Air box parts

[Jan_280Z]

Hey mates

A few weeks ago I was able to score a pretty intact original airbox for my 620. A few questions. What are the two little metal tabs on the inside (pic included). Are they needed? Is there a way to take the little flap thing out, I want to clean the inside of it as its dirty as hell.

 

 

http://postimg.org/image/n5ea1lipt/

 

 

Thanks all

Jan

 

 

 

[ggzilla]

Nissan calls it the Air Cleaner

 

[datzenmike]

Both are temp controlled vacuum bleeds. One for idle control compensation and one controls the warmed air mix in the snorkel supplied by the stove pipe from the hot exhaust manifold. Don't loose them.... just vacuum around them.

[ggzilla]

Yes, the two doodads are part of the Nissan "Automatic Temperature-Control Air Cleaner" (A.T.C. Air Cleaner)

 

Temperature Controlled Air Cleaner has two effects:

 

* Prevent carburetor "icing" in cold weather (near freezing to below freezing). Markets otherwise without emission control requirements used a simple "summer/winter" manual lever on the air cleaner air intake snout

 

* Keep the carburetor air at a constant temperature. This way the carburetor can be more effective over a wide range of ambient (outside) air temperatures. This is sometimes called a "hot air" system. Nissan calls it "Automatic Temperature-Control Air Cleaner" (A.T.C. Air Cleaner)

 

Even non-emission models used heated air. Here is a JDM air cleaner with manual temperature switch:

 

The Automatic hot air system not only reduces pollution, but by ensuring the carburetor is fed a constant-temperature air it aids fuel economy as well. The carb can be tuned for slightly-lean cruising operation without be affected by cold temperatures. Only disable this system if you want maximum performance and are willing to re-jet the carburetor to match particular temperatures. Racers will re-jet for different days and track conditions.