Ford Cosworth YB BHP666+ Piper Camshaft ULTIMATE ROAD CAM - 2026 Profile Update

The BHP 666+ is the evolution of our proven 666 inlet cam for the Cosworth YB platform.

Retaining the effective valve events that made the original so successful, the 666+ introduces modernised ramp geometry for:

• Improved cam follower life

• Reduced edge loading

• Better valve control at high RPM

• Increased stability in high boost applications

• Smoother valve acceleration control

Manufactured by Piper Cams

The BHP camshaft range is now manufactured by Piper Cams, ensuring:

• Superior material consistency

• Precision CNC lobe grinding

• Repeatable lobe geometry

• Exceptional quality control

• Consistent cam-to-cam accuracy

The result is repeatable performance like never before.

Core Specifications

• Valve Lift: 9.6mm

• Advertised Duration: 266°

• Application: Turbo YB specific profile

Proven Cam Combinations

Option 1 - Fast Road / Broad Torque

666+ Inlet & BD8 Exhaust

For the majority of fast-road and strong street builds:

• BHP 666+ Inlet

• Standard BD8 Exhaust

Best Tested Baseline Timing:

• 110° Inlet Centreline

• 110° Exhaust Centreline

Why This Works

• Controlled overlap for turbo efficiency

• Strong cylinder filling without excessive top-end bias

• Maintains exhaust velocity for spool

• Excellent drivability with serious midrange torque

This combination delivers a wide, usable powerband with predictable boost behaviour.

Option 2 - Higher Power / Increased Airflow Builds

666+ Inlet & 666 Exhaust

When airflow increases significantly - larger turbo, increased boost, improved head flow, higher rev limit - the exhaust side can become restrictive.

At higher mass flow levels, the BD8 exhaust can limit blowdown efficiency.

Proven High Power Timing

We have successfully run dual 666 camshafts in 650bhp Cosworth YB engines timed at:

• 108° Inlet Centreline

• 112° Exhaust Centreline

Why 108° / 112° Works

108° Inlet

• Increases dynamic cylinder pressure

• Improves midrange torque

• Enhances spool response

• Helps trap boosted charge efficiently

112° Exhaust

• Controls overlap

• Improves high-RPM blowdown

• Reduces charge loss under boost

• Allows better turbine efficiency at high flow

This configuration:

• Frees up restricted exhaust flow

• Supports higher peak power

• Extends clean power further up the rev range

• Maintains boost stability

Suited To:

• 600–650bhp+ builds

• Larger turbo applications

• Higher rev limit engines

• Track-focused combinations