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200 Series General Forum for the Volvo 240 and 260 cars |
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New (to me) 1980 Volvo 244Views : 2027935 Replies : 4092Users Viewing This Thread : |
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Mar 26th, 2020, 17:20 | #521 |
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Torque has the dimension of force X distance, and is expressed (in imperial) as ft.lb. Thus 5 ft.lb equals for example 5 lb pulling on a spanner one foot long.
Or it could be 10 lb on a 6" spanner or 2 1/2 lb on a 2 ft spanner. You could actually hook a spring balance onto a ring spanner and pull to the required force. Lb/ft would have the wrong dimension and be meaningless in this context. |
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Mar 26th, 2020, 18:25 | #522 | |
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I’m really pleased with myself for ticking off this little job, the easy way out would have been to just remove the two wiper/washers completely, but I’m pleased I bothered to get them working again - the Royal Barge is that little bit closer to the way it came from Gothenburg. I’m fortunate in having plenty of time to sort out these little issues on the Royal Barge, if I was paying for someone to do a proper restoration sorting out this little problem might have cost £300 in time and new parts. Alan |
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Mar 26th, 2020, 18:33 | #523 | |
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Mar 26th, 2020, 20:44 | #524 |
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As the function of lb/ft and ft/lb is mathematically communicative, it doesn't actually matter. English convention states lb/ft, US convention states ft/lb as a 5 ft lever with a 1lb weight on it would have the same torque as a 5lb weight on a 1ft lever.
It's simply how the units are expressed according to the convention of the originating country. The only confusing one is Nm in foregin countries. If it was kg/m then at least it would have some sort of simlarity to the rest of the planet!
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Mar 27th, 2020, 08:34 | #525 | |
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But it's not "pounds per foot" as expressed by lb/ft, but "pounds X feet" as expressed by lb.ft or ft.lb. As I said, they are different dimensions. One's division, the other's multiplication. The order doesn't matter in multiplication, x.y = y.x, but x/y is most definitely not equal to y/x. |
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Mar 27th, 2020, 09:20 | #526 | |
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On a maths paper, 3.3.3 = 27 whereas 3/3/3 = 1/3 (0.33333) but regarding torque, many people would use lb/ft in exctly the same way as lb.ft. One of those anomalies i doubt we'll ever get to the bottom of and as we all know what is meant, not worth arguing over.
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Mar 27th, 2020, 09:59 | #527 | |
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It is never right to use the divide operator '/' - because that would mean 'force per unit distance' (like Km/h is kilometers per hour), which is not what is being expressed at all. One will never find torque quoted in lbf/in, lbf/ft, N/m in authoritative texts - but always as lbf.in, lbf.ft, N.m and so on. I absolutely agree that this is not worth arguing over - but Clifford is still right :-) Best wishes, Alan |
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Mar 27th, 2020, 10:10 | #528 | |
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Mar 27th, 2020, 11:33 | #529 | |
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I'm pleased to say the oil leak is sorted. I took the Royal Barge out for some food shopping yesterday, and drove far enough to get it up to temperature. Last night I put a drip tray with a piece of clean card inside under the car and this morning - it was clean. I'm really pleased with that outcome - oil leaks are not really acceptable these days - and it must have irritated the PO. best wishes, Alan |
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Mar 27th, 2020, 11:53 | #530 |
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Great news on the oil leak Alan!
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