Just want to put together a simple thread for all to reference to when wanting to replace or upgrade their motor mounts.

If you are wanting to upgrade or simply replace your old motor mounts you should consider this. These bushings are way way better than oem. A great balance between a solid motor mount and the plushy, saggy oem ones. OEM replacements will run you anywhere from $35 - $45 each depending on where you get them from. These bushing will run you $25 each. The OEM bushings also only fill up maybe 2/3rd's of the clam shell wheras the new ones will be a complete snug fit in every direction.

My car is a 1989, and uses the clam shell style motor mounts. I'm not sure what other years use the same mount system so if others would chime in on that i'll add it for all to reference to.

First off the parts you need:

Energy Suspension part number 3-1127R for Red
Energy Suspension part number 3-1127G for Black

You'll be ordering 2 left/passenger side bushings


http://www.summitracing.com/parts/ENS-3-1127R/






First thing you need to do is drill out the old hot pressed spots on the mount to disassemble it. I found that the best size bit to use is a 7/16





After drilling out these you'll need to next pry apart the clam shell. For some this may be easier than others. If you car has any significant mileage you'll need to use some heat. Heat one side at a time, You don't need to get it cherry red, just get it nice and warm.



Pry it apart anyway you see fit or have tools for



I decided to clean them up alittle. Nothing special, just wanted to prevent rust. Wire brushed them down real quick.



Shoot on some primer to cover any bare metal





The paint i used was flat black rustoleum, just to keep the rust from forming anytime soon. You'll then use the provided hardware to attach the two half's together. They provide aircraft nuts so no need for any thread sealant. It's pretty self explanatory as to the orientation of the bushing in the Clam shell. It can only go in one way.







Then Enjoy
-Caleb

 

Great write-up, thanks!

I've got a set of solid engine mounts. I've been toying with the idea of installing them in my '89, but I think they'd be a bit too much for a street driven car. The polyurethane mounts look to be a much better idea. Definitely on my list of things to do now.

Just one side note: in your posting you state Energy Suspension part numbers 3-1116R (Red) and 3-1116G (Black), yet the package in the photo has part number 3-1127R. Which is the correct part number?

 

ANyone know if LTx use the same mounts? Something I always forget and might as well while the motor is out. I did polys on the maro and it was a sweet upgrade. I want solid in the c4 but poly will do just great too.

Also are they the exact same size as oem rubbers? it just looks like they might protrude a bit more from the clamshell. I hope its just the picture but sometimes a little clearance can be important and would hate to run into that problem before dropping the motor in.

 

Awesome. I was just about to buy motor mounts.

Seems like we have the same thing going on at the same time lol. Except you have your engine already. (damn machinist)

 

Thanks for the write up

 

Thanks for catching that

They do fill up the clam shell itself completely in comparison to the oem ones. As far as sticking further out i'm not sure. I'll be putting them in the car in the next week or so. I'll get back to ya on it

lol i know the feeling. I just got my clutch in and of course they send me the wrong disc. Gotta wait yet another week

 

can someone school me?

what are the advantages / disadvantages of:

1. OEM stock rubber mounts
2. polyurethane mounts
3. Solid mounts.

 

The advantages to the stock rubber mounts is that they very effectively isolate engine vibrations from transferring to rest of the chassis. The disadvantage is that a small amount of torque is lost when you accelerate; the whole engine rotates slightly (in the opposite direction of the crank's rotation) when you accelerate, which is lost to the rubber isolators in the stock mounts.

Polyurethane mounts eliminate most of that loss, giving the car a more responsive feel when you accelerate. However, that response comes at a price in that engine vibration isn't as well isolated when compared to rubber.

Solid mounts eliminate all "twisting" loss, and make the car feel incredibly responsive when you mash your foot on the go pedal. But, as you'd expect, there is absolutely NO engine vibration isolation at all - whatever the engine does, you feel it through the whole car!

Polyurethane are the best option for street performance, and even in most race situations. Solid would prove to be difficult to live with on the street at best, especially if the car has a lumpy cam. However, if comfort and quiet cruising is what you like (with the occasional spirited driving session) then the stock rubber mounts are what you want.

 

Exactly right! ^ Couldn't have put it better

Just as a side note i just also put in energy suspensions poly bushings throughout my rear end and these bushing are no where near as solid as those were. I could clank the rear end bushings together and it sounded like two solid pieces of plastic or metal. Hard as a rock. The motor mount bushings were not near as hard. you could push your finger nail into it.

 

The LT1/LT4/LT5 use a different mount, unfortunately. I don't think a poly version exists, as it is a hydraulic (oil filled) mount.

 

Ditto.

The inserts arrived in one day from Summit!