Lotus Elan

Viscous clutch fan

PostPost 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?
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PostPost 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.
Steve

Elan S1 1963-Bourne bodied
Elan S3 1967 FHC pre airflow

Formerly:
Elan S1 1964
Elan S3 1966 FHC pre airflow
Elan S3 1967 FHC airflow
Elan S4 1969 FHC
Europa S2 1970
Esprit S2 1979
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PostPost by: h20hamelan » Sat Jul 20, 2019 3:36 pm

ah, right. good point
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PostPost 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.
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PostPost 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
There is no cure for Lotus, only treatment.
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