Underdrive Pulley | 4" Double Groove | 20R/22R/22RE/22RTE
Unleash Hidden Horsepower: High-RPM Billet Underdrive Pulleys
Transform your engine’s efficiency with our precision-engineered underdrive pulley system. By strategically slowing down front-belt accessories, this design minimizes rotational resistance, allowing your engine to reclaim lost power and rev more freely. Crafted from premium billet aluminum, these pulleys trade heavy, parasitic factory components for lightweight, high-performance hardware.
Engineering Excellence & Weight Reduction
The cumbersome factory steel harmonic balancer weighs in at 5 lbs with a 6" diameter. Our CNC-machined 6061-T6 American billet aluminum alternative shatters those specs, weighing a mere 1 lb with a compact 4" diameter.
- Integrated Precision: Features a laser-etched degree wheel on the front face, enabling you to pinpoint Top Dead Center (TDC) with ease.
- Thermal Management: At high RPMs, overdriven water pumps can actually lose efficiency. This pulley optimizes water pump and alternator speeds to maintain superior cooling and reduce drag.
- Hard-Anodized Finish: Built for the track, each unit is hard-anodized for extreme wear resistance and lasting durability.
Technical Specifications: Double Groove
This Double Groove model is specifically configured for high-output builds utilizing:
- Alternator
- A/C (or custom belt-driven accessory)
- Essential Installation Components
- Compatibility Note: This model is not compatible with power steering.
-For single or triple groove options, please reference Part number: 1016104 or 1016105
To ensure a professional-grade install, we recommend pairing this pulley with the following:
| Component | Part Number | Purpose |
| Crankshaft Oil Seal | 1015042 | Prevent leaks during assembly |
| Adjustable Timing Tag | 1016117 | Required for degree wheel utility |
| Complete Kits | 1016120+ | All-in-one performance solutions |
IMPORTANT USAGE REQUIREMENTS:
- Application: Strictly intended for high-RPM race applications.
- Restrictions: This product is not recommended for daily-driven street vehicles or rock crawlers where low-speed accessory torque is vital.
| Note: Images are for illustration purposes only. Images may not represent the product listed. Please contact customer service with any questions or concerns: 1-928-505-2501. |
- 1975-1980 20R 2.2L Engines
- 1981-1995 22R 2.4L Engines
- 1983-1995 22RE 2.4L Engines
- 1985-1988 22RET 2.4L Engine
- Timing Tag Modification: The factory timing tag on the oil pump must be trimmed to provide adequate belt clearance. To maintain timing accuracy, we recommend installing the LCE Adjustable Timing Tag (Part number: 1016117).
- Seal Maintenance: Since the front crankshaft seal rides directly on the pulley surface, we highly recommend replacing the crankshaft oil pump seal during this upgrade.
- Lubrication: Apply a light coat of fresh motor oil to both the seal and the pulley’s sealing surface before installation.
- Crankshaft Key: Verify that the woodruff key is properly seated and in excellent condition before sliding the pulley into place.
To open a printable PDF version of this instruction CLICK HERE
Installation Guide: LCE 4" Underdrive Crankshaft Pulley:
For a successful installation, LC Engineering strongly advises consulting a factory service manual. If you encounter any issues or have technical questions, please contact our tech line at 928-505-2501.
While the 4-inch underdrive pulley installs similarly to the stock unit, specific modifications are required for proper clearance:
