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Hydraulic Bushings |
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CamJam 
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Joined: Jan/04/2014 Location: Arizona Status: Offline Points: 6553 |
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 Topic: Hydraulic BushingsPosted: Dec/12/2018 at 10:41am |
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Luxury cars like BMW and Mercedes use hydraulic control arm bushings. They provide excellent noise and vibration isolation. The down side appears to be that they don't last long. I know from personal experience and from following the BMW forums that they often need to be replaced by 70k miles because they start leaking. Nevertheless, the ride and noise reduction they provide seems like they could be a real improvement for our noisy old cars that don''t get driven much (though rubber or urethane are better for performance applications). Does anyone know if there are aftermarket hydraulic bushings to replace popular sizes of original rubber ones? Strut rod bushings in particular seem like they could be a good application for hydraulics.
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'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST '69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD  |
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304-dude
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Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Posted: Dec/12/2018 at 11:50am |
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The dynamics of the strut rod will allow undesired steering slop when hitting pot holes and bumps. Plus it would require speed sensitive active management.
IMO if you want a soft ride change shocks, springs and keep the rubber bushings. If you want performance stiffen up with springs, shocks and performance links or poly bushings. If you want both by a new Caddi, BMW, Audi, ... etc. Audi took care of the mess, and in the 80s designed a suspension that was all hydraulic, no shocks, no bushings, nor struts. The computer adjusted a hydraulic piston for road conditions, bumps, and cornering. The oddest thing about it, was that in a turn the car would lower one side slightly and raise one side to make a banked turn to compensate for lateral forces doing the opposite to a normal suspension. Practically impossible to lift a tire off of the tarmac in a hard turn.
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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CamJam
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Joined: Jan/04/2014 Location: Arizona Status: Offline Points: 6553 |
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Posted: Dec/12/2018 at 12:04pm |
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Point well taken, though note what I am referring to are simply passive bushings that contain internal fluid chambers rather than any sort of active hydraulic management.
I don't care for poly bushings in most street applications. Though I do have some poly on my AMX, I went with OEM rubber when I rebuilt the Javelin suspension. Edited by CamJam - Dec/12/2018 at 12:07pm |
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'73 Javelin 360 (current project)
'72 Baja Bronze Javelin SST '69 Big Bad Orange AMX (2018 Teague Heritage Award) SOLD |
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304-dude
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Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Posted: Dec/12/2018 at 12:26pm |
Being all new rubber, the suspension should be the best for driving and mild performance. I just got my poly kit in recently, though I will install them after the car 8th complete and on the road, as I want to test my modified poly strut rod setup with rubber, and then do the lower arms. Once I see how much one effects as I go, I will finalise with upper poly. I assume the upper poly will show more jarring than just lower poly.
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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farna
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Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19689 |
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Posted: Dec/13/2018 at 6:10am |
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I don't think there are any aftermarket hydraulic bushings. You'd have to get some BMW or Mercedes bushings and do some fab work.
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Frank Swygert
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CamJam wrote: