Re: Motor Mounts

[SailingFC@aol.com]

I've used a front "red" poly mount for years(10+) and have had no problems, 
i.e. no excessive vibration, no noise, no harshness.  That is the only poly 
mount I use, though.  All the other mounts are stock factory.  In fact, I've 
had so little(no) problems with this setup, I recently just changed all my 
other mounts when I swap in a 5 speed.  That's 21 years on the original 
factory mounts.  I wasn't having any problems with them, just changed them 
since I was down there.  Now IMO, I have one of the smoothest idleing engines 
that I know of and I'm sure that is a big factor in terms of "comfort" in the 
car.

If you've ever taken off the front mount, you'll notice the engine doesn't 
need any support while doing this.  The front mount is mainly there is 
control rotation of the engine.  All of the weight of the engine is really on 
the left and right mount.  That's why if you change the other mounts to poly 
you will probably get more harshness than when changing just the front, IMO.  
If you keep the rotation in check with a front poly mount, the rest of your 
mounts should last a long time.

GL

-Dick-
78 Scirocco
Original Owner
http://members.aol.com/sailingfc/


In a message dated 9/18/99 12:34:21 AM Pacific Daylight Time, 
kat1127@hotmail.com writes:

> I am currently replacing the motor mounts in my '79 Scirocco.  As usual, 
>  after purchasing the stock mounts, I acquired new information, and started 
>  lusting after the bigger and better version.  "Preformance" mounts, i.e. 
>  polyurethane.  After reading what several different books had to say, I 
>  started to shy away from the idea, because of the increase in ride 
>  harshness.  Then, I got other info, which stated that the front mount, was 
>  worth replacing with polyurethane plus wouldn't cause a major increase in 
>  harshness.
>  I ended up replacing the front mount with a polyurethane "Bug Pack" mount, 
>  resulting in slightly less engine vibration when I turn the car off, but 
not 
> 
>  too much else.
>  
>  What I am wondering now is if the one polyurethane mount had negligible 
>  harshness, what would replacing the side or back mounts with polyurethane 
>  do.  If not all of them, some.  Also, if I just replace one or two of 
them, 
>  which mount would I choose to have the extra stiffness?
>  
>  Also, I was hoping in replacing the mounts, that the vibration when I turn 
>  the car off would stop.  I realize I've only done one mount, but the other 
>  mounts aren't in terrible condition (the rubber has started to deteriorate 
>  and slightly erode away), so am I way off line to think replacing my 
mounts 
>  would solve the vibration, or am I just being to impatient?
>  
>  And....(bear with me), on the subject of polyurethane, does anyone know 
the 
>  pros and cons of replacing other rubber components with polyurethane ones? 
 
>  I am quite interested in finding out, because I have recently become 
friends 
> 
>  with someone that works at a VW parts store, and now I get all my parts at 
>  cost =p =p!  Shocky Jr. is quite happy about it too.
>  
>  I'm heading home right now to change the rear motor mount (patience is 
>  definetly not one of my virtues), so hopefully I'll fix, at least 
partially, 
> 
>  my vibration issue.  Sorry about the excessivly lengthy email.  Its lonely 
>  here in Seattle at 12:40 am.

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