Several years ago I reported on the Yahoo! Club how I made my own polyurethane motor mounts. To get this forum started I'll post the method here.
I burned the rubber out of a sagging set of V8 mounts.( I lived in a rural area at the time and tossed them on a burn pile). I built a triangle jig from 2x4s with two 45 degree corners and one 90 degree. I bolted the two halves of each mount to the 45 corners to suspend them in the stock position and used duct tape to dam up the backside.
The polyurethane I purchased online from Smooth On. It is a two part mix that was more than enough for 4 motor mounts which cost around $30. I mixed it up and poured it in the open end of the mounts.
OK, it didn't quite go according to plan. The mix is the consistancy of honey and the duct tape didn't seal as well as I thought it would. It started leaking out the bottom of one mount. I had on rubber gloves as instructed so I held the gap closed for about an hour until it setup enough to walk away.
The bottom piece of the stock mount is not a precisely manufactured part. They seem to vary from one to the other so alignment isn't so easy. Kinda eyeballed it. This first set I made ended up sitting lower than expected so I shimmed them. I haven't put many miles on them but they have been on the car for around 4 years and look the same as when I put them in. When I rev the 140hp motor I measure less than 1/4 " deflection at the air cleaner stud.
So, after I replaced my old mounts with the new I did the same thing with the second set. This time I moved them further out of the 45 degree corner to give them more height. I did a better job of taping but still had seepage. Haven't installed them in anything yet. I consider this a success and is cheaper than replacement mounts
sounds like a great idea
here in Aus i have a poly manufacturer 10 mins down the road
they are going to re do my engine mounts for me using the same method you have used
Roger , I want to try this on my S10 Mounts, ( they look like large bushings ) I checked the site www.smoothon.com .Which kind of urethane and hardness ( 10A- 50A ) did you use? Did you use a release agent? Doug in Az
My Old Monza now lives in Arizona with its newest owner.
The 90's just keep rollin' along........ 1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 118K miles 1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 157k miles
My Old Monza now lives in Arizona with its newest owner.
The 90's just keep rollin' along........ 1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 118K miles 1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 157k miles
Doug,
Sorry, havn't checked this forum lately. I used shore 80A. I think it was pmc-780 Dry. I wanted it as stiff as I could get and still absorb vibration, but I wasn't familiar enough with it. Check this page. Its kind of vague but it puts tire tread between 65-75. Skateboard wheel 85-95. But 10-50 is pretty soft.
You might be able to email Energy Suspension and ask the what hardness their mounts use. I didn't use a release agent. The only thing to release was the duct tape and it came off once it set up.
Doing the s10 mounts would be a little tricky setting up a jig to hold everything in place and then pour in the urethane.
My Old Monza now lives in Arizona with its newest owner.
The 90's just keep rollin' along........ 1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 118K miles 1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 157k miles
Those look fantastic,,,,, I been looking at this post for a long time,,,it seem's to get more people interesed in the process glad it has new picturer's with the finished product.Mike