OEM plastic cold air intake tube

[SWFL]

Are they hard to find now? Is it common for them to degrade or is the plastic used pretty durable? What do they usually sell for? Do they just pop into the hole in the radiator core support between the headlight and radiator?

[datzenmike]

Very durable, cost???, pushes onto air horn and radiator support.

 

https://ratsun.net/classifieds/category/9-datsun-parts/

 

 

[SWFL]

So, is it one piece from the radiator support to the air cleaner or does it mount into a short ( plastic? ) piece that's attached to the radiator support?

[bilzbobaggins]

I believe there is a piece that is riveted to the core support.  Been a minute since I had a 620.

[datzenmike]

Up to and through '75 there is a part with 3 screws on the radiator support that the round cold air hose pushes onto and is clamped. In front of this is a small baffle to prevent direct entry of rain and dirt. The cold air hose is pleated and becomes more oval and attaches to the air horn on the air filter, also with a spring clamp.

 

After '75 the front of the cold air tube is shaped such that it half turn twisted into the radiator support to secure it.

 

The engine carburetor settings are made with the ATC (air temperature control) working to maintain the inlet air temperatures at about 100F. This is achieved by mixing warmed air from the hot exhaust and cooler ambient air from in front of the radiator support. If the cold air tube is missing only hot engine compartment air is available.

 

100F air assures best fuel vaporization and mileage, for the most part the engine 'thinks' it's summer all year round and runs accordingly even in the dead of winter making carburetor icing impossible. While 100F air is not the best for performance the ATC uses engine vacuum to operate the spring loaded servo on the air filter snorkel and at full throttle the intake vacuum is so low it closes off the hot air and only pulls 'cold' air from in front of the radiator for best performance.