Boundary Engine Timing Crankshaft Sprocket

Boundary Billet Crankshaft Timing Sprockets: Precision-Engineered for High-Performance Engines

When it comes to protecting your engine's valve timing under demanding conditions, the crankshaft sprocket is one of the most critical links in the chain. Boundary Racing Pumps brings the same obsessive engineering philosophy behind their legendary oil pump components to their line of engine timing crankshaft sprockets — delivering billet-machined upgrades that leave OEM powdered metal parts far behind.

Why Boundary Crankshaft Sprockets Stand Apart

The core difference starts with the material. Boundary's billet crankshaft sprockets are machined from chromoly steel that is ten times stronger than the OEM powdered metal equivalent. Each sprocket is hot quenched with a low temper process specifically chosen for the highest possible strength and resistance to wear — a meaningful advantage in boosted, high-RPM, or track-driven applications where stock components are prone to failure.

Billet crank sprockets from Boundary follow the same heritage as their oil pump gears, manufactured 100% in-house with US-sourced materials. All gear sets are designed and manufactured in America, in-house — they don't outsource machining or design work. That commitment to keeping production under one roof means tighter tolerances and more accountability at every step.

Engineered Details That Matter

Boundary's crankshaft sprockets are not simply drop-in replacements — they are a measurable upgrade in every dimension. Key engineering features include:

• All sprockets are heat-treated to maximum hardness while maintaining toughness, and are precision CNC machined and broached for a snug, accurate fit.
• Dimensions are checked after machining and after heat treatment for a guaranteed fit.
• Each sprocket weighs 30% more than OEM — 170 grams versus 130 grams — giving it one of the highest strength-to-size ratios on the market.
• An 80% greater cross-section versus OEM at the keyway, along with new tooth geometry that strengthens both the teeth and keyway.
• A high-quality surface finish that reduces friction and minimizes chain vibration over time.

Specialized Variants for Specific Applications

Boundary offers several crankshaft sprocket variants to cover different performance needs. For Ford's popular Coyote 5.0 V8 platform, the Coyote crankshaft timing sprocket with grip surface improves the durability of the crankshaft snout and keyway by limiting the movement of the harmonic balancer. A large-radius (LR) version is also available, fitting Windberg, Callies, and other crankshafts with a large nose radius. Boundary also produces billet crank sprockets for Nissan's QR25DE engine family, making their lineup relevant beyond the Ford platform.

Each sprocket is CNC-machined in the USA from billet steel for secure high-RPM cam timing and is backed by a lifetime warranty. That warranty reflects Boundary's confidence in their manufacturing process — and gives performance builders the peace of mind to push their engines harder.

Whether you're building a street-driven Mustang GT, a supercharged Shelby GT500, or a Nissan QR-powered track car, Boundary's crankshaft timing sprockets deliver a precision foundation for your entire valvetrain. Browse the full selection of engine timing crankshaft sprockets or explore everything Boundary Racing Pumps has to offer.