Jackspania – K20 tucked Engine Harness

Product Overview & Specifications

The Jackspania K20 tucked engine harness is designed as a high-quality replacement for 02-04 RSX Type-S harnesses, offering a clean, professional appearance for K-series engine swaps into Honda Civics. This harness stands out with its meticulous engineering and quality components.

Key Specifications:

  • Construction: SAE certified automotive grade wiring resistant to moisture and solvents
  • Protection: Military-grade heat shrink loom covering the entire harness
  • Temperature Rating: -55°C to 150°C (-67°F to 320°F)
  • Design: Clean tucked wire layout with main harness running over valve cover
  • Injector Configuration: Hidden injector plugs coming up from under the manifold
  • Connectors: RDX injector plugs come standard with all harnesses
  • Power Management: Thin but high-grade power wire to keep overall size down
  • Compatibility: Works with fuse box in factory location or relocated under dash
  • Organization: All components clearly labeled for simple installation

The harness includes all necessary plugs with extras including Fan Switch, IACV, Temperature Sensor, and more. The Version 2 design allows for more universal chassis application and routing preference, working around aggressive headers and turbo manifolds.

Pros & Cons

Pros:

  • High-Quality Materials: Uses professional automotive-grade wiring resistant to moisture, gas, diesel, and most solvents
  • Clean Appearance: Tucked design provides a professional engine bay aesthetic
  • Comprehensive Package: Includes all necessary plugs plus extras for versatility
  • Universal Design: Works with nearly all K-Series engine swaps
  • Clear Labeling: All components clearly marked for straightforward installation
  • Temperature Resistance: Military grade loom rated for extreme temperatures
  • Versatile Routing: Version 2 allows multiple routing options through firewall
  • Engine Management Compatibility: Works with different systems including Hondata and AEM

Cons:

  • Limited Compatibility (Version 1): Some versions won’t fit RHD cars or RWD applications
  • Potential Connector Issues: Some users report problems with connector quality in similar harnesses
  • Customer Service Concerns: At least one user reported poor response from Jackspania (though for a different product)
  • Pin Configuration: Some users needed to swap pins at the C101 connector to fix no-spark issues

What People Are Saying

From Forums:

K20A.org users report mixed experiences with similar tucked harnesses. One user noted: “The connectors that come with this harness are junk and allow a break in contact because they fit loose causing insane stuttering/misfiring”. However, they continued using the harness successfully after making modifications.

From Product Reviews:

Customer reviews on Jackspania’s site are overwhelmingly positive with a 100% rating based on 9 reviews. One customer noted it was a “clean tucked harness, no issues, easy to install.. a+ quality..”. Another called it the “Recommended best bang for your buck”.

From Reddit:

In a thread about K24a2 swap options for 7th gen Civic, users discussed various harness manufacturers including rywire, ktuned, and hybrid racing, though Jackspania wasn’t specifically mentioned.

Other Info & Common Issues

Interesting Design Elements:

  • Injector wiring runs from under the manifold between middle runners for a cleaner appearance
  • Ground wire is relocated to a stud under the coil pack cover instead of the front of the valve cover
  • Includes 3 auxiliary wires running from ECU to under intake manifold with pre-installed ECU pins
  • Compatible with both VSS low frequency and high frequency configurations
  • Version 2 specifically designed to accommodate aggressive headers and turbo manifolds

Common Issues and Solutions:

  • No Spark Problems: Some users of similar harnesses reported needing to swap pins 7 and 20 at the C101 connector
  • Connector Quality: Loose-fitting connectors may cause intermittent connection issues, particularly with crank sensor (CKP) and throttle position sensor (TPS)
  • Recommended Modifications: Some users recommend replacing the ring terminal with a quality solid ground lug for better performance
  • VSS Configuration: High frequency transmissions require repinning plug and slight VSS modifications

Vehicle Fitment

Compatible Vehicles:

  • K-Swap Applications: Works with most K-swap projects

Honda Models:

  • 01-05 Civic EP3 (Type S or K24 Swap)
  • 92-95 EG Civic (with conversion harness)
  • 96-98 EK Civic (with conversion harness)
  • 88-91 Civic/CRX (with K-swap conversion harness)

Acura Models:

  • 02-04 RSX Type S and Base
  • 94-01 DC2 Integra (with conversion harness)

Common Swap Configurations:

  • K20/K24 into various generation Honda Civics
  • K20/K24 into Acura Integra DC2
  • Version 2 supports K-series swaps into RWD applications

Required Modifications:

  • For high frequency transmissions: repinning plug and minor VSS modifications
  • Version 2 may require routing through center or passenger side of firewall
  • Some users report needing to swap pins 7 and 20 at C101 connector for proper function
  • K-swaps into 7th generation Civics may require specific conversion harnesses

Where to Buy

Official Product Pages:

Related Conversion Harnesses:

Conclusion

The Jackspania K20 tucked engine harness represents a solid option for Honda Civic owners pursuing K-series engine swaps. With high-quality materials, comprehensive plug compatibility, and a clean tucked design, it offers both functionality and aesthetics. While some users have experienced minor issues with similar harnesses, the overall reception is positive, with many praising its quality and ease of installation. For the best results, buyers should be prepared for potential minor modifications depending on their specific application, particularly with regard to connector quality and pin configuration.