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-   -   Nasty Vibration (https://classracer.com/classforum/showthread.php?t=26562)

Mike Voth 06-22-2010 09:19 AM
Re: Nasty Vibration
 
Quote:
Originally Posted by RPinoski1 (Post 193612)
Might have lost a wheel weight or two???????
New tires last weekend at Denver. Balanced with no change. Thanks

Mike Voth 06-22-2010 09:22 AM
Re: Nasty Vibration
 
Quote:
Originally Posted by Adger Smith (Post 193661)
Rear bushing in tranny or main shaft bearing.
That's where we're going tonight, along with 3rd member. Thanks, Adger.

Mike Voth 06-22-2010 09:25 AM
Re: Nasty Vibration
 
Quote:
Originally Posted by Darrin Christen (Post 193663)
Had a similar problem years ago. I had the drive shaft rebalanced, changed the bushing in the trans tail shaft housing, and also had the front and rear wheels rebalanced. Problem was still there, bad vibration about the last 300' of the track. Ended up breaking the trans case across the bell housing. I put a new Dedenbear trans case in the car and the problems was still there. By this time the rear tires needed replacing and bingo the problem went away. Smooth as glass with the new tires. Before this problem started the car had sat in the garage for two months while freshing the engine. I had neglected to put the car up on jack stands and I guess the rear tires got flat spots. Won't make that mistake again.
Yeah, that's the reason the tires where changed before we made any runs at Denver. Thanks, Darrin.

Mike Voth 06-22-2010 09:27 AM
Re: Nasty Vibration
 
Quote:
Originally Posted by Stephen & Horace Johnson (Post 193686)
I had the same issue on my 5speed mustang, it would vibrate so bad that it would jump out of gear as soon as i pulled into gear. It was my mainshaft that was bent. I took it to work and put it on jig and realize it was bent!!! I junked it and put a new one in, and never had the problem again.
Got the tranny out last night. After it's apart tonight, we'll set the main shaft up on "V" blocks just to see if there is an obvious bend. If not, it's going in to get checked tomorrow. Thanks, Adger.

Mike Voth 06-22-2010 10:06 AM
Re: Nasty Vibration
 
Quote:
Originally Posted by deuces wild (Post 193687)
Mike I had the same thing last year. I could not hold the shifter in high gear. Pilot bearing came out in pieces when we dropped the can. Ed
Another good suggestion. We'll find out tonight. Thanks, Ed. Coming up to Tulsa this weekend?

chris tinberg 06-22-2010 08:58 PM
Re: Nasty Vibration
 
Hey mike when we first got the cavalier done we had a terrible vibration in the steering from the 1000 ft on ,we checked everything, to make a long story short we had a bad set of front tires how we found this out jason took them to a tire shop in north kcmo that balances big tires like for FWD trucks it is different than conventional spin balancers it has wheel of some sort that spins on the outside of the tire and thats how we found out the tire wasn't round from now on we always take them there to get mounted and balanced . this might not be your problem but keep that in mind for the future ,don't trust the track balancers were you buy your tires we had both front and rears checked and they told us they were ok ! good luck chris

Mike Voth 06-23-2010 08:34 AM
Re: Nasty Vibration
 
Quote:
Originally Posted by chris tinberg (Post 193903)
Hey mike when we first got the cavalier done we had a terrible vibration in the steering from the 1000 ft on ,we checked everything, to make a long story short we had a bad set of front tires how we found this out jason took them to a tire shop in north kcmo that balances big tires like for FWD trucks it is different than conventional spin balancers it has wheel of some sort that spins on the outside of the tire and thats how we found out the tire wasn't round from now on we always take them there to get mounted and balanced . this might not be your problem but keep that in mind for the future ,don't trust the track balancers were you buy your tires we had both front and rears checked and they told us they were ok ! good luck chris
Thanks, Chris. Even on stands, the vibration is horrible. On visual inspection, the rears don't seem to be out of balance, ie. not hopping or bouncing. I think it has to be in the driveline somewhere, but I also think we need to balance the tires once, as you mentioned. It definately wouldn't hurt and might make the ride more smooth.

Thanks again for the suggestion. Why weren't you guys at Denver?

Ed Carpenter 06-23-2010 05:23 PM
Re: Nasty Vibration
 
Mike find out anything yet? No im not coming to Tulsa. Considering going to the 3 races in 3 days S/SS combo at Belle Rose next month. Ed

Mike Voth 06-24-2010 08:17 AM
Re: Nasty Vibration
 
Got the clutch and pressure plate back yesterday. The pressure plate was out of balance by 38 grams!! We all know that these cintered iron setups warp from all the sliding, but does that usually make them out of balance?? Nothing was missing from the pressure plate, and the disc is still in one piece. Anyone ever have this issue?? The tranmission is still coming apart, hopefully tonight, but 38 grams is a TON spinning at 9000 RPM

Any other thoughts??

Adger Smith 06-24-2010 08:38 AM
Re: Nasty Vibration
 
Mike,
I'm sure thay told you 38 grams, but to really tell how much out it is the actual correction radius needs to be known... 38 G. 2 in from center is not nearly as much as 38 g. 8 in from center..... Still 38 G is a big number for any correction radius.
That could have knocked a little extra clearance in a few other vital parts. Rear bushing and Pilot bearing as well as all bearings in the tranny come to mind..
good luck


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