Since my car came with cheby mounts on the frame I decided that I would try building some custom motor mounts.
When I had the car running before I just used a bolt through these with the engine mounts below, making it basically a solid mount.
So I gathered up these parts and put my brain in gear.
...and came up with this.
Unfortunately, I didn't account for the change in geometry when I lowered the installed height of the mount and had to start over.
Round Two:
Armed with my slide rule and high school geometry book, I went back to the chalkboard and re-designed the mount. This time I decided to just use bar stock instead of the 2x3 tube since drilling the notches in the tube was a royal pain.
I skipped some of the pre-assembly photos, but here is what it looks like welded together.
I learned another lesson from my first mount and this time I took my time with the welds and clamped another plate to the mount to help keep warpage down.
Once all the welds had cooled and I was happy with the way the mounts fit the car, it was time for the polyurethane. A little duct tape on the bottom to help seal the end and a couple of fender washers to hold everything together.
The top side got a piece of bar stock with a hole in it to help center the center tube and everything got bolted together.
I put the mounts in sand to get everything level and to contain any leaks or spills then it was time to pour and let sit overnight.
The next day the polyurethane is cured enough to handle, but wont be fully cured for a week or two.
The bottom has a nice duct tape pattern in the poly.
The top pieces had to be assisted off.
The finished product turned out pretty good.
And bolted in without those pesky geometry issues.
I think that I'll add a little brace under here so there isn't too much flexing though...
Oil pan to frame clearance was a little tighter than I had planned on, about 3/8" with a stock pan, but I think it will be alright as long as the polyurethane holds up. If it needs raised up any, a shim should be an easy fix.
This ended up being about 5/8" lower than the Chevy mounts.
