Zed Head Posted February 17, 2023 Share #109 Posted February 17, 2023 The clutch gets stiffer as it heats up. The fan doesn't need to push much air on a cold engine. 1 Link to comment Share on other sites More sharing options...
chaseincats Posted February 18, 2023 Author Share #110 Posted February 18, 2023 9 hours ago, Zed Head said: The clutch gets stiffer as it heats up. The fan doesn't need to push much air on a cold engine. That's the strange part, the most air the fan ever blows is when the car is first starting Link to comment Share on other sites More sharing options...
siteunseen Posted February 18, 2023 Share #111 Posted February 18, 2023 See how many rounds you can spin the fan by hand when it's cold. I can't get one complete rotation on mine. I found the restore clutch from Blue's Tech Tips. It's a download now, the original site is unavailable. FAN 280zx Datsun rebuild fan clutch (1).pdf 1 Link to comment Share on other sites More sharing options...
chaseincats Posted February 18, 2023 Author Share #112 Posted February 18, 2023 3 minutes ago, siteunseen said: See how many rounds you can spin the fan by hand when it's cold. I can't get one complete rotation on mine. I found the restore clutch from Blue's Tech Tips. It's a download now, the original site is unavailable. FAN 280zx Datsun rebuild fan clutch (1).pdf 316.72 kB · 1 download Just gave it a shot and when its cold I can spin it about a quarter turn which seems pretty good. That said, when it's warm I'm able to spin it considerably more than that, shouldn't the opposite be true because it's supposed to grip harder to move more air when warm? 1 Link to comment Share on other sites More sharing options...
Zed Head Posted February 19, 2023 Share #113 Posted February 19, 2023 It might be bad. Don't forget that fan only matters at low vehicle speeds. 1 Link to comment Share on other sites More sharing options...
chaseincats Posted February 19, 2023 Author Share #114 Posted February 19, 2023 15 hours ago, Zed Head said: It might be bad. Don't forget that fan only matters at low vehicle speeds. So while driving, if the fan was directly connected to the engine instead of through a clutch for example, cooling performance wouldn't really change all that much? 1 Link to comment Share on other sites More sharing options...
Mark Maras Posted February 19, 2023 Share #115 Posted February 19, 2023 I understand the logic in having the fan clutch heat actuated BUT I think it would have been an improvement to have the fan clutch only actuated when the vehicle slowed below 10 mph.. As Zed Head stated "The fan only matters at low (or no) vehicle speed. Link to comment Share on other sites More sharing options...
siteunseen Posted February 20, 2023 Share #116 Posted February 20, 2023 I don't know how but mine blow with the motor rpm's until the thermostat opens. I crank them at least once a month holding at 2,000 inside the garage, the fan gets quiter and then I see coolant flowing across the top of the radiator. This is something you guys already talked about I'm guessing but I finally read what explains it to me in simpleton speak. 1 Link to comment Share on other sites More sharing options...
Yarb
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