Atomic Barra Billet Crank Destroker Kit: The Absolute Race Foundation
The Destroker Kit is the ultimate engineering solution for the dedicated Barra racer. Built to shatter RPM ceilings and withstand monumental boost, this package eliminates the compromises inherent in the OEM stroke by redesigning the engine’s foundation for maximum stability, longevity, and speed.
The Core: Atomic 86mm Billet Crankshaft
The foundation is the Atomic 86mm Destroker Crankshaft. Machined from a single block of Premium BS970/EN26 Billet Steel, this crankshaft offers unmatched tensile strength and fatigue resistance.
| Feature |
Engineering Justification |
Performance Benefit |
| 86mm Short Stroke |
Reduces piston travel compared to the OEM 99.2mm stroke. |
Unlocks a higher, safer redline by significantly reducing piston speed and cylinder wall side-loading. |
| Full Aero Counterweights |
Aerodynamically designed to slice through oil in the crankcase. |
Improves High-RPM Stability by actively reducing windage and rotational drag. |
| Straight Shot Oiling |
Provides a direct, consistent oil supply path to the crankpins and conrods. |
Ensures maximum performance and bearing life under extreme oil pump pressure and high temperatures. |
| Nitrided and Heat Treated |
Surface hardened for exceptional wear resistance. |
Provides a durable, long-lasting foundation, reducing strain on bearings and main caps. |
The Unmatched Rotating Assembly
This kit pairs the billet crank with components engineered to absorb the most punishing loads, creating an assembly rated for 1800+hp and over 9000 RPM.
Atomic Short Stroke FatRod Conrods
These rods have been hugely successful on the Barra platform, with zero recorded H-beam failures since their release in 2004!
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Length: 161.29mm (6.350 inches) — Optimized for the 86mm destroker crank.
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Profile: Massive H-beam design with a 13% wider and 14% thicker beam vs. standard billet rods.
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Innovation: Features pressure-fed wrist pin oiling and piston crown cooling channels—innovations only found in professional motorsport.
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Fasteners: Fitted with CA625 high-strength fasteners to survive over 8000g's of TDC reversal force.
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Material: CNC-machined from aerospace-grade billet steel.
Atomic Cosworth F1 Series Forged Pistons
Designed by Cosworth UK specifically for Atomic, these are the ultimate pistons for high-boost reliability, proven beyond 1200RWKW.
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Material: 2618 Forged Aluminium—aerospace grade for superior strength and thermal stability.
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Structural Support: Features six internal struts to support the crown and pin bosses, crucial when absorbing 8–9 tonnes of combustion force sixty times per second.
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Thermal Control: Fully polished crown rejects combustion heat and Xylan-coated skirts reduce friction and wear.
Destroker Specifications & Summary
This kit represents the pinnacle of Barra engineering, guaranteeing a foundation that will perform reliably at competition levels.
| Specification |
Detail |
| Stroke: |
86mm (Destroker) |
| Rod Length: |
161.29mm (6.350 inch) |
| Rod Type: |
Atomic Billet FatRod H-Beam, CA625 Bolts, Oil Fed Pin & Crown Cooling |
| Piston Material: |
Cosworth F1 Series 2618 Forged Aluminium |
| Crank Material: |
BS970/EN26 Billet Steel, Nitrided, Aero Counterweights |
| Engine Focus: |
High-RPM, High-Boost Competition (1800+ HP Rated) |
