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Topic: weighing a car at home (Read 729 times)
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Capt Jack
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Ive heard about ways to weigh a car using some fairly common bathroom type scales. has anyone done this?
I want to start looking at some of the weight distribution for the duster and see what I can improve by shifting the weight thats already there. first step in that is knowing how much weight is on each corner I think...
so....anyone done this? how accurate is it overall?
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Bill_Reilly
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I don't think it's possible without using planks and figuring out the leverage. Typically, you'll see 800-900lbs per wheel in the front of an Abody, and 600-700lbs per wheel in the rear - far more than any bathroom scale would read. Unless you put boards under it and had the scale 10 feet away from the wheel, then multiply by the number of feet - which would be a royal pain, and probably not too accurate unless you measured exactly and had perfect scales - errors would also be multiplied, so you could end up being 50lbs or more off per wheel, making the whole process useless.
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Those who say it can't be done, should not interrupt those of us who are doing it.
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Capt Jack
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yeah, I was afraid of that. didnt think it could possibly be all that accurate.
thanks Bill. I'll have to think of something else
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Jim_Lusk
Official BS King
Global Moderator
BBD God
 Offline
Posts: 4750
A-bodies since 1978, this one since 1983
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Somewhere in the garage I have a device that my dad picked up may years ago. It's a diaphraghm device that you fill with air and hang a pressure guage off of. Each tire would go on the device one at a atime for the weight. I don't even know if it would still hold air.
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7903 posts on old board.
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Cpt Panzer
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would you not also need the car to be level ( if you jack up one corner and set it back down at a higher level like on a scale ) won't that ad more spring preasure and throw the actual weight off for your calculation?? I really dont know , just a thought. maybe you can make friends with a DOT officer who has a set of portable scales in his vehicle . they usually have at least 4 ,and they are usually pretty eager to get them out to show truck drivers how well they work.   |
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MAN,I WISH I COULD FIND THE TIME TO WORK ON MY PROJECT 440 in a 71 Valiant.
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Ciscodog
Guest
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You could use scales from "The biggest Loser" - those would probably work.
I use a cherry picker and a really big fishing scale.
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Bill_Reilly
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where you located? i have scales.
I was going to offer that too, but he's in california. |
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Those who say it can't be done, should not interrupt those of us who are doing it.
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bigtimeauto
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where you located? i have scales.
I was going to offer that too, but he's in california. Well if he want to bring it out he's more than welcome to!  bill did you get my PM the other day? |
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Bill_Reilly
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oops...yea I forgot all about that.
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Those who say it can't be done, should not interrupt those of us who are doing it.
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bOb shingler
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drive-on scales are at your local garbage dump, the cement factory and some dragstrips. |
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"bOb Built" (no matter how many times it takes) |
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moparrr07
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yes or i use my local grainery, its right next to the road, they always leave it on and accurate withing five pounds, go late at night and who would know
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'72 Duster: daily driver in 3 seasons, paid for, insured by and gased up, all by my 17 year old salary
225, 7 1/4, working on 451, and 8 3/4
brakes, 11 3/4
60-0: 105 ft.
cornering gs: estimate: .90
50% custom interior
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Cpt Panzer
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I've done that at the local stone yard. just jump out and peek thru the window. |
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MAN,I WISH I COULD FIND THE TIME TO WORK ON MY PROJECT 440 in a 71 Valiant.
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Gmax6
Full Member
Offline
Posts: 129
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We used the bathroom scales and it worked real well. I'll talk with my friend who did it and will fill you in later this week. Relatively easy, if you know the details.
Gary
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44073dust
Jr. Member
Offline
Posts: 23
^ SHAKE IT !!
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Capt Jack
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$549.00 !?!?!?!?!?!  uh....hmm, maybe the dump would work afterall
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44073dust
Jr. Member
Offline
Posts: 23
^ SHAKE IT !!
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$549.00 !?!?!?!?!?! uh....hmm, maybe the dump would work afterall Yeah, I didn't know how much your budget was, but thought I would give you the link anyway just in case. |
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bigtimeauto
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If you go on line there are diagrams of the ratio needed on how to do it with 4 bathroom scales.
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375InStroke
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So far I've found digital scales at $250 for 1000lb and $280 for 2000lb. I've seen load cells on eBay for cheap that you connect to a DMM to read the weight, but I can't find any now. Anyone have a solution under $100?
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boden
Newbie
Offline
Posts: 9
BigBlockDart.Com
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It can be done with as few as three bathroom scales with a board across them. If each scale has a 300 lb capacity you can weigh up to 900 lbs by just adding the readings on each scale together. For best accuracy it is important to elevate the other three corners the same amount as the one you are weighing and to make the measurements on as level of a surface as posible. An easy way to think of it is to stand with your weight split between two scales. No matter how you stand the total of the two scales should equal your total weight, shifting your center of gravity relative to the scales just changes how the weight is distributed.
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