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| tjpreul | Engine-a/c vibration | ||
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Elite Guru
 
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Well I charged up the a/c with the new (used) compressor. There is still a vibration around 2100rpm (when driving). The old compressor did the same thing, so I replaced it. It isn't as bad with the new one though, but is still there. With no load on the engine when I rev it up there is a slight vibration between 1-1.5k. Any ideas?
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Posted on: 2010/4/30 2:43
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| Matatk | Re: engine-a/c vibration | ||
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Is everything aligned properly?
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Posted on: 2010/4/30 2:52
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| tjpreul | Re: engine-a/c vibration | ||
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Elite Guru
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As far as I can tell. Is there another way besides a straight edge across the belt/pulleys. It isn't there at 2000 or at 2300. If I shut off the air it is gone, but like I said the old one would pull down the motor quite a bit, but did the same thing.
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Posted on: 2010/4/30 3:11
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| Andrew | Re: engine-a/c vibration | ||
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2013 Memorial Day Car Show Winner!
 
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Hey Tyler, not sure I can help much, but my car does the same thing (my last LT4 did it as well). It starts about 1900 - 1950 rpm and vibrates to about 2200 rpm, then goes away. With the 6 speed, it's not a big deal, but with auto, I could see it being annoying.
I looked at my belt recently and noticed very slight rub marks on the rear of the belt. Almost like something isn't aligned properly. Soooo, long story short, I'm also curious!!???? |
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Posted on: 2010/4/30 21:11
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2003 Atomic Orange Z06 Sold - 1996 Competition Yellow LT4 - DRM 383, NX N2O, Line Lock, LT Headers, 3" stainless exhaust, Power Effects, and many more mods SOLD 1996 Competition Yellow LT4 SOLD 1979 4 Speed with 383 |
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| tjpreul | Re: Engine-a/c vibration | ||
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Elite Guru
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I've taken the belt off to double check, and I don't see anything wrong. I slowly revved the engine from the throttle body. At a certain point I could see (and feel the vibration) noticing the compressor body was shaking.
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Posted on: 2010/5/1 17:26
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| Danspeed1 | Re: Engine-a/c vibration | ||
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Elite Guru
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Yup, sounds like too much Compressor shaft play, probably both forward and aft as well as up and down. Might be a bad clutch bearing causing the issue; might just be a worn shaft. I believe there is someway to remove the clutch and measure the play but I can't remember how specifically. I did this about 5 years ago and haven't done it since; not exactly something you would do regularly.
Problem is with the compressor. When the a/c is on the clutch engages, and spins the compressor. Reason the vibration goes away is because when you shut the a/c of the clutch disengages the compressor. DG |
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Posted on: 2010/5/3 6:47
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1971 Chevelle SS (The Original) 1972 Chevelle SS 454 1995 Corvette Convertible 1996 Ford Explorer 2009 Cadillac CTS-v |
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| tjpreul | Re: Engine-a/c vibration | ||
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Elite Guru
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When I had the belt off, I tried to move the pulley in all directions and there was no play. My friend that charged it realized we might have too much 134 in it. He had said he noticed a different volume in the compressor when he put the last can in. The '92 calls for 36oz since it was R-12, and the '95 calls for 32oz. We are hoping this will make a difference.
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Posted on: 2010/5/4 2:00
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| Danspeed1 | Re: Engine-a/c vibration | ||
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Elite Guru
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Did you fix it. What type of refrigerant are your running, R-12 or R134A? That seems a little unusual to me to be honest. Plus if you had way overcharged the system, the high pressure switch should shut the compressor off so you shouldn't have a situation where overcharging effects operation. However, I have been wrong before. Please keep us updated, as I am interested in how this turns out.
P.S. if you are running R-134A in an R-12 system the amount you need to put in changes. I don't know if your retrofitted or not, just mentioning it. DG |
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Posted on: 2010/5/4 4:47
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1971 Chevelle SS (The Original) 1972 Chevelle SS 454 1995 Corvette Convertible 1996 Ford Explorer 2009 Cadillac CTS-v |
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| tjpreul | Re: Engine-a/c vibration | ||
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Elite Guru
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It had been converted to 134. The compressor is off of a '95 which that system is a 134 vs. the '92 with R12. When I looked up the charge rate from the '92. We are going to change this, and see if fixes it.
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Posted on: 2010/5/4 13:33
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| Danspeed1 | Re: Engine-a/c vibration | ||
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Elite Guru
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I still believe the compressor is the issue, however the amount of refrigerant the system takes changes when you move from R-12 to R-134A, (I believe you do need less, you may need more, can't remember) so you probably are "slightly" overcharged... again if you were massively overcharged your high pressure switch would shut the compressor down. I think your are supposed to put 75% of the R134A back in as opposed to a full R-12 charge. Meaning if the system took 4 ounces of R-12 you would put 3 of 134A. Again, not really sure this is going to make any difference.
Unless your original compressor suffered from black death or something, I see no reason why you can't just swap back to the old one and recharge with R-134A. All you really need to do is dump out the old ester oil, and add PAG. If your really anal you can change the shaft seal... I would recommend upgrading the o-rings (where the barrier hoses seal to the compressor) with new green 134A ones. I have never actually used a different compressor when retrofitting a car. I usually just upgrade all the o-rings to 134A o-rings, swap oil to PAG, Change the accumulator/receiver/dryer (last car I did, didn't even do that)... Vacuum out the system for like 3 hours, change the ports and refill with the correct amount of 134A. Well, put in less R134A and let me know how it works out, I am very interested in the resolution to this problem. I am always looking to learn something new. Good luck, DG |
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Posted on: 2010/5/5 1:07
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1971 Chevelle SS (The Original) 1972 Chevelle SS 454 1995 Corvette Convertible 1996 Ford Explorer 2009 Cadillac CTS-v |
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| tjpreul | Re: Engine-a/c vibration | ||
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Elite Guru
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My friend is leaving for Vegas, so it will be next week before we get back to it. My old compressor had the same issue. With it the car would start to vibrate @68mph and go to 75mph before it would become less noticable. With this one I almost have to be dead on 70mph. The car had been changed to 134 still using the original compressor. A problem was one of the lines was cross threaded and the oil had drained out, but the previous owner said he would add 134 when it stopped working. This is why I replaced the compressor, and this one is much better (quieter) with less vibration.
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Posted on: 2010/5/5 3:28
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| LD85 | Re: Engine-a/c vibration | ||
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Master Guru
 
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take the serpentine belt off and drive the car a short distance to see if that is really the deal,, pulley alignment is important because mine were mis aligned once and the belt flew off
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Posted on: 2010/5/8 0:52
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| Danspeed1 | Re: Engine-a/c vibration | ||
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Elite Guru
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Any updates on this,... I am very interested in the resolution
DG |
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Posted on: 2010/5/15 7:05
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1971 Chevelle SS (The Original) 1972 Chevelle SS 454 1995 Corvette Convertible 1996 Ford Explorer 2009 Cadillac CTS-v |
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| tjpreul | Re: Engine-a/c vibration | ||
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Elite Guru
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Well I finally got back to it, and found the problem. The mount bar from the manifold to the back of the bracket was missing its bolt. There is no way for this bolt to come out because it would hit the compressor before it would run out of threads.
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Posted on: 2010/7/24 17:12
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| BillH | Re: Engine-a/c vibration | ||
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The Stig Moderator
 
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Did that fix the problem? There sure is a chitload of supports on a 92 compressor. |
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Posted on: 2010/7/25 13:54
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Every man dies but not every man lives. |
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| tjpreul | Re: Engine-a/c vibration | ||
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Elite Guru
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Its fixed. It is kind of upsetting that this wasn't noticed earlier, but its hard to see a missing bolt when it is covered up. Plus when you try to move shake things by hand they are solid. |
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Posted on: 2010/7/25 14:30
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| BillH | Re: Engine-a/c vibration | ||
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The Stig Moderator
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Good it's fixed. That bolt's kinda hidden. Supprising that that was the problem. Was the other brace there? The one that's directly on the other side of the compressor from your missing bolt (the one that goes to the same bolt on the mainfold)? |
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Posted on: 2010/7/25 14:47
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Every man dies but not every man lives. |
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| Andrew | Re: Engine-a/c vibration | ||
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2013 Memorial Day Car Show Winner!
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Do you have any pictures of what you are describing? The accessories have been off my car so many times that this is probably the same issue you had.
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Posted on: 2010/7/26 1:03
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_________________
2003 Atomic Orange Z06 Sold - 1996 Competition Yellow LT4 - DRM 383, NX N2O, Line Lock, LT Headers, 3" stainless exhaust, Power Effects, and many more mods SOLD 1996 Competition Yellow LT4 SOLD 1979 4 Speed with 383 |
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| tjpreul | Re: Engine-a/c vibration | ||
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Elite Guru
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... Here are a few pictures. I have to go to work and will edit my post there.
Attach file:  DSC01836.JPG (329.38 KB) DSC01838.JPG (351.77 KB) |
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Posted on: 2010/7/26 12:54
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| BillH | Re: Engine-a/c vibration | ||
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The Stig Moderator
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Tyler, this is the other brace I mentioned. I could be wrong but, it looks like isn't one there in your second pic.
Both are on the same stud on the exh. manifold. Attach file: IMGP0932.JPG (0.00 KB) IMGP0933.JPG (0.00 KB) IMGP0934.JPG (0.00 KB) |
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Posted on: 2010/7/26 13:18
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Every man dies but not every man lives. |
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| Andrew | Re: Engine-a/c vibration | ||
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2013 Memorial Day Car Show Winner!
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Thanks for the pictures. Hmmm, I think this is my problem. I don't believe this was ever on my car, or at least since I purchased it.
Was this brace on the 96 C4's? If so, where can I get the brace and bolts? |
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Posted on: 2010/7/26 13:19
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2003 Atomic Orange Z06 Sold - 1996 Competition Yellow LT4 - DRM 383, NX N2O, Line Lock, LT Headers, 3" stainless exhaust, Power Effects, and many more mods SOLD 1996 Competition Yellow LT4 SOLD 1979 4 Speed with 383 |
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| BillH | Re: Engine-a/c vibration | ||
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The Stig Moderator
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Tyler's (and mine) are 92's, the brackets & braces may be different on a 96. If you want more pics, shout out. |
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Posted on: 2010/7/26 13:20
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Every man dies but not every man lives. |
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| tjpreul | Re: Engine-a/c vibration | ||
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Elite Guru
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The bolt that was missing was on the brace from the exhaust manifolt to the back of the compressor. You can see that it would hit the compressor before it would fall out.
Bill, I am missing that other brace. That would explain why one of the four bolts that hold the compressor on is longer than the others. |
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Posted on: 2010/7/26 13:23
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Vegas wasn't built on winners. '92 auto, MSD, Banski, Taylor wires, SS lines, C5 rims, 3.07 gears, white gauges, seats from a '96. Motor: Forged rotating assy, Probe pistons, CC valvetrain, AFR heads, Procharger P1SC |
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| BillH | Re: Engine-a/c vibration | ||
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The Stig Moderator
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Yea, that makes sense. With both braces missing or unbolted, no wonder you had a vibration. If you decide to add that and can't get one, let me know. I can pull it for the dimensions,it would be easy to fab. |
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Posted on: 2010/7/26 13:28
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Every man dies but not every man lives. |
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| BillH | Re: Engine-a/c vibration | ||
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The Stig Moderator
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No idea on your 96, maybe you should start another thread and ask for pics. You could possibily get them at a salvage yard,etc. Not all that hard to fab up if you have a torch. |
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Posted on: 2010/7/26 13:31
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Every man dies but not every man lives. |
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| tjpreul | Re: Engine-a/c vibration | ||
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Elite Guru
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Thanks, V2V has them. I'm glad I haven't taken the PO's advice on which shop to use. |
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Posted on: 2010/7/26 14:10
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| tjpreul | Re: Engine-a/c vibration | ||
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Elite Guru
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I asked V2V about this, and they said they are the same. However yours may be different with the headers and other mods, so I would check the bracket measurements before ordering. They said they have them in stock. |
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Posted on: 2010/7/26 20:02
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