DIY Semi Solid Engine Mounts - modded OEM mounts
#16
#18
Drifting
Join Date: Mar 2011
Location: Bastrop By God Texas
Posts: 2,255
Likes: 0
Received 4 Likes
on
4 Posts
The stock 996 Turbo mounts are definitely hydraulic. I cut one of mine open after I replaced them with the X73 mounts. The X73 mounts are visually identical to the stock mounts, but are a lot stiffer. I had assumed they are also hydraulic, but I'm not cutting one open to find out.
#19
The stock 996 Turbo mounts are definitely hydraulic. I cut one of mine open after I replaced them with the X73 mounts. The X73 mounts are visually identical to the stock mounts, but are a lot stiffer. I had assumed they are also hydraulic, but I'm not cutting one open to find out.
Did you feel any difference between your original stock mounts and the x73 mounts?
#20
Drifting
Join Date: Mar 2011
Location: Bastrop By God Texas
Posts: 2,255
Likes: 0
Received 4 Likes
on
4 Posts
I'm not sure how much of that was worn stock mounts and how much is stiffer X73 mounts. However, I chould hold the old mount in my hand and easily flex the threaded shaft around in the mount. I couldn't budge the shaft on the X73 mount.
BTW. I installed the mounts 2 weeks before the shocks and springs, so I got a very good read on the difference just the motor mounts made. It was significant.
#21
Bump. Any updates on if it's still holding up good?
One thing I'm still not 100% clear on is if there is a potential for the rubber cup portion to decouple from the metal housing and shoot up since the metal cap is no longer there.
Also important to note is to get 80A rated Polyurethane as their are several designations of which the two most used are A and D ratings. Different stiffness even though it's the same number depending on if it has the A or D designation.
Another source to get varying durometer levels of Polyurethane is McMaster. http://www.mcmaster.com/
Thinking of going this route soon.
One thing I'm still not 100% clear on is if there is a potential for the rubber cup portion to decouple from the metal housing and shoot up since the metal cap is no longer there.
Also important to note is to get 80A rated Polyurethane as their are several designations of which the two most used are A and D ratings. Different stiffness even though it's the same number depending on if it has the A or D designation.
Another source to get varying durometer levels of Polyurethane is McMaster. http://www.mcmaster.com/
Thinking of going this route soon.
#22
Racer
Thread Starter
Yes, holding up very well. I've done a couple thousand miles and several autocrosses since installing. I'd like to go stiffer, so I'm working on another set using slightly harder 90A urethane.
The metal cup is not structural - it's only purpose is to protect the pre-existing rubber enclosure for the hydraulic fluid, which I remove.
It's also important to note that older mounts sag, and so it's necessary to make a jig to relocate the stud relative to the housing before filling. I took measurements from a brand new OEM mount and will construct and utilize this jig for my next set of mounts, ensuring perfect fitment.
The metal cup is not structural - it's only purpose is to protect the pre-existing rubber enclosure for the hydraulic fluid, which I remove.
It's also important to note that older mounts sag, and so it's necessary to make a jig to relocate the stud relative to the housing before filling. I took measurements from a brand new OEM mount and will construct and utilize this jig for my next set of mounts, ensuring perfect fitment.
#23
Rennlist Member
The original mounts allow the motor to sag. When I installed RS mounts I realized the engine was lifted higher in the chassis. The RS mounts are not great at keeping a low center of gravity as a result. (lowering the car helps obvuiously) So, your mod actually keeps the height of the engine as low as stock but stiffens the movement of the motor. Pretty cool.
#25
The original mounts allow the motor to sag. When I installed RS mounts I realized the engine was lifted higher in the chassis. The RS mounts are not great at keeping a low center of gravity as a result. (lowering the car helps obvuiously) So, your mod actually keeps the height of the engine as low as stock but stiffens the movement of the motor. Pretty cool.
#27
Instructor
I have the RSS mounts in my C2 and really like them. That being said if the Function First mount would have been available when I did mine I would have bought those. Based on the quality of their trans mount I think their engine mounts would be a good option.