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Products > Engine Crankcases > Racing

4-Cam Racing Crankcases

Crankcases for Racing
Delkron continues to manufacture our revolutionary 4-Cam Big Twin Motor Case to meet the demands of high performance builders worldwide. The DR-2 is produced from 6060-T6 billet aluminum to ensure uniform strength and hardness throughout. Minimum overall case thickness is .400" with drive side thickness more than 1.250" with almost .900" between the flywheel cavity and the cam locating surface. This provides the most rigid flywheel support of any case available! The motor mounts have two reinforced ribs for extra strength at the same locations as the OEM Big Twin cases. The drive side is machined to accept late model Timken bearings for the 1.25" sprocket shaft. The pinion side is machined to accept a single Timken and ball-bearing configuration for maximum flywheel support.

Technical Specs
The DR-2 utilizes a dry sump oiling system with the scraper at the bottom and uses the very efficient Harley-Davidson® Sportster® (1986 – 1990) gerotor type oil pump for superior oil pressure and scavenging. The DR-2 also has the vastly superior Harley-Davidson® Sportster® engine valve train geometry while retaining the strength of the Big Twin flywheel assembly. Camshaft locations are on the same centerline as the stock Harley-Davidson® Evolution® Sportster® (1986 – 1990), but moved away from the flywheel assembly, allowing use of the wide variety of cam sets available for these models. Options offered are cylinder bore up to 4.5", cylinder deck height of up to 2" higher than stock, cylinder base bolt pattern, and a fuel pump boss on the timing cover. The pinion shaft is supplied with the case.

The DR-2S Street Version has all the features of the DR-2 along with a cutout for an alternator and Evo Sportster style lifter blocks.

Crankshaft assemblies can be purchased from S&S Cycles in Viola, Wisconsin or Truett & Osborne in Wichita, Kansas. For further information about big bore cylinders and pistons for these cases, contact Mr. Ron Dickey at Axtell Sales in Des Moines, Iowa. A parts list for the lower-end will be provided upon receipt of deposit for easy reference.

Each Racing Crankcase is a custom order item. Due to customization this product is not available for online purchase.


Delkron 4-Cam Racing Crankcases

New! 4-Cam & High Deck Pinion Bearing SetCam Bushing for 4-Cam & Harley-Davidson® Sportster® MotorcyclesCam Bushing Rear Intake for 4-Cam & Harley-Davidson® Sportster® Motorcycles
©2016 Cometic Gasket Inc | All rights reserved. | EVOLUTION, EVO, DYNA WIDE GLIDE, SPORTSTER, SOFTAIL, BUELL, FXST, FLH, TWIN CAM 88 and Hogs are registered trademarks of Harley-Davidson Motorcycle Co. Delkron, Inc. is not affiliated with Harley-Davidson Motorcycle Co. in any manner. Harley-Davidson Motorcycle Co. does not sponsor or endorse any of Delkron's products or services.
All Delkron products are proudly made in the U.S.A.
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