Aw11 polyurethane engine mounts

[Adarewyr]

Hey guys, I was just wondering if anyone had used the polyurethane engine mounts on twosrus, what they're like once they're installed, and any tips for me when I come to put mine in.

[flying_wedge]

Hey guys, I was just wondering if anyone had used the polyurethane engine mounts on twosrus, what they're like once they're installed, and any tips for me when I come to put mine in.

They are easy enough to put in - just have a hacksaw and put the blade through your current mount with the cutting edge facing out and cut nice and straight through the outer metal ring of the mount.
Note, that's the area highlighted in red, don't saw through the whole thing!! Once the tension is released you'll be able to whack it out with a hammer.
Or if you have a workshop press at hand use that rather than my laymans technique.
New mounts just push in by hand.

You'll notice increased engine vibration being transferred to the cabin and car as a whole. Might be for you, might not.
One note of warning is the increased likely hood of cracking the front engine mount as I did - if you do any reading it's likely all AW11's will have this issue eventually, but a 'solid' mounted front engine mount with the urethane mounts would certainly speed up this process.

Matrix Garage do a weld over plate which is excellent at resolving the issue, even if yours is already cracked (or cracks in the future). I can't link the page to Matrix Garage site at the moment as it seems offline, but check again later for his "AW11 front motor mount weld in reinforcement plate"
I don't have any pics of this on mine, but you get the idea.

[Adarewyr]

I'm worried about the vibrations tbh, my whole interior seems to be held in by like two screws so everything vibrates as it is ahah, but thanks man I guess I'll stop stalling and put them in

[Statek]

My car was never a daily, but I didn't notice that much difference when I switched to the polyurethane front and rear mounts. That could have also been due to the sagging OE mounts causing just as much vibration as the replacements

I also had the cracked front mounting point on the chassis after using polyurethane mounts.

[mickeyduck]

I'd recommend buying the full set of mount inserts for all four mounts from matrix garage, and get the ones with the holes drilled in so they are softer. That's what I'm likely going to do. I found the Twos R Us ones a bit hard, vibration a bit irritating. Plus they don't do inserts for the east-west mounts whereas that's part of the Matrix Garage kit.

[NzLHD]

Another alternative could be to make your own poly mounts out of the old ones.
I did this as a bit of and experiment on the front engine mount and it has been holding up very well for just under a year now.

Cleaned out the old rubber with a oxy torch and made a little jig/mold and poured liquid polyurethane in and let it set.

Followed 'driving 4 answers' tutorial on youtube, used smooth-on's Reoflex 60 and colored it with black printer toner.

poly-mounts-diy-featured.jpg (32.42 KiB) Viewed 7236 times

[mknz]

You could just soak the rubber in gasoline

[mickeyduck]

...used smooth-on's Reoflex 60

https://www.smooth-on.com/product-line/reoflex/

Hah - nice. Where did you get it please David, and how much did you use to do one mount?

[NzLHD]

You could just soak the rubber in gasoline

^ saves taking a few years off ya life, haha

Got it from http://www.fibreglassshop.co.nz if you search reoflex it should come up. I opted for the 60 Shore.
$40 for 900g, I used about 400g on the front mount. So less then $20 per mount?

[Mike n Rochelle]

Thanks David I might have a go at that myself. Do they work out soft like the OE or more like the two's r us ones?

[mickeyduck]

I'm thinking the same thing Mike. And if you make them solid I think you'd want them softer... For that reason I'm thinking either 40A or at most 50A Shore hardness. If you make them hollow as per the OEM ones then maybe you'd want 60A or harder.

https://en.wikipedia.org/wiki/Shore_durometer

I've tried the Twos R Us inserts in the front and rear mounts in my AW and found them very harsh with a lot of vibration transferred to the chassis. They are 75A hardness. I don't like the idea of cracks developing in the chassis due to too much vibration so I think something a little softer is in order.

https://twosrus.com/catalog/product_inf ... cts_id=215

Screen Shot 2017-11-12 at 9.14.09 am.png (419.69 KiB) Viewed 7199 times

If I buy the Matrix Garage inserts I'll be going for the drilled ones. They use 80A compound so solid ones would be great for a race car but a bit nasty for extended use.

http://www.matrixgarage.com/products/aw ... -mount-set

Screen Shot 2017-11-12 at 9.12.16 am.png (637.76 KiB) Viewed 7199 times

https://www.youtube.com/watch?v=2_0BYvTkZ0o

[Mike n Rochelle]

Totally agree Charlie I have waited too long for this car to be done and dont want to damage the chassis. I was also looking at the matrix garage ones with the holes but figure I could give DIY a go and see if I have any luck developing my own cheaper an I have plenty of mounts to practice on at the moment. As my car is not by any means done I might have to farm out a set to someone to fit and test for me. If I can make something good I could try to make a jig with all the holes set into it so I could replicate them and find someone with the time to make them as it takes me forever to get anything done unless I have a bunch at a time and run a production line so to speak

[NzLHD]

Thanks David I might have a go at that myself. Do they work out soft like the OE or more like the two's r us ones?

I haven't seen or felt how strong the two's are. the urethane is 60 shore vs the 75 of the two's ones. they are deff's more stiff then the stock ones thats for sure.
Haven't got any significant engine vibrations in the car but I've only done the one mount.

[Mike n Rochelle]

Cool I might have to give that a go.

[mickeyduck]

Found this post on mr2.com by the guy from Matrix Garage. Interesting, though I disagree with his statement about not needing to remove the old rubber as I tried that once and even though I had rarked the surface of the old rubber up a lot, they still just fell apart after a while.

The main thing I get from this is that it'd be a good idea to use a special primer to help the urethane adhere.

I think I'll try 50A though when the time comes. It's close to a standard mount as I understand it.

Anyway here's the guy's post. I'll biff up a screenshot too in case it ever vanishes (I hate things like Photobucket's mess).

Food for thought:

http://www.mr2.com/forums/threads/10826 ... lyurethane