K20 N1: Group N Compliance & Performance The Bourne HPP Honda K20 N1 is specifically engineered for racers required to run a Group N engine to meet stringent class regulations. By utilising the highest quality Honda-manufactured JDM components, this build is also the perfect application for enthusiasts seeking a high-revving, naturally aspirated "fast road" or dedicated track engine. Delivering up to 250 BHP, the N1 build balances factory-level reliability with professional motorsport performance. The Bourne HPP Standard Every N1 engine undergoes our exhaustive preparation process. Every component and bolt is either brand new or meticulously refurbished to ensure maximum mechanical integrity: Complete Strip & Inspection: All internals are measured and verified against strict factory tolerances. Vapour Blasted Castings: Exterior engine castings are restored to a factory-fresh, show-quality finish. Precision Machining: Dynamic Crankshaft Balancing for high-RPM stability. Cylinder Bores Honed to exact tolerances for optimal compression. Block and Head Faces Skimmed to ensure a perfect head gasket seal. Full Casting Deburring to optimise oil return and remove stress points. Cylinder Head Refurbishment: New Beryllium Copper valve guides and seats cut and lapped. Aesthetics: Finished with the signature Bourne HPP Blue Cam Cover High-Performance Engine Upgrades The N1 build incorporates premium JDM "RRC" components and upgraded fasteners to ensure durability under competition conditions: Bottom End Pistons: Genuine JDM RRC High-Compression Pistons. Fasteners: ARP Rod Bolts for bottom-end security at high RPM. Oiling: Integrated Anti-Surge Baffle to protect against oil starvation on track. Head Retention: ARP Head Studs for maximum clamping force. Cylinder Head & Valvetrain Camshafts: JDM RRC Camshafts. Valves: Bourne HPP high-performance Inlet & Exhaust Valves Springs: Bourne HPP Upgraded Valve Springs Hardware: Bourne HPP specialized Inlet and Exhaust studs Technical Specifications Feature Details Engine Base Honda K20 Compliance Group N Regulations Power Output Up to 250 BHP Build Type Hand Built Assembly Note: Any components or procedures not required for your specific build requirements will be reimbursed. We pride ourselves on flexibility; please contact us directly for bespoke engine assemblies tailored to your specific regulations or budget.
