I've heard (and searched) that you can use 2 'black' mounts for the FD. Is this true? If so I need one for my urethane bushings. Any advice?
AJ

 

Yes you can.

"Black" mounts are steel and have the hole thru the center (IIRC) while the aluminum has the hump.

On my poly mounts I would of had to cut the hump of the alum and drill a hole to make it work. I chose to just get another steel mount.

BTW Im not liking my mounts.

 

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/motor-mount-arm-faq-568520/

 

When I bought the poly mounts, I had the one black mount, and the other was with the hump, and rubber attached. Of course 100k+ miles the rubber was barely hanging by a thread. Tore it the rest of the way off, drilled a hole in the aluminum, then had to grind out a large crater in the poly so it'd sit flush. I ended up only having the mounts for a week or two then sold them. Couldn't deal with the resonance and vibrations. Did love the positive feel of take off, and shifting.

 

I'm guessing that you guys that didn't like your poly mounts didn't have the "subframe sandwich" style. That is, with two seperate bushings on the top and bottom of the subframe.

 

you're right. it was all he had at the time. but I don't know if it would have helped enough for me to keep them.

 

Should have went with the smurf mounts ;o)

 

Ever since I put my Exedy Hyper Single in, I can really feel my mounts vibrating now. I also used two passenger side mounts.

 

Solid mounts will always transmit lots of vibration, thats why Mazda didn't use them.

 

Not exactly. You are blaming the polyurethane when the real problem is the bolt that is ridgidly connecting the engine to the front subframe. The problem with most aftermarket mounts is the pass through bolt and puck design. In this configuration the polyurethane only acts as a high frequency oscillation buffer for the bolt; meanwhile the bolt transmits higher aplitude LF oscillations straight to the chassis. This can be aleviated slightly by adding additional elastomer material between the bolt head and chassis, but this puck would need to be rather thick to be terribly effective.

 

yeah, it's the design flaw. wasn't someone making some poly mounts that didn't use the bolt pass through design?

 

There are the noltec mounts (smurf chodes) which are supposed to be the cat's pajamas...

I'm going with the home-made sandwiches if JHB ever sends me those shiny rotor housings j/k I knew there would be a considerable wait.

 

I just bought a second steal mount and using that. I hope the little washer that is between the bolt and the subframe will do the trick of keeping vibration down. If not, lucky for the lady that sits in the passenger seat.