273 Commando with C.A.P.
This is close to the factory explanation.
Automotive History: Chrysler’s CAP, The First Effective Exhaust Emission Control (With ’63 Dodge and Dart Road Tests)
CAP was a number of things.
- The timing curve is very different than on non CAP cars. Initial is 5ATDC but comes on faster.
- The green gismo delays the timing return to initial for a second or so on deceleration.
- Air cleaner has a port on it to go to the breather (4bbl unsilenced air cleaner with CAP also has one)
- The carborator is jetted differently and the idle mixture screws are contained and can not be turned more than a small amount and if you try to remove them (without some "special" adjustment) you will break them
- Cooling system is heavier duty not quite HD or AC but more than standard cooling.
To the green gizmo takes manifold vacume and ported vacume. When manifold vacume is high as in deceleration the ported vacume stays high for a second or two. Then returns to full ported. On acceleration it has no effect on vacume advance.
If you want to keep the green gizmo but not use it just tighten the screw to tighten the spring. When it is tighten enough the gizmo is deactivated, never enough manifold vacume to overcome the spring pressure.
Cap booklet
16 new items by Dana Nance
