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Motor mount lower plate

 
Old 03-20-2019, 01:12 PM
  #16  
dr bob
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We laugh, but... That fitting was actually used to fill the mount with glycol fluid during manufacturing. Glycol was used to keep it from freezing, or boiling out from the engine heat.

"Modern" cars sit on computer-controlled mounts, little shock absorbing mounts with selectable pathways for fluid to flow inside. The damping is adjusted with engine speed and when cylinders are dropped out of the firing sequence in economy modes. This is one of the critical pieces that the early Cadillac 4-6-8 disaster was missing.

An interesting related bit of trivia: In the early 1990's Ford was having a lot of trouble with motor mounts and engine vibration transmitted to the frame in certain truck models. They finally went to Porsche for some engineering help, where hydraulically-dampened mounts from the (drum roll...) flagship V8 car were proscribed. In typical US manufacturer fashion, Ford went out to suppliers for bid, and the first thing they did was get rid of the hydraulics to save $$. Roger discovered that when the first aftermarket Ford mounts were tested as 928 replacements. The aftermarket pieces were hit-or-miss on whether they were dampened or not. Meanwhile, Ford bought (then sold) Volvo, where the dampened mounts were in use. Fortunately the Volvo really needs the dampened mount, and that keeps the replacements hydraulic so we can use them in the 928. It's a great circle, with only six degrees of separation.
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Old 03-20-2019, 02:03 PM
  #17  
merchauser
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Originally Posted by dr bob View Post
We laugh, but... That fitting was actually used to fill the mount with glycol fluid during manufacturing. Glycol was used to keep it from freezing, or boiling out from the engine heat.

"Modern" cars sit on computer-controlled mounts, little shock absorbing mounts with selectable pathways for fluid to flow inside. The damping is adjusted with engine speed and when cylinders are dropped out of the firing sequence in economy modes. This is one of the critical pieces that the early Cadillac 4-6-8 disaster was missing.

An interesting related bit of trivia: In the early 1990's Ford was having a lot of trouble with motor mounts and engine vibration transmitted to the frame in certain truck models. They finally went to Porsche for some engineering help, where hydraulically-dampened mounts from the (drum roll...) flagship V8 car were proscribed. In typical US manufacturer fashion, Ford went out to suppliers for bid, and the first thing they did was get rid of the hydraulics to save $$. Roger discovered that when the first aftermarket Ford mounts were tested as 928 replacements. The aftermarket pieces were hit-or-miss on whether they were dampened or not. Meanwhile, Ford bought (then sold) Volvo, where the dampened mounts were in use. Fortunately the Volvo really needs the dampened mount, and that keeps the replacements hydraulic so we can use them in the 928. It's a great circle, with only six degrees of separation.
great information. thanks
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