CMC front bumper mount brackets

I had .5 degrees of caster. I put my caster shims in. Now my front bumper is rubbing the turn signals... Scratching my head. I looked closer and the dang brackets are welded to the front beam/tube. So the caster went up with the bumper. How stupid is that. I'll need to get out the zizz wheel and welder... But first, can I ask how you have the bumper mounted?

Check the build manual online in Library here. Sway bar modified Brackets below fit to beam with 3" U bolts (4 total, 2 each side). T brackets are bolted on to that. Your builder had a brazing mania! Hope you can get the spark plugs out.

Sheesh, he brazed the rod ends together. Well, maybe not... But still. At least I can easily oxy/ace the braze out easier than 3" grinder!!! I am trying to decipher your pics into what I need to fab...

wolfgang posted pictures of modified front bumper mounts. these are what he is referring to mounting on the beam with 4 exhaust clamps:

here is what your should look like:


wolfgang's bumper mounts are modified to allow the sway bar to be used without hitting the stock brackets.

Ok great guys! Thanks! I just need to round up the parts and start fabbing.

Count yourself lucky. My IM car has the beams welded to the frame of the car - no caster shim option, but it must have saved the price of the long bolts.

Ken, that really sucks... That's not simple there.... Please tell me that IM didn't do that....

How bad would this look? Muffler clamps (1 per tube) TIG a 1/4" strip of steel to the clamp, and where they meet up behind the bumper, tig them together. Basically creating an " A " then fab off the current bracket that is on the bumper. That's gotta look better than round welded and brazed rods.

Beck also welds the beam to the frame. The welding points are considerably further toward the outside of the car, making the torsional rigidity much better. It's also done that way at the rear. I would imagine that IM does it for the same reason. You lose castor adjustability, but you gain chassis rigidity. Pretty fair trade, I think.

I have an original set not on my CMC if you would like me to measure
the pieces, it might speed up your fabrication work. Just let me
know.

I put my caster shims in without thinking about it rotating the front of the bumper brackets upward.

I then attached the fiberglass pieces that come with a CMC and fiberglassed them to the underside of the body.

Now the tee that holds the bumper doesn't align real well with the bracket. It is closer to the bottom of bracket,touching the weld between the bracket plate and tube.

I wish I had thought to shim the top of the bracket where it touches the top beam tube.

I'm measuring it all up now, thanks!

Keith, it keeps me from fiddling with caster and shims but probably does more good than harm.

If IM was thorough in installing the beam by welding it's likely that they also considered caster when jigging it up, and what Lane said is true that the attachment is made at the outboard ends of the beam set, solidly attached and inflexible with the stock attaching points acting only as struts between the beams. Height is adjusted using weld-in adjusters on both beams.

Mine bolt up to my 1x4 frame stiffeners. the beam is sanwitched between