Radium Engineering Top Feed Fuel Rail Conversion | Nissan KA24DE (20-0957)

The KA24DE's side feed injectors are the wall between a turbo 240SX and the injectors it actually needs.

Side feed injector selection stalled a decade ago while top feed development never stopped, and every big-power KA hits that shelf. The Radium Engineering Top Feed Fuel Rail Conversion for the Nissan KA24DE knocks the wall down: a direct bolt-on for all twin cam KA24DE engines, CNC machined from solid 6061 aluminum, black anodized, with a large 0.69" internal bore supporting all necessary power levels. The rail converts the OEM side feed setup to top feed, opening the entire modern 14mm O-ring injector catalog, with two spacer sets in the kit supporting both 48mm and 34mm injector heights. Three 8AN ORB ports (ends and bottom) plus a 1/8" NPT top port handle plumbing and instrumentation. All fuels including E85.

What You'll Feel

• The full modern injector catalog unlocked, from mild upgrades to 2600cc flow
• Rail volume that never becomes the restriction, with the 0.69" bore feeding all four cylinders evenly
• Fueling stability under high pressure where the restrictive OEM rail falls behind
• Cooler rail temperatures via phenolic spacers resisting heat transfer from the head
• Ports for the regulator, damper, gauge, or sender the build calls for

Features

• Direct bolt-on for all twin cam Nissan KA24DE engines; converts side feed to top feed injection
• 0.69" internal bore, CNC machined solid 6061 aluminum, black anodized
• Accepts high flow injectors with 14mm O-rings top and bottom (injectors MUST have 14mm O-rings; not included)
• Two phenolic spacer sets included, fitting 48mm (tall spacers, long bolts) or 34mm (short spacers) injector heights
• 4x Radium 30mm injector seats (20-0160) included
• 3x 8AN ORB ports (both ends and bottom) plus 1x 1/8" NPT top port; all fuels including E85

The Details

Injector fitment is fully documented, which is rare and valuable in conversion rails. With the tall spacers and longer bolts, verified direct fitments include the Injector Dynamics ID1050, ID1300, ID1700, and ID2600 in XDS-48-14-14 configuration, and the short spacer set covers 34mm-body injectors with the same 14mm O-ring requirement. The phenolic spacers do double duty, setting injector height while thermally isolating the rail from the head. One manifold note from Radium: on an Xcessive intake manifold, the rail may need shimming to proper height depending on injectors, and the included aluminum injector seats go unused. Plumbing runs through the 8AN ORB ports with Radium adapter fittings, and the NPT port takes a gauge or sender with PTFE paste. Injectors and fittings sold separately.

Kit Includes

• 1x Black anodized aluminum top feed fuel rail
• 2x Phenolic mounting bolt spacers short, 2x tall, 2x phenolic washers
• 4x Radium 20-0160 30mm injector seats
• 2x Stainless mounting bolts short, 2x tall
• Injectors and adapter fittings NOT included

Applications

• All twin cam Nissan KA24DE engines: 1991-1998 240SX S13/S14 and KA swaps
• Injectors with 14mm upper and lower O-rings, 48mm or 34mm heights (ID1050/1300/1700/2600-XDS-48-14-14 verified with tall spacers)
• Xcessive manifolds: may require shimming; included seats unused