Upgrade your fourth-generation Honda Civic or second-generation CRX with the Innovative Mounts B49150 Billet Aluminum B-Series Engine Conversion Mount Kit, designed for 1988–1991 Honda Civic and CRX applications using a compatible Honda B-Series engine and hydraulic manual transmission.

The B49150 provides a performance-oriented drivetrain mounting solution for enthusiasts converting their original D-Series-powered Civic or CRX to a B-Series engine with a later-style hydraulic transmission.

The 1988–1991 Civic and CRX are popular platforms for engine conversions because of their lightweight construction, responsive handling, and extensive aftermarket support. Installing a B16, B18, or B20 engine provides access to a broad range of naturally aspirated and forced-induction performance upgrades.

The Innovative Mounts B49150 features precision-machined billet aluminum mounting components combined with performance polyurethane bushings. This construction helps control excessive engine movement during acceleration, deceleration, and shifting while providing a distinctive engine bay appearance.

Unlike the Innovative Mounts B19150, which is intended for B-Series cable-operated manual transmissions, the B49150 is designed for a B-Series hydraulic manual transmission conversion.

Because 1988–1991 Honda Civic and CRX models originally used cable-operated clutch systems, converting to a hydraulic transmission also requires the appropriate clutch actuation components. The B49150 addresses the drivetrain mounting portion of the conversion but does not replace the need for a compatible hydraulic clutch conversion system.

Available in multiple polyurethane bushing hardness options, the Innovative Mounts B49150 is suitable for street-driven B-Series swaps, naturally aspirated performance builds, turbocharged applications, and dedicated motorsport projects.

Important: The B49150 is an engine conversion mount kit, not a complete B-Series swap package. Additional drivetrain, clutch, wiring, axle, and cooling system components are required.

Features

• 1988–1991 Honda Civic Compatibility: Designed for supported fourth-generation Civic applications.

• 1988–1991 Honda CRX Compatibility: Supports compatible second-generation CRX chassis.

• B-Series Engine Conversion: Designed for compatible Honda B16, B18, and B20 engines.

• Hydraulic Manual Transmission Compatibility: Intended for B-Series hydraulic manual transmission swaps.

• Billet Aluminum Construction: Provides a premium alternative to conventional steel conversion mounts.

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

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

• Reduced Mount Deflection: Maintains more consistent engine and transmission positioning under load.

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

• Purpose-Built Conversion Geometry: Designed to position the compatible B-Series drivetrain within the supported chassis.

• Multiple Bushing Hardness Options: Allows selection according to street or competition use.

• Performance-Oriented Design: Suitable for naturally aspirated and forced-induction applications.

• Cable-to-Hydraulic Swap Application: Supports drivetrain mounting when converting to a hydraulic B-Series transmission.

• Dedicated Chassis Fitment: Engineered for the supported 1988–1991 Civic and CRX platform.

Popular Performance Applications

1988–1991 Honda Civic B-Series Hydraulic Swaps

Provides the drivetrain mounting solution for compatible B-Series engines paired with later hydraulic manual transmissions.

1988–1991 Honda CRX Engine Conversions

Allows enthusiasts to build a B-Series-powered CRX using a compatible hydraulic transmission arrangement.

B16 VTEC Performance Builds

Suitable for naturally aspirated B16 engine conversions with upgraded intake, exhaust, and valvetrain components.

B18C GS-R and Type R Swaps

Supports compatible B18C engine and hydraulic transmission combinations.

B20 Engine Conversions

Provides a mounting solution for properly configured B20-powered Civic and CRX applications.

Turbocharged B-Series Builds

Helps control excessive drivetrain movement in modified forced-induction applications.

Street Performance Vehicles

Polyurethane bushings provide increased drivetrain control compared with conventional factory rubber mounts.

Autocross and Road Racing

Reduced mount deflection can help maintain consistent drivetrain positioning during acceleration, braking, and cornering.

Drag Racing Applications

Firmer mounting can help resist excessive engine movement during aggressive launches.

Additional Information

• Manufacturer: Innovative Mounts
• Part Number: B49150
• Product Type: Billet Aluminum B-Series Engine Conversion Mount Kit
• Vehicle Application: 1988–1991 Honda Civic / CRX
• Chassis Compatibility: Compatible ED / EE / EF Applications
• Engine Compatibility: Honda B-Series, Subject to Mounting Configuration
• Transmission Compatibility: B-Series Hydraulic Manual
• Mount Construction: Billet Aluminum
• Bushing Material: Performance Polyurethane
• Installation Type: Engine and Transmission Conversion
• Clutch System: Hydraulic Conversion Required
• Cable Transmission Alternative: Innovative Mounts B19150

Polyurethane Bushing Selection

Innovative Mounts performance mounting systems are commonly offered with several polyurethane bushing hardness options. Confirm the available B49150 configurations when selecting the kit.

60A – Street

A softer performance bushing option intended to provide improved drivetrain control while limiting additional vibration.

75A – Performance Street

A firmer option for modified street vehicles and occasional track use.

85A – Race

Designed for applications where greater drivetrain rigidity is preferred over passenger comfort.

95A – Extreme Race

A very firm polyurethane configuration intended for aggressive motorsport use.

Important: Increasing bushing hardness generally increases noise, vibration, and harshness transmitted into the vehicle. Select the appropriate configuration based on vehicle use and acceptable cabin vibration.

Innovative Mounts B49150 vs. B19150

Innovative Mounts B49150 – Hydraulic Transmission Conversion

• Designed for compatible B-Series hydraulic manual transmissions

• Intended for 1988–1991 Civic and CRX B-Series swaps

• Requires an appropriate hydraulic clutch conversion

• Billet aluminum construction

Innovative Mounts B19150 – Cable Transmission Conversion

• Designed for compatible B-Series cable-operated manual transmissions

• Intended for 1988–1991 Civic and CRX B-Series swaps

• Retains a cable-operated transmission configuration

• Billet aluminum construction

Important: These kits are intended for different transmission configurations and should not be treated as interchangeable.

Additional Components Required for a B-Series Hydraulic Swap

The B49150 addresses the engine and transmission mounting portion of the conversion. Depending on the chassis and selected drivetrain, additional components may include:

• Compatible Honda B-Series engine

• Compatible B-Series hydraulic manual transmission

• Cable-to-hydraulic clutch conversion system

• Appropriate clutch master and slave cylinder arrangement

• Hydraulic clutch line

• Compatible clutch and flywheel

• Required engine-side brackets

• Swap-compatible axles and intermediate shaft

• Compatible shift linkage and shifter assembly

• Engine wiring harness

• Chassis conversion wiring

• Compatible ECU or aftermarket engine management

• Cooling system components and radiator hoses

• Fuel system components

• Engine swap-compatible exhaust header

• Intake system and accessory clearance components

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

Common Reasons for Replacement or Upgrade

• B-Series Engine Conversion: Provides a specialized mounting solution for installing a B-Series drivetrain.

• Hydraulic Transmission Upgrade: Supports a compatible later-style hydraulic B-Series manual transmission.

• Performance Engine Builds: Suitable for naturally aspirated and turbocharged B-Series applications.

• Excessive Drivetrain Movement: Polyurethane bushings help control unwanted engine movement.

• Improved Drivetrain Positioning: Helps maintain consistent engine and transmission alignment under load.

• Wheel Hop Reduction: Reduced mount deflection may help minimize wheel hop.

• Billet Aluminum Appearance: Provides a premium engine bay upgrade.

• Track and Competition Use: Offers firmer mounting for demanding performance applications.

Installation Notes

1. Verify Chassis Compatibility: Confirm that the vehicle is a supported 1988–1991 Honda Civic or CRX.

2. Confirm Engine Compatibility: Verify that the selected B-Series engine and its engine-side brackets match the required mounting configuration.

3. Confirm Transmission Compatibility: Use a compatible B-Series hydraulic manual transmission.

4. Plan the Clutch Conversion: Install a suitable cable-to-hydraulic clutch conversion system. The original cable clutch arrangement cannot directly operate a conventional hydraulic clutch release system.

5. Inspect the Chassis: Check the factory mounting areas for corrosion, cracks, previous repairs, or modifications.

6. Prepare the Drivetrain: Install the required engine-side and transmission-side brackets before positioning the drivetrain.

7. Support the Vehicle: Safely support the chassis using appropriate lifting equipment.

8. Install the Mounting Components: Position the B49150 mounts according to the manufacturer's instructions.

9. Position the Engine and Transmission: Carefully lower the assembled drivetrain into the engine bay and align the mounting points.

10. Verify Mount Alignment: Ensure the mounts are not excessively preloaded or binding.

11. Inspect Axle Geometry: Confirm proper axle alignment and clearance through the required suspension movement.

12. Check Chassis and Accessory Clearance: Inspect the hood, radiator, exhaust, intake, accessory brackets, and surrounding components.

13. Install the Correct Hardware: Use the fasteners specified in the manufacturer's installation instructions.

14. Torque All Fasteners: Follow Innovative Mounts' instructions and applicable Honda service procedures.

15. Complete Supporting Systems: Install and verify the clutch hydraulics, shift linkage, axles, wiring, cooling system, and fuel system.

16. Inspect for Interference: Confirm that the engine and transmission do not contact surrounding components during normal drivetrain movement.

17. Perform a Final Inspection: Verify all mounting hardware, drivetrain clearances, and clutch operation before operating the vehicle.

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

Important: Engine swaps may require additional fabrication or chassis modifications depending on the exact drivetrain and vehicle configuration. Confirm the manufacturer's current installation requirements before beginning the conversion.

Professional installation by an experienced Honda engine swap specialist is recommended.

What's Included

The Innovative Mounts B49150 Billet Aluminum B-Series Engine Conversion Mount Kit includes the billet aluminum drivetrain mounting components supplied by Innovative Mounts for the specified hydraulic transmission conversion.

• Billet aluminum engine and transmission mounting components

• Performance polyurethane bushings in the selected configuration

• Any brackets or hardware supplied with the selected manufacturer kit

Important: Verify the exact individual mount part numbers, bracket contents, and hardware package against the current manufacturer listing before publishing a component-level inventory.

Components Not Included Unless Otherwise Specified

• B-Series engine

• Hydraulic manual transmission

• Hydraulic clutch conversion components

• Clutch and flywheel

• Axles and intermediate shaft

• Shift linkage

• Engine wiring and ECU

• Cooling and fuel system conversion components

• Additional engine swap components

Complete your fourth-generation Honda Civic or second-generation CRX B-Series conversion with the Innovative Mounts B49150 Billet Aluminum Engine Swap Mount Kit, designed for compatible 1988–1991 Honda Civic and CRX applications using B-Series engines and hydraulic manual transmissions.

Featuring billet aluminum construction, performance polyurethane bushings, and a drivetrain mounting configuration engineered for hydraulic B-Series transmission swaps, the B49150 offers a performance-oriented foundation for naturally aspirated, turbocharged, and competition builds.

Whether you're installing a B16 VTEC engine, upgrading to a B18C GS-R or Type R drivetrain, or building a B20-powered Civic or CRX, the Innovative Mounts B49150 provides a specialized mounting solution for your project.