| Re: [GMCnet] Fan Shroud questions [message #163160] |
Fri, 16 March 2012 12:27  |
enate98690
Messages: 23
Registered: January 2012
Karma:
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Junior Member |
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Steve,
I don't know the "official" reason for the tight, metal venturi ring on the GMC's. I always assumed it was due to potential fan disintegration. Having the fan blades fly off of a Corvette where the engine is well forward of the driver is one thing.
Having the fan blades fly off of a GMC where the driver is almost literally right above the fan is quite another. And, let's face it, fans are most likely to go through disintegration in high RPM situations where the centrifugal force would be immense.
Just my thoughts; the "official" reason might be something completely different.
Thanks,
Keith Lee
-----Original Message-----
>From: Steve Southworth <midlf@centurytel.net>
>Sent: Mar 15, 2012 6:20 PM
>To: gmclist@temp.gmcnet.org
>Subject: [GMCnet] Fan Shroud questions
>
>
>
>I'm pulling the radiator and fan shroud off my front clip and am somewhat intrigued by the way GMC did this. On my 75 Vette the fiberglass fan shroud extends back over the fan, with some clearance between the fan blade tips and the shroud, enough to get a fan belt past. On the GMC, as most of you are aware, the fan "venturi ring", is mounted to the engine with a very tight clearance to the fan blades. This is an expensive method, parts and assembly time, compared to some of the alternatives used by GM.
>
>My question(s):
>
>Why did the GMC MH use this method?
>
>Was it the method used on the Toro?
>
>What is the purpose of the tight tolerance between the fan and the venturi ring? Noise reduction? Fan efficiency?
>
>Just curious.
>--
>Steve Southworth
>1974 Glacier TZE064V100150 (for workin on)
>1975 Transmode TZE365V100394 (parts & spares)
>Palmyra WI
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