aldive
Elite In Memoriam
- Joined
- January 17, 2001
- Messages
- 24,667
- Reaction score
- 28
- Year, Model & Trim Level
- 1999 XLT
Eureka, my new 20% underdrive water pump pulley finally arrived ( after a backorder wait ).
My water pump is currently being underdriven due to the UDP/harmonic balancer (http://www.explorerforum.com/forums/showthread.php?t=151951&highlight=underdrive ); however, I had a hankering to further underdrive it in hope of further increasing gas mileage.
I obtained this pulley from Underdog Performance ( http://underdog-performance.com/index.html ). The pulley cost $90.00 to my door, and was red anodized aluminum. Its aluminum construction allows for less rotational mass.
Underdog is a great company with which to do business; extraordinary customer service and excellent communications. I highly recommend them.
To underdrive an accessory, its drive pulley needs to be larger in diameter than the stock pulley, as a result the underdrive water pump pulley is larger in diameter ( 6” ) than the stock Ford pulley ( 5 1/8" ).
The first step in the installation was to disconnect the negative battery terminal. After that, my Mac intake (http://www.explorerforum.com/forums/showthread.php?t=130982&highlight=mac+intake ) was removed. This was followed by the removal of the serpentine belt after rotating the drive belt tensioner counterclockwise with a 3/8” breaker bar. Next, the electric fan (http://www.explorerforum.com/forums/showthread.php?t=140251&highlight=electric+fan ) was removed and set aside. After that, access to the stock water pump pulley was gained. Next, the water pump pulley was detached by removing the 4 x 10 mm bolts and detaching the pulley. Air tools rendered this task painless.
The new underdrive water pump pulley was installed by reversing the removal process and torquing the bolts to 18 ft/lbs. A new serpentine belt ( Goodyear Gatorback 4060865 ) was required, After installing the belt, the electric fan and Mac intake were reinstalled. Finally, the battery was reconnected.
The motor was started and checked for any maladies; none were observed.
The motor was allowed to reach operating temperature and then the water temperature was monitored with my OBD II scanner ( http://www.autoxray.com/default.htm ). The water temperature at idle was 194-195 F ( idle temperature prior to this installation was 190-192 F with 75 F ambient temperature ). At 70 MPH, the water temperature was 190 F ( the water temperature at speed prior to the installation was 190-192 F; 75 F ambient temperature ).
Further, a test drive around town, in traffic at 75 F ambient temperature, showed no problems. The water temperature was 190 F except at idle where it was 194 F.
The installation took about 20 minutes. Removing/replacing the electric fan was the most time consuming component of the job.
Now that the underdrive pulleys (the water pump, and the UDP crank/harmonic balancer [ http://www.explorerforum.com/forums/showthread.php?t=151951&highlight=underdrive ]) have been installed and road tested, a 2000 mile trip ( to Atlanta and SC ) will be undertaken in the very near future to evaluate the pulleys synergistic performance and effect on gas mileage. Data will be reported.
I am still awaiting the backordered overdrive alternator pulley to arrive ( from http://underdog-performance.com/index.html ).
All things considered, I am very satisfied with these underdrive pulleys. Is a trip to the dyno in the plans? Only time will tell.
My water pump is currently being underdriven due to the UDP/harmonic balancer (http://www.explorerforum.com/forums/showthread.php?t=151951&highlight=underdrive ); however, I had a hankering to further underdrive it in hope of further increasing gas mileage.
I obtained this pulley from Underdog Performance ( http://underdog-performance.com/index.html ). The pulley cost $90.00 to my door, and was red anodized aluminum. Its aluminum construction allows for less rotational mass.
Underdog is a great company with which to do business; extraordinary customer service and excellent communications. I highly recommend them.
To underdrive an accessory, its drive pulley needs to be larger in diameter than the stock pulley, as a result the underdrive water pump pulley is larger in diameter ( 6” ) than the stock Ford pulley ( 5 1/8" ).
The first step in the installation was to disconnect the negative battery terminal. After that, my Mac intake (http://www.explorerforum.com/forums/showthread.php?t=130982&highlight=mac+intake ) was removed. This was followed by the removal of the serpentine belt after rotating the drive belt tensioner counterclockwise with a 3/8” breaker bar. Next, the electric fan (http://www.explorerforum.com/forums/showthread.php?t=140251&highlight=electric+fan ) was removed and set aside. After that, access to the stock water pump pulley was gained. Next, the water pump pulley was detached by removing the 4 x 10 mm bolts and detaching the pulley. Air tools rendered this task painless.
The new underdrive water pump pulley was installed by reversing the removal process and torquing the bolts to 18 ft/lbs. A new serpentine belt ( Goodyear Gatorback 4060865 ) was required, After installing the belt, the electric fan and Mac intake were reinstalled. Finally, the battery was reconnected.
The motor was started and checked for any maladies; none were observed.
The motor was allowed to reach operating temperature and then the water temperature was monitored with my OBD II scanner ( http://www.autoxray.com/default.htm ). The water temperature at idle was 194-195 F ( idle temperature prior to this installation was 190-192 F with 75 F ambient temperature ). At 70 MPH, the water temperature was 190 F ( the water temperature at speed prior to the installation was 190-192 F; 75 F ambient temperature ).
Further, a test drive around town, in traffic at 75 F ambient temperature, showed no problems. The water temperature was 190 F except at idle where it was 194 F.
The installation took about 20 minutes. Removing/replacing the electric fan was the most time consuming component of the job.
Now that the underdrive pulleys (the water pump, and the UDP crank/harmonic balancer [ http://www.explorerforum.com/forums/showthread.php?t=151951&highlight=underdrive ]) have been installed and road tested, a 2000 mile trip ( to Atlanta and SC ) will be undertaken in the very near future to evaluate the pulleys synergistic performance and effect on gas mileage. Data will be reported.
I am still awaiting the backordered overdrive alternator pulley to arrive ( from http://underdog-performance.com/index.html ).
All things considered, I am very satisfied with these underdrive pulleys. Is a trip to the dyno in the plans? Only time will tell.