Aw11 polyurethane engine mounts

[Adarewyr]

Hey guys, I'm under my car changing the alternator belt, and I've got my new mounts here, do I just take each engine mount out one at a time and insert the new poly mount, or do I need something to support my engine? Also are all four poly inserts meant to be the same size or are two significantly bigger?

[mknz]

Put a piece of wood ontop of a jack and support the engine and gearbox, especially for the left and right ones

[GDII]

What mknz said. The front and back mounts are only there to stop the engine rotating when it's running. The left and right mounts hold the engine and gearbox in the car. So the whole engine and gearbox are only held in by 2 bolts.

[MR2GUY]

I've been running the speed source ones for about two years now, can't complain. I daily my MR2. They make my exhaust rattle a little more, but that's because it is missing the middle mount. Just tighten things down and they are fine, though my cars pretty loud and obnoxious anyway. And hey if things break then you just replace and upgrade right, make sure they never break again

[mickeyduck]

I've been running the speed source ones for about two years now, can't complain. I daily my MR2. They make my exhaust rattle a little more, but that's because it is missing the middle mount. Just tighten things down and they are fine, though my cars pretty loud and obnoxious anyway. And hey if things break then you just replace and upgrade right, make sure they never break again

Nice to hear you seem to be onto a good source of inserts there Cam.

I'm going for nice soft stuff though as the race grade mounts and suspension in my red SW have cost me far too much time off the road due to breakages resulting from the car being on the road (as opposed to a track or drag strip).

Scored some 44 Shore hardness urethane today from https://www.fibreglassshop.co.nz/pages/contact-us to rebuild our AW SC mounts.

Will make them solid, no holes. Should be interesting. I want to see if soft urethane can make durable solid mounts that are easy on the chassis and vibration free. Won't know the outcome for a while of course. But you can rest assured they will be torture tested just about as much as an AW's mounts can be... Mu ha ha...!

And if they fail I'd rather they did so than have the chassis crack. Can always rebuild them with firmer urethane if it doesn't hold up. But if it does hold up, AWesome.

We'll see...

[mickeyduck]

Right then. 44A Shore hardness urethane turns out to be WAY too soft for engine mounts.

http://mr2.org.nz/phpbb3/viewtopic.php?p=137117#p137117

But it is perfect for making moulds. So we might use it for that, and cast ourselves a bunch of inserts from harder stuff instead. Might try 60 grade first and see how that goes.

Also, it seems urethane doesn't really want to stick to steel even if it's been cleaned and rarked up. Especially the pins. However Ados F2 glue seems to do ok. But we'll score some "Shoe Goo" off Trademe and try that (as recommended by Matrix Garage). http://www.matrixgarage.com/content/ins ... tor-mounts

[NzLHD]

The guy that made the first video posted a followup video about how the mounts are doing... Plus a Detailed comparison.

[MIKEP]

Hi Charlie

As you know we cast this stuff all the time> Ive attached a handy hardness chart for you that explains shore Hardness . My feeling is that you will need closer to an D70 Hardness which h as the chart says is what skate wheels are made of. Anyway here it is for reference

[mickeyduck]

D70 Mike? Yoiks!
Would be great in a race car but hell on a bumpy back road, surely?

Matrix Garage use 80A
And offer them drilled to soften them a bit.

The SpeedSource ones sold by Twos-R-Us are 75A.
I've tried them and consider them too hard.

I'm going to try making some 60A inserts Mike, and if they are too soft then I'll just make some harder replacements.
The old rubber I pulled out of the OEM mounts feels a lot like tyre tread, and they aren't solid either, they have hollow sections so they can flex. So I'm hoping solid 60A inserts work out. We'll see...

ShoreHardnessChart-MP.png (571.08 KiB) Viewed 6382 times

[MIKEP]

Sorry your right Charlie I meant A70. If you can get the cure right and vibrate the part to debubble it then the shear strength is better and it performs a lot better.Anyway good luck.lmjust trying to finish the 3D tool to make some Aw11 eyebrows of some
80 D black

[mickeyduck]

If they work out ok Mike, I'll be into 2 sets of eyebrows mate. Good idea making them from urethane too. Nice and tough.

I wish someone would make new front lips from urethane too. In fact an Aerotech lip made from tough urethane would be AWesome. Somebody, hit them up!

[Barark]

The twos mounts do front and back, and i have found them pretty good, anyone know what i fit into the side mounts?

[vrtigo]

Have had poly mounts in two AW11's, one set of which, at least, came from twosrus. Great upgrade, very happy with them.

The cracked front mount happened to me once. Welded it up, no more problems

The side mounts just take the original OEM inserts, though you can cast your own poly inserts yourself.