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Tkart magazine

Under Review | KZ10C, THE TM ENGINE MULTIPLE WORLD TITLE HOLDER

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TM KZ10C REVEALED

21 January 2016
2T

TYPE
Like most kart engines on the market, the KZ10c is a 2-S. 4-stroke engines are still a small niche.

125 cc

DISPLACEMENT
125 cc has been the standard for some time now, while in the past it used to be 100 cc

PUSH

START
Push-mode as in all KZ engines, with hand-release clutch and neutral to 2nd gear shifting

GEARBOX

TRANSMISSION
The KZ10C belongs to the gearbox “family” of karting engines.
It has a 6 gear manual transmission.

KZ

HOMOLOGATION
Certified under KZ homologation, valid for the next 9 years, beginning in 2016

The new KZ10C has retained several features of the KZ10B that won the 2015 World title, but there are some key differences. According to the philosophy: stay with what works, but always work to improve

The KZ shifter class is the highest-performance category in international karting today and sort of the “elite class” of our sport. True, original go-karts were non-shifter vehicles and many think non-shifter karting should continue to be the point of entry into competitive racing.

This said, it’s beyond argument that KZ engines reach impressive performance levels with accelerations that, in the right gear and at maximum torque, literally nail the driver to the seat.
And while this is true of all KZ engines, the TM KZ10B by TM Racing that won the 2015 Le Mans World Championship with Dutch driver Jorrit Pex is considered the standard of reference.
Here is what has changed with the KZ10C: tilt angle of the crankcase and cylinder, which includes the reed valve pack; shape and structure of the cylinder head; transfer ducts; fuel intake chambers; reed valve pack attachment; clucth and exhaust cover.
A good way to do an in-depth analysis of these various innovations is to follow the flow of the fuel/air blend. Starting from the reed valve pack, we notice two additional screws that help keep all pack components together (conveyor, reed-bearing structure, gaskets) even when the pack is removed from the engine.

The fact that not much has changed in terms of technical regulations over the past few homologation sessions has helped the KZ class grow in numbers and prestige. And this helps explain why the newly homologated KZ by TM Racing, the TM KZ10C, represents an evolution of its world-winning predecessor, but not a total revolution. After all, there’s no point in quitting what works!
Moving on to the crankcase , there has been a visible increase in foot height to allow for Greater air flow to the front of the crankcase and, most importantly, to accomodate for the new carburetor position.
In fact, the angle between the cylinder and the reed pack has been increased by two degrees compared to the KZ10B, to optimize fuel bend flow from carb to cylinder. The path is now straighter and simpler and this helps the crankcase chamber fill up more effectively and improves overall efficiency.

Following the flow, we get to the crankshaft’s intake chambers, the cavities that fill with fuel blend and push it through the transfer ducts and into the combustion chamber. These too have been modified to make the engine more reactive on the low end.
The transfer ducts of the KZ10C are also shaped differently: lateral ducts come with a wider connector that creates a broader curve as it joins to the cylinder liner, while the main duct is smaller and shaped to yield more thrust at low and mid power ranges. The central duct (T) has a slightly wider corss-section.

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