03-12-2007, 02:50 PM
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#1
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Registered User
Join Date: Oct 2006
Location: MD
Posts: 447
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Check those engine mounts
This came off of my 40,000 mile 2000 Boxster S 6-speed. The inner portion of the mount is almost completely seperated from the outer housing. This car has seen several standing-start acceleration runs in competition (ProSolo) so it's not surprising that it's in such bad shape.
Symptoms were a noticable vibration when simultaneously cornering and accelerating or decelerating. Also rough shifting, expecially in cold weather. I do not know exactly why shifting improved as much as it did since the transmission and engine are linked and the transmission is shifted by cables - but it did.
Replacement was not difficult and took about an hour and a half. No special tools required.
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03-12-2007, 03:09 PM
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#2
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Registered User
Join Date: Sep 2005
Location: Minneapolis/St. Paul, Minnesota, USA
Posts: 3,308
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Hi,
Looks like you got your money's worth from that one. Did you check to see what the other one and tranny mounts look like? The give that this one experienced had to come from one or all of those...
Happy Motoring!... Jim'99
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03-12-2007, 03:09 PM
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#3
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Registered User
Join Date: Jan 2007
Location: Texas
Posts: 1,311
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What did you replace them with? Hopefully with some Nylon ones instead? 
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03-12-2007, 03:48 PM
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#4
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Registered User
Join Date: Oct 2006
Location: MD
Posts: 447
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Quote:
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Originally Posted by porsche986spyder
What did you replace them with? Hopefully with some Nylon ones instead? |
Oh my goodness no. You would never want nylon or delrin in this application. You need something with some give. Nylon would probably crack or deform over time. Rubber or urethane is the way to go.
I'm restricted by my competition class rules, so I went with stock. However I do have a spare mount that a fellow ppbb member sent me, which I gutted and urethaned with 80 hardness urethane. I'm going to do the same to the mount that came out of my car.
And yes, the other two mounts are going to get a check this weekend.
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03-13-2007, 06:33 AM
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#5
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Registered User
Join Date: Jan 2007
Location: Texas
Posts: 1,311
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If that's true then why are people always buying these Polyurethane motor mounts and bushings like these? These mounts are designed to limit the travel, reduce the chances of breakage, and put the power to the wheels.
Last edited by porsche986spyder; 03-13-2007 at 06:40 AM.
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03-13-2007, 06:41 AM
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#6
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Registered User
Join Date: Oct 2006
Location: MD
Posts: 447
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Quote:
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Originally Posted by porsche986spyder
If that's true then why are people always buying these Polyurothane motor mounts and bushings like these?
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You said nylon. Polyurethane is NOT nylon. Totally different stuff. Polyurethane would be OK for this application - but as far as I know nobody makes a polyurethane motor mount.
As I mentioned, you can make your own urethane motor mount using the old mount.
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03-13-2007, 07:00 AM
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#7
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Registered User
Join Date: Jan 2007
Location: Texas
Posts: 1,311
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Quote:
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Originally Posted by John V
You said nylon. Polyurethane is NOT nylon. Totally different stuff. Polyurethane would be OK for this application - but as far as I know nobody makes a polyurethane motor mount.
As I mentioned, you can make your own urethane motor mount using the old mount.
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My bad, sometimes I can't remember the correct names/terms of certain parts. And yes, your right, no one makes them for our cars right now. Not sure why, maybe we could get a petition started to have a company start making them for our 986. A company called Motion Control makes some rather nice bushings and mounts.
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03-13-2007, 08:16 AM
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#8
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Registered User
Join Date: Sep 2005
Location: Minneapolis/St. Paul, Minnesota, USA
Posts: 3,308
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Hi,
Polyurethane Mounts and Bushings aren't always a natural substitute for Rubber. In many instances the flexibility of the Rubber is factored into the equation, especially for some suspensions. Firm it up w/ Poly and you can actually negatively impact the function of the piece or system...
Happy Motoring!... Jim'99
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03-13-2007, 09:09 AM
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#9
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Registered User
Join Date: Oct 2006
Location: MD
Posts: 447
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Quote:
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Originally Posted by porsche986spyder
My bad, sometimes I can't remember the correct names/terms of certain parts. And yes, your right, no one makes them for our cars right now. Not sure why, maybe we could get a petition started to have a company start making them for our 986. A company called Motion Control makes some rather nice bushings and mounts. |
One big problem is the market for Boxster parts is pretty small.
It's so easy to take your own mount and urethane it anyway. For $30 in materials and a couple hours of your time it seems a worthwhile DIY.
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03-14-2007, 01:56 PM
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#10
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Registered User
Join Date: Jul 2006
Location: Philly, Niefern DE
Posts: 119
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This is a common upgrade on a 911, check out www.wevo.com for best in class. Maybe we could get them to make some 986 parts like a shifter as well as the mounts.
__________________
Thom
'81 911 SC ROW = The Money Pit
'02 Boxster S = Daily Driver
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03-14-2007, 03:54 PM
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#11
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Registered User
Join Date: Sep 2006
Location: chicago
Posts: 3,510
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how much are new motor mounts anyways?
also, how hard is it to dissassemble whatever needs to be dissassembled to see the condition of them?
thx in advance
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03-15-2007, 02:52 AM
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#12
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Registered User
Join Date: Oct 2006
Location: MD
Posts: 447
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A new mount costs around $220.
The mount on later cars has end caps to prevent the bushing from sliding out of the housing. It makes it nearly impossible to check to see if the rubber is cracked.
On early cars you can probably remove the access panel behind the seats and check the condition.
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