| [GMCnet] air belt [message #90578] |
Wed, 30 June 2010 18:56  |
paul h cashman
Messages: 176
Registered: May 2005
Karma: 0
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Senior Member |
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Hi all
I have noticed, when the GMC Air is on there is a lot of vibration in the
belt especially at idle.Will this cause a problem?
Has anyone used an idler pulley to dampen the oscillations?
I have the smaller pulley on the compressor.
I thought with the smaller pulley there would be less occupations at idle...
Paul Cashma
Riverdale GA
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Paul H Cashman
Riverdale Ga
1978 Transmode
1975 Corvette
1978 Beetle Convertible
1989 Harley Davidson Sportster
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| Re: [GMCnet] air belt [message #90587 is a reply to message #90578] |
Wed, 30 June 2010 19:40  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Paul,
A smaller pulley on the compressor makes it spin faster, requiring more
horsepower to be transmitted through the belt. But you knew that. :-)
I'm not sure how a V-belt would react to a spring loaded idler like those
used for serpentine belts. Which belt I had to install today on the farm's
36,324 mile '93 F-150 before taking it on a 200 mile trip tomorrow.
Ken H.
On Wed, Jun 30, 2010 at 7:56 PM, Paul Cashman <paulcashman@bellsouth.net>wrote:
> Hi all
> I have noticed, when the GMC Air is on there is a lot of vibration in the
> belt especially at idle.Will this cause a problem?
> Has anyone used an idler pulley to dampen the oscillations?
> I have the smaller pulley on the compressor.
> I thought with the smaller pulley there would be less occupations at
> idle...
> Paul Cashma
> Riverdale GA
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] air belt [message #91384 is a reply to message #90587] |
Wed, 07 July 2010 09:45 |
paul h cashman
Messages: 176
Registered: May 2005
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Ken ,you are correct,
When I got the Compressor home to install ,I noticed the smaller Pulley and I thought it will give me more Cooling at low speeds,especially at idle and it seems to work that way.
A lot of the Vibration goes out as RPM increases.
....................................Later Paul
Paul H Cashman
Riverdale Ga
1978 Transmode
1975 Corvette
1978 Beetle Convertible
1989 Harley Davidson Sportster
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| Re: [GMCnet] air belt [message #91386 is a reply to message #91384] |
Wed, 07 July 2010 09:57 |
Surbo
Messages: 213
Registered: February 2004
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| paul h cashman wrote on Wed, 07 July 2010 09:45 |
Ken ,you are correct,
When I got the Compressor home to install ,I noticed the smaller Pulley and I thought it will give me more Cooling at low speeds,especially at idle and it seems to work that way.
A lot of the Vibration goes out as RPM increases.
....................................Later Paul
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Paul;
The belt vibration at slow rpm is caused by pulsations from the 'wobble box' compressor, and as you have found out, as rpm's increase, the pulsations even out and the belt runs smoother. The long length of the belt does not help the flopping either, at low rpm's.
B Drewes in SESD
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| Re: [GMCnet] air belt [message #91459 is a reply to message #90578] |
Wed, 07 July 2010 19:34 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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You might try slightly tighter tension or slightly faster idle speed to get out of the harmonic that has set up at that length, speed, and tension. (all you guitar players can relate I'm sure)
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] air belt [message #91497 is a reply to message #91459] |
Wed, 07 July 2010 23:39 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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I really wouldn't worry about it.It's very common not only on the GMC but thousands of vehicles with V belt drives. Just make sure it is good and tight on the "top" side".
Bob de Kruyff
78 Eleganza
Chandler, AZ
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