AMR500 Supercharger Technical Hub

Specifications, Engineering Data, and Induction Architecture for Small Displacement Forced Induction

The Aisin AMR500

The Aisin AMR500 is a roots-type positive displacement supercharger designed primarily for small-displacement internal combustion engines ranging from 0.8L to 1.6L. Utilizing a dual-lobe rotor configuration, the unit provides instant, linear boost response without the lag associated with exhaust-driven turbochargers, making it an ideal choice for custom automotive and motorcycle restomod conversions.

Factory Reference Data

Precise engineering specs are critical when designing pulleys, calculating drive ratios, or configuring draw-through and blow-through carburetor induction systems.

Displacement 500 cc / revolution
Rotor Geometry Straight 2-Lobe Roots Configuration
Rotation Direction Clockwise or Counter-Clockwise (Bi-directional design)
Factory Oil Capacity 130 ml (Nominal)
Maximum Continuous RPM 16,000 RPM Max Safe Speed

AMR500 Installation & Mounting Guidelines

Successful integration of the Aisin AMR500 requires precise mechanical alignment and robust sealing to prevent parasitic power loss or destructive lean conditions.

1 Drive Belt Alignment & Tension

  • Pulley Planar Alignment: Ensure the supercharger pulley is aligned within ±0.5mm of the crank pulley. Angular misalignment causes rapid belt wear and parasitic bearing loads.
  • Belt Wrap: Aim for a minimum of 180° of belt wrap around the pulley to prevent slip under peak boost. Use an idler pulley on the slack side if tracking space allows.

2 Manifold Sealing & Gaskets

  • Inlet/Outlet Flanges: Use high-grade fuel resistant gaskets. Because draw-through configurations pull fuel-air mixtures through the rotors, downstream leaks create dangerous unmetered vacuum gaps.
  • Torque Specs: Tighten casing mounting bolts evenly in a cross-pattern to 11–12 Nm (8–9 lb-ft) to avoid distorting the aluminum housing.

3 Draw-Through vs. Blow-Through Architecture

Draw-Through (Carbureted Preferred): Places the carburetor before the supercharger inlet. The AMR500 draws the premixed air/fuel charge directly. Ensure fuel-safe gaskets are used.
Blow-Through: Places the supercharger upstream of a pressurized carburetor enclosure. Requires a fully sealed carb hat and reinforced independent floats to prevent structural collapse under positive pressure.

Solving Induction Constraints: Trumpet Filtration

When running custom draw-through carburetor induction manifolds on an AMR500 system (such as Weber, Dellorto, or SU variants), engine bay clearance limits standard bulky filter housings. Running unshielded velocity stacks or open trumpets risks catastrophic engine damage from debris ingestion.

Standard coarse foam options (like typical 20R materials) do not provide adequate micron-level particulate arrestance for performance builds, while paper elements restrict optimal volumetric flow.

High-Performance Foam Carburetor Filters

Engineered specifically to solve packaging constraints on custom supercharged builds, providing unobstructed high-volume airflow alongside strict particle containment.

  • Premium Material Profile: Specialized Grade S28/60R open-cell technical foam
  • Optimal Density Matrix: Nominal density calibrated to exactly 28 kg/m³
  • Calibrated Pore Architecture: Cell count of 25 ± 8 pores per linear inch for premium filtration velocity
  • Engineered Fit: Designed for 40-60mm diameter velocity stacks and intake trumpets
  • Structural Integrity: Single-layer closed-end cylinder design for absolute sealing
  • Fuel & Chemical Resistance: Fully stabilized matrix engineered to withstand continuous exposure to atomized fuel, oil vapors, and methanol blends without degrading or swelling
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