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Blog Posts (63)

  • Why outboard engine manufacturers use roller bearings vs. friction bearings?

    Outboard engine manufacturers often use roller bearings instead of friction bearings (such as plain bearings or bushings) in 2-stroke engines for several reasons: Load Handling Capability: Roller bearings, particularly needle roller bearings, can handle higher radial and axial loads compared to friction bearings. This is important in outboard engines where the crankshaft experiences varying and sometimes significant loads due to the nature of marine propulsion. Durability and Reliability: Roller bearings are generally more durable and have a longer service life than friction bearings. They are designed to withstand higher stresses and provide consistent performance over extended periods, which is crucial for the reliability of outboard engines operating in harsh marine environments. Reduced Friction and Heat Generation: Roller bearings typically exhibit lower friction compared to friction bearings, which reduces energy loss and heat generation. In a 2-stroke outboard engine, minimizing friction helps optimize fuel efficiency and overall performance. Compact Design: Roller bearings can often be designed to have a more compact profile compared to friction bearings of similar load capacity. This compactness is beneficial for packaging within the constrained spaces of outboard engines. Maintenance Considerations: Roller bearings generally require less maintenance compared to friction bearings. They are less susceptible to wear and typically do not require lubrication or replacement as frequently, reducing downtime and maintenance costs for outboard engine operators. Industry Standard: Roller bearings have become a standard choice in modern outboard engine designs due to their proven performance and reliability. They are well-suited to handle the operational demands and stresses encountered in marine applications. Overall, the use of roller bearings in 2-stroke outboard engines is driven by their superior load handling capabilities, durability, reduced friction, and suitability for marine environments. These factors collectively contribute to improved performance, efficiency, and reliability of outboard engines. *Picture here is the original patent for the Upper Main Bearing found in the Mercury 2.4 Liter 2-Stroke V6 Outboards with 1 3/8" top journal on the crank. AKA the OEM part number 93496, 31-93496T or RBC TJ-75117-11 filed under Patent 3382016 " Arrangement of tandem rollers in a roller bearing and method of assembling same". This bearing was designed to handle 8,500 RPMs and was selected for the motor based on: Load Distribution: Tandem roller bearings are designed to handle heavy radial and axial loads simultaneously. They distribute the load across a larger surface area compared to single-row bearings, which can improve bearing life and performance. High Load Capacity: They are capable of supporting higher radial and axial loads, making them suitable for applications where significant forces are acting in multiple directions. Reliability: These bearings have been used for many years in various industrial applications, indicating their reliability and established performance in demanding conditions.

  • Effects of Water Ingress on Mercury 2-Stroke Outboard Voltage Regulator, Rectifiers, and Stators

    Water ingress into the electrical connections of a Mercury 2-stroke outboard engine can have detrimental effects on the voltage regulator, rectifiers, and stators. The exposure to water can lead to various issues that can impact the performance and reliability of these components. 1. Corrosion:  One of the primary effects of water ingress on electrical connections is corrosion. When water comes into contact with metal components within the electrical system, it can cause oxidation and corrosion to occur. This corrosion can weaken the connections, leading to poor conductivity and potential failure of the components. 2. Short Circuits:  Water ingress can also result in short circuits within the electrical system. When water bridges the gap between two conductive elements, it creates a path for current to flow outside of its intended circuit. This can cause damage to sensitive electronic components like voltage regulators, rectifiers, and stators. 3. Insulation Damage:  Water entering electrical connections can compromise the insulation surrounding wires and components. Insulation damage increases the risk of short circuits, arcing, and electrical fires. It can also lead to erratic behavior in the electrical system, affecting the overall performance of the outboard engine. 4. Reduced Efficiency:  Water ingress can disrupt the normal functioning of voltage regulators, rectifiers, and stators. This disruption can lead to a decrease in efficiency in regulating voltage output and converting AC power to DC power. As a result, the outboard engine may experience power fluctuations or fail to operate at optimal levels. 5. Component Failure:  Prolonged exposure to water ingress can ultimately cause component failure in the voltage regulator, rectifiers, and stators. The increased risk of corrosion, short circuits, insulation damage, and reduced efficiency all contribute to a higher likelihood of component failure over time. In conclusion, water ingress on electrical connections in Mercury 2-stroke outboard engines can have severe consequences on critical components such as voltage regulators, rectifiers, and stators. It is essential to prevent water from entering these connections through proper maintenance practices and protective measures to ensure the longevity and performance of the outboard engine’s electrical system. The most common part to blow? The 20 AMP Voltage Regulators on 40 AMP Ignition Systems.

  • Mercury WH Race Carb Jetting

    Here are the standard Factory Carb Jet Sizes for Mercury Racing 2.4 Liter Bridgeport, 2.4 Liter MOD VP, and 2.0 Liter XR2. This Jetting Chart includes the Mains and Idles that were found in the WH46 and WH48 Carburetors.

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