MOSTLY SUSPENSIONS
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Instant center location with adjustable 4link

Page 13
INSTANT CENTER LOCATION
4LINKS AND 4BARS

The following spreadsheet provides the instant center location for an adjustable 4link or for a 4bar. The horizontal and vertical dimensions are related to the rear tire patch. In other words, vertical distances are measured from the shop floor and horizontal distances are measured from the rear axle centerline.

Only the first (top) spreadsheet is to be used with a 4bar. Ignore the remaining spreadsheets.

For a 4bar, it is necessary that you properly input the vertical distances to the front pivots. The difference between the upper front pivot height and the lower front pivot height must be EXACTLY the same as the difference between the upper rear pivot height and the lower rear pivot height. Also the upper and lower bar links must be identical. If you have input the proper values, you will see "infinity" in the answer boxes for horizontal and vertical distances to the instant center. For a 4bar, the only significant answer is the percent antisquat, which appears in the remaining answer box.

center of gravity height =

wheelbase =

Upper Link Location and Length:

horiz. dist. to rear pivot =

vert. dist. to rear pivot =

vert. dist. to front pivot =

top bar length (pivot to pivot) =

Bottom Link Location and Length:

horiz. dist. to rear pivot =

vert. dist. to rear pivot =

vert. dist. to front pivot =

bottom bar length (pivot to pivot) =

INSTANT CENTER LOCATION:

horiz. dist. from rear axle centerline:

vert. dist. from track surface:

percent anti-squat:

LOCATING UPPER LINK FOR SPECIFIED PERCENT ANTI-SQUAT

Since the percent anti-squat is more significant than the actual location of the instant center (see Page 12), the following spreadsheet determines the upper link location for a specified percent anti-squat when the lower link location is predetermined.

The horizontal and vertical dimensions are related to the rear tire patch.

center of gravity height =

wheelbase =

percent anti-squat =

Upper Link:

horiz. dist. to rear pivot =

vert. dist. to rear pivot =

top bar length (pivot to pivot) =

Bottom Link:

horiz. dist. to rear pivot =

vert. dist. to rear pivot =

vert. dist. to front pivot =

bottom bar length (pivot to pivot) =

UPPER LINK LOCATION:

vert. dist. from track surface to front pivot:

LOCATING LOWER LINK FOR SPECIFIED PERCENT ANTI-SQUAT

Since the percent anti-squat is more significant than the actual location of the instant center (see Page 28), the following spreadsheet determines the lower link location for a specified percent anti-squat when the upper link location is predetermined.

The horizontal and vertical dimensions are related to the rear tire patch.

center of gravity height =

wheelbase =

percent anti-squat =

Upper Link:

horiz. dist. to rear pivot =

vert. dist. to rear pivot =

vert. dist. to front pivot =

top bar length (pivot to pivot) =

Bottom Link:

horiz. dist. to rear pivot =

vert. dist. to rear pivot =

bottom bar length (pivot to pivot) =

LOWER LINK LOCATION:

vert. dist. from track surface to front pivot:

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