New Sanden squalling above 3000 rpm

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dogbone
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Joined: Wed Aug 09, 2017 7:06 am

New Sanden squalling above 3000 rpm

Postby dogbone » Wed Aug 09, 2017 7:29 am

Here's the story, I need some suggestions. I've just revived the A/C on my 1964 Ramber Classic stationwagon. It's pretty much a clean install with new condenser, dryer, expansion valve and new Sanden 508 compressor. I used the original evaporator but flushed it well to remove any old oil and trash. I pulled vacuum for about 6 hours then charged the system with three cans of R134a. It's cooling great. Outside temp is 90 degrees and I'm getting 45 out of the center vent, sometimes going down to 39. Low side pressure is running 15-20, high side 250 at 1500 or so rpm. I can drive it around and it works fine, but I've noticed when going over 3000 rpm the compressor really squalls. Sounds like a dry bearing vibrating in something. I've checked to make sure it's not the belt slipping or the clutch. The sound is definitely coming from the compressor. I can feel the vibration on the suction hose.

The compressor itself was full of oil from the factory. I have added about 3 oz of oil to the system. The compressor has a little smaller pulley than the engine pulley so I'm sure it's being overdriven slightly. It's rated to 6000 rpm and I'm sure It's no where close to that.

Is it possible I just need to add more oil? I know putting too much oil is a problem. Any suggestions would be appreciated. Thanks
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Tim
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Re: New Sanden squalling above 3000 rpm

Postby Tim » Wed Aug 09, 2017 10:24 am

Belt issue

Bad compressor

What are the pressure readings?
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dogbone
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Re: New Sanden squalling above 3000 rpm

Postby dogbone » Wed Aug 09, 2017 1:43 pm

Low side pressure is running 15-20, high side 250 at 1500 or so rpm.
ice-n-tropics
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Re: New Sanden squalling above 3000 rpm

Postby ice-n-tropics » Wed Aug 09, 2017 4:28 pm

All/100% of SD508s are noisy at 2800 compressor rpm. Comp itself is ok.
The addition of a aftermarket suction muffler reduces noise 20% and a discharge muffler reduces NVH another 15%.
Oil quantity is ZERO influence.
Get use to it or swap for a SD7H15 or a swashplate drop in or a SD708 (bracket mods req'd)
hotrodac
"How to Air Condition Your Hot Rod"
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Tim
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Re: New Sanden squalling above 3000 rpm

Postby Tim » Wed Aug 09, 2017 8:51 pm

ice-n-tropics wrote:All/100% of SD508s are noisy at 2800 compressor rpm. Comp itself is ok.
The addition of a aftermarket suction muffler reduces noise 20% and a discharge muffler reduces NVH another 15%.
Oil quantity is ZERO influence.
Get use to it or swap for a SD7H15 or a swashplate drop in or a SD708 (bracket mods req'd)
hotrodac
"How to Air Condition Your Hot Rod"


Been so long, I forgot about the Sanden rumble.
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dogbone
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Re: New Sanden squalling above 3000 rpm

Postby dogbone » Thu Aug 10, 2017 6:30 am

ice-n-tropics wrote:All/100% of SD508s are noisy at 2800 compressor rpm. Comp itself is ok.
The addition of a aftermarket suction muffler reduces noise 20% and a discharge muffler reduces NVH another 15%.
Oil quantity is ZERO influence.
Get use to it or swap for a SD7H15 or a swashplate drop in or a SD708 (bracket mods req'd)
hotrodac
"How to Air Condition Your Hot Rod"


Well, that sucks. I ran it a little yesterday just to make sure I had my facts straight. I can feel the "sound" in both hoses at lower rpms, but when it gets up to around 3000, a little before, it's like someone has flipped a switch and it's screaming. Sounds like it should start smoking at any second! This old car seldom hits higher rpms other than just before a shift. Although I had considered swapping out the rear end which would make it more likely. Wish I had known about this prior I would have used the SD7H15.
ice-n-tropics
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Joined: Sat Apr 23, 2016 3:40 pm

Re: New Sanden squalling above 3000 rpm

Postby ice-n-tropics » Thu Aug 10, 2017 6:51 am

Smitties and underhood/firewall insulation might keep the rumble masked
hotrodac
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Tim
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Re: New Sanden squalling above 3000 rpm

Postby Tim » Thu Aug 10, 2017 10:03 am

Should not be screaming. Sanden's do have a rumble as mentioned. But again it's not a screaming sound by any means.
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ice-n-tropics
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Re: New Sanden squalling above 3000 rpm

Postby ice-n-tropics » Tue Aug 15, 2017 11:58 am

Hi Mr. dogbone,
Since the A/C is unacceptable, I'll take it off your hands.
Mother Hubbard's hotrodac

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