Clubman Spec: The Next Step in Performance
Bourne HPP’s Honda K20 Clubman build is the perfect solution for track day enthusiasts and entry-level clubman racers looking to elevate their engine’s performance. This build goes “one step further” than a standard refresh, integrating a range of custom Bourne HPP components designed to bridge the gap between a fast road car and a dedicated competitive racer.
The Bourne HPP Standard
Every engine build starts with a meticulous preparation process. Every component and bolt is either brand new or completely refurbished to ensure mechanical integrity and a show-quality finish:
Complete Strip & Inspection: Every internal part is measured and verified against factory tolerances.
Vapour Blasted Castings: Exterior engine castings are restored to a factory finish.
Precision Machining:
Dynamic Crankshaft Balancing for high-RPM smoothness.
Cylinder Bores Honed to exact tolerances for optimal ring seal.
Block and Head Faces Skimmed to ensure perfect gasket mating.
Full Casting Deburring to improve oil return and eliminate stress risers.
Cylinder Head Refurbishment: Valve guides replaced, with valve seats precision cut and lapped.
Aesthetics: Finished with the signature Bourne HPP Blue Cam Cover
High-Performance Engine Upgrades
The Clubman spec features targeted upgrades to improve thermal management and valvetrain stability:
Bottom End
Pistons: Ceramic coated crowns for superior thermal protection and heat reflection.
Oiling: Integrated Anti-Surge Baffle to prevent oil starvation during high-G cornering.
Fasteners: ARP Head Studs for increased clamping force and head gasket reliability.
Cylinder Head & Valvetrain
Camshafts: Bourne HPP 21S Drop-In 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 |
| Power Output | 250BHP |
| Build Type | Hand Built Assembly |
| Rev Limit | 8,600 RPM |
Please note
An Airflow Synchrometer will be needed to check airflow across each port when balancing.
If you require something more bespoke, please contact us.
Motorsport Use Only! This product is designed for professional motorsport applications and must be installed by a qualified technician. If assistance is required, please contact AT Power’s sales team.
