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Re: [GMCnet] Bought that new electric clutch for the engine fan. [message #324695 is a reply to message #324311]

Sun, 08 October 2017 08:40

JohnL455

Messages: 4447
Registered: October 2006
Location: Woodstock, IL

Karma:

Senior Member

The old factory set up tends to engage when you crest the hill because you lift throttle and the engine speed drops which toggles the engagement at or near threshold. If the hill were longer more severe it would (should) eventually engage but slightly later in time. If you lift and reopen throttle you can trick it to engage sooner if at or near engagement point. Howerver when pulling grade in the good RPM range you don't want to lift and drop below power curve so counter intuitive. Remember the clutch is thermal but also limits power transmission and max fan speed depending on temp. If there was a good supply of USA Delco parts this electric controled device adaptation would not have been driven by necessity. Good alternative way to go.
As far as coming on above 45 MPH -- yes they do that if need be in severe conditions. Theory is poor hot air flow exit at speed caused by high pressure getting up under the engine room. Back in 76 my friend had a new 76 L82 Corvette. Same issue. At cruise in hot weather the temp would creep higher, fan would engage for about 60 secs and pull temp back to stat point. This would repeat every few minutes at highway cruise. Not sure but perhaps same fan clutch part number? Attributed to poor natural air flow as no front grill and only bottom feeder design. Also the theory is constant cycling at road speed works the clutch hard as there is still speed differential and heat generated in the clutch that has to be disipated by the heat sink fins on the casting running in an already hot air stream.

John Lebetski
Woodstock, IL
77 Eleganza II

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[Message index]

		[GMCnet] Bought that new electric clutch for the engine fan. By: Thomas Pryor on Sun, 24 September 2017 16:11
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: jknezek on Sun, 24 September 2017 18:44
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Matt Colie on Mon, 25 September 2017 08:30
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: KB on Mon, 25 September 2017 10:28
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: KB on Sat, 07 October 2017 20:45
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: jhbridges on Mon, 25 September 2017 08:35
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: JohnL455 on Mon, 25 September 2017 08:50
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: SpookyEng on Mon, 25 September 2017 11:15
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: drdonaldg on Mon, 25 September 2017 12:05
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: johnd01 on Mon, 25 September 2017 14:29
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Richard Denney on Mon, 25 September 2017 15:47
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Justin Brady on Mon, 25 September 2017 16:25
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Justin Brady on Mon, 25 September 2017 16:27
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Matt Colie on Mon, 25 September 2017 19:22
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: johnd01 on Tue, 26 September 2017 04:16
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Richard Denney on Tue, 26 September 2017 05:45
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Justin Brady on Tue, 26 September 2017 07:41
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Jp Benson on Tue, 26 September 2017 08:04
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: jknezek on Tue, 26 September 2017 08:41
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Thomas Pryor on Thu, 26 October 2017 22:35
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: powerjon on Thu, 26 October 2017 23:02
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: powerjon on Thu, 26 October 2017 22:59
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: bdub on Fri, 27 October 2017 09:23
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Thomas Pryor on Fri, 27 October 2017 09:39
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Thomas Pryor on Fri, 27 October 2017 09:44
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: jhbridges on Tue, 26 September 2017 09:05
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: jhbridges on Tue, 26 September 2017 09:10
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: JohnL455 on Sun, 08 October 2017 08:40
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Ray Erspamer on Mon, 23 October 2017 18:40
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Jim Wagner on Wed, 25 October 2017 20:37
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: bdub on Wed, 25 October 2017 21:28
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: jimk on Wed, 25 October 2017 22:47
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: johnd01 on Thu, 26 October 2017 02:44
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: bdub on Thu, 26 October 2017 07:24
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: KB on Sat, 28 October 2017 16:09
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: Bill Van Vlack on Fri, 23 March 2018 13:11
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: jhbridges on Fri, 23 March 2018 16:33
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: jhbridges on Thu, 26 October 2017 08:52
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: jimk on Thu, 26 October 2017 18:11
		Re: [GMCnet] Bought that new electric clutch for the engine fan. By: jhbridges on Fri, 27 October 2017 08:17

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