where to get Polyurethane motor mounts?
 

Hey, anyone know where to get polyurethane motor mounts for a 1st gen? I know somebody must make them.... thanks!!

~Jesse:D

Not sure, however a friend with a Maxima did this:

Most motor mounts have holes in them to allow the rubber to flex. He filled the holes with a liquid polyurethane which hardened and made almost solid poly mounts...

I think the stock mounts are just thin rubber since the Rotary engine is smooth enough that it won't shake the chassis. I've never seen aftermarket mounts available.

Just get or build a torque brace or cable.

I tried solid mounts and didn't like them. I'll be trying the cable method soon.

who sells the strut tower brace with an torque brace built in? i saw it once but forgot where

what aspect of the car would improve by changing the engine mounts?? (not a smart ass question, i just got no idea about this)

sure, the rotary is smooth, but it blew so now theres a small block chevy jumping out of the car everytime i hit the gas...

Thanks, Pele, any idea where to get the liquid stuff?

Check out PST, or Energy for small block poly mounts, I don't know of any companies that sell them for rotaries though, sorry.
http://www.p-s-t.com/

In other cars I've put hardened motor mounts in, it's done a lot for throttle response, both on and off the gas. Theoretically, you'll get more torque to the wheels, as there will be less lost with the engine twisting, but I think the biggest thing I've felt was the throttle response change.

Hopefully in a couple weeks, I'll find out what going from 21 year old motor mounts to new stock mounts feels like.

You have a SBC that uses the stock mounts? Interesting. I thought most of the kits for V8's replaced the crossmember...

I don't remember where to get the liquid stuff, but I'll get a website for you when I can.

EDIT: That was quicker than I thought... Apparently he was online. Dig it:

www.mcmaster.com Look for product 8644K11

You waste a little bit of power as you twist the enigne back and forth on launches, especially hard launches... The engine twists because the rubber flexes. Nobody makes a mass production track car, so they're not designed for hard launches all the time. Most cars are designed for comfort on the road. Therefore, they want to reduce vibration from the engine from shaking the whole car... That's why stockers are rubber.

Try this sometime. Don't do it too much or you're trash your clutch or torque converter...

Automatic transmission:
Open the hood and Start the car and hold the brake. Put it in drive. See the jump? While holding the brake as hard as you can, rev the engine a little. See the twist? Put it in reverse. Again, it jumps a bit. Rev and it'll twist a bit.

Manual tranny:
Open the hood and Start the car and chock the wheels or have the parking brake on all the way. Put it in 1st. Slowly let clutch up while adding gas as if your'e gonna launch. See the twist? Try launching in reverse.

You can also use these methods to test the mounts... If the twist is excessive, replace them... On my friend's Caravan, and on my honda, the mounts are so trashed on hard launches, the engine hits shit... I can hear the intake manifold hitting the hood sometimes when I drop clutch... It's pulled off vacuum hoses at times too.

Yup, for some reason the conversion kit i got still uses the 13b mounts.... seems a little silly, but as long as they hold.. Any idea if the stock mounts have a safety, ie if they break, they just make noise but stay together? Just wondering, thanks~

~Jesse

Pele, were you really drifting your civic? thats terrible :)

Why is it so bad? It's a Civic It already has $1200 in body damage, whats a few more dents?

I don't do it TOO often, usually when it's wet out...

I'd rather not have to do any more body work on the RX-7 after I get it back on the road from putting the front end of it into the back end of a Corolla.

Thanks for the link, i may have to order some of this goo... :) $23 for a lb eh?

~Jesse

Well, for anyone interested, i've decided against that casting compound because it doesn't do everything i need it too, it would only stiffen up the mount. Instead, i think i'll get some new stock mounts, and make some kind of torque strap, my friend made one for his grand national and it seems to work great.. Thanks for the help guys :)

~Jesse:D