EZFD

So here is my idea for a hybrid motormount setup, since the car is going to be a street car, i want some comfort. I was thinking about using a new OEM mount on the passenger side and on the easily rippable driver's side, an aluminum one. Any thoughts??

alexdimen

iTrader: (13)

even with the other being stock, you're still going to get huge vibrations.

i'd go with the noltec mounts or the home made "polyurethane sandwich" mounts.

EZFD

i was thinking of sandwiching rubber ends on a milled down alum mounts, think it will work?

alexdimen

iTrader: (13)

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/motor-mounts-521858/

aluminum and comfortable street don't mix.

there is also a link in that thread:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/motor-mount-163324/

RotaryWhat?

iTrader: (1)

I worked as an engineer designing hydraulic engine mounts and suspension links/bushings for 5 years and did a lot of vehicle/ride testing as a result. I can tell you definitively that you do not want to unbalance the system by using a hard mount to one side a soft mount to the other---the worst part being that you will tear up your mounting joint and or cradle.

The advantage to using hard mounts: no powertrain hop over rough road or roll during engine torquing--solid feel. The disadvantage: noise and idle shake.

The FD uses hydraulic mounts allowing the use of soft rubber to control idle shake and the hydraulic portion to control engine hop----the design is not however suited to control engine torquing which explains the often ripped stock mounts.

If you want the best comfort---stick with the stock mounts. If you can handle the extra noise and vibration, go with something stiffer like the poly mounts. I went with the Mazdaspeed mounts which seemed like a good tradeoff. My friend has poly mounts for the engine and diff though and I can honestly say that they aren't that much worse, but it is noticeable....