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Old 03-19-2003, 04:02 PM
Gearhead forever's Avatar
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Red face Oh No... what have I done???

I recently took alot of time to box the frame rails on my pick up truck. Since I've done that some people tell me I should have never done that because the frame will break apart or twist if I put alot of horsepower in it. Every time I pick up street rodder and such, the articles always show what I have done. It seems all the big builders do the same. What gives? Is there any truth to this? I still have time to undo it since the frame is unassembled. Help!!!

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Old 03-19-2003, 04:06 PM
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I think you boxing your frame would a good thing, it should add a lot of strength to the frame. Their plenty of cars with boxed frames that have over a 1000hp.
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Old 03-19-2003, 04:21 PM
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Thats exactly what I think. Why would all the big shops do the same thing? I think these guys are on crack. Before I started I could lift one corner of the frame and it would twist just like that. Now I lift one corner and it lifts up the whole back end. One guy says that its better if it twists freely, but I can't see how I could plant any power to the ground this way. Its bad enough that its light in the rear already.
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Old 03-19-2003, 05:38 PM
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you did the right thing gearhead. every rod i have built is done this way, and have never had a problem. my coupe has seen a lot of drag racing, and has never broke. good luck on your project.
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Old 03-19-2003, 05:46 PM
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Nice to hear some first hand experience. Makes me feel better. Thanks.
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Old 03-19-2003, 06:08 PM
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yep your ok, these guys don't know a thing I'm 16 and know more, thats like saying subframe connecters are bad and will cause probloms and likely break off, I've never herd of this happening. Good luck with the rest of your project.
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Old 03-19-2003, 06:13 PM
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Subframe Connecters are bad... thats why I'm gunna put them on my car.

About the only disadvantage to stiffening up the frame is you add weight. Twisting is never good, especially in a high power vehical.
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Old 03-19-2003, 06:59 PM
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You know gearhead my Dad used to tell me you could not weld on frames or they would crack. I have since learned this is far from true for most stuff. I alway wondered where the misconception came from.

Chris
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Old 03-20-2003, 12:44 PM
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Not meaning to be crude, but opinions are like "belly buttons"- every body has one... [post on this site long enough and you'll find tons of opinions- some based in fact and some personal preferences that THEY think are Gospel...] In MY humble opinion you were totally correct in boxing- my Brother-in-Law is a professional/welder fabricator and his relative (who races EVERY weekend) takes every car to him for boxing. Good job.
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Old 03-20-2003, 03:47 PM
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Yeah-- Also notice how everyone is an authority and tells you how your going to mess up or you should have done. Usually means they don't the drive or knowledge themselves- you did the right thing as everyone on this forum knows.
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Old 03-20-2003, 03:57 PM
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From an engineer's perspective...

The welding is not done anywhere near the stress concentration points of the frame and therefore, any material property changes that result from the heat of welding will have insignificant effect on the strength of the frame. That's just the effect on the existing frame. Now, the fact that you are adding more support along the rails means you are increasing the moment of inertia resulting in a much stiffer frame. This means that even under excessive loading, the frame is less likely to twist or suffer fatigue failure over time. The only downside I see is the added weight.
Just my two cents....
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Old 03-20-2003, 04:28 PM
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Right on! Thank you my street rodding brothers...I don't mind the extra weight out back, I'm not tubbing the rear so traction will be limited. How can you twist the frame if you can't hook up anyway? I'm gonna tell this guy to go pound salt...
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Old 03-22-2003, 07:23 AM
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Full steam ahead then...I fabbed up the x-support for the tranny last night. Found out a few things the hard way, have some new mods to do, but I suppose thats how it goes. Looks like the headers may be a real tight fit with the boxing I've done. At least its starting to come together, and looks like something.
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Old 03-22-2003, 09:10 PM
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Many heavy duty trucks have a stamping on the side of the frame rails that states "DO NOT DRILL OR WELD". I've always wondered why that was on there, but nobody can give me an answer. I wonder if that is where they got their idea about not welding the frame. Who's the truckers here?
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Old 03-22-2003, 10:48 PM
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The only reason I could see for that stamping is if it was some special heat treated metal the heat from welding would cause it to actually be weakened. I dunno HK might know or one of the other experts.
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