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oldcorollas Forums Junkie Location: Kita-Ku, Sapporo, Japan Registered: January 2003	Re: Davies Craig fans Fri, 24 September 2004 06:25 boxh34d wrote on Fri, 24 September 2004 14:06 and do we actually know why that is shinny??? i have heard this many a time, but i am yet to hear of why... does anyone know?? is it purely because of the fact that clutch fans usually have a good shroud design, or because it is unlikely that they will fail or what is it?? simple. an engine mounted fan will move more air than an electric fan of similar size. look at the blades of the engine fans, they are huge compared to the electric fans. BUT and engine fan, by moving more air, uses more power.. it is a parasitic power loss on the motor. this loss increases as a function of the square of the rpm (loss is proportional to rpm^2) now put on electric fan. doesn't work as well, but doesn't have direct parasitic loss on motor when it revs high. so you feel like you have more power (and you do!). but the electric fan also uses electricity via battery and puts parasitic drain on the alternator. BUT this is not as much drain as the engine fan (since it's moving less air) so you still have more power available than with an engine fan.. then if you add a clutch to the fan. at low engine speeds, fan spins at engine speed (pulley speed), and clutch doesn't slip. as engine revs increase, the power required to move the fan increases, increasing load ont he motor. at some point, the clutch slips, and the engine can still rev more, bt the fan speed doesn't increase proportionally to the engine speed... the lower the fan speed, the lower the losses. this lower fan speed is fine as it's still moving a shiteload of air, and is enough to keep radiator cool.. always keep in mind that above 40-50km/hr, the fan isn't helping much, car/airspeed is what cools the radiator then... anyway... Cya, Stewart [Report message to a moderator]

	Subject	Poster	Date
	Davies Craig fans	Cool1	Thu, 16 September 2004 04:34
	Re: Davies Craig fans	rob_RA40	Thu, 16 September 2004 04:37
	Re: Davies Craig fans	Danners	Thu, 16 September 2004 04:38
	Re: Davies Craig fans	Cool1	Thu, 16 September 2004 04:43
	Re: Davies Craig fans	people100	Wed, 22 September 2004 11:14
	Re: Davies Craig fans	mrshin	Thu, 23 September 2004 13:27
	Re: Davies Craig fans	boxh34d	Fri, 24 September 2004 04:06
	Re: Davies Craig fans	oldcorollas	Fri, 24 September 2004 06:25
	Re: Davies Craig fans	boxh34d	Fri, 24 September 2004 07:55
	Re: Davies Craig fans	justcallmefrank	Fri, 24 September 2004 08:02
	Re: Davies Craig fans	oldcorollas	Fri, 24 September 2004 08:04
	Re: Davies Craig fans	ke382TG	Thu, 16 September 2004 05:15
	Re: Davies Craig fans	Cool1	Thu, 16 September 2004 05:25
	Re: Davies Craig fans	ed_ma61	Thu, 16 September 2004 05:27
	Re: Davies Craig fans	ed_ma61	Thu, 16 September 2004 05:28
	Re: Davies Craig fans	Cool1	Thu, 16 September 2004 05:37
	Re: Davies Craig fans	Satoshi	Thu, 16 September 2004 05:57
	Re: Davies Craig fans	SupraPete	Thu, 16 September 2004 10:25
	Re: Davies Craig fans	Cool1	Thu, 16 September 2004 10:34
	Re: Davies Craig fans	V8_MA61	Thu, 16 September 2004 11:12
	Re: Davies Craig fans	draven	Thu, 16 September 2004 11:27
	Re: Davies Craig fans	Cool1	Thu, 16 September 2004 11:28
	Re: Davies Craig fans	sated	Tue, 21 September 2004 19:37
	Re: Davies Craig fans	Cool1	Tue, 21 September 2004 21:51
	Re: Davies Craig fans	moo4AGZETA22	Tue, 21 September 2004 23:48
	Re: Davies Craig fans	Cool1	Wed, 22 September 2004 00:30
	Re: Davies Craig fans	moo4AGZETA22	Wed, 22 September 2004 00:50
	Re: Davies Craig fans	oldcorollas	Wed, 22 September 2004 01:23
	Re: Davies Craig fans	sated	Thu, 23 September 2004 08:13
	Re: Davies Craig fans	ke382TG	Wed, 22 September 2004 00:58
	Re: Davies Craig fans	Azrael	Wed, 22 September 2004 01:04
	Re: Davies Craig fans	sated	Thu, 23 September 2004 08:15
	Re: Davies Craig fans	justcallmefrank	Fri, 24 September 2004 04:11
	Re: Davies Craig fans	ra23celica	Fri, 24 September 2004 05:54
	Re: Davies Craig fans	Bugman	Fri, 24 September 2004 06:04
	Re: Davies Craig fans	justcallmefrank	Fri, 24 September 2004 08:23
	Re: Davies Craig fans	Cool1	Fri, 24 September 2004 09:03

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