Radium Engineering IACV Spacer Kit - S14/15

Solve IACV Clearance Issues on Your Nissan S14 or S15 SR20DET Build with the Radium Engineering 20-0162 IACV Spacer Kit

The Radium Engineering 20-0162 is an idle air control valve (IACV) spacer kit designed for the Nissan S14 and S15 platforms equipped with the SR20DET engine. Many aftermarket intake manifolds and engine bay builds on the S14 and S15 create clearance conflicts or positioning issues with the OEM IACV mounting location.

The Radium 20-0162 spacer kit resolves these interference issues by repositioning the IACV to clear aftermarket intake manifold flanges and adjacent engine bay components. The kit is precision machined from high-quality billet aluminum for a leak-free, OEM-quality seal at the IACV mounting face. Correct IACV operation is essential for stable cold-start idle and proper idle control across engine temperature ranges on the SR20DET. The 20-0162 is a focused engineering solution for a common fitment problem on modified S-chassis builds.

Key Features

• Corrects IACV clearance and positioning issues on aftermarket intake manifold builds for Nissan S14 and S15 SR20DET
• Billet aluminum construction for precision fitment and long-term durability
• Maintains proper IACV operation for correct idle control across cold and warm engine temperatures
• Direct-fit installation using existing IACV hardware
• Compact spacer design minimizes engine bay packaging impact

Specifications

What's Included

• 1x Radium Engineering 20-0162 IACV spacer
• Required gaskets or O-rings (per Radium product documentation)
• Fastener hardware

About Radium Engineering

Radium Engineering is a US-based manufacturer specializing in precision-machined fuel system components, catch cans, intake manifolds, and engine accessories for sport compact and high-performance vehicles. Radium products are engineered to solve real-world fitment and functionality challenges on modified builds. All Radium Engineering products are designed and manufactured in the USA.

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Frequently Asked Questions

What is the Radium Engineering 20-0162?

The Radium Engineering 20-0162 is an IACV (idle air control valve) spacer kit for the Nissan S14 and S15 with SR20DET. It resolves fitment and clearance conflicts between the OEM IACV mounting position and aftermarket intake manifolds or adjacent engine bay components by providing a precision billet aluminum spacer that repositions the IACV to clear interference points.

What does an IACV spacer do on the SR20DET?

An IACV spacer repositions the idle air control valve to clear aftermarket intake manifold flanges or other components that interfere with the OEM mounting position. The IACV controls the idle speed by regulating airflow bypass around the throttle plate. Incorrect installation or clearance conflicts with the IACV can cause cold-start idle problems, unstable idle, or high idle at operating temperature. The Radium 20-0162 spacer corrects the mounting geometry without compromising IACV function.

Is the Radium 20-0162 specific to a particular intake manifold?

The Radium 20-0162 is designed as a general clearance correction solution for S14 and S15 SR20DET builds with aftermarket intake manifolds that conflict with the OEM IACV position. Confirm the specific fitment compatibility between the 20-0162 and your intake manifold by reviewing the Radium Engineering product documentation or contacting Radium Engineering directly before installation.

Does the Radium 20-0162 work on the S14 Kouki and S15 Silvia?

The 20-0162 is listed for the Nissan S14 and S15 with SR20DET, which covers both the S14 (including Kouki) and S15 Silvia variants equipped with the SR20DET engine. Confirm your specific chassis and engine configuration against the Radium 20-0162 specification sheet before purchasing.

Will the IACV spacer affect idle quality?

When properly installed with a good seal at both mating faces, the Radium 20-0162 spacer does not negatively affect idle quality. It is designed to maintain the correct IACV function by providing a dimensionally accurate spacer with proper sealing surfaces. An air leak at the spacer interfaces, caused by improper installation or damaged gaskets, would affect idle quality and must be corrected.

Is the Radium 20-0162 a universal part?

The 20-0162 is designed for the Nissan S14 and S15 SR20DET IACV mounting configuration. While the SR20DET appears in multiple Nissan applications, the S-chassis IACV mounting dimensions are specific to that platform. Compatibility with other SR20DET applications such as the Pulsar or Primera should be confirmed directly with Radium Engineering before purchase.

Does this require a tune after installation?

Installing an IACV spacer does not typically require a full engine retune when the IACV remains properly operational. If the spacer is installed as part of a larger intake manifold upgrade that changes airflow volumes or plenum geometry, a retune may be required to recalibrate idle and fuel trims for the new intake configuration.

Does the Radium 20-0162 come with a warranty?

Radium Engineering products are backed by the manufacturer against defects in materials and workmanship. Contact Radium Engineering for warranty terms and duration applicable to the 20-0162.

Installation Instructions

1. Ensure the engine is cold and the vehicle is on a stable, level surface before beginning. Disconnect the negative battery terminal.
2. Locate the existing IACV on the SR20DET intake manifold and disconnect the IACV electrical connector and coolant hoses if applicable.
3. Remove the OEM IACV mounting hardware and carefully remove the IACV from the intake manifold.
4. Clean the IACV mounting face on the intake manifold to remove any old gasket material or sealant.
5. Install the Radium 20-0162 spacer onto the IACV mounting location using the provided hardware and gaskets.
6. Reinstall the IACV onto the spacer, ensuring the gaskets or O-rings are properly seated for a leak-free seal. Torque the IACV mounting hardware to the specified value.
7. Reconnect all coolant hoses and the IACV electrical connector.
8. Reconnect the negative battery terminal and start the engine. Monitor idle quality and check for any air leaks at the spacer mating surfaces.