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S3-OKN: the new TM Kart engine for the Single-Speed OK-N and OK-N junior categories (FIA Karting '23 approved)
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S3-OKN: THE NEW TM KART ENGINE FOR THE SINGLE-SPEED OK-N AND OK-N JUNIOR CATEGORIES (FIA KARTING '23 APPROVED)
HOMOLOGATION
The engine was designed and built by TM Kart for the FIA Karting Direct Drive, OK-N, and OK-N Junior categories. Its international homologation (which you can find here) is valid for 6 years and guarantees owners participation in all types of events that adopt CIK-FIA regulations. There is only one engine, designed and built for the OK-N category, but by installing a special exhaust flange, a version for the Junior category of the OK-N, the OK-N Junior, can also be obtained.
TM Kart, an Italian company active in international karting for over thirty years, has built its reputation and major successes thanks to engines dedicated to the Shifter classes. At the same time, however, the manufacturer has also invested know-how and resources in the development of Direct Drive engines, such as the S3-Senior and S3-Junior models, intended for the FIA Karting OK and OKJ categories respectively (which you can read more about in "Under Review | S3: the latest evolution of TM Kart direct drive engines"), capable of achieving numerous significant results at the international level over the years, most recently the victory of the 2023 FIA Karting World Championship in OKJ. The introduction of the OK-N and OK-N Junior classes, made official by FIA Karting in September 2022 with the aim of relaunching the entry-level Direct Drive format at a national level, offered TM Kart the opportunity to capitalize on this experience by developing the new S3-OKN. The project was created to combine performance and reliability while complying with regulations, following the same construction philosophy as the reference models for international categories. Since its launch in 2023, the Italian company seems to have achieved the goal: the S3-OKN has achieved significant successes, such as the 2023 Italian ACI Karting OK-N title and second place in the first edition of the 2024 OK-N FIA Karting World Cup, held at the PFI Circuit in the United Kingdom.
Welcomed to the new TM Kart headquarters in Pesaro (Italy), we had the opportunity to closely analyze all the technical details of this engine and verify how, behind an apparent construction simplicity, there is a careful and detailed design process.
Officially introduced by FIA Karting in 2022, the OK-N and OK-N Junior classes...
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The TM Kart S3-OKN engine shares its casting blanks with the higher-category S3-Senior and S3-Junior models (intended for the FIA Karting Direct Drive OK and OKJ categories, respectively), avoiding the complete redesign of each individual component and maintaining consistency with the philosophy of the FIA Karting regulations for the OK-N category. The casting blanks - crankcase, covers, cylinder, and head - therefore remain common across the OK and OK-N categories, including the respective Junior versions, although they undergo different mechanical processing and assembly processes based on their intended use. Each blank is made to TM Kart specifications by selected external suppliers using a gravity shell molding process. This production method, thanks to the use of high-quality refractory cores, allows for thin walls and tight tolerances, with a high-quality surface finish right from the casting stage, even on complex geometries such as those of the components of a 2-stroke racing kart engine. Inside the TM Kart plant, located in Pesaro, Italy, approximately 280 km from Rome, each incoming raw component is machined using state-of-the-art five-axis CNC centers, capable of performing multiple operations without repositioning, thus reducing geometric inaccuracies and cycle times.
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