Performance Engines


Autospeed Engineering has a long history with building and servicing race engines. Whilst the LS engine is a popular New Zealand racing choice (and one of our specialties) we work with a broad selection of racing applications, from speedway to offroad. We can service and maintain your existing engine or work with you to custom build the race engine of your dreams. All engines are dyno tuned on the Superflow 902 for validation, ensuring the complete #designbuildtune package. All our engines are assembled in our airconditioned build room where the temperature is maintained at an optimum 20 degrees.  All engines are built to specifications and we maintain a strict engine build sheet data policy. Quality checks are performed regularly during the course of your project.

Well established supplier relationships with some of the industry's elite means  we supply proven and reliable parts that are results driven.

Cylinder head work is one of our specialties. With state of the art equipment, such as the Newen Contour BB we provide CNC valve seat cutting and airflow testing with the Superflow1020 Flowbench. Spring testing and expert cylinder head assembly are all part of the process.

Cylinder head porting is also available, where we modify the inlet and exhaust ports to improve quantity and quality of airflow.  Porting the heads provides the finely detailed attention required to bring your engine to the highest level of efficiency. More than any other single factor, the porting process is responsible for the high power output of modern engines.

Porting can apply to a standard racing engine to optimise its power output as well as to a production engine to turn it into a racing engine, to enhance its power output for daily use or to alter its power output characteristics to suit a particular application.

Daily human experience with air gives the impression that air is light and nearly non-existent as we move slowly through it. However, an engine running at high speed experiences a totally different substance. In that context, air can be thought of as thick, sticky, elastic, gooey and heavy. Pumping it is a major problem for engines running at speed so head porting helps to alleviate this.