engine mount experience

[Rebel1]

Whiteline have an after market LS mount"

http://www.clubcobra.com/photopost/d...nts_Small_.JPG

[Zedn]

Originally Posted by Rebel1

Whiteline have an after market LS mount"

http://www.clubcobra.com/photopost/d...nts_Small_.JPG

I havnt seen those before. Quick search says they are around $300. Thats pretty similar to what i am going to make.

Bushes from supercheap auto are about $30, i already have heaps of 5mm steel and i just need a couple of bolts and a small bit of pipe. Should be under $50 in materials.

I was just a bit concerned because of the way nolothane bushes tear and crumble. Worried about how long they will last.

[Rebel1]

Originally Posted by Zedn

I Bushes from supercheap auto are about $30, i already have heaps of 5mm steel and i just need a couple of bolts and a small bit of pipe. Should be under $50 in materials.

I was just a bit concerned because of the way nolothane bushes tear and crumble. Worried about how long they will last.

Frankly, I would suggest you make them myself. Indeed, this is exactly what I did because I wanted a mount with a different vertical height above the side rails. ie. get a better tail shaft alignment to the diff pinion.

The whiteline units are made to replace the Holden round donut type unit which has shown some shearing problems. ie. The standard holden mounts are great for NVH issues but have little resistance to lateral movements.

If you search on LS1.com.au I think you'll find these (Whiteline) are very reliable. Providing you protect them with the GM heat shields.

[Rebel1]

Should also mention the whiteline units look fairly "small" in that pic but they are quite substantial mounts.

The bolts you see are all 10mm. The inside of the urethane bush has a steel sleeve which increases the diameter of the metal support surface area inside the urethane bush. Did I explain that correctly?

Gawd...just noticed the pic clearly shows that bush. )

[400TT]

Urethane would be the best choice for your application.

I expect you have already thought about this stuff, but as some positive reinforcement:

* Use quality brand Urethane bushes.
* Use a common enough size/application Urethane that it can be replaced years down the track if required.
* Substantial enough for the application.
* Make sure the design has failsafe in case of Urethane breaking/tearing.
* Make a solid version or sold insert to replace the Urethane for when you are aligning the mounts on your chassis, you want the Urethane mounts to be unstressed.
* Be consistant in your mounting, make sure the gearbox mount is of a similiar material/movement/design.
* Make the mounting system strong enough to future power upgrades, Cobra's only get more power, a huffer etc.

For our mid-engine applications we use pair front Urethane mounts, pair Urethane mounts off the bellhousing/adaptor plate and Urethane gearbox mount. So all up 5 - 6 mounts. Enough to limit drivetrain movement to an acceptable level as it seems everyone is in the 500-800HP bracket these days or planning to be.

[Zedn]

Thanks for those points Craig.

The solid mount for mock up is a good idea that i hadnt thought of.

The bushes i am looking at are for lower control arms so should be substantial enough.

Cheers.

[Rebel1]

Excellent post Craig ... Point 5 (solid insert) for initial fab of the mount is very important. We spun up an alloy insert.

Another point I would make is ensure the side cheeks of 1/2 mount without the urethane bush is at least the same diameter as the OD of the bush.

In other words the whole urethane bush is covered at the ends.
Zedn, rather than purchase lower control arm bushes you might try whiteline for the replacement bushes for their mounts.