My dastardly plan to get polyurethane motor mounts

[Lumberg]

So I've seen the threads where people made their own, whether by packing it into the existing rubber structure or burning/chopping the rubber out to make it solid urethane. But I don't like the idea of not being able to drive the car for a while.

The PU I got is cured enough for use overnight and takes 7 days to cure fully, but still.

So I have buddy who owns a repair shop and I am ordering the dogbone and the rear motor mount for my car from a salvage yard. Those two pieces are of trivial cost--Bo says they'll probably just throw those two things in with the next order for free. And presumably, while used, they're not going to give us pieces there the rubber is actually torn up or anything.

So what I think I will do is check the parts out and decide on a plan of action (I'll probably just fill the existing spaces in the rubber, but I am not sure yet). Then I'll create the new bushings, let them cure for the full 7 days, and just do a traditional R&R of the parts.

Mu-ha-hah-ha-ha-ha-hah-hah-hah!

What do you think?

[DressUpYourPet]

Why?

[Lumberg]

Originally Posted by DressUpYourPet

Why?

To minimize the amount of time I am without the use of my car.

[DressUpYourPet]

No...why use polyurethane to mount your motor wont the motor fall out if they break

[Lumberg]

Originally Posted by DressUpYourPet

No...why use polyurethane to mount your motor wont the motor fall out if they break

Oh, I see what you mean. The mounts are still attached the same way, which is with metal bolts. I am talking about the rubber that is in the interstitial space.

[Lumberg]

Check out the spaces in the rubber in this rear motor mount:

and the dogbone


I am likely just going to pack the spaces full of urethane.

Some people hack or melt out the rubber part entirely and re-cast with 100% solid urethane in place of the rubber.

[ModifierMR]

Why do poly to begin with, what are you trying to achive?

All its going to do is make your car vibrate like hell, you will gain absolutley NO performance qualities from this, it will just make your whole car shake more.

I talk from experience, I have 2 solid polyurethane mounts for my front/rear mounts on my MR2. Everytime I come to a stop light everythign rattles like crazy, and I noticed NO change in engine-torque resposnse.

[Lumberg]

Originally Posted by ModifierMR

Why do poly to begin with, what are you trying to achive?

All its going to do is make your car vibrate like hell, you will gain absolutley NO performance qualities from this, it will just make your whole car shake more.

I talk from experience, I have 2 solid polyurethane mounts for my front/rear mounts on my MR2. Everytime I come to a stop light everythign rattles like crazy, and I noticed NO change in engine-torque resposnse.

For me, it's more about durability than performance. I have clearly worn out the rear motor mount. Rather than just think of it as some kind of maintenance I am going to have to do every Xty thousand miles, I'd rather put something in there that's going to at least last longer.

Also, thanks for the tip, I am leaning even more towards hybrid mounts now.

[ModifierMR]

Ah in that case, Yea it may not be a bad Idea if you can live with excess vibrations and all.

[atobe]

if you want them to last a lifetime use derlin instead of poly. but then it's gonna vibrate a whole lot more also

[Lumberg]

Originally Posted by atobe

if you want them to last a lifetime use derlin instead of poly. but then it's gonna vibrate a whole lot more also

derlin? Do you mean Delrin? I used to have guitar picks made out of Delrin.

Can you buy a kit to mix up some delrin so you can form it?

[Lumberg]

So I just researched Delrin, and unless you're talking about something else, yeah NO.

Drag racers use solid motor mounts--that'd be the way to go. I want to have SOME shock absorption and flex in there. It's still a daily driver.