[60sstuff]

Dan,

I’m thinking it was a 70’s thing in California.
In order to pass smog you needed to attach this ugly item under the hood and connect as instructed on the box.

I saw many of these back in the day and I have this nice example from years gone by.

My ‘66 still shows the outline of this decal on the inside of windshield.
I found an old decal years ago and temporarily glued it to the outside as an example.
Also found several new ones on line too.

Chris

[60sstuff]

Ugly back then, but kinda cool today.

[DANTIP]

Originally Posted by 60sstuff

Dan,

I’m thinking it was a 70’s thing in California.
In order to pass smog you needed to attach this ugly item under the hood and connect as instructed on the box.

I saw many of these back in the day and I have this nice example from years gone by.

My ‘66 still shows the outline of this decal on the inside of windshield.
I found an old decal years ago and temporarily glued it to the outside as an example.
Also found several new ones on line too.

Chris

Chris,

I was hoping you would have knowledge of this! Of course you had a NOx box tucked away in your amazing parts stash!! Here is a document I just received via email on the topic. It is reportedly from a vintage California State Police vehicle inspection manual.

[mgarblik]

That is some crazy cool stuff there!! As a former EPA emissions instructor, I would love to know what was in that box and what it was supposed to do and how? The only practical way to reduce NOX in those days was to reduce combustion temperature. Running an engine rich would accomplish this but drive HC and Co emissions up. Very interesting, Thanks for sharing.

[gto4ben]

Originally Posted by mgarblik

As a former EPA emissions instructor, I would love to know what was in that box and what it was supposed to do and how?

The internals consist of a 555 timer, op amp, transistors, solenoid valve. capacitors and resistors. The 555 timer senses the RPM and triggers a signal to activate the solenoid valve which closes vacuum port to the distributor vacuum advance canister. Below the set RPM, it bleeds vacuum from the atmosphere to disable the canister operation. The setup is not unlike the 70-72 TCS system.

If anyone has the instruction manual for the Electro Nox, please scan and post it. I'm interested in what Air Quality Products recommend for the RPM setting, similar to what the Carter 5600X instruction say.