S&S Cycle Big Twin Special Application Crankcase - 31-0047

The S&S Cycle Special Application Crankcase is engineered to provide exceptional performance and reliability for high-performance engines. Designed with meticulous attention to detail, this crankcase offers advanced features that optimize oil scavenging and ensure compatibility with various engine configurations.

Description

This crankcase is specifically designed for engines with cylinder bores of 4.000", and the cam chest is strategically moved outward by 0.250" to accommodate larger cylinder bore sizes. It's clearanced for strokes up to 5.000", providing flexibility for engine builders. The relocated cam chest oil pick-up significantly enhances gear case scavenging, virtually eliminating oil carry-over, even at sustained high speeds. It's machined to accept the stock oil filter assembly used on '92-'99 Big Twins, simplifying installation. The ported breather passageway and machined breather window optimize airflow from the flywheel cavity to the cam chest, reducing restriction. Crankcase venting can be achieved through two crankcase breathers or the cylinder heads. For engines larger than 95", S&S recommends using both crankcase breathers. With a deck height of 5.875", this crankcase is ready to enhance your engine build. Machined to allow the installation of a crank position sensor, making it suitable for EFI applications, S&S IST Ignition, and VFI Fuel Injection. If a crank position sensor isn't needed, a plug kit is included. Manufactured after June 1, '08, these crankcases feature a flat case mating surface, aligned with alignment dowels for enhanced precision. Made in the USA.

Features & highlights

• Optimized for high-performance engines with 4.000" cylinder bores.
• Accommodates strokes up to 5.000", offering engine building flexibility.
• Enhanced gear case scavenging virtually eliminates oil carry-over.
• Compatible with stock oil filter assemblies used on '92-'99 Big Twins.
• Facilitates EFI applications with machined crank position sensor installation.
• Made in the USA, ensuring top-tier quality and reliability.
• Improved breather system for maximum performance.

Technical specifications

• Brand: S&S Cycle
• Product Name: Engine Case
• Color/Finish: Natural
• Cylinder Bore: 4.000"
• Stroke Clearance: 5.000"
• Deck Height: 5.875"
• Units: Kit

Important to know

This crankcase is designed for special applications and requires professional installation. A plug kit is included for applications not using a crank position sensor. S&S recommends using both crankcase breathers for engines larger than 95".