- theory

Flow simulations

A lot of R&D work has gone into the design prior to thorough testing.

Looking at the flow simulations shows that:

• The airflow at part throttle passes directly over the fuel injector.
• The roller barrel design has far less turbulence in the injector area compared to the butterfly valve.
• At full throttle the air restriction is 20% less compared to conventional ITB’s.

Tapered throttle body

from air horn to cylinder head

Tapered roller barrel throttle bodies

We designed these ITB's to extract optimal performance from your air-cooled Porsche 911 engine.

The roller barrel design has the following key advantages:

• There is no butterfly valve obstructing the airflow to the engine. 
• Not having the butterfly in the middle of the airflow,  allows the diameter of the ITB to be smaller, which gives higher air velocity and thus better filling.
• At partial open throttle, the air is flowing directly over the fuel injector giving excellent atomization of the air-fuel mixture.
• Fast throttle response due to short distance from barrel to inlet valve.

Construction

• Evenly distributed airflow over all throttle bodies due to high precision CNC machining.
• Easy synchronizion due to tight tolerances and few joints and connections.
• Robust construction to ensure durable synchronization, thus avoiding the need for ajustment over time.
• Throttle barrels are mounted in sealed ball bearings for durability and trouble-free operation.
• All sealings are with Viton O-rings  to prevent false air.
• Only quality bearings and rod-ends used including stainless fasteners.
• All parts machined from 6082-T6 aluminium, hard anodized gunmetal grey.