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Ohio Tom (DdK)
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« on: March 28, 2011, 02:46:07 pm » |
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hey all. I was at the Lansing Mi, buggy builders show Sunday.
I can't seem to find any info on them.
Are they any good?
What is it worth (good used)?
Should I keep/run it?
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Ohio Tom Simpson. Home of the Killa' Bee.
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dangerous
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« Reply #1 on: March 28, 2011, 06:04:48 pm » |
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I think you will find that they are rebuildable, and are in demand by a few racers.
If I was going to fit something heavy on the snout of my crank,
that would be the only one I would use.
Anything else will destroy the crank snout and key way if you have a "harmonic" that needs dampening.
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N/A 10.93@122.31@1785lbs
Blower Mtr 147mph@1870lb
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Sleeper 64
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« Reply #2 on: March 28, 2011, 09:49:00 pm » |
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I have one on my street car. had the engine balanced and the machine shop said once the dampner was on the roating mass they had to do little to get the assembly balanced out.
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It might not be fast but it is paid for.
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cadprovw
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« Reply #3 on: March 28, 2011, 11:34:05 pm » |
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If you are interested in selling it, let me know...
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Chad Dailey
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Sleeper 64
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« Reply #4 on: March 29, 2011, 01:56:11 pm » |
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Not for sale. I waited 6 months to get it.
Aircooled.net used to sell them.
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It might not be fast but it is paid for.
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John P
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« Reply #5 on: March 29, 2011, 04:58:38 pm » |
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I've often wondered how they are, practically speaking, better at dampening the harmonics than a solid aluminum, Berg-type pulley, which is not a true harmonic dampener. Is it simply a factor of the different densities (fluid vs. aluminum)?
I get it (in part) in theory; I'm just interested in the actual before-and-after differences between the two types. Hype vs. practice type-of-thing.
J
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'67 Cal-Look Bug
Cornpanzer's
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dangerous
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« Reply #6 on: March 29, 2011, 08:16:04 pm » |
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Anything that does not have a dampening medium
will reflect the torsional vibration.
Often times it (the wave) will cancel itself with one that moves the opposite direction that is reflected from the flywheel.
At this point there is no flex, and cranks can begin to crack at that point.
If the masses and diameters change, so does the point at which the waves cancel. hence why some cranks break at the FW end and some at the Centre.
That is probably over simplified...
but the point is,
most different combinations will require a different damper.
Take a look at how many different ones are available for the SBC.(internally balanced ones).
The same thing can happen if the medium is incorrect, or the ring mass and diameter is incorrect for the particular engine combination.
The Fischer being a clutch/spring type damper means it is probably got a wider ability to at least reduce the torsional vibration.
For a racing application, you have to decide whether the added rotating weight is worth the benefits.
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N/A 10.93@122.31@1785lbs
Blower Mtr 147mph@1870lb
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John P
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« Reply #7 on: April 01, 2011, 02:24:09 pm » |
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Interesting.
What do they weigh?
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'67 Cal-Look Bug
Cornpanzer's
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eduardocastrejon
Junior
 Offline
Posts: 189
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« Reply #8 on: April 13, 2011, 10:27:17 pm » |
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Somebody, please post a photo about it
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Sleeper 64
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« Reply #9 on: April 14, 2011, 08:53:24 pm » |
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I will try to post pictures this weekend.
Mine weighs in at 4.5LB. it is the stock sized pulley with belt grove.
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It might not be fast but it is paid for.
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eduardocastrejon
Junior
Offline
Posts: 189
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« Reply #10 on: April 17, 2011, 11:59:07 pm » |
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Sleeper 64
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« Reply #11 on: April 19, 2011, 01:31:20 am » |
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It helps reduce vibrations from out of balance parts.
It is a true fluid Dampner. Cb's is just a heavy pulley.
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It might not be fast but it is paid for.
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