Radium Engineering Port Injection Fuel Rail Kit - Honda Civic Type-R FK8 17-21/FL5 22+

Radium Port Injection Fuel Rail Kit - Honda Civic Type-R FK8 17-21/FL5 22+

Application: Honda Civic Type R FK8 / FL5 and Acura Integra Type S DE5 (K20C1)
Part Type: Port injection kit - adapter plate and fuel rail
Part Number: 20-0428

The Radium Port Injection Kit (PIK) adds a bank of port fuel injectors to the direct-injected Honda K20C1. The kit installs between the intake manifold and the cylinder head, supplying the additional fuel that high-horsepower K20C1 builds need. It does not replace the OEM direct injection system - it works alongside it - and it is compatible with all fuel types including E85 and other alcohol blends.

The fuel rail is CNC-machined from extruded 6063 aluminium with a 16mm (0.63in) internal bore and a laser-etched finish, and the injectors are set at a specific angle for correct spray into the intake ports. Insulating spacers and washers isolate the rail from cylinder head heat.

Key Features

• Supplements OEM Injection: Adds port injection while retaining the factory direct injection system
• Four 8AN ORB Ports: All rail ports tapped 8AN ORB (3/4"-16) for fittings, regulators, dampers or gauges
• Extruded 6063 Aluminium Rail: CNC-machined with a 16mm (0.63in) internal bore and laser-etched finish
• Correct Spray Angle: Injectors are set at a specific angle to target the intake ports
• Thermal Isolation: Insulating spacers and washers isolate the rail from cylinder head heat
• Fuel Compatibility: Suits all fuel types including E85 and other alcohol blends

What's Included

• PIK adapter plate
• Custom fuel rail
• Fuel rail mounting hardware
• OEM Honda gaskets
• Insulating mounting spacers and washers

Optional Parts

• Radium 14-0150 8AN ORB Plug, Round Internal Hex (14-0150) - plugs the two top fuel rail ports (required unless the OEM plastic wiring harness carrier is modified)

Important Notes

• Fuel injectors, port fittings, fuel hose, wiring and an injector controller are not included (Radium does not sell injectors)
• Injectors must be universal-style with 14mm upper and lower O-rings - only 34mm short-body (lower mounting holes) or 48mm medium-body (upper mounting holes) injectors are compatible, e.g. Injector Dynamics 1050/1300/1700/2600-XDS in .34.14.14 or .48.14.14 form
• The kit raises the intake manifold off the head, so a custom fabricated throttle body pipe, or an offset silicone coupler with the OEM pipe, is required
• The two top fuel rail ports must be plugged with 14-0150 plugs unless the plastic OEM wiring harness carrier is modified
• Choose fittings to suit your application and allow ample clearance around the rail ports for regulators, gauges and dampers
• Installation instructions are available in the Instructions tab

Vehicle Fitment

• Honda Civic Type R FK8 - K20C1
• Honda Civic Type R FL5 - K20C1
• Acura Integra Type S DE5 - K20C1

For application support, send your vehicle details to TJ Auto Parts through the Parts Finder.

Supplier-listed applications:
- Honda Civic Type R FK8 - K20C1
- Honda Civic Type R FL5 - K20C1
- Acura Integra Type S DE5 - K20C1

Note: Compatibility information is provided as a general guide only. Some vehicles may have multiple part variations for the same model or engine. To ensure this product is the correct fit and to be eligible for our Fitment Guarantee, please contact our team before purchasing.