A Leader in Silencing for Industry

All internal combustion engines have high unsilenced noise levels that are broad band in nature but many have dominant frequencies based on the firing order, and engine cycle (2 vs 4) 2-cycle engines are normally less noisy than an equivalent horse power 4-cycle engine. In general the noise level increases with horsepower and RPM.

The major sources of engine noise in order of magnitude are:

• Exhaust (including radiated sources such as expansion joints and pipes)

• Intake (including turbo-charger, air filter, etc.)

• Mechanical casing (radiated from the engine structure)

The engine manufacturer can provide intake and exhaust unsilenced noise data, or there are various empirical calculation methods available.

Silencer velocity is determined by the flow rate (ACFM), temperature, or engine displacement.

Large horsepower, low speed engines (i.e. 5000 HP, 400 RPM) frequently require a larger silencer than velocity and pressure drop optimization indicate. This is due to the pulsation effect on intake and exhaust piping. A "slug volume" analysis may be required (consult factory) to evacuate this condition.

VANEC stocks several silencer sizes and styles for  ™Ajax® engines.

• Expansion joints

• Rain caps

• Acoustic / Thermal jackets

• Backfire relief covers