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

Precision intake funnel for nitro engines

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.

Installation is straightforward: mount the funnel to the carburettor inlet using existing clamp points or manifold seating, check for secure sealing to avoid air leaks, and confirm the alignment does not interfere with surrounding components. Use standard hand tools and keep fasteners snug but not over-torqued to protect the carburettor body.

In practical tuning, an air funnel like this primarily affects the intake flow pattern and throttle response. It can smooth transitions across the throttle range and reduce turbulence entering the carburettor, which helps when setting high- and low-speed needles and trimming mid-range behaviour. Regular inspection for wear and clear passages is recommended.