Posted By: nobrakesneeded
fan shroud questions - 03/19/11 08:34 PM
I had a small block (basically stock)built by a shop to install into my street rod. After about 1000 miles, the motor has developed a loud lifter knock upon start up and at speed after driving about 10 minutes.
When the motor was installed I had a single electric fan mounted to an aftermarket aluminum radiator. The single fan would not cool the motor in traffic so I added a second, both pullers. These fans were mounted to a sheetmetal shroud loosely based on a Be Cool setup I had seen on a blown big block car. The setup cooled the car as expected.
THe engine builder is convinced the fans and shroud are cooking the motor and wants a conventional motor driven fan and standard shroud installed before he commits to replacing the lifters under a very generous warranty.
What are your experiences with stock vs. aftermarket fan/shroud setups?
When the motor was installed I had a single electric fan mounted to an aftermarket aluminum radiator. The single fan would not cool the motor in traffic so I added a second, both pullers. These fans were mounted to a sheetmetal shroud loosely based on a Be Cool setup I had seen on a blown big block car. The setup cooled the car as expected.
THe engine builder is convinced the fans and shroud are cooking the motor and wants a conventional motor driven fan and standard shroud installed before he commits to replacing the lifters under a very generous warranty.
What are your experiences with stock vs. aftermarket fan/shroud setups?
. I would see what you have for preload on em & press down on each of the rocker arms (the pushrod side) w a wooden hammer handle while it's idling & see if you can isolate the bad one (or ones) (it'll get quieter). One or more of the lifters may have went bad but I'd check preload 1st