| Re: [GMCnet] [GMCNet] Electric fan [message #354215] |
Tue, 28 April 2020 09:06  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Until quite recently the fans on the DD Series 60 Prevost buses like ours used three crankshaft driven V belts running to a right angle fixture which turned a drum with a wide flat belt driving a viscous clutch which drove the fan. The fan clutch and fan are mechanically similar to our GMCs, only much larger. All these belts were pneumatically tensioned by the engine driven air compressor so if a belt broke the driver could change belts on the side of the road without tools and be back underway quickly. Since the engine is at the back of a 40 foot tube and has a gazillion pounds feet of torque you really never hear or feel the fan coming on but it sure does cool the water temp quickly. Fan clutch failure is very rare and the belts seldom ever break.
Prevost (now owned by the Volvo truck and bus company in Europe) now uses Volvo diesel engines and they do use electric fans in the more recent versions. Those electric fans are just part of a carefully engineered cooling system and not something that turns slapped on the face of an existing radiator. For our GMCs I would imagine that it will take a similar whole system approach to finding a new radiator and electric fans in an engineered package. It looks like that is what Jim Bounds at the Coop is trying now.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
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Message: 2
Date: Mon, 27 Apr 2020 16:45:38 -0600
From: John R. Lebetski
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Electric fan
Message-ID:
Content-Type: text/plain; charset="utf-8"
Most highway busses (Prevost) are 24 VDC or mixed 24/12V. Makes a big difference when powering HVAC fans and cooling fans.
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John Lebetski
Woodstock, IL
77 Eleganza II
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Jerry & Sharon Work
78 Royale
Kerby, OR
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