Fatigue fracture is the most common valve spring failure mode. A spring cycling at 7,000 RPM opens and closes each valve 3,500 times per minute — that is 210,000 stress cycles per hour. Over time, micro-cracks initiate and propagate until the wire breaks.
Based in Mbombela, Mpumalanga, Mountings & Bushes is a proudly South African, family-owned company specialising in the design, manufacture, and refurbishment of polyurethane bushes, mountings, and related suspension components for a wide range of vehicles and applications.
A straight pipe is a free-flowing section of exhaust tubing designed to maximise airflow and simplify exhaust routing.
It’s commonly used for:
One of the biggest problems in modified engines is valve float.
Valve float happens when the valve spring cannot close the valve quickly enough as engine RPM increases. When this happens, the valve stops following the camshaft profile correctly.
While exact configurations may vary slightly depending on stock and specification, a typical complete kit includes:
The weekend did not begin smoothly for the Drift Farm Motorsports team. Rainy conditions during the opening practice session created difficult circumstances, limiting the team to just a single run on track. In a discipline where drivers rely heavily on seat time, consistency, and fine-tuning, losing valuable practice laps can significantly impact confidence and setup preparation.
Despite the frustrating start, the team refused to let the weather define their weekend.
Whether you’re building a responsive street car, a weekend track weapon, or an oval racing setup, the stock camshaft eventually becomes one of the engine’s biggest restrictions. This is exactly where the STK 270H Camshaft with Vernier Pulley changes the game.
Designed specifically for Opel Corsa 8-valve applications, this performance camshaft setup is engineered to improve airflow, unlock usable horsepower, and completely transform the engine’s character.
Conventional exhaust joints—like slip fits, clamps, and basic welds—were never designed for the demands of modern performance setups.
As engines produce more power, heat, and vibration, these older-style joints begin to show their limitations:
At the core of this upgrade is a 76mm high-flow design, specifically developed to improve exhaust efficiency. By eliminating the restrictive catalytic converter, exhaust gases are able to exit faster, reducing backpressure and allowing the turbo to spool more freely.
From the factory, downpipes are built with compromises. Emissions regulations and noise restrictions result in limited exhaust flow, which in turn affects turbo efficiency and overall performance.
The DP1 eliminates these restrictions.
With a full 4-inch diameter and a catless design, exhaust gases exit the turbo faster and more efficiently. This leads to:
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