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Lars S
Samba Member
Joined: October 04, 2007
Posts: 786
Location: Sweden
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 Posted: Tue Jul 21, 2015 5:13 am Post subject: NOS shock absorber with no damping on compression..? |
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I have a set of NOS Boge front shock inserts for 412 stored since the '80s (yes I know the seals are probably gone due to time).
When I check them there is wery good damping on extension but almost no damping on compression.
Is this due to it being designed that way or only due to gone seals?
Lars S
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Porsche 914 -72, Bahia Red daily driver 
VW411 2-d -70, White, sold 
VW412 4-d, -73, Gold Metallic, daily driver
Suzuki T500, -69, Candy Gold, sold
Suzuki K50, -77, Black, daily driver
BMW R69S -69, White, sold
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21520
Location: Oklahoma City
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| Posted: Tue Jul 21, 2015 6:04 am Post subject: |
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Sadly.....I would say, that is the seals.
Typically you should feel slightly less resistance on the rebound or extension stroke....because the stock valving was a little in that respect.....however you should have fairly stiff resistance in both directions.
This is the sad thing with NOS struts and shocks.
The only exception...is in the case of NOS factory wet strut cartridges. If you find a set that have no leakage and have the original oil charge in them.....there is only one seal that is rubber and its at the top of the tube and can be replaced. Those last forever on the shelf as long as they are sealed so they don rust and have all of the oil. Ray |
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Lars S
Samba Member
Joined: October 04, 2007
Posts: 786
Location: Sweden
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| Posted: Tue Jul 21, 2015 6:36 am Post subject: |
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Thanks Ray!
Thats what I feared but good to get it confirmed.
Lars S
_________________
Porsche 914 -72, Bahia Red daily driver
VW411 2-d -70, White, sold
VW412 4-d, -73, Gold Metallic, daily driver
Suzuki T500, -69, Candy Gold, sold
Suzuki K50, -77, Black, daily driver
BMW R69S -69, White, sold
Husqvarna 118cc, -47, Black, Sold |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21520
Location: Oklahoma City
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| Posted: Tue Jul 21, 2015 8:14 am Post subject: |
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| Lars S wrote: |
Thanks Ray!
Thats what I feared but good to get it confirmed.
Lars S |
I know exactly which ones you have. The Boge strut cartridges were many times...the most expensive....and the nicest riding...basic replacement shock.
Oddly....I also found them to have the worst shelf life. I bought at two sets of them over time. The first set was known to have been on the shelf for right at four years from the invoice date. They were 1989 cartridges and I bought them in 1993. They lasted about 25-30k miles over less than a year when...the compression stroke failed exactly as yours have.
The second set...I bought from the same parts house in 1995. They were the same age...1988 invoice. the shop owner gave them to me for about $5 above cost (I got them for about $20 each)...his point being that they were old enough to be off the books and he had seen enough other rubber parts, shocks etc....not just Boge products...but also Boge products....that fail from shelf age.
We both knew it was a crapshoot. They lasted right at 3 months. Again, compression stroke failure...and top shaft seal failure. Ray |
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