Air Injection

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Page created by T Jul 2nd 2008:

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Air Injection holes blanked off by grub screws on a factory EFI VK 3.3 Head. Image by 265Grunt. Click to Enlargen.

Air Injection:

Air Injection was fitted to 2850 powered Commodores and EST 3.3 VK Commodores. 
3.3 VK Head. Note the Air Injection holes above the exhaust ports. Image by Hiy_po. Click to Enlargen.
 
3.3 VK Head. Note the Air Injection holes above the exhaust ports. Image by Hiy_po. Click to Enlargen.
  

Operation:

An Engine driven Pump blew pressurised air through an anti blow back Valve into the Cylinder Head Exhaust Ports.The extra air provided by the Pump reduced exhaust emissions by burning off any unburnt fuel in the cylinder head exhaust ports.  The Pump was nicknamed a Smog Pump. 
EST VK Engine. Note the Air Injection Pipes. The anti-blow-back valve is at the bottom centre of the image. A Rubber Hose is connected to one side of it and a metal pipe is connected to the other. Air Injection Pipes are the small diameter exhaust pipes that are screwed into the Cylinder Head Exhaust Ports. Click to Enlargen. Photo by Tom1569.
 
EST VK Engine. The Engine driven Smog Pump is underneath the Top Radiator Hose and has the toothed V Belt connected to it. Click to Enlargen. Photo by Tom1569.
 
EST VK Smog Pump internal view. The rotating Vane draws air in and pushes it out to the Air Injection Ports via a Valve. Click to Enlargen. Photo by Tom1569.
 

Links:

Tom1569's Shed

Hiy_po's Shed

Terms:

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