O.S. Engine OS42581300 70R FSa-155-P Streamlined Air Funnel for Nitro Engines  [OS42581300]

Streamlined air funnel for nitro setups

This O.S. Engine air funnel is an RC-scale intake accessory designed to fit inline with nitro engine carburettor inlets and help manage airflow into the engine. It is intended for model use only and described here in technical terms relevant to hobby workshop tuning.

To install, position the funnel against the carburettor inlet and use the existing clamp points or manifold flange to secure it. Confirm a firm seal to avoid unmetered air and check that the funnel orientation does not obstruct linkages or the throttle arm. Tighten fasteners evenly and avoid excessive torque.

When tuning, expect the funnel to influence low to mid-range throttle feel by smoothing incoming air. This can make needle adjustments more predictable and reduce sudden surges. Routine checks for blockage and seal integrity will keep performance consistent.