What’s the Difference Between KING RACING STD and KING RACING STDX Bearings, and When Should You Use

What’s the Difference Between KING RACING STD and KING RACING STDX Bearings, and When Should You Use STDX?

KING RACING bearings are renowned in the world of motorsports for their exceptional performance and long-lasting durability. When choosing the right bearing for a high-performance engine, the decision often comes down to the two key options: KING RACING STD and KING RACING STDX bearings. While both are designed to handle the extreme conditions of racing engines, there are important differences between them that will influence your choice.

KING RACING STD Bearings Explained

The KING RACING STD bearings are engineered for high-performance engines that demand tight clearances. They deliver precise oil flow to ensure that both the crankshaft and the bearing surfaces receive adequate lubrication without allowing too much oil flow. This tight oil clearance is critical for maintaining stability in oil pressure and performance.

Oil clearance: The typical oil clearance for KING RACING STD bearings is 0.0254 mm (0.001 inch). This allows for sufficient lubrication between the crankshaft and the bearing, while preventing excess oil loss or pressure drop.

Application: KING RACING STD bearings are ideal for engines where tighter tolerances are required. These bearings work best in engines that do not require excessive oil flow, ensuring a snug fit between the crankshaft and the bearing for optimal performance.

What KING RACING STDX Bearings Offer

The KING RACING STDX bearings are designed with a larger internal diameter, resulting in increased oil clearance. This larger clearance allows for a thicker oil film between the crankshaft and the bearing, which is essential for high-performance engines that run at higher temperatures or face extreme stress.

Increased oil clearance: The oil clearance for STDX bearings can be as large as 0.0381 mm (0.0015 inch). This additional clearance provides more room for oil to flow, improving lubrication and cooling. This is especially important in engines operating at higher temperatures and under heavy loads.

Application: STDX bearings are recommended for engines where additional clearance is required due to crankshaft polishing or when higher temperatures generate increased heat and demand improved oil flow for optimal performance.

When to Use KING RACING STDX Bearings

STDX bearings should be selected when your engine needs a thicker oil film due to increased load or high temperature. They are also ideal when the crankshaft journals have been polished, as the larger internal diameter ensures that the proper clearance is maintained, preventing metal-to-metal contact and improving engine performance.

Example: After polishing the crankshaft journals, the reduced diameter may result in too tight a fit with standard bearings. In such cases, STDX bearings, with their larger internal diameter, provide the necessary clearance to avoid overheating and extend the life of the bearings and engine under extreme conditions.