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Old July 23rd, 2018, 07:26 AM   #361
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They can be fancier than angle iron, but the concept is the same. Take the load off the bolts so that the bolts are doing the retaining, not supporting the entire load.
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Old July 23rd, 2018, 09:54 AM   #362
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While I agree with you guys on taking the load off the bolts, 8 1/2" gr 8 bolts won't even bat an eyelash at that job. Besides, under power 1 side will be pushing down and 1 will be pulling up. If you don't want any shear loads on the bolts you'd want U shaped brackets wrapping around the top and bottom of the frame, which would probably suck to remove. The clamp load alone from that many bolts squeezing the brackets to the frame will probably keep them out of much shear force.
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Old July 23rd, 2018, 10:00 AM   #363
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I had thought about wrapping it around but thought it added complexity without a lot of extra benefit. You really think it'd be a benefit over the one 1/2" grade 8 bolt going through the bushing?

I guess if they get loose, they would be at a bigger risk.
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Old July 23rd, 2018, 10:15 AM   #364
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A little lip on one side would help with alignment on reinstallation.
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Old July 23rd, 2018, 10:16 AM   #365
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I would weld a “heel” ledge along the bottom to maintain location when they get removed and will also keep it from falling out if your bolts came loose.
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Old July 23rd, 2018, 10:17 AM   #366
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Fawkin Dale beat me to it by a minute.
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Old July 23rd, 2018, 10:21 AM   #367
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I wasn't as concerned with torque as much as keeping the engine from continuing to the ground when you land from those sweet jumps. At least with a lip on it, it can't fall to the ground. You could accomplish the same thing by making your thru-frame bushings stick out the thickness of the bracket material. Then the bushing would take the load and the bolts would hold them to the frame. I'm sure I'm over-complicating it. It's a little compromise for piece of mind IMO.
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Old July 23rd, 2018, 11:27 AM   #368
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FYI, @JohnnyJ your used tires have arrived. They look pretty good for their age but you will need to vulcanize one of them.
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Old July 23rd, 2018, 02:18 PM   #369
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It takes almost 18,000 lbf to shear a 1/2" bolt, so x8 thats 144,000 lbf. I don't know how much air time it would take to generate that much force, but I think its negligible since you'd likely be the weak link and not the bolts.

And since I love to get enginerdy with this stuff, the clamp load of a properly torqued grade 8 1/2" bolt is roughly 12,000 lbf, so x8 thats 96,000 lbf. So I'd dare say those bolts will never experience any shear stress of significant levels. :deuces:

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Old July 23rd, 2018, 02:27 PM   #370
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What bbaxj said but with math and numbers and stuff
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Old July 23rd, 2018, 02:39 PM   #371
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Whoa, that was a shit ton of tech there. Had to make sure I was in the right place.
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Old July 23rd, 2018, 02:52 PM   #372
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Old July 23rd, 2018, 03:14 PM   #373
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Dowels are for location, keyways are for stress, bolts are for holding shit together. You didn't even consider the moment arm to the CG of the engine from the mount point, or the fact that they'll pull threads before they shear. 4 of the 8 bolts do nothing with a down force, geez man, where'd you get that degree? Your calculations aren't even valid. Draw a free body diagram before you try to get all enginerdy next time.(Patiently awaiting FEA stress diagram ) I don't care either way. I can't even spell wheelering. It'll be fine until it isn't.
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Old July 23rd, 2018, 08:29 PM   #374
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Dowels are for location, keyways are for stress, bolts are for holding shit together. You didn't even consider the moment arm to the CG of the engine from the mount point, or the fact that they'll pull threads before they shear. 4 of the 8 bolts do nothing with a down force, geez man, where'd you get that degree? Your calculations aren't even valid. Draw a free body diagram before you try to get all enginerdy next time.(Patiently awaiting FEA stress diagram ) I don't care either way. I can't even spell wheelering. It'll be fine until it isn't.

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Old July 24th, 2018, 06:59 AM   #375
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Quote:
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Dowels are for location, keyways are for stress, bolts are for holding shit together. You didn't even consider the moment arm to the CG of the engine from the mount point, or the fact that they'll pull threads before they shear. 4 of the 8 bolts do nothing with a down force, geez man, where'd you get that degree? Your calculations aren't even valid. Draw a free body diagram before you try to get all enginerdy next time.(Patiently awaiting FEA stress diagram ) I don't care either way. I can't even spell wheelering. It'll be fine until it isn't.
So the engine is going to buckle allowing a moment to occur.
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Old July 24th, 2018, 08:38 AM   #376
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I like the dowel and tapered slot idea.
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Old July 24th, 2018, 09:01 AM   #377
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Use (16) 7/8" grade 12 bolts. Sleeve the frame. Slot it, dowell it. And then, booger weld the shit out of it.......
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Old July 24th, 2018, 10:08 AM   #378
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These things are taking up space in our warehouse. Thinking of taking bids.




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Old July 24th, 2018, 10:41 AM   #379
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These things are taking up space in our warehouse. Thinking of taking bids.




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How many free vulcanizing repairs are included???
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Old July 24th, 2018, 10:50 AM   #380
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How many free vulcanizing repairs are included???
If you want tires that have been vulcanized, I'll sell you mine.

And fwiw, I tend to need to repair about 1 of my reds per year. I can live with that.
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