BUGPACK forged flanged crankshaft for high-horsepower air-cooled VW engine builds — forged from 4340 chromoly steel with nitrided Type-IV main journals and Chevy rod journals. The 6-bolt, 6-pin flange eliminates flywheel-to-crank movement that costs power and durability at high RPM. Select your stroke from the dropdown.
Application
High-horsepower air-cooled VW engine builds requiring a forged crank
Builds spec'd for Chevy rod journals (2.000" small-block Chevy)
Type-IV main journal compatibility
Flange-style flywheel mounting (6-bolt, 6-pin)
Why a forged crank
Cast cranks fail at high RPM and high load. A forged 4340 chromoly crank, properly nitrided and balanced, is the foundation for any engine making real power. The Chevy journal allows use of a far wider range of high-end aftermarket rods (Carrillo, Eagle, Manley, Scat, etc.) than the OEM VW journal sizes permit — cost-effective compared to building around custom VW-journal rods.
Stroke options
78mm — B4-0002-5
82mm — B4-0003-1
84mm — B4-0002-6 (big-stroke option)
Specifications
Material: 4340 chromoly forged
Main journals: Nitrided, Type-IV
Rod journals: Chevy (2.000")
Flywheel flange: 6-bolt, 6-pin
Sold as: Each
Weight: ~24 lb (shipping)
About BUGPACK
BUGPACK is EMPI's high-performance engine and chassis line for the air-cooled VW community. The forged crank program targets serious horsepower builds where stock or cast components won't survive.
WARNING: This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information, go to www.P65Warnings.ca.gov. All parts legal for use on pre-pollution controlled vehicles only.
