I have a TJ wagon, and it has been suffering very badly from wheel hop, particularly when cornering (hard) to the left.
One of the factors contributing to wheel hop is broken engine mounts.

I had previously had an engine mount re-cast in polyurethane for my Nissan U12 Pintara (http://martybugs.net/Pintara/mount.cgi), with great success, and a reduction in wheel hop. Not only that, but the custom polyurethane mount for my Pintara cost me $60, and should last much longer than any rubber mount (a geunine replacement mount from Nissan would have cost me ~$220).

After noticing the top right engine mount in my TJ wagon was broken, I decided to get it recast in polyurethane.
(Genuine replacements from Mitsubishi were priced at around $240, although cheaper non-genuine mounts are available.)

The broken top-right engine mount:
http://martybugs.net/magna/images/IMG_4082_350.jpg

After removing the rubber:
http://martybugs.net/magna/images/IMG_4093_350.jpg

I used a sharp wood chisel to remove the bulk of the rubber, and then used a rotary wire brush in a drill to clean up the centre pin, and some carving drill bits to remove the remaining rubber from the outer ring.

Note that the sleeve inside the mount can probably be removed (resulting in a circular hole), but I chose to leave it intact, as the raised sections provide plenty of surface area for the polyurethane to bond and key to.

The polyurethane mount, after drilling holes in it to add additional flexibility:
http://martybugs.net/magna/images/IMG_4118_350.jpg

Based on my previous experiences (http://martybugs.net/Pintara/mount.cgi) with polyurethane mounts, I used 65 shore A hardness polyurethane.
Also, to provide some additional flexibility and movement in the new mount, some 10mm holes were drilled around the centre pin.

I'm very happy with the result. Engine movement is significantly reduced, and the new mount has almost totally eliminated wheel hop. The mount isn't too hard, and still provides sufficient isolation from engine vibrations, with no noticable increase in NVH.
It only cost me $60, and it should last longer than any replacement rubber mount.

For more details, see this page (http://martybugs.net/magna/mount.cgi).

Cheers,
Martin.

either that. or there is also some from megatron for $110

http://www.aussiemagna.com/forums/showthread.php?t=9490

either that. or there is also some from megatron for $110

http://www.aussiemagna.com/forums/showthread.php?t=9490

Yup - I'm aware of those.

Does anyone know the hardness of the polyurethane used in megatron's mounts?

(I pm-ed megatron a while ago, asking what hardness polyuethane he was using. He was going to get back to me with the info, but never did...)


Cheers,
Martin.

or there's this

http://www.aussiemagna.com/forums/showthread.php?t=26803

http://www.aussiemagna.com/forums/showthread.php?t=32670&highlight=turbo+charade

or there's this

http://www.aussiemagna.com/forums/showthread.php?t=26803

http://www.aussiemagna.com/forums/showthread.php?t=32670&highlight=turbo+charade

I tried the Sikaflex trick with a mount on my U12 Pintara, but it only lasted a few months ;-(

Admittedly, the Magna engine mount probably has less sideways movement than the mount in my Pintara, and hence a Sikaflex-filled mount should be a bit more robust in the Magna than the Pintara...

Cheers,
Martin.

Yup - I'm aware of those.

Does anyone know the hardness of the polyurethane used in megatron's mounts?

(I pm-ed megatron a while ago, asking what hardness polyuethane he was using. He was going to get back to me with the info, but never did...)


Cheers,
Martin.


sorry mate i thought i did pm you, but that doesnt matter

my mounts are 83 Shore A hardness (Street), 93 Shore A Hardness (Race)

my mounts are 83 Shore A hardness (Street), 93 Shore A Hardness (Race)

Is that the solid mounts, or the later version that has a "biscuit" shaped piece on each side?

I would think that 83 / 93 Shore A hardness would be way too hard for a solid mount that size....

I found that a 70 Shore A hardness solid mount on my U12 Pintara (http://martybugs.net/Pintara/mount.cgi) was too hard, causing excessive vibrations from the engine (idling with the air con on resulted in the whole car shaking...).
A 65 Shore A hardness mount with some 10mm holes drilled in it proved to be much better - still soft enough to absorb engine vibrations, but hard enough to stop engine movement.

As the Magna mount is a larger volume than the U12 Pintara mount, I wasn't sure if 65 Shore A hardness would be too hard.
However, with some 10mm holes drilled in it, my new Magna mount (http://martybugs.net/magna/mount.cgi) isn't causing excessive engine vibrations at all.

Cheers,
Martin.

I've got one of the 83 hardness mounts on the drivers side top and didn't notice any difference in vibrations.

I've got one of the 83 hardness mounts on the drivers side top and didn't notice any difference in vibrations.

Same here and it hasnt missed a beat looks the same as when i bought it and does it's job pretty damn well and if anything less vibrations :)

I've got one of the 83 hardness mounts on the drivers side top and didn't notice any difference in vibrations.
Is that a solid mount? Or the two "biscuit" inserts, with one on each side of the mount?

Cheers,
Martin.

Is that a solid mount? Or the two "biscuit" inserts, with one on each side of the mount?

Cheers,
Martin.
One each side I think.

One each side I think.
In that case, 83 Shore A hardness is probably fine.

However, a solid mount of 83 Shore A hardness would be very stiff, and would result in plenty of engine vibrations....

Cheers,
Martin.