Mahle

This Mahle RSR big-bore piston and cylinder set is intended for compatible Porsche 911 3.0 Carrera and 911 SC engine builds from 1976–83. Its 98mm bore works with a 70.4mm stroke to increase displacement from 3.0 litres to approximately 3.2 litres.

Fits

• Porsche 911 3.0 Carrera 1976–77
• Porsche 911 3.0L / SC 1978–83

What This Product Does

The set replaces the original pistons and cylinders during a complete engine rebuild or displacement conversion. Forged pistons are paired with Nikasil-coated ST52 steel cylinders to provide the matched running clearances required within an air-cooled flat-six engine. A 10.3:1 compression ratio and deeper valve pockets suit a correctly planned RSR-style build and provide an alternative to the established Max & Moritz configuration.

Functions

• Increases compatible 3.0L engines to approximately 3.2L
• Forms the combustion chambers and supports compression sealing
• Transfers combustion force through the connecting rods to the crankshaft
• Provides controlled piston movement and heat transfer
• Supports oil control through matched pistons, cylinders and rings

Technical Details

• Bore diameter: 98mm
• Specified stroke: 70.4mm
• Compression ratio: 10.3:1
• Forged pistons with deeper valve pockets, off-centre pin bores and 22 x 58mm wrist pins
• ST52 steel cylinders with Nikasil-coated running surfaces
• Supplied with six cylinders, pistons, fitted rings, wrist pins and retaining clips
• Approximate kit weight: 9.78kg

The off-centre piston-pin arrangement is designed to manage piston movement and operating noise. Rings are installed on the pistons before supply, helping to keep the matched assembly together during preparation. Piston rings and wrist pins must not be modified. Final measurements remain essential before assembly, including deck height, piston-to-cylinder clearance, ring condition and valve-to-piston clearance.

Symptoms of Fault

• Low or uneven compression readings
• Excessive oil consumption or blue exhaust smoke
• High crankcase pressure or pronounced blow-by
• Piston slap, knocking or other internal engine noise
• Scored, distorted or worn cylinder surfaces found during inspection
• Damaged piston crowns, skirts or ring lands
• Metallic debris discovered in the oil or filter

Why Replacement Matters

Worn pistons, rings or cylinder surfaces can prevent the combustion chamber from sealing correctly. Replacing these components as a matched set helps restore suitable clearances, compression and oil control. The engine should be inspected and measured by an experienced air-cooled Porsche engine builder, as the final specification depends on the crankshaft, camshafts, cylinder heads, induction, exhaust, fuel system and ignition settings.

FAQs

• Is this a standard-size replacement set?
  No. It uses a 98mm big bore to convert a compatible 3.0L engine to approximately 3.2L.
• Are the pistons and cylinders matched?
  Yes. The components are supplied together to maintain the intended sizing and clearances.
• What should be checked during installation?
  Confirm all critical clearances, compression requirements, cylinder-head compatibility and the complete engine specification before final assembly.
• Does the engine require a running-in period?
  Yes. Follow the engine builder's procedure for initial start-up, oil selection, ring bedding and subsequent inspection.

Related reference numbers
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10010303204

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Big Bore Piston & Cylinder Set – 3.0ltr to 3.2ltr - 98mm - 10.3:1 Compression Ratio

This Mahle 3.2ltr Piston and Cylinder Set is a high-performance big bore upgrade for the Porsche 911 3.0ltr engine, increasing bore size to 98mm and capacity to approximately 3.2 litres.

Fits:

• Porsche 911 1976-1977 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC

Designed as a replacement for the well-known Max & Moritz piston and cylinder set, the kit combines genuine Mahle forged pistons with genuine Mahle ST52 steel, Nikasil-coated cylinders and a higher 10.3:1 compression ratio.

What Does This Upgrade Do?

Increasing the bore to 98mm raises the capacity of the 3.0ltr engine to approximately 3.2ltr. The additional displacement and 10.3:1 compression ratio can improve torque, throttle response and acceleration when used as part of a correctly specified engine build.

Final power gains depend on the complete engine specification, including camshafts, crankshaft, induction, exhaust and fuel system.

Forged Mahle Pistons

Mahle forged pistons provide greater and more consistent strength than conventional cast pistons, making them particularly suitable for performance engine builds.

The pistons feature deeper mirrored valve pockets, 22mm wrist pins and an offset piston pin bore. This de-axiert design helps reduce piston noise for quieter, more factory-like operation.

Mahle Nikasil-Coated Cylinders

The genuine Mahle cylinders are manufactured from ST52 steel for high strength and thermal resistance.

Their Nikasil-coated cylinder surfaces help reduce friction and wear while providing the durable running surface required for a high-performance air-cooled Porsche engine.

Matched Mahle Pistons & Cylinders

This kit uses genuine Mahle pistons matched with genuine Mahle Nikasil-coated cylinders to maintain the correct piston-to-cylinder tolerances.

Using correctly matched components is particularly important for maintaining appropriate clearances, controlling oil consumption and achieving long-term engine reliability.

Pre-Installed Piston Rings

The sealing and oil-control rings are supplied pre-installed on the pistons, simplifying preparation for engine assembly.

Piston rings and piston pins must not be modified, as modification can affect component reliability and invalidate the manufacturer's warranty.

Performance Potential

The larger 3.2ltr capacity and 10.3:1 compression ratio provide the foundation for increased horsepower and torque.

The manufacturer reports gains of 35hp or more with an appropriately specified engine build; however, this should not be considered a guaranteed increase. Actual performance depends on camshafts, crankshaft specification, induction, exhaust, fuelling and engine tuning.

For 3.0ltr 911 SC engines originally producing approximately 180–188hp, suitable fuel-system modifications may also be required to make full use of the increased engine capacity.

Key Features

• Mahle 3.2L piston and cylinder set
• 98mm big bore
• Converts compatible 3.0ltr engines to approximately 3.2ltr
• 10.3:1 compression ratio
• Replaces Max & Moritz-style piston and cylinder set
• Genuine Mahle forged pistons
• Deeper mirrored valve pockets
• Genuine Mahle ST52 steel cylinders
• Nikasil-coated cylinder bores
• Offset piston pin bore for quieter operation
• 22mm wrist pins
• Pre-installed piston rings
• Complete matched piston and cylinder set
• Includes cylinders, pistons, rings, wrist pins and clips
• Kit weight approximately 9.78kg / 21.6lb
• Made in Germany by Mahle GmbH

Mahle 98mm Big Bore Piston & Cylinder Sets for Porsche 911 SC

The Mahle 3.2ltr, 98mm big bore piston and cylinder set provides a premium solution for Porsche 911 3.0 SC engine rebuilds and performance upgrades.

Combining increased displacement with a 10.3:1 compression ratio, forged Mahle pistons and genuine Mahle Nikasil-coated cylinders, the kit is particularly suited to performance-focused air-cooled Porsche engine builds and customers looking for a modern replacement for the Max & Moritz 3.2ltr conversion.

Professional engine assembly and measurement are recommended to confirm clearances, compression, valve-to-piston clearance and compatibility with the complete engine specification.

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10010303200

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Piston and Cylinder Set - 3.8ltr - 102mm - Slip Fit - 9.4:1

This Mahle 3.8-litre Piston and Cylinder Set is a high-performance engine upgrade for Porsche 996 turbo, 997 turbo and GT2 RS applications, combining 102mm forged alloy pistons with slip-fit ST52 steel cylinders.

Fits:

• Porsche 996 TURBO 2000-05
• Porsche 996 GT2 2001-05
• Porsche 997 MK1 TURBO 2007-09
• Porsche 997 MK1 GT2 2007-09
• Porsche 997 MKII GT2 RS 2011-13

Designed for high-performance Mezger engine builds, the kit features a 9.4:1 compression ratio, deeper mirrored valve reliefs, offset piston pin bores and pre-installed piston rings.

What Does This Upgrade Do?

The 102mm bore allows the engine to be built to approximately 3.8 litres, providing increased displacement and the potential for greater horsepower and torque when combined with the correct engine components, turbocharger specification and ECU calibration.

Forged Mahle Pistons

Mahle's forged alloy pistons provide greater and more consistent strength than conventional cast pistons, making them well suited to high-output turbocharged engines.

A proprietary anti-friction coating helps reduce friction and wear while protecting the piston and pin bore surfaces.

The pistons also feature larger, deeper mirrored valve reliefs and use 23mm wrist pins.

Offset Piston Pin Bore

The piston pin bore is offset, or de-axiert, to help reduce piston noise and maintain quieter operation similar to the factory design.

ST52 Steel Cylinders

The cylinders are manufactured from ST52 steel, providing high strength and thermal resistance for demanding turbocharged engine applications.

The cylinders use a slip-fit design, simplifying installation without requiring machining of the engine housing for the cylinder fitment.

Pre-Installed Piston Rings

The sealing and oil-control rings are supplied pre-installed on the pistons, helping simplify assembly and ensuring the correct piston and ring combination is supplied as a complete matched kit.

Performance Potential

Increasing engine displacement can provide additional torque and horsepower, but final output depends heavily on the complete engine specification.

Turbochargers, camshafts, crankshaft configuration, intake and exhaust components, fuelling and ECU calibration will all influence the final result. Builds exceeding 700hp are possible with an appropriately specified engine and software, but this figure should not be considered a guaranteed output from the piston and cylinder set alone.

Key Features

• Mahle 3.8ltr piston and cylinder set
• Suitable for Porsche 996 Turbo / 997 Turbo / GT2 RS applications
• 102mm bore
• 9.4:1 compression ratio
• Forged alloy pistons
• ST52 steel cylinders
• Slip-fit cylinder design
• 23mm wrist pins
• Larger and deeper mirrored valve reliefs
• Offset piston pin bore for quieter operation
• Anti-friction piston coating
• Pre-installed piston rings
• Designed for high-performance turbo engine builds
• Complete piston and cylinder kit
• Made in Germany by Mahle GmbH

Mahle Porsche 996 / 997 turbo & GT2 RS Piston and Cylinder Sets

Mahle performance piston and cylinder sets provide a premium solution for Porsche Mezger engine rebuilds, displacement upgrades and high-performance turbo applications.

The combination of 102mm forged pistons, 9.4:1 compression and ST52 steel slip-fit cylinders makes this 3.8L kit particularly suited to Porsche 996 Turbo, 997 Turbo and GT2 RS engine builds where increased displacement, strength and performance potential are required.

Professional engine assembly, measurement and calibration are recommended to ensure correct clearances and compatibility with the complete engine specification.

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100103038TU997

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Coolant expansion tank bottle
The MAHLE CRT 392 000S coolant expansion tank is a high-quality replacement reservoir for the Porsche Taycan’s liquid-cooling and thermal-management system. Cross-referenced to Porsche part number 9J1121407A, the unit is supplied with the reservoir cap and coolant-level sensor, providing a practical, complete replacement for a leaking, cracked or damaged original tank.

Fits:
Porsche 9J1.1 Taycan 2020 - 2024

Diagram ref no 1

The expansion tank accommodates changes in coolant volume as the thermal-management system heats and cools. It stores excess coolant from the closed circuit, helps the system manage pressure and provides a reserve supply as the coolant contracts. Maintaining the correct coolant level is essential to the stable operation of the Taycan’s temperature-control system.

Key Features and Benefits
•  MAHLE replacement cooling-system component
•  Supplied with coolant reservoir cap
•  Includes integrated coolant-level sensor
•  Direct cross-reference to Porsche 9J1121407A
•  Helps restore correct coolant containment and level monitoring
•  Designed for dependable, leak-free operation
•  Suitable for replacement of cracked, leaking or damaged tanks

Why Replacement Matters
A cracked or leaking expansion tank can cause coolant loss, prevent the system from maintaining the correct fluid level and compromise thermal-management performance. Prompt replacement helps protect the cooling circuit and supports stable temperature control for the vehicle’s electrical drivetrain systems.

When to Replace the Expansion Tank
•  Coolant is visible around the reservoir or its connections
•  The tank body is cracked, distorted or discoloured
•  A low-coolant warning remains after the coolant level is corrected
•  The integrated level sensor is faulty
•  The reservoir cap or sealing area is damaged
•  Coolant level falls repeatedly without an obvious external hose leak
•  During cooling-system repair or accident-damage restoration

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9J1121407A

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DAMAGED RIGHT Radiator For Water Coolant Fluid.
This is a damaged in transit part, offered for parts or refurbishment purposes only. Ideal for restoration specialists, collectors, or workshops looking for components at reduced cost.

NOTE: For spares, repair, or core replacement only.

Condition: 
This RIGHT Radiator For Water Coolant Fluid is brand new and never been fitted. It has some transport damage which is repairable.
Please see the gallery of images before purchasing.

Fits:

• Porsche Boxster 986 2.5L 1997-99
• Porsche Boxster 986 2.7L 1999-02
• Porsche Boxster S 986 3.2L 1999-02
• Porsche Boxster 986 2.7L 2003-04
• Porsche Boxster S 986 3.2L 2003-04
• Porsche 996 C2 3.4L 1997-08/01
• Porsche 996 C4 3.4L 1997-08/01
• Porsche 996 C2 3.6L 09/01-2005
• Porsche 996 C4 3.6L 09/01-2005
• Porsche 996 GT3 MKI 1999-02
• Porsche 996 GT3 MKII 2003>>
• Porsche 996 GT3 RS 2003-04  

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99610613251

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DAMAGED Gearbox Oil Cooler.
This is a damaged in transit part and has a visible dent, offered for parts or refurbishment purposes only. Ideal for restoration specialists, collectors, or workshops looking for components at reduced cost.

NOTE: For spares, repair, or core replacement only.

Condition: 
This Gearbox Oil Cooler is brand new and never been fitted. It has some transport damage which is repairable.
Please see the gallery of images before purchasing.

Fits:

• Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
• Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
• Porsche 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010-17
• Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
• Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
• Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
• Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17  

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95831701902

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DAMAGED Gearbox Oil Cooler.
This is a damaged in transit part and has a visible dent, offered for parts or refurbishment purposes only. Ideal for restoration specialists, collectors, or workshops looking for components at reduced cost.

NOTE: For spares, repair, or core replacement only.

Condition: 
This Gearbox Oil Cooler is brand new and never been fitted. It has some transport damage which is repairable.
Please see the gallery of images before purchasing.

Fits:

• Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
• Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
• Porsche 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010-17
• Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
• Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
• Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
• Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17  

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95831701902

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Engine Cylinder Head Inlet Valve.

This MAHLE Engine Cylinder Head Inlet Valve is a Porsche 911 / 964 engine component designed to regulate the intake of air and fuel mixture into the combustion chamber. Installed within the cylinder head, the inlet valve opens and closes in precise timing with the engine cycle, ensuring efficient airflow for combustion and optimal engine performance.
Sold Each.
x6 Required Per Car.

Fits:

• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93

  
Diagram Ref No 9

What This Product Does:

• Controls intake airflow into the combustion chamber
• Opens and closes in sync with engine timing
• Supports efficient combustion and power generation
• Maintains correct air/fuel mixture flow
• Contributes to engine performance, efficiency, and emissions control

Symptoms Of Wear Or Failure:

• Engine misfires or rough idle
• Loss of power or poor acceleration
• Reduced compression in the affected cylinder
• Excessive fuel consumption
• Ticking or tapping noises from the cylinder head
• Burnt, bent, or carbon-covered valve surfaces
• Check engine light related to combustion faults  

Why Replacement Matters:

• Restores proper airflow and combustion efficiency
• Improves engine power and throttle response
• Maintains correct compression and cylinder sealing
• Reduces fuel consumption and emissions
• Prevents further engine damage caused by valve failure
• Ensures long-term engine reliability and smooth operation

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96410540908

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Engine piston -  Ø  96.50 - Engine type: M 97.21 / M 97.22
This MAHLE engine piston is a high-quality aftermarket replacement engineered to meet the specifications of the Porsche OE piston 98710305113 for Porsche Boxster and Cayman 987 models. This precision-manufactured piston is designed to restore engine performance, compression, and reliability during rebuilds or maintenance.
Price is for EACH (must be purchased as a set of 6)

Fits:
Porsche 987.1 Boxster 3.4L 2006 - 2008
Porsche 987C.1 Cayman 3.4L 2005 - 2008

Specification:
Cyl.Bore:   96.505   mm
Length:  51.8 mm
Compression Height:  32.35 mm
Bolt Length:  56 mm
Bolt:  Ø 22 mm
Valve Pocket Depth 1:  5.5 mm
Valve Pocket Depth 2:  5.5 mm

As a core component of the internal combustion engine, the piston reciprocates within the cylinder bore, compressing the air-fuel mixture before ignition and transmitting combustion forces through the connecting rod to the crankshaft. It works together with piston rings to maintain proper sealing, manage oil control, and withstand high temperatures and pressures associated with engine operation.

Applications:
This piston is suitable for use in Porsche 987.1 Boxster 3.4 L (2006–2008) and 987C.1 Cayman 3.4 L (2005–2008) engines when matched to the correct engine series and specifications. Always verify compatibility with your vehicle’s VIN or engine details before ordering.

Performance & Fit:
Manufactured to MAHLE’s exacting standards, the piston offers a direct fit, excellent thermal performance, and minimal friction with correct clearances. It’s ideal for engine rebuilds, restorations, or replacing worn pistons to help maintain the original driving dynamics and engine efficiency that Porsche owners expect.

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9871030511X

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Engine piston - Ø  96.00 - Engine type: M 97.21 / M 97.22
This MAHLE engine piston is a high-quality aftermarket replacement engineered to meet the specifications of the Porsche OE piston 98710305113 for Porsche Boxster and Cayman 987 models. This precision-manufactured piston is designed to restore engine performance, compression, and reliability during rebuilds or maintenance.
Price is for EACH (must be purchased as a set of 6)

Fits:
Porsche 987.1 Boxster 3.4L 2006 - 2008
Porsche 987C.1 Cayman 3.4L 2005 - 2008

Specification:
Cyl.Bore:  96.005 mm
Length:  51.8 mm
Compression Height:  32.35 mm
Bolt Length:  56 mm
Bolt:  Ø 22 mm
Valve Pocket Depth 1:  5.5 mm
Valve Pocket Depth 2:  5.5 mm

As a core component of the internal combustion engine, the piston reciprocates within the cylinder bore, compressing the air-fuel mixture before ignition and transmitting combustion forces through the connecting rod to the crankshaft. It works together with piston rings to maintain proper sealing, manage oil control, and withstand high temperatures and pressures associated with engine operation.

Applications:
This piston is suitable for use in Porsche 987.1 Boxster 3.4 L (2006–2008) and 987C.1 Cayman 3.4 L (2005–2008) engines when matched to the correct engine series and specifications. Always verify compatibility with your vehicle’s VIN or engine details before ordering.

Performance & Fit:
Manufactured to MAHLE’s exacting standards, the piston offers a direct fit, excellent thermal performance, and minimal friction with correct clearances. It’s ideal for engine rebuilds, restorations, or replacing worn pistons to help maintain the original driving dynamics and engine efficiency that Porsche owners expect.

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9871030511X

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Heater / AC blower
This MAHLE heater / air conditioning blower motor is a high-quality aftermarket interior blower designed to replace Porsche OEM part 8T2820021 specifically for right-hand drive (RHD) Macan vehicles. This blower motor is a core component of the HVAC (heating, ventilation, and air conditioning) system that circulates conditioned air through the cabin, ensuring consistent airflow for heating and cooling functions.

Fits:
RHD (right-hand drive) cars only
Porsche 95B.1 Macan 2014 - 2018
Porsche 95B.2 Macan 2019 - 2021
Porsche 95B.3 Macan 2022>>

Diagram ref no 1

Built to MAHLE’s exacting quality standards, the unit delivers reliable airflow performance and long service life, making it an ideal choice for replacing worn, noisy, or failed blower motors in Porsche Macan 95B models. The blower fits perfectly in RHD vehicles and works with the original climate control system to restore proper passenger comfort.

Function
•  Circulates cabin airflow through heater core and A/C evaporator.
•  Supports climate control operation, whether heating in cold weather or cooling in summer.
•  Enhances defrost/demist performance for clear visibility.

The blower motor is responsible for moving air from the heater core, evaporator, or fresh air inlet into the cabin. Over time the motor can wear, become noisy, or fail entirely, leading to reduced airflow and compromised HVAC performance. Replacing it with a MAHLE unit restores consistent airflow and helps maintain cabin climate comfort.

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8T2820021

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Gearbox oil cooler ATF.
This MAHLE gearbox oil cooler (ATF) is a high-quality aftermarket replacement designed to meet the exacting specifications of Porsche OE part number 95830703700. Engineered for optimal performance and thermal management, this transmission oil cooler helps protect your automatic gearbox by effectively dissipating heat from the ATF (automatic transmission fluid) in Porsche Cayenne 958 (92A) models built 2011–2018 with Tiptronic transmission

Fits:
Cars with 8-speed Automatic gearbox for all-wheel drive (option code: G1G)
Porsche 958 (92A) Cayenne 3.6L 2011 - 2018
Porsche 958 (92A) Cayenne 3.0L / 4.2L Diesel 2011 - 2018
Porsche 958 (92A) Cayenne 3.0L HYBRID 2011 - 2014
Porsche 958 (92A) Cayenne 4.8L 2011 - 2018

Diagram ref no 4

Automatic transmissions generate significant heat under load; without proper cooling, excessive ATF temperatures can accelerate fluid breakdown and wear internal components. This MAHLE oil cooler ensures effective heat transfer and helps maintain correct ATF temperatures, preserving transmission performance, extending component life, and supporting smooth shifting and drivetrain reliability.

This direct-fit cooler comes with a sealed brazed core and integrated seal ring for reliable installation as a genuine replacement for the original heat exchanger.

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95830703700

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Engine oil cooler.
The MAHLE engine oil cooler is a premium aftermarket replacement part engineered to meet or exceed the performance and durability of the original Porsche OE oil cooler. This oil cooler is a vital component of the engine’s lubrication and thermal management system, helping regulate oil temperature to protect internal engine components under demanding conditions.

Fits:
Porsche 95B.2 Macan S 3.0L 2019>> (engine code:  DLZ,DLZB)
Porsche 971.1 Panamera 3.0L V6 2017 - 2021 (engine code:  CXTA,CXT)
Porsche 9YA.1 Cayenne 3.0L 2018 - 2023 (engine code: DCBE, DCB)
Porsche 9YA.2 Cayenne 3.0L 2023>> (PR:T9I)

Diagram ref no 19

Installed within the engine lubrication circuit, the oil cooler circulates hot engine oil through a series of finned cooling channels where heat is dissipated before the oil returns to the engine. By maintaining optimal oil temperatures, it reduces thermal stress, helps preserve oil viscosity, and supports consistent lubrication - critical for long-term engine reliability and performance.

MAHLE’s precision-engineered cooler is designed for use with 3.0 L engines in a range of Porsche models, providing reliable cooling capacity and direct fitment as a replacement for the OE unit.

Fitment / Position on Car
•  Installed on: Front end of engine bay near coolant radiators, integrated with oil and coolant lines
•  Position: Typically mounted ahead of or alongside the engine block, interfacing with dedicated oil lines and the coolant circuit
•  Connection: Uses Porsche-specific fittings and seals for leak-free integration with OE lines

Engine oil not only lubricates but also helps carry heat away from internal surfaces. In high-performance turbocharged engines, oil temperatures can spike rapidly if not effectively controlled. A fresh oil cooler ensures heat is effectively removed from the oil, protecting internal components and maintaining optimal lubrication characteristics under a wide range of operating conditions. 

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9A711701530

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