How many of you have experienced excessive fan noise due to fan speed and what did you do about it?
I recently had help from KD swapping engine pulleys and brackets as part of a Vintage A/C retrofit. I've been running a stock 1968 OEM 18" fixed steel fan. When the water pump pulley was swapped from non-A/C type to the smaller A/C type, the fan speed increased as expected. What I wasn't prepared for when doing the first time test drive, is that when I romped on the Go pedal, the fan noise caused by the large increase in wind air velocity sounded like a jet plane taking off. It's a pretty loud whirring sound. After warming up the motor, driving for 20 min, then letting it idle for 5 min, the coolant temp at idle shows a marked improvement idling around 175-180F instead of the previous 195-210F. While this is great, I don't think I can drive the car like this all the time with all that extra noise.
Have any of you experienced this with a smaller pulley setup? I know I know - install louder exhaust! Turn up the radio!
KD suggested installing a thermal clutch fan (which I have, but haven't tried yet). I've got a re-pop 18" diameter steel 7-blade clutch fan from Bouchillon (although wondering if this fan metallurgy could suffer from similar self-destruct issues like the re-pop steel pulleys I've seen come apart, which is the reason in my pulley swap I used original steel pulleys instead of repops). To go with the fan I've got a Hayden thermal clutch. I know the basic premise of a clutch fan where at speed it will slow the fan down, but I'd like to hear from others who had high speed fan noise and if a clutch fan solved the issue?
I recently had help from KD swapping engine pulleys and brackets as part of a Vintage A/C retrofit. I've been running a stock 1968 OEM 18" fixed steel fan. When the water pump pulley was swapped from non-A/C type to the smaller A/C type, the fan speed increased as expected. What I wasn't prepared for when doing the first time test drive, is that when I romped on the Go pedal, the fan noise caused by the large increase in wind air velocity sounded like a jet plane taking off. It's a pretty loud whirring sound. After warming up the motor, driving for 20 min, then letting it idle for 5 min, the coolant temp at idle shows a marked improvement idling around 175-180F instead of the previous 195-210F. While this is great, I don't think I can drive the car like this all the time with all that extra noise.
Have any of you experienced this with a smaller pulley setup? I know I know - install louder exhaust! Turn up the radio!
KD suggested installing a thermal clutch fan (which I have, but haven't tried yet). I've got a re-pop 18" diameter steel 7-blade clutch fan from Bouchillon (although wondering if this fan metallurgy could suffer from similar self-destruct issues like the re-pop steel pulleys I've seen come apart, which is the reason in my pulley swap I used original steel pulleys instead of repops). To go with the fan I've got a Hayden thermal clutch. I know the basic premise of a clutch fan where at speed it will slow the fan down, but I'd like to hear from others who had high speed fan noise and if a clutch fan solved the issue?