View Full Version : detail of my home made urethane motor mount $40

05-22-09, 05:30 PM
only complicated part is finding the shore 80A 2 part urethane, mix it up and pour into your mold

no i dont have a hardware list etc. just do what you see. :)

mount top and bottom studs to a plate, notch the tacked washer so that urethane will go between the cuts and keep from spinning

i used 2.5" exhaust tube cut to the motor mount lenght.. i believe i used 3 5/8" tall myself. try tocenter this stuff on the studs. tape the bottom section to keep it from leaking out of your poorly cut exhaust tube.. dunk the top in and spin it around a bit to make sure no air is trapped under

wait longer than i did to pry it apart, be patient. try some grease on the surfaces so it will separate easier, i will next time around, it was a bitch to disassemble the mold

i also had to cut the exhaust tubing off of the mount



works perfectly, much less vibration than my original home made mount

05-22-09, 05:39 PM
Great Design man, clear out your PM box...I tried to PM you.

05-22-09, 06:07 PM
Just a thought, but, with it sitting higher than either the stock motor mounts or the polyurethane motor mounts, due to the incompressability of the basically all-metal construction, would it have changed the drivetrain angle enough to have introduced vibrations in the drive shaft?

your maker
05-23-09, 09:56 AM
nice work now for the big test let us know how it handles

05-23-09, 10:34 AM
sorry, can only hold 10 messages at a time :rolleyes: that happens pretty fast

well i ran the car last night and my best pass was a 13.0. everything seems fine i'll get under there and have a look today.

i 'believe' that the first design mount was just too firm, not that it sat the powertrain at a bad angle.

05-23-09, 05:46 PM
It looks like the notched washer is only about 1/2" down from the top? Is that enough urethane to hold the stud together?

I guess only time will tell.

05-23-09, 06:20 PM
compared to no washer at all on the $430 version i figured i was far ahead of the game, you are right tho time will tell.

05-25-09, 11:32 AM
i made 4 passes in the car friday night, checked the mount out yesterday eve.. still fine.

05-25-09, 03:39 PM
Wow UUC mounts are over priced, looks great!!

How bad were the vibrations on your solid mounts, im getting a set from RC.. how bad is it really

The Tony Show
05-25-09, 04:45 PM
Probably pretty bad if he did these new ones after all the work on the first design. :suspense:

05-25-09, 05:28 PM
The previous mounts that mightymouse made might look similar however they will not be directly comparable. He used control arm poly bushings which run a shore hardness of about 90-95A and are also a solid bushing. The bushings that I am using run about a shore 80A and have reliefs where the dowel slides through. I am not saying that you're not going to feel vibrations. I am just saying they really are not directly comparable.

06-18-09, 09:19 PM
revisited again!

by now there are plenty of folks out making mounts. i made another one for myself.

this time i went with shore 94 a (stiffer than original 80) from the same devcon liquid rubber available at grainger.

the can they had was expired by a bit so they gave me 13 dollars off. THIS MOUNT COST ME $28!

since i had done it once i knew what to do and not to do, i used vaseline as a release agent and it worked perfectly, i upped the diameter of the exhaust pipe to 3" and this time cut the length to 3.5" even.
this i figure is good for some more stability and uses more of the urethane i bought anyways.

the vaseline had the mount slip right out of the pipe and has a nice sexy shiny look to it

i also revised my bolts, the go down about twice as far into the urethane, and the washer is completely welded, not just spotted to the bolt head.

i dont expect my original urethane one to have had any problems, but i needed one for the other side of the car, and im pretty sure this one is a bad mofo in comparison.

i would totally sell these if they were not so frighteningly easy to make. if you MUST have a set ill do them at cost plus tip ;) and shipping cuz honestly i think they are fun to do. I encourage you all to give it a shot! only thing you can do is make a motor mount and well possibly a bit of a mess if your not careful!

but i bet someone will pick up on this and put them to market ;) ;)

new one next to my original mount some may recall


all the pictures of my engineering done to the car is here

oh one last thing.. i was thinking of bringing materials to V-day and making a set on site.. that sound interesting? maybe ill bring some nivomat relocators and cradle crushers along for the ride as well

06-18-09, 09:56 PM
but i bet someone will pick up on this and put them to market ;) ;)

You mean like the other style mounts and spacers you made?

The new mounts look great! I was wondering where you bought the urethane from. Good info!

06-22-09, 07:43 PM
public advisory

sink the bolts in further than in the first picture set......
.... mount #3 under production now

06-22-09, 07:58 PM
lol did you do that on your 12.91 pass?

06-22-09, 11:21 PM
think it happend previous.. also the totally trashed stock mount opposite side wasnt pulling its weight..literally

07-02-09, 05:41 PM
my mounts made it through 4 dragstrip passes and v day 3 unscathed! they are still in perfect shape

80 bux and some enginuity gets you two nice motor mounts and you fan reinforce the factory trans mount.