- Local time
- 6:00 AM
- Aug 3, 2020
- Reaction score
- Canton, OH
Pretty sure it just runs the fan and water pump faster.Damm,
Man Vac Adv [ MVA ] was around for years, used by GM until 1967-8. Not sure about Ferd & others. Then emissions forced the use of the USELESS PVA.
Chrysler, stupidly, chose not to use MVA during the performance years. That is why your AFB has the PVA port. MVA does not need a dedicated port [ but it often does ], it can be connected to a manifold runner or Tee-d into the brake booster line.
The paradox is that Ch was forced to use MVA in the 1970s when emissions raised engine temps. MVA would be switched on when temp reached 200+*......to cool the engine.
Folks should think about how/why MVA cools an engine....