strange canisters

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Zorm
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strange canisters

Post by Zorm »

ok, was playing with the corvair today, 65 Corsa Convertible. Replaced the belt, checked the spark plugs, ran some SeaFoam through it. Noticed I have a vac leaks under both primary carbs. I have a bad oil leak someplace, I'm thinking lifter tube "O" rings, when I step on the gas in park, smoke shoots straight out the back of the car, the exhaust dumps out the sides.

While up front in the trunk just looking around, I saw what looks like a cylinder or canister between the head light bucket and the inner fender. I did not see any hoses or plumbing going to them, there is one on each side. There might be was felt like a bolt on top. Anyone have any ideas?

thanks

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terribleted
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Re: strange canisters

Post by terribleted »

Those are oil filled vibration dampers. They help eliminate cowl shake in the convertibles. There are supposed to be four or them. one in each corner of the car.
Corvair guy since 1982. I have personally restored at least 20 Vairs, many of them restored ground up.
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flat6_musik
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Re: strange canisters

Post by flat6_musik »

"Cocktail shakers" is their nickname.

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bbodie52
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Re: strange canisters

Post by bbodie52 »

They are the body dampeners — Found in Late Model convertibles — One in each corner.
bbodie52 wrote:From
Corvair Center Title Bar.jpg
:link: http://corvaircenter.com/phorum/read.ph ... 366,384498
Here is some interesting Q and A from a Camaro topic.
Seems they even had different part numbers between Camaro and firebird, and different numbers year to year!
And I still say, None of the Camaro/Firebird shakers are the same as Corvair.

Q. What are the canisters or dampeners in my convertible? Can I take these out and install something else? Also ... My convertible has a bad vibration while going down the road what could it be?

A. On the corners of convertibles there are what's called "cocktail shakers" or vibration dampeners which were originally installed on every first gen convertible Camaro to help prevent vibrations. They were installed due to a very flexible body in the convertible models because of the lack of the roof structure. Some reinforcement was added to the convertible rockers and floors but it wasn't enough to prevent all vibration problems. The cocktail shakers are large cans with a suspended mass on a spring in a viscous fluid that are mounted on the corners - 4 in all. They were tuned to a resonant frequency of the convertible that caused the vibration problems. When the body was subjected to loading that would otherwise tend to make it oscillate, much of the energy was instead absorbed by the motion of the masses in the cocktail shakers - which reduced the vibration in the convertible body. The cocktail shakers weight about 25 pounds each.

It certainly would be possible to add a large amount of structural stiffness (subframe connectors won't be anywhere near enough) to the mid-section of the body to reduce or eliminate the vibration to the point of being able to remove the cocktail shakers. However that possibility would be very remote without a complete understanding of the Camaros stress and flex points. Another option would be to design and build your own vibration dampener. That, however, would require knowledge of the structural frequencies of the Camaro convertible body not to mention knowledge of how to tune the damper you are creating. The cocktail shakers are filled with automatic transmission fluid or ATF. The fluid is not subjected to friction, high heat or contamination as is the case with other fluid applications in the vehicle so it should not "wear out". The springs would be the only thing that could change or break, that would keep them from working properly. We have never found a "bad" one, if it still has fluid in it, only cars missing them which have the common 'cowl shake' much worse than normal. If your convertible Camaro has all four cocktail shakers and you still have bad vibration problems be sure to check that your tires are balanced properly and also new OEM body bushings can help reduce some of the vibration transfer. Be sure to check your springs and shocks as well. You should also try adding subframe connectors to help with flex and vibrations
I think I could live happily in that trunk...
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:chevy:
Brad Bodie
Lake Chatuge, North Carolina
Image 1966 Corvair Corsa Convertible

66vairguy
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Re: strange canisters

Post by 66vairguy »

The convertible dampers do seem to make a difference as claimed by folks that have driven their cars with and without them.

The rear units are sometimes missing in convertibles. Some speculate it was to reduce rear weight, but the rear units must be removed to do any kind of body work. On the cars I've seen with them missing they all had "body work" done on the rear panel. I suspect the body shops forgot to put them back in, or didn't want too spend the time to do it.

BTW - The late 60's Camaro convertible had them in the rear unibody area.

Wagon Master
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Re: strange canisters

Post by Wagon Master »

If you need/want any rear units, let me know.

Zorm
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Re: strange canisters

Post by Zorm »

I'll double check Wagon Master, I may need the two rear, didn't remember seeing them, well, didn't really look either.

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azdave
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Re: strange canisters

Post by azdave »

Pics of DS rear dampener in a 66 Monza.
Attachments
P7160071.JPG
P7160076.JPG
P7160078.JPG
Dave W. from Gilbert, AZ
65 Corsa 140/4
66 Corsa 140/4
66 Corsa 140/4 w/factory A/C
66 Corsa 455 Toro V8
65 Monza Convertible 110/4
66 Monza Convertible 140/4
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5

Zorm
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Re: strange canisters

Post by Zorm »

OK, I need the rear ones, they are missing

Wagon Master
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Re: strange canisters

Post by Wagon Master »

Zoom, check your private messages.

Wagon Master
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Re: strange canisters

Post by Wagon Master »

Bump

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