2" SU Carb Hiff44 Ram Pipe Velocity Stack

2" Vortex Velocity Stack for SU HIF44 Carburettors

Unlock improved airflow from your SU HIF44 carburettor with the IPNG Automotive 2" Vortex Velocity Stack.

Designed with performance in mind and developed in accordance with the principles outlined in David Vizard's highly regarded A-Series engine tuning work, this velocity stack has been tested to provide an approximately 5.2% improvement in airflow over the standard A-Series setup.

The Vortex design combines a smooth bellmouth entry with integrated curved guide vanes, helping control the incoming airflow and reduce turbulence as it enters the carburettor.

Key Features

• Designed specifically for SU HIF44 carburettors
• 2" tall velocity stack design
• Tested to provide approximately 5.2% increased airflow over the standard A-Series setup
• Designed in accordance with principles from David Vizard's A-Series engine tuning work
• Smooth bellmouth entry helps reduce turbulence
• Integrated curved guide vanes help direct airflow into a controlled circular motion
• Designed to improve airflow into the carburettor
• Manufactured using high-temperature-resistant plastic
• 3D printed by IPNG Automotive
• Other sizes and lengths available
• Retains the original carburettor fixing arrangement

Application

The HIF44 is a popular 1¾" SU carburettor found across a wide range of classic British vehicles. This velocity stack is suitable for HIF44 applications including vehicles such as:

• Mini
• Jaguar
• Triumph
• MG
• Other classic British vehicles fitted with an SU HIF44 carburettor

Please confirm that your carburettor is an SU HIF44 before purchasing.

Product Information

The standard carburettor inlet can create turbulence and airflow restriction as air enters the carburettor. A properly designed velocity stack provides a smoother transition into the carburettor, helping air enter more efficiently.

The IPNG Vortex design takes this concept further by incorporating curved guide vanes within the inlet. These vanes help guide incoming air into a controlled circular motion, designed to improve the quality and efficiency of the airflow entering the carburettor.

The result is a velocity stack designed not simply to increase the available intake area, but to actively manage the airflow entering the HIF44.

Independent testing of this design has demonstrated an approximately 5.2% improvement in airflow over the standard A-Series setup.

The design has been developed with reference to the established A-Series tuning principles associated with David Vizard, making it particularly suited to enthusiasts looking to optimise the breathing characteristics of their classic A-Series engine.

Installation

Difficulty: ★☆☆☆☆
Estimated Time: 15–30 minutes

The velocity stack is designed to retain the original HIF44 carburettor fixing arrangement, making installation straightforward.

Remove the existing intake/filter arrangement, fit the velocity stack to the HIF44 using the original fixing arrangement and ensure everything is securely fastened before use.

What's Included

• 1 × 2" Vortex Velocity Stack for SU HIF44 carburettor

Important Information

Carburettor, manifold, air filter and other accessories are not included.

This listing is for one 2" Vortex velocity stack only.

This product is designed specifically for the SU HIF44 carburettor. Please confirm your carburettor type before purchasing.

Other Vortex velocity stack sizes and lengths are also available from IPNG Automotive.

Using an SU HS4, HIF38, HIF4 or H4 with a 35mm intake instead? Compare our 1.5" Vortex stack (IP-0045), 2" Vortex stack (IP-0044) and 2.5" Vortex stack (IP-0046) for the 35mm SU fitment.

IPNG Part Number

IPNG SKU: IP-0010

Why Choose IPNG Automotive?

At IPNG Automotive, we specialise in developing performance-focused and OEM+ components for enthusiast vehicles, combining modern manufacturing techniques with proven principles from traditional engine tuning.

Our aim is to develop practical performance products that provide measurable improvements while remaining suitable for the classic vehicles they were designed for.

Vortex Fitment & Selection Guide

Not sure which Vortex stack is right for your carburettor? Use our Vortex velocity stack fitment & selection guide to compare carburettor fitment, intake or bore size, stack height and IPNG part number.