter, two compression releases on each cylinder and a three-stage nitrous oxide system.

HYPERFORMANCE
Pleasant Hill, Iowa, USA
Tel: 515 266 6381
Fax: 515 263 8006
E-mail: info@kingofcubes.com
www.kingofcubes.com