McCulloch VS or VR Superchargers

McCulloch superchargers have long been synonymous with power and performance in the automotive world. Two of their iconic models, the VS and VR, have left an indelible mark on the industry. In this post, we’ll delve into the details of these superchargers, comparing their features, applications, and their impact on the performance enthusiast scene.

McCulloch VS and VR at a Glance

Aspect:McCulloch VS SuperchargerMcCulloch VR Supercharger
Introduction:Late 1930s to early 1940sLate 1940s to early 1950s
Type:Roots-type superchargerRoots-type supercharger
Applications:Classic cars, aircraft enginesClassic cars, military, marine, and aircraft engines
Key Features:Compact, efficient, belt-driven designImproved cooling, durability, and efficiency
Significance:Early pioneer in superchargingWidened applications and improved performance

Key Features of the McCulloch VS Supercharger

  1. Compact Design:
    • The VS supercharger, introduced in the late 1930s, featured a compact design suitable for various classic car applications.
  2. Belt-Driven Efficiency:
    • It operated using a belt-driven mechanism, utilizing engine power to compress air efficiently.
  3. Bypass System:
    • The VS included a bypass system for enhanced efficiency, preventing over-pressurization.
  4. Early Pioneer:
    • The McCulloch VS was one of the pioneering superchargers, helping to popularize forced induction in classic cars.

Key Features of the McCulloch VR Supercharger

  1. Improved Cooling:
    • The VR supercharger, introduced in the late 1940s, featured enhanced cooling mechanisms, making it more suitable for sustained use.
  2. Durability and Efficiency:
    • It was designed with durability in mind, with improved drive mechanisms and materials, ensuring longevity and efficiency.
  3. Widened Applications:
    • Unlike the VS, the VR found applications not only in classic cars but also in military vehicles, marine engines, and aircraft engines.

Applications of McCulloch VS and VR Superchargers

McCulloch VS:

  1. Classic Cars:
    • The VS supercharger was primarily used to boost the power of classic cars, particularly in the hot rodding culture of the mid-20th century.
  2. Aircraft Engines:
    • Some variations of the VS were adapted for use in aircraft engines, contributing to aviation performance.

McCulloch VR

  1. Classic Cars:
    • Like the VS, the VR supercharger continued to enhance the performance of classic cars, but with improved efficiency.
  2. Military Vehicles:
    • The VR supercharger found applications in military vehicles, contributing to their power and mobility.
  3. Marine Engines:
    • Marine enthusiasts also benefited from the VR’s reliability and power-boosting capabilities.
  4. Aircraft Engines:
    • The VR supercharger’s efficiency and cooling features made it suitable for various aircraft engines.


Both the McCulloch VS and VR superchargers have had a profound impact on automotive and other industries. While the VS blazed the trail as a pioneer in supercharging, the VR expanded its applications and improved efficiency, catering to a wider range of engines and vehicles. Together, they represent the enduring legacy of McCulloch’s commitment to power and performance enhancement in the world of mechanical engineering.