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Secondary Air Valve Weights

Optimises secondary actuation to maximise acceleration and prevent engine from stalling

Impulse secondary air valve weights are made from brass and are much heavier than the standard steel weights. The heavy brass weights MUST be used in 4BBL Carter and Edelbrock carburetors to,

  1. Maintain a high air velocity through the carburetor during secondary actuation for faster acceleration.
  2. Prevent the powerful vacuum produced by Negative Pressure Supercharging from suddenly opening the air valve and stalling the engine during full throttle.

Therefore, DO NOT use the standard steel weights, they are too light which will cause the engine to stall during full throttle.


Please select one of the following options on the order form

Option 1 - Secondary Air Valve Weights (2 weights only)
This requires removing the standard steel weights from the secondary air valve assembly and welding the heavy Impulse brass weights onto the shaft. The Impulse brass weights must be welded in a critical position or the weights may bind on the carburetor body and prevent secondary actuation.

Option 2 - Secondary Air Valve Assembly (exchange)
Australian Customers
Send us your secondary air valve assembly in good condition and we will replace the steel weights with the heavy Impulse brass weights. DO NOT send us your secondary air valve assembly if the air valve or shaft is damaged or modified. Locate another air valve assembly with the air valve and shaft in good condition. If ONLY the steel weights are damaged or modified and the air valve and shaft is in good condition, we will accept the air valve assembly.

USA and Canadian Customers
Send your secondary air valve assembly to our US Distributor.

Impulse Engine Technology P/L

PO Box 986 Randwick NSW 2031 Australia
Ph: (02) 9398 5544
Fax: (02) 9398 5644

International: Ph: +(612) 9398 5544
Fax: +(612) 9398 5644

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Inventor of Negative Pressure Supercharging

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