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Author Topic: Vibration - Yep. It was the TC  (Read 1225 times)

Stan Paralikis

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Vibration - Yep. It was the TC
« on: December 07, 2008, 12:44:43 PM »

I'm getting a first order vibration I do not like. That means a vibration that increases in direct proportion with an increase in RPM.  From idle on up. In neutral or in gear. Moving or at standstill.
Thinking of focussing in on the torque converter.
Should it matter how if was bolted to the flex plate?
That is...If I unbolt the TC from the flexplate and rotate it 90 degrees, should it make a difference?  I wouldn't think so, but, I'm listening...
 
Commando12009-01-06 12:12:03

Steve

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Vibration - Yep. It was the TC
« Reply #1 on: December 07, 2008, 03:29:33 PM »

No Stan
It will only bolt on one way.

You took the weights off that right?
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Stan Paralikis

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Vibration - Yep. It was the TC
« Reply #2 on: December 07, 2008, 07:32:56 PM »

Yep.  Took the weights off.
 
"It will only bolt on one way. "
What are you talking about? The four holes where the flex plate bolt to the TQ are evenly spaced. If I unbolt the two and spin the TQ 90 or 180 degrees and rebolt it to the flexplate might do it.  Just like sometimes spinning the driveshaft 180 (which I already tried) will get rid of a vibration.
 
 
 
Commando12008-12-08 01:00:26

Steve

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Vibration - Yep. It was the TC
« Reply #3 on: December 08, 2008, 03:50:10 AM »

every other flex plate I have ever seen are slightly off
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Stan Paralikis

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Vibration - Yep. It was the TC
« Reply #4 on: December 08, 2008, 05:08:44 AM »

Hmmmmmmmmm............    Commando12008-12-08 10:16:33

Stan Paralikis

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Vibration - Yep. It was the TC
« Reply #5 on: December 08, 2008, 05:30:35 AM »

OK.  It's coming back to me.  I forgot that  The flex plate will only line up on convertor one way and it is not completely square.
Uncle Steevee to the rescue.  Again.

Butch Houghton

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Vibration - Yep. It was the TC
« Reply #6 on: December 08, 2008, 05:41:16 AM »

Yep,  all Flexplates  have 1 hole off by about half a hole width so they can only  go  on 1 way.

What do I see on both sides of the drain plug on the converter?    I know you took the weights off but  there still looks like some residual metal there,   maybe enough to still throw the balance? 

Other stupid things that'll  cause vibrations......Bell housing bolts loose ( BTDT)   Loose mounts Etc.    Maybe just something off in the Tune ,   bad sparkplug wire or plug ,  Initial timing too high ......you did use the port on the pass-side of the metering block for the vacuum advance, right?   not one in the baseplate?    Metering block is the ported source on a Holley.

Go thru all the usual checks & see if anything shows,  might not be a "balalnce" issue after all.

Butch


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Stan Paralikis

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Vibration - Yep. It was the TC
« Reply #7 on: December 08, 2008, 07:26:25 AM »

Quote from: HemiFury
Yep,  all Flexplates  have 1 hole off by about half a hole width so they can only  go  on 1 way.
What do I see on both sides of the drain plug on the converter?    I know you took the weights off but  there still looks like some residual metal there,   maybe enough to still throw the balance?
Other stupid things that'll  cause vibrations......Bell housing bolts loose ( BTDT)
Check
 
Loose mounts Etc.
Check. Check.
 
 Maybe just something off in the Tune ,   bad sparkplug wire or plug,
Check. Check.
 
Initial timing too high
Check
 
......you did use the port on the pass-side of the metering block for the vacuum advance, right?   not one in the baseplate?    Metering block is the ported source on a Holley.
Go thru all the usual checks & see if anything shows, 
Check. Check.  And, check.
 
might not be a "balalnce" issue after all.
Only after going through every tuning issue, did I start thinking about balance issues.
Commando12008-12-08 12:33:47

Butch Houghton

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Vibration - Yep. It was the TC
« Reply #8 on: December 08, 2008, 08:29:22 AM »

Okay then,  Good!  Ya got all the usual stuff checked.    Not converter most likely.

Can you actually see it vibrate at Idle or do you just feel it?

Butch


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Steve

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Vibration - Yep. It was the TC
« Reply #9 on: December 08, 2008, 11:35:42 AM »

Quote from: Commando1
OK.  It's coming back to me.  I forgot that  The flex plate will only line up on convertor one way and it is not completely square.
Uncle Steevee to the rescue.  Again.
 
This isn't going to be another one of those engine locked routines is it?
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Stan Paralikis

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Vibration - Yep. It was the TC
« Reply #10 on: December 08, 2008, 11:38:10 AM »

Oh you can see it all right....

Steve

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Vibration - Yep. It was the TC
« Reply #11 on: December 08, 2008, 02:07:12 PM »

There is another possibility

I sure hope not


You have a component like a piston or a rod way out of whack.  Did you by chance hae it balanced?

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Stan Paralikis

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Vibration - Yep. It was the TC
« Reply #12 on: December 08, 2008, 03:19:40 PM »

Nope.  But.....
The original rod & piston pairs were reused in the same cylinders.
 
 

 

glen cyr

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Vibration - Yep. It was the TC
« Reply #13 on: December 13, 2008, 04:35:12 PM »

Is it possible to put about a 2 ounce strong magnet on different positions on the front of the torque converter to offset the balance?. I've never tried it,but,...ya' never know. I'm not sure if they will fly off or not,but you could try one on the damper also! Dampers do slip as the rubber breaks down after many cycles!
 
Glen
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Stan Paralikis

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Vibration - Yep. It was the TC
« Reply #14 on: December 13, 2008, 04:43:44 PM »

I've been doing some research on daper theory.   What I have learned is that dampers don't smooth out vibrations from inbalance.  They are there for the torsional vibrations produced by the crank. In other words, with the type of vibration I'm etting, a damper is not the solution. 
 
I think.
 
I need to think about this some more. 
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