General Category > Quadrajet Carb Talk and Tips

Rear air door opening vs CFM

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70GS455:
So I decided to do a little experiment. I rigged up my leaf blower as a makeshift flow bench. I attached my carb and added a pressure meter and cfm meter.I wanted to determine if there were any surprises in flow measurement vs how much the rear air door was allowed to open. And...no surprises. The more the door was opened the more it flows. My leaf blower is limited to about 450 cfm so that's as high as the reading would go.

77cruiser:
That's a worthy difference.

novadude:
How is air door opening measured?  From leading edge to back wall, or??

Kenth:
This:

novadude:
That's what I thought (air door opening drawing), however, the graph of results would indicate that the CFM is less with larger openings if measured that way (which doesn't make sense).

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