Volkswagon AC198930EC Engine Piston Set

Brand Volkswagon AC198930EC
Fits Volkswagen · 106 vehicles

Hypereutectic construction. Built for air-cooled engine rebuilds and big bore applications.

92 mm x 82 mm size. Matches the cataloged bore and stroke specification for listed builds.

Machining required. Use on applications that call for case preparation during installation.

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Overview

This engine piston set is built for air-cooled Volkswagen applications that require a 92 mm x 82 mm big bore configuration. Part number AC198930EC is listed for multiple Volkswagen models and years, including Beetle, Transporter, and Karmann Ghia fitments.

Use AC198930EC when you need a hypereutectic piston set for a performance-oriented engine build that requires machining. Fitment notes also reference use with AS41-style cases on select applications.

Key Features

  • 92 mm x 82 mm big bore piston configuration
  • Hypereutectic construction for engine build applications
  • Machining required for installation on listed fitments
  • Referenced for Volkswagen Beetle, Transporter, and Karmann Ghia applications
  • Part number AC198930EC for catalog and fitment matching

Detailed Description

AC198930EC is an engine piston set for Volkswagen air-cooled engines that use a 92 x 82 mm big bore setup. The fitment data covers a wide range of classic Volkswagen models, including Beetle, Super Beetle, Combi, Transporter, Campmobile, Karmann Ghia, Thing, Fastback, Squareback, and Standard. Because the listed applications require machining, this part is suited to rebuilds and displacement changes where the engine case is being modified to accept the larger piston and cylinder dimensions.

For buyers searching for a Volkswagen Beetle piston set, Volkswagen Transporter engine piston set, or Karmann Ghia big bore piston set, AC198930EC matches the cataloged 92 mm x 82 mm specification. The fitment notes should be reviewed carefully before ordering, especially where AS41-style case usage is specified. This part number, AC198930EC, is also useful when cross-checking engine build components against the vehicle application list.

What It Is Used For

  • Replacing worn pistons during an engine rebuild
  • Increasing displacement with a big bore setup
  • Restoring compression in a modified air-cooled engine
  • Supporting machining-based case preparation
  • Matching cataloged Volkswagen engine build specifications

Installation Notes

Installation requires machining on the listed applications. Review the fitment notes for each vehicle before assembly, including references to AS41-style case use where shown. Confirm all engine dimensions and clearances during the rebuild process to ensure the piston set matches the intended engine configuration.

Quality Assurance

This piston set is cataloged with hypereutectic construction and application-specific fitment data for classic Volkswagen engine builds. Part number AC198930EC should be verified against the engine case, bore, and stroke requirements before installation.

This part fits 106 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersNotes
1979VolkswagenCombi——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1979VolkswagenSuper Beetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1979VolkswagenTransporter——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1978VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1978VolkswagenCombi——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1978VolkswagenSuper Beetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1978VolkswagenTransporter——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1977VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1977VolkswagenCombi——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1977VolkswagenSuper Beetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1977VolkswagenTransporter——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1976VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1976VolkswagenCombi——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1976VolkswagenSuper Beetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1976VolkswagenTransporter——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1975VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1975VolkswagenCombi——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1975VolkswagenSuper Beetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1975VolkswagenTransporter——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1974VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1974VolkswagenCampmobile——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1974VolkswagenCombi——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1974VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1974VolkswagenSuper Beetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1974VolkswagenThing——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1974VolkswagenTransporter——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1973VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1973VolkswagenCampmobile——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1973VolkswagenCombi——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1973VolkswagenFastback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1973VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1973VolkswagenSquareback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1973VolkswagenSuper Beetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1973VolkswagenThing——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1973VolkswagenTransporter——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1972VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1972VolkswagenCampmobile——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1972VolkswagenCombi——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1972VolkswagenFastback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1972VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1972VolkswagenSquareback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1972VolkswagenSuper Beetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1972VolkswagenTransporter——Hypereutectic; Set of 4; 92 x 82 mm; Machine Work Required; AA Performance Products
1971VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1971VolkswagenCampmobile——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1971VolkswagenFastback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1971VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1971VolkswagenSquareback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1971VolkswagenSuper Beetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1971VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1970VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1970VolkswagenCampmobile——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1970VolkswagenFastback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1970VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1970VolkswagenSquareback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1970VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1969VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1969VolkswagenCampmobile——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1969VolkswagenFastback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1969VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1969VolkswagenSquareback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1969VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1968VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1968VolkswagenCampmobile——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1968VolkswagenFastback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1968VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1968VolkswagenSquareback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1968VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1967VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1967VolkswagenFastback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1967VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1967VolkswagenSquareback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1967VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1966VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1966VolkswagenFastback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1966VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1966VolkswagenSquareback1.6LH4Big Bore; Machining Required; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1966VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1965VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1965VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1965VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1964VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1964VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1964VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1963VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1963VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1963VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1962VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1962VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1962VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1961VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1961VolkswagenKarmann Ghia——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1961VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1960VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1960VolkswagenTransporter——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1959VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1958VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1957VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1956VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1955VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1954VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1953VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1952VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1951VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1950VolkswagenBeetle——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks
1949VolkswagenStandard——Hyper Eutectic 92mm x 82mm Big Bore; Machining Required on case to install; Use with AS41 Style Case; 92 x 82mm; B Piston; Hypereutectic; Machining Required; Kühltek Motorwerks