The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: Greybeard on 16.12. 2019 09:49

Title: Shock absorbers on a plunger!
Post by: Greybeard on 16.12. 2019 09:49

What do you think about this?

Title: Re: Shock absorbers on a plunger!
Post by: muskrat on 16.12. 2019 11:22

G'day GB.
That looks like handy work by a duTchman. The colours give it away!
Cheers

Title: Re: Shock absorbers on a plunger!
Post by: Greybeard on 16.12. 2019 11:25

I think this was a B31

Title: Re: Shock absorbers on a plunger!
Post by: Rex on 16.12. 2019 13:27

Seems a bit OTT. Plungers seem to struggle deflecting 1/2" or so let alone going into oscillation mode.. *smile*

Title: Re: Shock absorbers on a plunger!
Post by: Greybeard on 16.12. 2019 15:30

Quote from: Rex on 16.12. 2019 13:27

Seems a bit OTT. Plungers seem to struggle deflecting 1/2" or so let alone going into oscillation mode.. *smile*

Mine frequently fully compress when I hit a pothole, with a hidious jolt to my back!

Title: Re: Shock absorbers on a plunger!
Post by: Rex on 16.12. 2019 15:55

But then a shock absorber (damper) being added wouldn't necessarily stop that anyway. Are there internal springs inside the dampers I wonder?

Title: Re: Shock absorbers on a plunger!
Post by: Greybeard on 16.12. 2019 16:10

Quote from: Rex on 16.12. 2019 15:55

But then a shock absorber (damper) being added wouldn't necessarily stop that anyway. Are there internal springs inside the dampers I wonder?

I feel that the hydraulic damping would be an improvement.

Title: Re: Shock absorbers on a plunger!
Post by: RDfella on 16.12. 2019 17:46

"Mine frequently fully compress when I hit a pothole". Need to lose some weight, Neil (only joking, I'm 16st)   Doesn't take much of a road imperfection to hurt my back on my rigid M21 even though I keep tyre pressures as low as poss - 18psi for rear, 20 for front.

Title: Re: Shock absorbers on a plunger!
Post by: muskrat on 16.12. 2019 18:35

Quote from: Greybeard on 16.12. 2019 11:25

I think this was a B31

I see another pipe on the other side.
C'mon duTch, fess up.
Cheers

Title: Re: Shock absorbers on a plunger!
Post by: Greybeard on 16.12. 2019 19:39

Quote from: muskrat on 16.12. 2019 18:35

Quote from: Greybeard on 16.12. 2019 11:25

I think this was a B31

I see another pipe on the other side.
C'mon duTch, fess up.
Cheers

Oh yes, I didn't see that.

Title: Re: Shock absorbers on a plunger!
Post by: duTch on 16.12. 2019 23:49

 

Quote

.....That looks like handy work by a duTchman. The colours give it away! .....

Quote

... C'mon duTch, fess up.
Cheers..

 Not this little blue duTck *smile* wrong shade of blue....
 I had springs made and took a while to calculate the spring rate I needed but they worked out ok and it only bottoms out on serious holes, off which there are *MANY*..... There's only~ 50mm maximum travel
 I think I asked if anyone has the standard spring dimensions but can't remember if I had success....

Title: Re: Shock absorbers on a plunger!
Post by: Triton Thrasher on 17.12. 2019 07:42

Shouldn’t the pillar be greasier than that?

Title: Re: Shock absorbers on a plunger!
Post by: Greybeard on 17.12. 2019 10:00

Quote from: Triton Thrasher on 17.12. 2019 07:42

Shouldn’t the pillar be greasier than that?

Additional damping?

Title: Re: Shock absorbers on a plunger!
Post by: muskrat on 17.12. 2019 11:05

G'day duTch.
Sorry mate, I would have put money on it. Isn't your bike blue on one side and red on the other?
Cheers

Title: Re: Shock absorbers on a plunger!
Post by: duTch on 18.12. 2019 03:16

 

Quote

...Sorry mate, I would have put money on it. Isn't your bike blue on one side and red on the other?.....

 Weeeel yes,no,and yes.... But the frame is different shade of blue- mine much lighter....

 PS I'd feel guilty taking candy from a baby  *smile*