urethane motor mounts?
 

I did a search but could not find anything substantial on who does this or how hard it would be to do yourself.
Anybody know? Is there a way to buy bulk urethane to make a mount out of? I heard of a place that makes them but I can't find the post. At 250 a pop for another stock mount that will just break again does not make any sense to me at this point.
Thanks,
Cliff

Check with RotorSports racing.

Here's a link to their web site, which has'nt been updated in a while. I would give them a call.

http://www.rotorsportsracing.com/

Thanks,

Here's Bryan Smith's reply to my inquiry regarding urethane motor mounts for the FD Rx7s:

Emmanuel,
Due to the common failure of the factory FD series engine mounts, we have developed a cost effective and superior engine mount. Ours are re-manufactured with a high density urethane bushing contained within a sleeve and utilize the stock SS band. A Grade 5 bolt mounts the assembly to the chassis subframe and there is a SLIGHT increase in vibration transmitted into the cabin. We have actually only had 2 complaints- 1 owner had a totally stock 5-speed FD, the other owner had a automatic version with an engine torque brace installed. For owners with a modified RX7 the vibration increase is much less than what most aftermarket exhaust systems produce. I have attached a photo of our mounts- Cost is $140.00 each exchange plus shipping. You can send yours to us for refurbishing and avoid a core charge or we can ship them to you- we do charge a $75 core charge per mount (refundable when we receive your old ones). We regret charging a core fee but our first 12 sets we sold on good faith and only received 3 sets of cores back. Currently we do not have any mounts available but we will have several sets ready to ship by 6/7/02.
Please call or contact me if you have any questions

Regards,
Bryan Smith
RotorSports Racing
(704) 933-6222
www.rotorsportsracing.com
RotorSports Racing
(704) 933-6222

Urethane Motor mount pic
 

Close up pic

Urethane motor mount, zoomed out pic
 

Zoomed out pic

I have these mounts on my car. They make the trans very tight when shifting, very nice. They do increase the vibrations down low 1-2K. When I first put them on they vibrated a whole lot infact I really hated them. After about a week of driving they softened up considerably. Now there is very minimal vibrations. After they softened up I rechecked the bolts under the subframe and they were still fine. Note: I also have a torque brace. In the end I would do it again and brian and his wife are very plesant to deal with. Not to mention they can deliver. When you call and place an order its not an empty black hole best of all they return phone calls. I had to wait almost 1 month for mine and he called me the day they arrived. Very nice guy.

Just my 2 cents
Chris

manatecu,

Sounds like a great product!

I have an immediate need, so I cannot wait a month to have my motor mounts replaced. This product would be a great option for those who can wait though:)

I had to wait a month because they were out of stock and the vendor that was doing the ureth. cutting for them was moving. I think my case was isolated. Give them a call these are something they keep in stock all the time. Brian told me that he replaces them on 90% of all motor work he does.

chris
:D

polyurethane
 

wont these mounts eventually start squeeking and require regreasing ?

I got my mounts done while my motor was out of the car, I sent them in and got them back in 1 week as promised, the quality of the urethane is very good, I can't wait to install them, as far as them squeaking, that's not gonna happen due to the fact that it's not a suspension type of a mount they're there just to support the engine. I had previously had solid custom motor mounts on my last FD and I loved the way that there was no motor or transmission flex, but I hated the vibrations that it caused throughout the car, these are the best alternatives I could find and are probably the best way to go with if you need better than stock mounts, imo.

still around...?
 

I am looking to upgrade my motor mounts to http://www.rotorsportsracing.com/ urathane mounts but I am not getting a reply from the emails on the site?
(Bryan@rotorsportsracing.com or Tiffany@rotorsportsracing.com)

Anyone know if they are still raound, still making the mounts?

thanks.

Bryan was out of town last week and got behind on his emails I spoke to him this tuesday and he will have another batch of mounts ready to go next week but I think you need to send your old ones in first as he's out of cores. He promised me mine on Wednesday the 18th. I'll let you all know. He comes highly recommended from my racing buddies and one of his suppliers I spoke with.

Jim

Thanks for the info Jim, let me know how it goes with your mounts. Are you installing them yourself? If yes, then can you give me a basic idea on how you are doing it? (entire engine out, just jacking up the engine, hoisting it, et, et)

with a bar and a block of wood you can remove them. I did after breaking one of the bolts by torqueing it down too hard. *oops* An engine hoise makes it easier.

K

I got this mount. Vibrates big time. I gets lesser as times goes. but feels like engine strapped to your seat...
like gokart

reza, can you describe the vibration a bit more... and how much did it go away and how long did it take to go away...

but it did get rid of a lot of the drive line slop like you mentioned, right? that is my goal.


thanks

Damian, I had my tranny out so it was no problem to get lots of lift (I'm also redoing the sealant on my oil pan). I put a bolt through the beam in my garage and used a turnbuckle to lift the engine about 4". I undid my intercooler pipes and turbo solenoid piping so they didn't get tweaked by the lift. Guys on the board say they can get enough lift to do the pan with the tranny in but I had to go well above the point necessary to get the mounts out to get the pan through the crossmember with out dropping the subframe.

Jim

I have had mine now for 6 months and I have no vibration. When they were first installed the vibration was horrible. The entire car vibrated but only at idle. Regular driving was ok. The tighten up the train a lot. Each week of driving they seem to get softer. In about a month they don't really vibrate anymore. 2-3 months there is pretty much zero vibration, your back to stock. I would recommend them but just be warned they will vibrate at first so be prepared, but it gets better. Brian is also a very good person to work with. He will return a call when he says he will and ships ontime, I call that the no BS treatment. Infact I was so impressed with my treatment when my motor blew I let him rebuild it and never set foot in his shop, all done via mailorder. 3 months later I am still very happy.

Chris

So anyone care to explain why the vibration is bad at first and then lessens as they "break in"? I'm just curious why this would happen. Perhaps the polyurethane is getting slightly deformed in the same shape as the vibrations, allowing small amplitude movements without transmitting them?

So the vibration goes away, but when you mean 'back to stock' does that also man the tight drivetrain goes back to a sloppy stock feel again too?

I just got them for about 2 weeks. I don't daily drive.
They got softer, I can feel it, but still vibrates between idle 850rpm to 1500rpm, after that its soft.

I expect the vibration to dissapear.

It vibrates as if you are driving on tractor or tank tracks on solid road...The whole car vibrates...
Uhm also feels like massage chair at those rpm...

Reza

I have solid aluminium motor mounts and the results have been great. I don't notice any real excess vibration either.

No the train does not go back to being sloppy. The only thing that stops is the vibration. I went one step farther and added a torque brace and my train is SOLID, with no vibration.

Chris
https://www.rx7club.com/forum/attach...postid=1098731

hmm, good to hear manatecu, a solid train with no vibration is exactly what I am looking to acheive