| [GMCnet] Fan clutch. [message #225148] |
Thu, 10 October 2013 21:26  |
Thomas Pryor
Messages: 143
Registered: January 2011
Karma:
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Senior Member |
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As I restore my 77 transmode into something that looks like a real coach I
keep waisting time investigating things I read on our Tribal Blog.
I Called Tech support at Hayden Auto parts and was informed that offer 3
levels of fans. The results of those discussions were as follows:
*Standard duty* - not recommended for our coaches.
*Heavy duty* - Recommended for our coaches in the form of part #2747.
*Severe Duty* -Are only recommended for applications with fans that have a
"pitch" of 2 1/2" or greater. (my Fan and others that I have measured have
a 2" pitch) What Performance issues are created when we use Hayden pt#
2797 (Severe duty)?
A GMC 2" pitch fan *cannot *"decouple" from a Severe duty Clutch.
A GMC 2" pitch fan will always be engaged and rob Horse Power / decrease
gas mileage when used with a severe duty fan Clutch
A GMC 2" pitch fan will create excessive noise, when used with a severe
duty fan clutch.
A GMC 2" pitch fan will probably NOT Lengthen the bearing life in the
Water pump when used with a Severe duty Fan clutch.
I Can't vouch for the Delco brand of fan clutches. Don't know if they have
the same performance criteria or curves of performance.
As a side Bar issue, I've also contacted a couple of aftermarket folks to
investigate Electric fan alternatives. I've also asked them to look at
lighter weight fans that "flatten out" at higher RPMs including "Tuned"
Viscous clutches for those fans.
I'll report out as information becomes available.
--
Regards,
Tom Pryor
4188 Limerick Dr
Lake Wales, Fl 33859
Cell 248 470 9186
Living on a waterfront is not a matter of life or death. Its more
important than that.
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