Induction kits and Viper kits - Technical Information

150mm OD Rampipe Base

The Pipercross 150mm Outer Diameter base found on Pipercross Induction kits, Vipers, PX700 and Evolution is used to create laminar air flow.
Laminar air flow occurs when the air is flowing in the same direction and turbulence is kept to a minimum. Turbulence causes drag which slows the airflow down and limits the flow rate of any induction system.
Filter units without a full radius edge create turbulence, thus reducing their effectiveness.

Why Foam?

At the heart of the unique pipercross air filter is a specially developed polyurethane foam which acts as the filtration medium, having both higher performance and life expectancy than paper.

Pipercross reticulated foam is created by a chemical reaction, it is then placed in a gas filled combustion chamber where a controlled explosion burns away any complete cell walls in the material to form a skeletal cellular structure which is strictly quality controlled. This process, which is specified by Pipercross ensures that the foam consists of tiny open cells which trap contaminants.

The cell size of the foam, its porosity, is measured in Pores Per Inch (PPI). Pipercross air filters use up to six layers of foam with varying porosity descending in pore size in the direction of air flow.

The Pipercross filters long life span is due to the dirt storage capacity of the foam cells and the filters construction which means no air passage is blocked until all the cells in a layer of foam are completely filled. It is designed to hold contaminants in the filters outer layer, inner layers act as a secondary measure to ensure an exceptionally high level of engine protection.

The Viper

The technology used in the VIPER was first seen on the Lotus 340R, but Pipercross are making it available for an ever increasing range of popular road cars.
The VIPER uses ‘velocity air force 'to direct cold air directly into the engine.
The cold air feed takes air from behind the grill straight into the VIPER 's 100mm diameter inlet, swirling it through a unique Pipercross velocity filter contained within a carbon fibre heat shield, and then into a ram pipe to increase it 's pressure before feeding it into the induction system.

The carbon fibre heat shield protects the air charge from under bonnet heat keeping it cool -and therefore more dense -thus introducing more oxygen into the combustion mixture,giving increased power.

The physics involved may sound a little complicated but the increase in power using a VIPER against a standard air box will be immediately evident. Just as obvious will be the VIPER's stunning looks - the carbon fibre heatshield connecting the polished alloy inlet to the 150mm rampipe will be the focal point of any engine bay!