Engine Vibration - 3K RPM - Team Camaro Tech
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post #1 of 7 (permalink) Old Apr 11th, 08, 07:17 PM Thread Starter
VB
 
Join Date: Sep 2003
Posts: 5
Engine Vibration - 3K RPM

I'm having a engine vibration at 3000 RPM and haven't been able to diagnose the problem. After about 300 miles of use, the vibration started and seems to be engine related.

Drivetrain Details:
- ZZ502, Fluidamper, Holley 850, MSD Digital6, March serpentine with AC
- T-56, Centerforce DF, Scattershield (indexed)
- Hydroboost brakes

Items looked at so far:
- Vibration occurs when:
- Moving and sitting still
- Clutch engaged or disengaged
- Trans in gear and out of gear

- Plugs and wires checked - plugs clean, gap correct
- Replaced waterpump

Any ideas on what to look at next?

Thanks,
Steve

'68 Camaro RS - 502ci, Viper T56, Ford 9", Z06 brakes<br />'67 Camaro - 327ci, TH350, Ford 9", Baer<br />'97 Viper GTS - 488ci, Borla, K&N, shifter, Hoosier slicks
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post #2 of 7 (permalink) Old Apr 11th, 08, 08:37 PM
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Don
 
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Re: Engine Vibration - 3K RPM

This is an external balanced motor, did it orginally come with the factory balancer? if so , can you install it and see what happens? How about flywheel?

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #3 of 7 (permalink) Old Apr 11th, 08, 11:49 PM
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Ron
 
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Re: Engine Vibration - 3K RPM

I personally do not like Fluid Dampers - seems to me I'm always replacing them with good old Chevy ones on my friends cars. Could be related to clutch pressure plate balancing.

Z15CAM - There was a Viper in my Rear View
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post #4 of 7 (permalink) Old Apr 12th, 08, 05:53 AM
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Harry
 
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Re: Engine Vibration - 3K RPM

Ok I just remedied my motor vibration problem on my 406
its the balancer!
reinstall the OEM balancer before something breaks.


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post #5 of 7 (permalink) Old Apr 12th, 08, 06:15 AM
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Dave
 
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Re: Engine Vibration - 3K RPM

Quote:
Originally Posted by dawg View Post
Ok I just remedied my motor vibration problem on my 406
its the balancer!
reinstall the OEM balancer before something breaks.

Dawg, you're saying the "Fluidamper" is the likely cause of the vibration? I thought those were pretty good pieces. I have one on my engine. The damper is easy enough to swap out though, so this could be a fairly easy test.

----------------------

VB, on the Centerforce DF clutch, I seemed to run smoother after I removed the weights. So that's something else you might try.

----------------------

Cylinder misfire is another distinct possibility. Compression check might be in order. An easy test is - engine at fast idle, disconnect one plug wire at a time. You should notice audible rpm drop (use a tach if it helps). If you remove a wire and no change, well............... Of course, use an insulated wire removal tool to avoid a mini-Tase incident, lol. Don't Tase me bro!

Good luck, I've had plenty of vibration issues and they can drive you crazy.

-

Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #6 of 7 (permalink) Old Apr 12th, 08, 05:02 PM
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Bill
 
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Re: Engine Vibration - 3K RPM

Quote:
Originally Posted by VB View Post
After about 300 miles of use, the vibration started
Steve,
If the vibration was not there initially, then I seriously doubt that it is the damper or anything internal to the engine. If those parts are going to cause a vibration, they will do it from the start.

Are you sure it is a "vibration" and not a missfire or other rough running situation ? Does the vibration go away above 3000 rpm ? A mechanical out of balance condition usually gets worse as the rpms are increased.

Try taking the serpentine belt off and see what happens. It wont hurt the engine to run it for a couple of minutes without it. That might help isolate it some.

Bill Koustenis
Owner
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Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


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post #7 of 7 (permalink) Old Apr 12th, 08, 08:42 PM Thread Starter
VB
 
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Re: Engine Vibration - 3K RPM

Thanks all for the quick replies.

Bill, the vibration wasn't there from the beginning and just started recently. The problem goes away at higher RPM and is only present from about 2800-3200 RPM. Your suggestion about taking off the belts is a good one to try.

Has anyone had a vibration problem with their PS pump or alternator? I'm wondering if the PS pump might be fried due to the extra heat and load put on it from the Hyrdaboost.

'68 Camaro RS - 502ci, Viper T56, Ford 9", Z06 brakes<br />'67 Camaro - 327ci, TH350, Ford 9", Baer<br />'97 Viper GTS - 488ci, Borla, K&N, shifter, Hoosier slicks
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