- Joined
- July 5, 2003
- Messages
- 6,669
- Reaction score
- 63
- City, State
- Brockton, MA
- Year, Model & Trim Level
- '93 XLT 4x4
This Video shows what the lower airbox intake assembly looks like and how it operates.
After putting in my KKM cone filter I removed the lower intake assemble to prevent it from fast tracking water towards the air filter. The system is comprised of four basics parts: Engine vacuum, Bi-metal sensor, vacuum actuator, Air duct
Click thumbnail for larger picture
The Bi-metal sensor (not pictured, but located on top of the stock airbox) functions like a temperature switch either sending or cutting off engine vacuum to the vacuum actuator in the lower intake assembly.
When cold the Bi-metal sensor allows vacuum to pass through to the vacuum actuator. This allows air from the exhaust manifold to enter the air box while simultaneously closing off fresh air from the nozzle behind the bumper.
When warm the Bi-Metal sensor cuts off vacuum to the vacuum actuator. This allows fresh air from the Nozzle behind the bumper to entire the air box while simultaneously closing off hot air from the exhaust manifold.
After putting in my KKM cone filter I removed the lower intake assemble to prevent it from fast tracking water towards the air filter. The system is comprised of four basics parts: Engine vacuum, Bi-metal sensor, vacuum actuator, Air duct
Click thumbnail for larger picture
The Bi-metal sensor (not pictured, but located on top of the stock airbox) functions like a temperature switch either sending or cutting off engine vacuum to the vacuum actuator in the lower intake assembly.
When cold the Bi-metal sensor allows vacuum to pass through to the vacuum actuator. This allows air from the exhaust manifold to enter the air box while simultaneously closing off fresh air from the nozzle behind the bumper.
When warm the Bi-Metal sensor cuts off vacuum to the vacuum actuator. This allows fresh air from the Nozzle behind the bumper to entire the air box while simultaneously closing off hot air from the exhaust manifold.
Note: The vacuum actuator is a normally open. Therefore if the vacuum hose is removed/damaged it will keep the air vane open (allowing fresh air side to pass).