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Vibration in high gear
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DRR Sportsman
Picture of TomR
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-Pulled the trans last night, going thru it tonight. Flexplate looked good, no cracks anywhere, nothing missing off of it. Had a second pair of eyes look at it too.

-Having driveshaft balance checked again today. Installed a new yoke and u joint before last weekend so can't hurt to spin it and just double (triple) check it.

-Will check end play too while the trans is out (Thanks for the suggestion qtrrcr)

-Re-balancing tires tonight too. Going to compare static balance (my normal way of balancing them) vs 2-plane


72 Nova "Hooptie"
 
Posts: 744 | Location: Hanover, MD | Registered: June 20, 2016Reply With QuoteReport This Post
DRR Top Comp
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I was in Noble Oklahoma years ago in my old roadster. It started shaking to beat the band down in high gear. Took it to Sunset, tore it down, couldn’t find anything wrong. Ole Busby says, you don’t suppose this crankshaft is broken do you? Magged it and sure enough it was fixing to come unwound.


Clowns to the left of me, Jokers to the right. Here I am.......
 
Posts: 5318 | Location: stuck in the middle with you! | Registered: March 11, 2002Reply With QuoteReport This Post
DRR S/Pro
Picture of Lenny5160
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quote:
Originally posted by Cashflow:
I was in Noble Oklahoma years ago in my old roadster. It started shaking to beat the band down in high gear. Took it to Sunset, tore it down, couldn’t find anything wrong. Ole Busby says, you don’t suppose this crankshaft is broken do you? Magged it and sure enough it was fixing to come unwound.


I had something similar. Car felt a little shaky on this day. About 5th round that night, a good part of the crankshaft was hanging out of the timing cover.

After taking that apart, it looked like the keyway for the balancer was 'egged out' so the balancer had moved. Maybe throw a timing light on it just to verify the balancer hasn't moved?


Tony Leonard
 
Posts: 3168 | Location: Inver Grove Heights, MN | Registered: March 18, 2004Reply With QuoteReport This Post
DRR Sportsman
Picture of TomR
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quote:
Originally posted by Lenny5160:
quote:
Originally posted by Cashflow:
I was in Noble Oklahoma years ago in my old roadster. It started shaking to beat the band down in high gear. Took it to Sunset, tore it down, couldn’t find anything wrong. Ole Busby says, you don’t suppose this crankshaft is broken do you? Magged it and sure enough it was fixing to come unwound.


I had something similar. Car felt a little shaky on this day. About 5th round that night, a good part of the crankshaft was hanging out of the timing cover.

After taking that apart, it looked like the keyway for the balancer was 'egged out' so the balancer had moved. Maybe throw a timing light on it just to verify the balancer hasn't moved?


We checked it on Friday night at the track. It was at 38 just like we set it.

Dropped the driveshaft off. Going thru trans tonight. If both are ok, might have to look at the engine. I'll keep you all posted on what we find.


72 Nova "Hooptie"
 
Posts: 744 | Location: Hanover, MD | Registered: June 20, 2016Reply With QuoteReport This Post
DRR S/Pro
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Sounds like you twisted the splines on an axle.


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Posts: 1604 | Location: Suffern, NY | Registered: November 03, 2001Reply With QuoteReport This Post
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quote:
Originally posted by Strange Magic:
Sounds like you twisted the splines on an axle.



quote:
-checked wheels, tires and even pulled axles


.
Dave



F J B

 
Posts: 4476 | Location: Earth | Registered: February 08, 2006Reply With QuoteReport This Post
DRR Sportsman
Picture of TomR
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Driveshaft shop didn't get my stuff done last week so I could race over the weekend. Finally picked it up yesterday. I had them cut the front off and put a 1350 snout on it so I could get rid of the ******* 1350 to 1310 adapter u-joint. I asked them to spin it before they did anything to it. According to the shop, the balance "needed tweaking."

I also checked all 4 tires again. I first spun them in static mode and they all read 000. When I spun them in 2 plane, I had to add close to 3 ounces of weight on 2 tires (one front and one rear)

Hopefully this will fix my problem, once and for all. Tired of searching for it and complaining about it.

Car goes back together tonight.


72 Nova "Hooptie"
 
Posts: 744 | Location: Hanover, MD | Registered: June 20, 2016Reply With QuoteReport This Post



DRR Top Comp
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I feel your pain. We've all been there.

I fought a timing problem for awhile on my old car. Drove me nuts. It would run fine and then miss like crazy. You could check the timing and it would be okay. Then it would not. Reset it and it would be fine.

Finally found that the weld around the top of the distributor shaft was cracked and it would slip. Sometimes it would run okay for a few runs and then it would move. Sometimes it would move itself back into position.

Rewelded it and it was fine after that.


Clowns to the left of me, Jokers to the right. Here I am.......
 
Posts: 5318 | Location: stuck in the middle with you! | Registered: March 11, 2002Reply With QuoteReport This Post
DRR Sportsman
Picture of TomR
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Took the car out on Sunday and was hoping it was finally gone but no, it'still there about 60 feet before the finish line.

Everything since the previous race on June 16:

-Replaced the rear tires
-Re-balanced the front tires
-Had the driveshaft re-balanced again (they said it needed tweaking, was hoping this would fix it)
-Went thru and inspected everything in the trans (3 sets of eyes on it to be sure we didn't miss anything)
-Inspected the flew plate for cracks or any missing pieces (2 sets of eyes to make sure)
-Went thru valve train
-Checked filter for metal

Even had the intake off (sucked gasket) so I got to check lifters and such. Threw new gaskets on the carb and replace all the gaskets under the carb while I was at it.

Car shifts at 7100-7200 and goes thru at 6650-6700.

I'm at a loss, can't find it so I'm gonna stop looking for it and just power thru it.


72 Nova "Hooptie"
 
Posts: 744 | Location: Hanover, MD | Registered: June 20, 2016Reply With QuoteReport This Post
DRR Pro
Picture of CURTIS REED
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Took me a second to figure out what the flew plate is. LOL Has anyone mentioned the possibility of balance weight on converter missing if it had one?

Curtis



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Posts: 2965 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
DRR Pro
Picture of rusty
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thats where i was headed curtis


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

 
Posts: 1417 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
DRR Pro
Picture of CURTIS REED
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quote:
Originally posted by rusty:
thats where i was headed curtis


Great minds LOL



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Posts: 2965 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
DRR Sportsman
Picture of TomR
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I have a spare converter coming from FTI tomorrow and going in tomorrow night. We shall see I guess.


72 Nova "Hooptie"
 
Posts: 744 | Location: Hanover, MD | Registered: June 20, 2016Reply With QuoteReport This Post
DRR Trophy
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Tom, I just read through the posts quickly so I may have missed it but have you thought about the damper. Several years ago I developed a severe vibration and went through everything including looking at the rods and mains. The only thing I did besides inspection was to have ATI rebuild the balancer and vibration was gone the next time out.
 
Posts: 21 | Location: york haven,pa | Registered: December 24, 2008Reply With QuoteReport This Post



DRR Pro
Picture of rusty
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i could have missed it but are both ujoints new


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

 
Posts: 1417 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
DRR Sportsman
Picture of TomR
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quote:
Originally posted by rick 1147:
Tom, I just read through the posts quickly so I may have missed it but have you thought about the damper. Several years ago I developed a severe vibration and went through everything including looking at the rods and mains. The only thing I did besides inspection was to have ATI rebuild the balancer and vibration was gone the next time out.


Older fluidamper, it was checked when rotating assembly was balanced. 2 years ago


72 Nova "Hooptie"
 
Posts: 744 | Location: Hanover, MD | Registered: June 20, 2016Reply With QuoteReport This Post
DRR Sportsman
Picture of TomR
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quote:
Originally posted by rusty:
i could have missed it but are both ujoints new


New u-joints, new Strange yoke, new roller bearing in the tailshaft too.


72 Nova "Hooptie"
 
Posts: 744 | Location: Hanover, MD | Registered: June 20, 2016Reply With QuoteReport This Post
DRR S/Pro
Picture of David Covey
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quote:
Originally posted by Tom Reyer:
Update:

New bearing and seal were installed in the tailshaft last week. I also installed the new hardened Strange yoke and front u joint.

The vibration hasn't gone away and just keeps getting worse and worse the more I run it.

-Buying new front and rear tires

-Pulling the trans to go thru it and send the converter out to be checked.

-Pulling axles and R&P to check all the bearings in the rear.

If that doesn't fix it, I don't know what else to look for.


Years ago, I had a vibration problem like yours. Vibration started in high gear (4 speed)
It ended up being the pinion bearings the race looked like a wash board (if you know what that is...)
9 inch diff..Although that doesn't matter.

Dave


"It is usually futile to try to talk facts and analysis to people who are enjoying a sense of moral superiority in their ignorance." -Thomas Sowell
 
Posts: 3310 | Location: American By Birth Texan By The Grace Of God  | Registered: April 29, 2004Reply With QuoteReport This Post
DRR S/Pro
Picture of David Covey
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If the vibration doesn't come and go when the engine hits a certain rpm and then drops back I would doubt balancer, converter issue.

My old car F/G did exactly what you described, I launched at 8000, shifted at 9000, trapped at 8500 or there about. Vibration started about halfway through 4th gear.
The harmonics caused the drive shaft to twist in two in the middle. Done it twice before I stopped racing the car. I thought the chassis was flexing. Found the pinion bearings bad when I was putting the center section in a different housing.

I should have noticed how rough it felt when I was working on it but didn't until I pulled it out and was changing gears.

Dave


"It is usually futile to try to talk facts and analysis to people who are enjoying a sense of moral superiority in their ignorance." -Thomas Sowell
 
Posts: 3310 | Location: American By Birth Texan By The Grace Of God  | Registered: April 29, 2004Reply With QuoteReport This Post
DRR Sportsman
Picture of TomR
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New FTI converter went in Friday night. Can't believe they gave me a 1 day turn around on converting my old ATI converter, with a holiday thrown in there last week to boot. Customer service is TOP NOTCH with FTI. There is none better out there.

Pulled the axles again and cover to check bearings and R&P. Everything looked good and all bearings felt good, no tight spots, no chipped or cracked teeth. Splines were straight and axle bearing felt fine.

Happy to report it is not the engine. (woohoo)

We race 1/8 mile on a 1/4 mile track. I ran it out to the 1000ft yesterday and clicked in in neutral, it vibrated until it got under maybe 50-60 mph.

We tightened the rear shocks and it got much, much better. I had loosened them up last week for the hot weather we were having and it made the vibration worse.

Trying a friends rear wheels this weekend.

We are getting closer to figuring it out.


72 Nova "Hooptie"
 
Posts: 744 | Location: Hanover, MD | Registered: June 20, 2016Reply With QuoteReport This Post
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