Designed for enthusiasts replacing their original D-Series engine with a Honda K20 or compatible K24 engine, the Innovative Mounts 99150 provides the specialized mounting components necessary to position and secure a K-Series drivetrain within the fourth-generation Civic and second-generation CRX chassis.

The lightweight Honda Civic and CRX platforms have long been favorites among Honda performance enthusiasts. Combining these compact chassis with Honda's modern K-Series engine technology creates opportunities for increased horsepower, improved torque, and extensive aftermarket performance upgrades.

However, installing a K-Series engine into an older Civic or CRX requires significant changes to the original engine and transmission mounting arrangement.

The Innovative Mounts 99150 addresses these requirements with a purpose-built steel conversion mounting system featuring three primary drivetrain mounts, two specialized mounting brackets, and performance polyurethane bushings.

Designed for vehicles originally equipped with either manual or automatic transmissions, the 99150 supports conversions using specified Honda K20-style hydraulic manual transmissions.

Innovative Mounts engineers the system to position the engine and transmission for the supported swap configuration while minimizing axle binding. Its polyurethane bushings help control excessive drivetrain movement during acceleration, deceleration, and shifting.

Featuring CAD/CAM-engineered components, stress-analyzed construction, and Innovative Mounts' no-tear polyurethane bushing design, the 99150 provides a strong foundation for naturally aspirated K20 builds, turbocharged K-Series applications, autocross projects, drag racing vehicles, and dedicated motorsport builds.

Important: Installation requires welding a self-locating bracket to the chassis, modifying the rear subframe, and providing additional hood clearance. This is not a direct bolt-in conversion.

Features

• 1988–1991 Honda Civic & CRX Compatibility: Engineered for ED, EE, and EF chassis.

• K-Series Engine Conversion: Designed for K20 and properly configured K24 engine swaps.

• Manual or Automatic Donor Chassis: Supports vehicles originally equipped with either transmission type.

• Hydraulic Manual Transmission Compatibility: Designed around specified K20-style manual transmissions.

• Three-Mount Conversion System: Includes driver-side, passenger-side, and rear drivetrain mounts.

• Two Conversion Mounting Brackets: Includes specialized brackets for the passenger-side and rear mounting arrangements.

• Durable Steel Construction: Designed for demanding street and motorsport applications.

• Engine Positioning Designed to Minimize Axle Bind: Helps maintain appropriate drivetrain geometry when installed as specified.

• Performance Polyurethane Bushings: Reduce excessive drivetrain movement compared with conventional rubber mounts.

• No-Tear Bushing Design: Designed for performance applications while providing some vibration isolation.

• CAD/CAM Engineered: Developed for accurate mounting geometry and component consistency.

• Stress-Analyzed Construction: Engineered to withstand demanding drivetrain loads.

• Improved Drivetrain Stability: Helps control engine movement during acceleration and shifting.

• Reduced Mount Deflection: Helps maintain consistent engine and transmission positioning.

• Improved Driving Response: Firmer mounting can provide a more connected drivetrain feel.

• Potential Wheel Hop Reduction: Reduced drivetrain movement may help minimize wheel hop.

• Multiple Bushing Hardness Options: Available in 75A, 85A, and 95A polyurethane configurations.

• Mounting Hardware Included: Supplied with the manufacturer's specified hardware.

• Lifetime Warranty: Backed by Innovative Mounts' lifetime warranty, subject to manufacturer terms.

Popular Performance Applications

1988–1991 Honda Civic K20 Engine Swaps

The primary application for the Innovative Mounts 99150. Provides the specialized mounting components needed to install a compatible K20 engine and manual transmission into a fourth-generation Civic.

1988–1991 Honda CRX K20 Engine Swaps

An excellent solution for converting a lightweight CRX to modern Honda K-Series power.

K24 Engine Conversions

Supports properly configured K24 engines using the required Honda 11910-PPA-000 mounting bracket and compatible K20-style transmission.

Naturally Aspirated K-Series Performance Builds

Suitable for engines equipped with upgraded intake manifolds, performance headers, camshafts, and other naturally aspirated modifications.

Turbocharged K20 and K24 Applications

Provides a performance-oriented mounting solution for properly configured forced-induction builds.

Autocross and Road Racing

Performance polyurethane bushings help maintain more consistent drivetrain positioning during acceleration, braking, and cornering.

Drag Racing Applications

Firmer bushings help resist excessive engine movement during aggressive launches.

Automatic-to-Manual K-Series Conversions

Designed to accommodate compatible Civic and CRX chassis originally equipped with automatic transmissions when converting to a supported hydraulic manual drivetrain.

Additional Information

• Manufacturer: Innovative Mounts
• Part Number: 99150
• Product Type: Steel K-Series Engine Conversion Mount Kit
• Vehicle Application: 1988–1991 Honda Civic / CRX
• Chassis Compatibility: ED / EE / EF
• Engine Compatibility: Honda K20-Series and Properly Configured K24-Series
• Transmission Compatibility: Specified K20-Style Hydraulic Manual Transmissions
• Original Chassis Transmission: Manual or Automatic
• Mount Construction: Steel
• Bushing Material: Performance Polyurethane
• Available Bushing Hardness Options: 75A / 85A / 95A
• Mounting Configuration: Three Engine/Transmission Mounts and Two Conversion Brackets
• Driver-Side Mount: Innovative Mounts 99110
• Passenger-Side Mount: Innovative Mounts 99120
• Passenger-Side Bracket: Innovative Mounts 99120-SB
• Rear Mount: Innovative Mounts 99130
• Rear Mounting Bracket: Innovative Mounts 99130-SB
• Required Welding: Yes
• Rear Subframe Modification: Required
• Hood Modification: Required
• K24 Engine Bracket Requirement: Honda 11910-PPA-000
• Engineering: CAD/CAM Designed and Stress Analyzed
• Mounting Hardware: Included
• Manufacturer-Listed Weight: Approximately 25 lbs
• Warranty: Manufacturer Lifetime Warranty, Subject to Terms

Available Polyurethane Bushing Hardness Options

75A – Black – Street / Performance

The softest available bushing option for the 99150.

Recommended for street-oriented Civic and CRX conversions where improved drivetrain stability is desired while retaining some vibration isolation.

Manufacturer horsepower guidance: approximately 250–400 HP.

85A – Grey – Performance / Race

Provides increased drivetrain rigidity for modified engines, aggressive driving, and competition applications.

Manufacturer horsepower guidance: approximately 400–500 HP.

95A – Red – Extreme Race

The stiffest available polyurethane option, intended for high-output engines and dedicated racing applications.

Manufacturer horsepower guidance: 500+ HP.

These horsepower ranges are manufacturer bushing selection guidelines rather than guaranteed load ratings or minimum horsepower requirements.

Important: Increasing bushing hardness generally increases noise, vibration, and harshness transmitted into the vehicle cabin. The 75A option is typically the most appropriate starting point for a street-driven Civic or CRX.

K20 vs. K24 Installation Requirements

K20 Engine Installation

The 99150 is designed around compatible K20 engine mounting provisions and specified K20-style hydraulic manual transmissions.

K24 Engine Installation

When using a K24 engine, Innovative Mounts requires the Honda K24A1 timing chain case/post mounting bracket:

Honda Part Number: 11910-PPA-000

The K24 must also be paired with a supported K20-style manual transmission.

Important: K24 transmissions are not compatible with the 99150 kit.

Required Chassis Modifications

The Innovative Mounts 99150 requires additional chassis preparation beyond a conventional engine mount replacement.

Weld-In Mounting Bracket

The supplied self-locating bracket must be welded to the chassis in the specified position.

Rear Subframe Modification

Modification of the rear subframe is required to accommodate the conversion.

Hood Clearance Modification

The hood must be modified to provide the necessary clearance for the K-Series engine installation.

Important: These modifications should be performed by an experienced engine swap fabricator. Incorrect mounting bracket positioning or poor welding can affect drivetrain alignment and vehicle safety.

Additional Components Required for a K-Series Swap

The Innovative Mounts 99150 addresses the engine and transmission mounting portion of the conversion. Additional components are needed to complete the swap.

Common supporting components include:

• Compatible Honda K20 or K24 engine

• Supported K20-style hydraulic manual transmission

• K-Series swap-compatible axles

• Compatible intermediate shaft

• Hydraulic clutch conversion components

• Manual transmission shifter assembly

• Shifter cables and mounting components

• K-Series engine wiring harness

• Chassis conversion wiring harness

• Compatible ECU or aftermarket engine management system

• K-Series swap-compatible radiator and cooling system

• Engine swap-compatible radiator hoses

• Appropriate fuel delivery system

• K-Series swap-compatible exhaust header

• Exhaust system modifications

• Throttle cable or electronic throttle conversion components, depending on engine

• Required engine accessory modifications

• Additional chassis fabrication and clearance modifications

Exact requirements depend on the engine, transmission, chassis configuration, and intended performance application.

Common Reasons for Replacement or Upgrade

• K-Series Engine Conversion: Provides the mounting components needed to install a compatible K-Series drivetrain.

• Modern Honda Engine Performance: Enables the use of K20 and properly configured K24 engines in classic Civic and CRX platforms.

• Factory Mount Incompatibility: Addresses the mounting differences between original D-Series and replacement K-Series drivetrains.

• Automatic-to-Manual Conversion: Supports compatible original automatic chassis being converted to a hydraulic manual drivetrain.

• Improved Drivetrain Stability: Performance polyurethane helps control excessive engine movement.

• Reduced Mount Deflection: Maintains more consistent drivetrain positioning during acceleration and shifting.

• Performance Engine Upgrades: Supports properly configured naturally aspirated and forced-induction K-Series builds.

• Track and Racing Applications: Provides increased mount rigidity for demanding driving conditions.

• Coordinated Conversion Mounting System: Includes three mounts and the two specialized brackets needed for the specified conversion.

Installation Notes

1. Verify Vehicle Compatibility: Confirm that the vehicle is a 1988–1991 Honda Civic or CRX with a supported ED, EE, or EF chassis.

2. Confirm Engine Selection: Verify that the selected K20 or K24 engine is compatible with the 99150 mounting configuration.

3. Confirm Transmission Compatibility: Use a manufacturer-approved K20-style hydraulic manual transmission. K24 transmissions are not compatible.

4. Verify K24 Mounting Requirements: If installing a K24 engine, obtain the required Honda 11910-PPA-000 timing chain case/post mounting bracket.

5. Prepare the Vehicle: Follow appropriate service procedures to remove the original engine, transmission, and related components.

6. Support the Vehicle: Safely support the chassis using appropriate lifting equipment before beginning fabrication.

7. Inspect the Chassis: Check mounting areas, frame rails, and surrounding structural components for corrosion, cracks, or previous repairs.

8. Prepare the Weld-In Bracket Location: Identify and prepare the specified chassis mounting location according to the manufacturer's installation instructions.

9. Install the Passenger-Side Weld-In Bracket: Position the Innovative Mounts 99120-SB self-locating bracket.

10. Weld the Bracket to the Chassis: Have the bracket professionally welded in the specified position using appropriate fabrication procedures.

11. Modify the Rear Subframe: Perform the required clearance modifications according to the manufacturer's installation instructions.

12. Install the Driver-Side Mount: Position the Innovative Mounts 99110 mounting component.

13. Install the Passenger-Side Mount: Position the Innovative Mounts 99120 mounting component.

14. Install the Rear Mount: Position the Innovative Mounts 99130 rear mounting component.

15. Install the Rear Mounting Bracket: Install the Innovative Mounts 99130-SB bracket.

16. Position the Engine and Transmission: Carefully lower the K-Series drivetrain into the engine bay and align the mounting components.

17. Verify Drivetrain Alignment: Check engine positioning, transmission alignment, axle geometry, and clearance around surrounding chassis components.

18. Modify the Hood: Provide the hood clearance required for the completed engine installation.

19. Install Mounting Hardware: Use the hardware supplied by Innovative Mounts and any additional hardware specified in the installation instructions.

20. Torque Mounting Fasteners: Follow the manufacturer's installation instructions and applicable service procedures.

21. Complete Supporting Modifications: Install the required axles, hydraulic clutch system, shifter components, wiring, cooling system, fuel system, and exhaust components.

22. Inspect Engine Bay Clearance: Verify adequate clearance around the engine, transmission, steering system, suspension, radiator, exhaust, and hood.

23. Check for Additional Vibration: Some increase in noise, vibration, and harshness is normal when using performance polyurethane mounts.

24. Perform a Final Inspection: Verify weld quality, mounting alignment, hardware security, and drivetrain clearance before operating the vehicle.

25. Recheck After Initial Use: Inspect the mounting system and related hardware after the initial driving period.

Important: Innovative Mounts advises that mounts showing bolt impressions from installation cannot be returned or exchanged. Confirm fitment before installation.

Professional installation by an experienced engine swap specialist or fabrication shop is strongly recommended.

What's Included

The Innovative Mounts 99150 K-Series engine conversion mount kit includes:

• 1 × Innovative Mounts 99110 Driver-Side Engine/Transmission Mount

• 1 × Innovative Mounts 99120 Passenger-Side Mount

• 1 × Innovative Mounts 99120-SB Passenger-Side Weld-In Bracket

• 1 × Innovative Mounts 99130 Rear Engine Mount

• 1 × Innovative Mounts 99130-SB Rear Mounting Bracket

• Performance polyurethane bushings in the selected hardness configuration

• Manufacturer-supplied installation hardware

Additional Information

This listing is for the K-Series conversion mounting system designed for compatible 1988–1991 Honda Civic and CRX chassis.

The following components are not included unless separately specified:

• Honda K20 or K24 engine

• Manual transmission

• Honda 11910-PPA-000 K24 engine bracket

• Hydraulic clutch conversion components

• Clutch and flywheel assembly

• K-Series swap axles and intermediate shaft

• Shifter assembly and cables

• Engine wiring harness or ECU

• Cooling system conversion components

• Fuel system conversion components

• Exhaust components

• Fabrication labor or additional chassis modifications

Verify all supplied components and required hardware against the manufacturer packaging and installation instructions.

Transform your fourth-generation Honda Civic or second-generation CRX with the Innovative Mounts 99150 Steel K-Series Engine Conversion Mount Kit, engineered specifically for 1988–1991 Honda Civic and CRX ED/EE/EF chassis.

Featuring durable steel construction, three primary drivetrain mounts, two conversion mounting brackets, CAD/CAM engineering, stress-analyzed components, and performance polyurethane bushings, the 99150 provides the specialized mounting solution needed for a properly configured Honda K-Series engine swap.

Whether you're building a naturally aspirated K20-powered CRX, developing a turbocharged K24 Civic, or preparing a dedicated drag racing, autocross, or road racing vehicle, Innovative Mounts delivers a purpose-built drivetrain mounting solution.