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Author Topic: Correct way to measure strut length
michondini
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Posts: 3
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Post Correct way to measure strut length
on: July 17, 2019, 06:14
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Hi Guys,

Taking measurements of my BMW E36 M3 front MacPherson strut suspension, and I am not sure where to take the lower measurement from on the knuckle to measure the strut length. The strut fastens to the knuckle via 2 different points in elevation.

Not knowing which point to take the measurement from is also preventing me from taking my kingpin spindle and hub offset measurements. Any help would be appreciated.

Thanks,

Michon

michondini
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Post Re: Correct way to measure strut length
on: July 17, 2019, 06:39
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Also, the strut is fixed rigidly to the knuckle and the only pivot point is at the bearing at the camber/caster plate at the top of the strut. When I am inputted my suspension dimensions. It shows the lower strut connection the the knuckle as though it were a bearing connection allowing rotation.

See attached pictures.
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racingaspi-
rations.co-
m
Moderator
Posts: 103
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Racing Aspirations
Post Re: Correct way to measure strut length
on: July 17, 2019, 08:49
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Hi Michon,

I would take it from the upper bolt as this looks more accesible. See the attached picture.

Regards,
Huw
Image

racingaspi-
rations.co-
m
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Posts: 103
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Racing Aspirations
Post Re: Correct way to measure strut length
on: July 17, 2019, 08:52
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The macpherson calc should be acting as you describe - a rigid connection between the strut and the upright. Can you you show me what you mean - maybe share the model.

michondini
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Posts: 3
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Post Re: Correct way to measure strut length
on: July 17, 2019, 14:39
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Thanks for the quick reply Huw. I think I fixed my problem by checking the box "Strut inline with kingping" indicating that a line would be drawn through the upper strut mount bearing, to the lower control arm bearing. Like the attached images (right side).

Let me know if i have the right idea.

Now i just need to figure out an accurate way to measure my kingpin offsets.
Image
Image

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