45 replies to this topic

[DarkHand]

i still dont' know what's in that black box. i've opened it up and read the hayes and chiton manuals and there's nothing in those that explains what the 2 pieces in there do.

any one know?

<{POST_SNAPBACK}>

The emmisions boxes are basically vacuum-based logic gates. They're Honda's way of adding an emmisions computer without the expense (in 1986) of adding in a computer to their lower-line DX and HF models. The boxes control all the various aspects of the emmisions systems that are built into the car.

Just an example: 'If such and such a sensor is on, and RPM is > 1500, and thermovalve B is open, then provide vacuum to hose A which disables the power valve in the carb'

Pretty much what a computer would do to manage emmisions, but without the expense and complexity (relative to the electronic equivalent in 1986) of a computer controlled system.

Edited by DarkHand, 13 July 2006 - 09:57 AM.