A performance aftermarket component designed for specific General Motors LS series engines, the part in question directly influences the amount of airflow entering the engine. The “92mm” denotes its bore diameter, a measurement indicative of its potential to increase air intake relative to smaller factory-equipped or other aftermarket alternatives. As an example, installing this larger diameter component may be considered when engine modifications have increased its overall air demand.
The potential benefits of a larger airflow capacity include improved engine response and increased horsepower, particularly at higher RPMs. This modification is typically pursued to maximize gains from other performance upgrades, such as aftermarket camshafts, cylinder heads, and exhaust systems. Historically, increasing intake airflow has been a common method for enhancing engine performance, with larger diameter units representing one evolution in this pursuit.
The subsequent sections will delve into compatibility considerations, installation procedures, performance expectations, and potential drawbacks associated with upgrading to such a component on an LS series engine. Further discussion will cover tuning requirements, long-term reliability, and maintenance best practices.
1. Increased Airflow
The pursuit of greater engine output invariably leads to the topic of airflow. A central constraint on an engine’s power production lies in its ability to ingest air. The component often cited alongside improvements in airflow in LS engines is a 92mm unit. Understanding the nuances of how a larger bore influences airflow is critical for informed decision-making when modifying these engines.
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Volumetric Efficiency Enhancement
Volumetric efficiency describes how effectively an engine fills its cylinders with air during each intake stroke. A restriction in the intake path, such as a smaller bore diameter, limits volumetric efficiency. By increasing the bore to 92mm, the engine encounters less resistance, potentially drawing in a greater volume of air per cycle. Consider a scenario where an engine, previously limited by its smaller intake, now exhibits improved throttle response and power output as the larger diameter facilitates increased airflow.
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Peak Power Shift
The impact of increased airflow often manifests most noticeably at higher engine speeds. A smaller bore may become a bottleneck as RPMs climb, preventing the engine from reaching its full potential. A 92mm unit can alleviate this restriction, shifting the peak power output to higher RPMs. This can be observed in dyno tests, where an engine equipped with this unit may exhibit a flatter power curve at higher RPMs compared to the same engine with a smaller intake. In practical terms, this translates to sustained power delivery throughout the upper end of the engine’s operating range.
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Supporting Modifications Requirement
Simply bolting on a larger bore part without addressing other components can yield disappointing results. Increased airflow necessitates matching upgrades to the intake manifold, cylinder heads, and exhaust system. Failure to do so can create a new bottleneck elsewhere in the system, negating the potential benefits. A holistic approach to engine modification is required. This involves carefully selecting components that complement each other and are properly tuned to maximize performance gains, this avoids choking or other forms of power losses during its operation.
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Potential for Velocity Reduction
While a larger bore increases the volume of air that can enter, it can potentially reduce the velocity of that air at lower engine speeds. Slower air velocity can negatively impact throttle response and low-end torque. Careful consideration must be given to the engine’s intended operating range. If the primary goal is maximizing peak horsepower, the trade-off in low-end torque may be acceptable. However, for street applications where responsiveness is paramount, other factors may outweigh a 92mm bore.
The relationship between increased airflow and a 92mm unit is complex, involving trade-offs and requiring a systems-based approach. A larger bore represents only one piece of the puzzle. Careful consideration of engine characteristics, supporting modifications, and intended use is critical for realizing the potential benefits of the unit.
2. Engine Compatibility
The allure of increased power often tempts enthusiasts to modify their engines. A popular upgrade involves incorporating a 92mm unit. However, the path to enhanced performance is fraught with peril if engine compatibility is overlooked. The specific LS engine variant dictates whether this component can function effectively, or whether it becomes an expensive impediment.
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Intake Manifold Flange Matching
The intake manifold serves as the bridge between the unit and the cylinder heads. For the 92mm upgrade, the intake manifold flange must accommodate its larger opening. A mismatch results in either an inability to physically mount the unit or, worse, a turbulent airflow pattern that negates any potential performance gains. Imagine the disappointment of an engine builder who, after carefully assembling a high-performance engine, discovers that the new unit cannot be properly bolted to the existing intake manifold, requiring an entirely new manifold purchase and delaying the project.
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Throttle Body Bolt Pattern and Sensor Compatibility
Different LS engine variants employ varying throttle body bolt patterns. The 92mm unit must align with the bolt pattern of the target engine. Furthermore, the electronic sensors that control the throttle’s operation must be compatible. Using incorrect sensor inputs or non standard bolt patterns leads to errors, poor performance, or even engine damage. Picture a scenario where the unit is successfully mounted, but the throttle position sensor is incompatible. The engine computer receives incorrect information, causing erratic idling, stumbling acceleration, and a cascade of diagnostic trouble codes.
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Clearance and Fitment within Engine Bay
The dimensions of the 92mm unit can pose challenges within the confines of the engine bay. Clearance issues may arise with the hood, accessory drive components, or other engine bay peripherals. Forced fitment jeopardizes other components. Consider a classic car restomod where a modern LS engine is swapped in. The larger unit may interfere with the hood, requiring modifications to the hood structure or a compromise in performance through the selection of a smaller unit.
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Electronic Control Unit (ECU) Support and Tuning
Even if the component physically fits and the sensors are compatible, the engine’s ECU must be capable of accommodating the increased airflow. Older ECUs may lack the processing power or programming to properly manage the larger volume of air, leading to lean or rich fuel mixtures and suboptimal performance. Sophisticated tuning is often required to recalibrate the ECU for the new component. A tuner grappling with an outdated ECU attempting to manage the increased airflow faces a daunting task. Without adequate tuning capabilities, the engine runs erratically, potentially damaging itself and never unlocking the promised horsepower gains.
Engine compatibility extends beyond simple physical dimensions. It encompasses sensor compatibility, ECU support, and sufficient clearance within the engine bay. The installation of a 92mm unit demands careful assessment of these factors to avoid costly mistakes and ensure that the modification unlocks its full performance potential. It is often more complex than just bolting one part to another. A deep understanding of the engine and its control systems is key.
3. Tuning Requirements
The installation of a 92mm unit on an LS engine marks a pivotal moment. The modification isn’t simply bolting on a larger part; it necessitates a fundamental recalibration of the engine’s control systems. Without precise tuning, the potential gains of the larger unit remain untapped, and the engine may suffer from compromised performance or even damage. The following discussion delves into the critical tuning considerations that accompany this upgrade.
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Air-Fuel Ratio (AFR) Adjustment
A 92mm unit allows a significantly greater volume of air to enter the engine. The ECU must compensate by injecting a corresponding amount of fuel to maintain the optimal air-fuel ratio. Failure to do so results in a lean condition, where the engine runs with insufficient fuel. Lean conditions can cause detonation, overheating, and ultimately, engine failure. The story of the amateur tuner who installed the larger unit but neglected to adjust the fuel maps serves as a cautionary tale. His engine, subjected to prolonged lean conditions, suffered catastrophic piston damage within a matter of weeks, a stark reminder of the importance of proper AFR adjustment.
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Idle Air Control (IAC) Calibration
The IAC valve regulates the amount of air that bypasses the throttle plate at idle. With a larger unit, the engine receives more air even when the throttle is closed, potentially causing an excessively high idle speed. The ECU must be recalibrated to properly control the IAC valve, ensuring a stable and appropriate idle. Tales abound of engines with 92mm units that idle erratically, surging up and down as the ECU struggles to maintain control. A skilled tuner can alleviate these issues by meticulously adjusting the IAC settings, restoring smooth and predictable idle behavior.
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Volumetric Efficiency (VE) Table Refinement
The VE table is a crucial component of the ECU’s programming. It maps the engine’s airflow characteristics across various RPM and manifold pressure ranges. Installing a 92mm unit fundamentally alters the engine’s VE. The existing VE table becomes inaccurate, leading to incorrect fuel calculations. Tuning involves carefully refining the VE table to reflect the new airflow dynamics. A seasoned tuner uses data from wideband oxygen sensors and dyno runs to painstakingly adjust the VE table, ensuring that the engine receives the correct amount of fuel under all operating conditions. This often involves hundreds of data points and hours of meticulous refinement.
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Spark Timing Optimization
The larger airflow associated with the 92mm unit can affect the engine’s susceptibility to knock. Knock, or detonation, is a destructive form of abnormal combustion that can damage engine components. Tuning involves carefully optimizing the spark timing to prevent knock while maximizing power output. Retarding the timing reduces the risk of knock but also decreases power. The tuner must strike a delicate balance, using knock sensors and data logging to identify and eliminate any instances of knock while pushing the timing as far as possible without compromising engine safety. The result is an engine that produces maximum power with optimal reliability.
The tuning requirements associated with a 92mm unit are not trivial. They demand specialized knowledge, precision equipment, and a deep understanding of engine management systems. Neglecting these tuning considerations transforms a potentially beneficial modification into a recipe for disaster. The stories of engines damaged or underperforming due to improper tuning serve as a constant reminder of the crucial role that tuning plays in realizing the full potential of the larger bore diameter.
4. Installation Complexity
The allure of increased horsepower often overshadows a critical aspect of performance modifications: the inherent complexity of installation. A 92mm unit for an LS engine, while promising enhanced airflow and power gains, presents a significant undertaking, particularly for those unfamiliar with intricate engine mechanics. The physical act of bolting the new unit onto the engine represents only the initial step in a more elaborate process, one riddled with potential pitfalls for the unwary. The complexities stem from the need for precise alignment, sensor compatibility, and the often-overlooked necessity of accompanying modifications. One hears stories of enthusiasts spending countless hours wrestling with ill-fitting components, struggling to adapt existing wiring harnesses, or facing unexpected clearance issues within the engine bay. These anecdotes underscore a fundamental truth: the successful integration of a 92mm unit demands more than just basic mechanical skills; it requires a meticulous approach, a deep understanding of the engine’s architecture, and a willingness to confront unforeseen challenges.
Consider, for instance, the scenario of an experienced mechanic attempting to install a 92mm unit on a late-model LS3 engine. Despite years of experience, the mechanic encounters difficulties when attempting to adapt the factory throttle cable to the new unit’s linkage. The cable, designed for a smaller unit, lacks the necessary length and requires modification or replacement. Furthermore, the intake manifold, while compatible with the LS3 engine family, exhibits slight variations in its mounting flange, necessitating the use of shims to achieve proper alignment. These seemingly minor obstacles can quickly escalate into time-consuming delays, highlighting the importance of thorough pre-installation research and careful planning. The installation’s complexity is further compounded by the need for specialized tools, such as torque wrenches and diagnostic scanners, which are essential for ensuring proper component seating and identifying potential sensor malfunctions. The mechanic’s experience serves as a practical illustration of the multifaceted nature of the task, demonstrating that even seasoned professionals can encounter unexpected hurdles when installing a 92mm unit.
Ultimately, the successful installation of a 92mm unit hinges on a comprehensive understanding of its inherent complexities. It demands careful preparation, meticulous execution, and a willingness to adapt to unforeseen challenges. The stories of frustrated enthusiasts and seasoned mechanics alike underscore the importance of recognizing that this modification represents more than just a simple bolt-on upgrade; it is a complex undertaking that requires patience, expertise, and a realistic assessment of one’s own capabilities. The allure of increased horsepower must be tempered by a clear understanding of the labor, expertise, and potential pitfalls involved in achieving that goal. Only then can the true benefits of the 92mm unit be realized.
5. Performance Gains
The narrative of performance gains tied to a 92mm unit for LS engines often begins with a singular ambition: to extract more power. This ambition, however, is not always met with the expected results. The larger bore itself is not a guarantee of increased horsepower; it is a facilitator, a gateway to a greater volume of air entering the engine. Consider the case of a seasoned drag racer, a man who dedicated years to perfecting his naturally aspirated LS engine. He installed a 92mm unit, anticipating a significant increase in his quarter-mile times. The initial dyno results were underwhelming. The engine, while breathing more freely, lacked the supporting modifications to fully capitalize on the increased airflow. The racer discovered that the factory cylinder heads were now a bottleneck, restricting the potential of the larger bore diameter. He invested in aftermarket heads, a more aggressive camshaft, and a custom tune. The subsequent dyno results were dramatic, revealing a substantial increase in both horsepower and torque across the RPM range. This racer’s experience underscores a crucial point: a 92mm unit’s true potential is unlocked only when coupled with complementary upgrades that address other potential restrictions within the engine.
The performance gains associated with this unit extend beyond peak horsepower figures. The increased airflow often translates to improved throttle response, providing a more immediate and engaging driving experience. This is particularly noticeable in applications where the engine operates frequently at partial throttle, such as street driving or road racing. A driver piloting a modified LS-powered sports car on a winding mountain road might experience a more direct connection to the engine, with quicker acceleration and improved control. Furthermore, the larger bore diameter can shift the engine’s powerband, increasing power at higher RPMs. This can be advantageous in applications where sustained high-speed operation is common, such as motorsports or highway driving. However, the increased airflow also presents challenges. Maintaining proper air-fuel ratios becomes even more critical, requiring precise tuning to avoid lean or rich conditions that can compromise engine performance and reliability. The increased airflow can also exacerbate pre-existing issues, such as vacuum leaks or sensor malfunctions, requiring careful attention to detail during installation and troubleshooting.
In conclusion, the relationship between performance gains and this 92mm unit is not a simple equation. It is a complex interplay of factors, involving not only the unit itself but also the engine’s overall configuration, the quality of the tuning, and the driver’s ability to effectively utilize the increased power. While the potential for significant performance improvements exists, realizing those gains requires a holistic approach, a willingness to invest in supporting modifications, and a commitment to proper tuning and maintenance. The narrative of the 92mm unit and its impact on performance is not merely a story of larger bore diameters and increased airflow; it is a testament to the importance of understanding the intricate workings of the internal combustion engine and the delicate balance required to unlock its full potential.
6. Reliability Concerns
The pursuit of heightened performance often leads to modifications that, while enhancing certain aspects of an engine’s capabilities, may concurrently introduce potential avenues for decreased reliability. The installation of a 92mm unit on an LS engine is one such modification, a decision that warrants careful consideration of potential long-term impacts on engine longevity and overall system integrity. The larger bore, while permitting increased airflow, can place additional stress on various engine components, leading to premature wear or even catastrophic failure if not properly addressed.
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Throttle Actuator Fatigue
The electronic throttle actuator, responsible for controlling the throttle plate’s position, is subjected to increased strain with a 92mm unit. The larger surface area of the throttle plate creates greater resistance against the actuator, requiring it to work harder to maintain precise control. A seasoned mechanic, tasked with diagnosing a recurring issue on an LS-powered vehicle equipped with the unit, discovered that the throttle actuator was failing prematurely. The increased load had caused internal components to wear excessively, resulting in erratic throttle response and eventual actuator failure. This highlights the importance of selecting a high-quality, robust actuator capable of withstanding the demands of the larger unit.
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Increased Vacuum Leaks
The larger bore diameter and potentially altered intake manifold configuration associated with a 92mm unit can increase the risk of vacuum leaks. These leaks, often subtle and difficult to detect, can disrupt the engine’s air-fuel ratio, leading to poor performance, rough idling, and potential engine damage. A meticulous engine builder, painstakingly assembling a high-performance LS engine, encountered a persistent issue with erratic idle. After hours of troubleshooting, he discovered a small vacuum leak at the intake manifold gasket, a consequence of the altered sealing surface created by the 92mm unit’s installation. This underscores the need for meticulous attention to detail during installation, ensuring proper sealing and leak-free operation.
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Sensor Malfunctions
The increased airflow and altered engine dynamics resulting from a 92mm unit can sometimes lead to sensor malfunctions. The Mass Air Flow (MAF) sensor, responsible for measuring the amount of air entering the engine, may struggle to accurately interpret the increased airflow, leading to incorrect fuel calculations and potential engine issues. An experienced tuner, calibrating an LS engine equipped with the unit, observed inconsistencies in the MAF sensor readings. The sensor, overwhelmed by the increased airflow, was providing inaccurate data to the ECU, causing the engine to run lean. The tuner addressed this issue by recalibrating the MAF sensor scaling and, in some cases, upgrading to a larger MAF sensor capable of accurately measuring the increased airflow.
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Driveability Compromises
While a 92mm unit can enhance peak horsepower, it can also introduce driveability compromises, particularly at lower engine speeds. The larger bore diameter can reduce air velocity at low RPMs, leading to sluggish throttle response and a loss of low-end torque. A street car enthusiast, eager to improve his LS-powered vehicle’s performance, installed a 92mm unit without considering its impact on low-end driveability. He soon discovered that the engine felt less responsive at low speeds, making it less enjoyable to drive in everyday traffic. This highlights the importance of carefully considering the engine’s intended use and the potential trade-offs associated with the 92mm unit.
The reliability concerns associated with a 92mm unit are multifaceted, encompassing issues ranging from component fatigue to sensor malfunctions. The decision to install this component should not be taken lightly, requiring a thorough assessment of potential risks and a commitment to addressing these concerns through careful installation, proper tuning, and the selection of high-quality components. The pursuit of increased performance must be tempered by a pragmatic understanding of the potential consequences, ensuring that the quest for power does not compromise the engine’s long-term reliability and overall driveability.
Frequently Asked Questions
The installation of a 92mm unit on an LS engine often raises a series of questions. This section addresses common concerns, drawing upon real-world experiences to provide clarity.
Question 1: Does a larger bore always equate to more horsepower?
The assumption that a larger bore automatically translates to greater power is a common misconception. Picture a skilled mechanic, eagerly anticipating a performance boost after installing this unit. Dyno testing revealed minimal gains. The engine, despite increased airflow capacity, remained choked by the stock cylinder heads. Only after upgrading these did the true potential of the unit become apparent. The lesson: the part is a facilitator, not a miracle cure. Other limitations in the system must be addressed.
Question 2: Is this upgrade suitable for a daily-driven vehicle?
The suitability of this upgrade for daily driving hinges on several factors. Consider the case of a daily commuter who installed a 92mm unit seeking improved throttle response. While peak power increased, low-end torque suffered. The car became less responsive at lower RPMs, hindering drivability in everyday traffic. The moral: The modification often shifts the power band, which may be acceptable for weekend racers but detrimental for daily drivers.
Question 3: What are the tuning requirements? Can the stock ECU handle the increased airflow?
Proper tuning is non-negotiable. Envision an engine builder bypassing ECU recalibration after installing a larger unit. The engine ran lean, resulting in detonation and catastrophic piston damage. The factory ECU may lack the capacity to manage the altered airflow effectively. Custom tuning, or a standalone ECU, is typically essential for optimizing performance and ensuring engine safety.
Question 4: Are there specific LS engine variants that are better suited for this upgrade?
Compatibility varies across LS engine families. A seasoned engine swapper learned this the hard way after attempting to install a unit on an early LS1 engine. The intake manifold flange did not match, rendering the unit incompatible without significant modifications. Later LS2, LS3, and LS7 engines often provide better compatibility, but careful research is always necessary.
Question 5: Will this modification affect fuel economy?
Fuel economy is often compromised. A performance enthusiast, after installing the part, noticed a significant decrease in fuel mileage. While improved performance is achievable, the increased airflow and potentially richer fuel mixtures contribute to greater fuel consumption. Expect a trade-off between power and efficiency.
Question 6: What is the typical lifespan of an electronic throttle actuator on a 92mm unit?
The lifespan of the throttle actuator can be affected. A mechanic specializing in LS engines observed premature actuator failures on vehicles equipped with larger throttle bodies. The increased strain on the actuator, due to the larger throttle plate, can accelerate wear. Regular inspection and replacement with a high-quality unit are crucial.
The installation of a 92mm unit requires careful consideration of its impact on various engine parameters. It is not a universal solution and necessitates a holistic approach to engine modification.
The next section will explore common installation challenges.
Essential Tips for 92mm Throttle Body LS Integration
The integration of a 92mm unit into an LS engine is not merely a mechanical exercise; it is a strategic undertaking fraught with potential pitfalls. The following tips are gleaned from years of hard-won experience, representing practical lessons learned through trial and error.
Tip 1: Conduct Thorough Research. The compatibility of a 92mm unit with a given LS engine extends beyond physical dimensions. The tale of the novice mechanic who neglected to verify sensor compatibility serves as a grim reminder. Despite successful installation, the mismatched throttle position sensor led to erratic engine behavior and eventual component failure. Prior to purchase, meticulously verify compatibility with the specific LS engine variant, including bolt patterns, sensor compatibility, and electronic control unit (ECU) support.
Tip 2: Invest in Quality Components. The allure of cost savings can prove deceptive. Consider the engine builder who opted for a budget-friendly unit. The inferior throttle plate mechanism failed within months, negating any initial savings and necessitating a costly replacement. Prioritize quality over price. A reputable brand offers not only enhanced performance but also improved reliability and longevity.
Tip 3: Prioritize Professional Tuning. The temptation to self-tune can be alluring, but ill-advised. A performance enthusiast, confident in his abilities, attempted to recalibrate the ECU after installing a larger unit. His efforts resulted in a lean condition, leading to detonation and irreversible engine damage. Seek the expertise of a qualified tuner with experience in LS engines and this upgrade. Precise calibration is essential for maximizing performance and safeguarding engine health.
Tip 4: Address Supporting Modifications. A 92mm unit is not a standalone solution; it is a component within a larger system. Picture a drag racer who installed the unit expecting immediate gains. The stock cylinder heads became a bottleneck, negating the benefits of increased airflow. Complement the installation with matching upgrades, such as improved cylinder heads, a performance camshaft, and a high-flow exhaust system. A holistic approach is paramount.
Tip 5: Implement a Rigorous Break-In Procedure. Treat the modified engine with care during the initial break-in period. A seasoned mechanic, after installing a unit on a freshly built LS engine, adhered to a strict break-in protocol. This involved varying engine speeds, avoiding prolonged high RPMs, and performing regular oil changes. The engine exhibited exceptional performance and reliability, a testament to the importance of proper break-in practices.
Tip 6: Monitor Engine Parameters. Vigilance is essential for detecting potential issues. An experienced tuner installed a suite of sensors to monitor critical engine parameters after the upgrade. Early detection of a vacuum leak prevented severe engine damage. Continuously monitor air-fuel ratios, oil pressure, and coolant temperature to identify anomalies and address them promptly.
Tip 7: Perform Regular Maintenance. The modified engine demands meticulous upkeep. A dedicated owner, religiously adhering to a maintenance schedule, extended the life of his LS engine. Regular oil changes, spark plug replacements, and air filter cleaning ensured optimal performance and prolonged component life. Do not neglect routine maintenance.
The successful integration of a 92mm unit into an LS engine is a testament to meticulous planning, skilled execution, and unwavering attention to detail. By adhering to these essential tips, potential pitfalls can be avoided, and the true potential of the modification can be realized.
The article now reaches its conclusion.
The End of the Line
This exploration has traversed the landscape of the “92mm throttle body LS” upgrade, charting its potential gains and inherent complexities. From airflow dynamics to compatibility concerns, from tuning necessities to reliability pitfalls, the journey has revealed that this modification is far more than a simple bolt-on affair. It is a commitment, a demand for precision, and an acceptance of trade-offs. The increased diameter itself is merely a piece of a larger puzzle, reliant on supporting modifications and meticulous calibration to truly unlock its promised power.
The tale of the 92mm unit is not just about numbers and specifications. It is a reflection of the constant human drive to push boundaries, to extract every last ounce of performance from the internal combustion engine. Before embarking on this modification, heed the lessons learned, weigh the potential against the risks, and approach the task with knowledge and foresight. For the 92mm unit is a tool, powerful in the hands of the informed, and potentially destructive in the grasp of the unprepared. Choose wisely.
