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Author Topic:   Front bumper material
Dirt Maniac

Total posts: 199
posted June 09, 2004 10:51 AM  
Just wanted to ask what most use for tubing thickness for front bumper. I have been using 083 but bends up easily. This is fine because it may save the front end. I know some are using 090 or 095 material. Please let me know, I'm thinking of going heavier but not sure.

Dirt Maniac

Total posts: 192
posted June 09, 2004 12:05 PM  
I got a bumper off an asphalt car once that was made from .083 chrome moly. Boy was it light, but bent at the first little contact. I like to make mine with a .083 top bar, and .095 bottom

Dirt Forum Champ
Total posts: 1172
posted June 09, 2004 12:08 PM  
you need a crush zone and the front and rear bumper is one of them , helps save major frame damage from those bumps you get. I use 1 1/2 .083 mild steel.

Dirt Forum Champ
Total posts: 755
posted June 09, 2004 02:12 PM  
1.5" od, .083 wt mild steel is on my car. holds up good, but will fold up also so you don't bend your frame. I don't think I'd use anything else. If you get tired of replacing bent bumpers, we use a porta-power and straighten them back out in about 15 minutes while they are still on the car.

Dirt Maniac

Total posts: 199
posted June 10, 2004 08:51 AM  
Thanks guys I'll stick with the 0.83 and 11/2" bar.

Dirt Maniac

Total posts: 168
posted June 10, 2004 09:46 PM  
Heres an idea I think that might fit here how about how you guys mount the front bumper I have seen it done with the bumper welded to something like 1 1\4 light gage square tubing that sets down into bigger heavier square tube pockets welded vertical on the front frame horns then when the bumper takes a hit it will fold the lighter gage tubes the bumper is welded to then for repair all you have to do is unbolt the bumper slide it out of the pockets welded on the frame and replace only the short vertical tubes saving from starting all over with a new bumper. The other deal I would think would work is when your bumper is bolted into the sides of the front frame horns is use one 1\2 grade 5 bolt and maybe one 5\16 non grade bolt then when it gets hit it would shear the smaller bolt and pivit on the bigger bolt long as the bumper is mounted so it would not fold down and drag real hard on the ground to repair just pivit it back up or down depending on witch way it goes then replace the smaller bolts again saving the cost of completely replacing the bumper. These are just some ideas our bumper is just as it came from the chassis builder light wieght bumper tubing I think 1 1\2 tubes .085 tubing mounted with two 1\2 bolts trashes the complete bumper when ever it takes a good shot. better Idea if your selling bumpers lol

Dirt Freak

Total posts: 324
posted June 11, 2004 07:51 PM  


Dirt Full Roller

Total posts: 32
posted June 12, 2004 06:37 AM  
exhaust tubing is mostly .75, ive used it for crumple zone bars on our fig8 car. seems to work pretty well, but its not much cheaper than roll cage tubing. ive used 2 1/2 exhaust tubing to make drive shafts without a problem also

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