TOMEI Adjustable Cam Gear | 4A-GE / 4A-GZE 16V (AE86 Corolla / AW11 MR2 / AE92 Corolla)

TOMEI Adjustable Cam Gear

For 1983–1987 Toyota Corolla AE86, 1984–1989 Toyota MR2 AW11, and 1987–1991 Toyota Corolla AE92 coupe equipped with 4A-GE / 4A-GZE 16V camshaft and timing-belt systems.

Overview

The TOMEI Adjustable Cam Gear provides precise valve-timing adjustment for 4A-GE / 4A-GZE 16V engines in 1983–1987 Corolla AE86, 1984–1989 MR2 AW11, and 1987–1991 JDM Corolla AE92 coupes and 1988–1991 U.S.-Market Corolla GT-S AE92 coupes. The pulley and gear use duralumin construction to reduce rotating mass while retaining the strength required for performance engine builds.

The gear uses a slide-type adjustment mechanism and is common to the intake and exhaust camshaft positions. Each gear weighs approximately 250 g.

Key Features

• Slide-type adjustable cam gear for fine valve-timing setup
• Duralumin pulley and gear construction
• Approximate component weight: 250 g
• Common intake / exhaust application
• ±10° cam-gear adjustment range with up to ±20° equivalent crank-angle timing adjustment
• Engraved adjustment scale for repeatable setup
• Available as a single gear or complete pair

Cam Timing Adjustment

The slide adjustment changes camshaft phase relative to the crankshaft. The effect on engine response depends on the camshaft and engine combination; the gear does not provide a guaranteed power increase.

The compatible HKS Fine Tune Timing Belt is available separately for a reinforced 16-valve timing-belt setup.

Vehicle Fitment

Toyota Corolla — AE86

• 1983–1987: Trueno (JDM) / 4A-GE 16V
• 1983–1987: Levin (JDM) / 4A-GE 16V
• 1985–1987: GT-S (U.S.-Market) / 4A-GE 16V

Toyota MR2 — AW11 / MK1

• 1984–1989: JDM / 4A-GE 16V
• 1985–1989: U.S.-Market / 4A-GE 16V
• 1986–1989: JDM Supercharged / 4A-GZE 16V
• 1988–1989: U.S.-Market Supercharged / 4A-GZE 16V

Toyota Corolla / Sprinter — AE92 — Coupe

• 1987–1991: Japanese-market Corolla Levin and Sprinter Trueno, 4A-GE / 4A-GZE 16V.
• 1988–1991: GT-S coupe (U.S.-Market) / 4A-GE 16V

Camshaft Position: Intake or exhaust on the listed 16-valve engine configurations.

Fitment Notes

• Engine-swapped vehicles require the compatible 4A-GE / 4A-GZE 16V camshaft and timing system; chassis identity alone does not establish fitment.
• Factory AE86 SR5 4A-C and AE92 SR5 4A-F / 4A-FE engines are not covered.
• For the listed 16-valve applications, not a complete 20-valve cam-gear setup.
• Intended for off-road competition use.

Product Specifications

Brand: TOMEI
Engine: 4A-GE / 4A-GZE 16V
Type: Slide-Type Adjustable Cam Gear
Material: Duralumin
Component Weight: Approx. 250 g
Adjustment Range: ±10° Cam Gear / ±20° Crank Angle
Position: Intake / Exhaust

Available Configurations

Choose one gear for a single camshaft or a pair for both camshafts.

Quantity

• Single Unit (1 Gear): (1) TOMEI adjustable cam gear for one camshaft.
• Complete Engine Set (Pair): (2) TOMEI adjustable cam gears for the intake and exhaust camshafts on the supported 16-valve engine.