The Doc
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| posted on 28/7/07 at 11:51 AM |
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Design Weights?
Q15 on the form is confusing. It says in bold letters:
'Only answer this question if you have a goods vehicle' Then it goes on to say: 'We need the design weights for all goods vehicles
and also vehicles in classes A, C, S and L.
I believe we are class A, so presumably they want this filling in?
If so what should I enter for that which is pretty much a 'book' car?
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nitram38
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| posted on 28/7/07 at 12:13 PM |
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Design weights are for brake calculation purposes.
You have to take a rough guess of a fully loaded car including driver/passenger, tools and full fluid levels.
Someone will be along to tell you what they put on their forms, but I think that it will be around 400Kg on axle one and 400kg on axle two.
The sva will weigh your front and rear axle to check if the brake effiecency is ok.
It is best to say that the design weight is a lot heavier than the car but not too high or you will fail on brake effieciency.
I have heard that it is an instant fail if you put too low a design weight than actual weight, but my design weight for the engine end of my car was
slightly under and the inspector adjusted it as it said that it was close enough.
[Edited on 28/7/2007 by nitram38]
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worX
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| posted on 28/7/07 at 12:16 PM |
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As above, but I was told 450kg & 450kg for the axles. Should be the same for you!
hth
Steve
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The Doc
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| posted on 28/7/07 at 12:32 PM |
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I suspect my car will be on the heavy side as I have Steel Prop shaft tunnel, 'behind seat' panel scuttle and floor panel.
Do you think the 450Kg figure will allow enough margin for this?
Also - Are we 100% certain that the two axle weights are all we need - no gross weight?
TA
Mike
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Bob C
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| posted on 28/7/07 at 12:50 PM |
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My understanding was that the design weight was to ensure the running gear was beefy enough. With running gear from a double weight tintop, it always
is; so a generally high figure is used (I said 400+400kg). If your car is actually heavier than the "design weight" - then you're
looking at a fail....
The brake testing machine at the SVA centre weighs your car and those are the weights used in their calculation.
I think everybody worries about what should be written in that box - but it's a non- issue!
Bob
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worX
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| posted on 28/7/07 at 12:52 PM |
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even an overweight "seven" won't be anywhere near 900kilos...
Just put 450 & 450 with a combined weight of 900kilos and you will be fine!
Steve
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nitram38
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| posted on 28/7/07 at 01:10 PM |
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quote:
Originally posted by Bob C
My understanding was that the design weight was to ensure the running gear was beefy enough. With running gear from a double weight tintop, it always
is; so a generally high figure is used (I said 400+400kg). If your car is actually heavier than the "design weight" - then you're
looking at a fail....
The brake testing machine at the SVA centre weighs your car and those are the weights used in their calculation.
I think everybody worries about what should be written in that box - but it's a non- issue!
Bob
They have no way other than a visual check to see if your running gear is "beefy" enough.
Axle design weights are for calculating brake efficiency i.e that the car is able to stop and that the brakes are up to the job.
[Edited on 28/7/2007 by nitram38]
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The Doc
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| posted on 28/7/07 at 01:28 PM |
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So that's 450 for axles 1 and 2 and
gross weight 900?
Is the gross weight the sum of the two axle weights or would it be rather less?
I dont really care as long as it fits the bill!
The braking system is as a MK 3 Cortina so surely it must be plenty good enough for a Seven
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wicket
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| posted on 28/7/07 at 04:22 PM |
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On the form we put design weights as 450kg front and rear, gross weight 900kg.
At SVA actual weights with all fluids but without driver was 308kg front and 304kg rear.
No problems at all.
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