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ran some test today
1. Put the old fan on the new shaft and impeller ran up the "hill" at 40 mph engine temp 184*
2. New fan on the new shaft and impeller up the "hill" same speed same spark advance and gav setting engine temp 199*
3. added water wetter same hill, speed, and settings engine temp 194*
the only difference I can see is the pulley on the new fan is narrower and the belt rides higher on it, then it does on the old pulley hence the fan and water pump turn at a slower speed.
the ambient temp was 83* for all three runs.
The belt width is .630 does anybody think a narrower belt might make a difference?
What should the belt width be?
Thanks Tim