Viscous clutch fan

Post by: **h20hamelan** » Sat Jul 20, 2019 2:05 pm

a Volvo red block fan seems to fit, it pulls more air too.
i drive at speed all the time, but...
and i haven't upgraded the electrical yet, and i suppose the viscous might look cleaner. Also, I don't care for front mounted pusher fans as they block too much airflow?

Post by: **bitsobrits** » Sat Jul 20, 2019 2:18 pm

I would avoid hanging any kind of mechanical fan off the front of the water pump. With no fan and a properly adjusted fan belt (not too tight) water pump bearings can lead a decently long life. With a heavy viscous fan I believe you would be shortening the life of the notoriously undersized pump bearings.

Post by: **h20hamelan** » Sat Jul 20, 2019 3:36 pm

ah, right. good point

Post by: **Fred Talmadge** » Sat Jul 20, 2019 8:13 pm

I have a 2 bladed fan, as I heard that you should have some load on the pulley to keep the bearing from skipping.

Post by: **StressCraxx** » Sat Jul 20, 2019 8:41 pm

Fred Talmadge wrote:I have a 2 bladed fan, as I heard that you should have some load on the pulley to keep the bearing from skipping.

Hello Fred,

I think that's a reasonable concern, but I think the belt tension provides enough load on the WP bearing to prevent ball/roller skid. If the bearing was skidding, it would fail in a matter of days/weeks.

Regards,
Dan Wise

Viscous clutch fan

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