Front shocks with a transverse spring?

[frank_a]

I have shock mounts on the front of my t tub from the headlight mounts (those right angle things on the front of the frame) to brackets on my radius rods. Just like I had on my old t bucket.

What I'm trying to figure out this time around is how I figure compressed length and extended length? I know the length at rest, as that is easy.

Any help greatly appreciated. Thanks!

[Bill Cleveland]

I'm not sure where I read it, but you should allow 2/3 of the travel for jounce (upward motion) and 1/3 for rebound (downward motion).

[frank_a]

Let me see if I got this straight Spanky. Center of hole to center of hole for my shocks is a tad over 12 inches, but with a bit of angle. So I want 20 inches of extension and 4 inches of compression?

Thanks man!

Frank

[Bill Cleveland]

I believe you are overthinking this, Frank. Either of these should work for your ride height . . .

https://www.speedwaymotors.com/Bilstein ... y=213-1354

https://www.speedwaymotors.com/Search?query=582-SM500

[frank_a]

My static height is actually (center to center) 12.5 inches, so I guess I'm looking at the $113 each Bilsteins if I want chrome. On the other hand, I am trying to stay away from chrome, so will do a bit more checking for something I could paint the color of the body (and fan shroud, air cleaner and headlights). Thanks Spanky. I will keep you posted pal.

Frank

[frank_a]

Something painted like this Spanky?

https://www.speedwaymotors.com/Speedway ... ,2183.html

[Bill Cleveland]

Yup. Those should work!

[Bruce Pickett]

2018 Product catalog
Motorsports off-road/Powersports Street Performance
hypercoils.com



page 37


Corner Weight
Use tire scales, as used by racing teams, or weight the vehicle
on axle scales used by trucking companies. Make sure to
weigh the vehicle in the configuration of its most frequent
use. Add weight to compensate for the driver, passengers,
and cargo in proper locations.
Unsprung Weight
Unsprung weight is the vehicle weight that is not supported
by the springs. Examples include: Tire/wheel assembly; brake
rotors and calipers (or drums and components); wheel
bearings; steering knuckle; hanging weight of the control arm
(or trailing arms on rear axles); differential and axle weight;
1/2 of the spring and shock absorber weights. Unsprung
corner weight is usually around 70-120 lbs.
Dimension A
Dimension A
- Measure the distance from the control arm
pivot point on the subframe (centerline of the bushing) to
the point on the control arm directly under the center of the
spring or coil-over assembly.
Dimension B
Dimension B
- Measure the distance from the control arm
pivot point on the subframe to the centerline of the ball joint.
Note: If you are running reverse offset wheels, then measure
to the center of the wheel.
Spring Angle
Using a protractor or similar measuring device, find the angle
of the centerline of the spring or coil-over assembly from
the horizontal of the control arm. In most cases, this will be
somewhere between 75 and 90 degrees, and 90 degrees can
be used for the angle. This measurement helps determine
the “force angle” and resultant spring force applied to the
control arm.
Shock Ride Height from extended Height
Determine the total travel of the shock absorber using the
shock manufacturer’s catalog; or by pulling the shock shaft
to the full extension position and measuring the length of
the chrome shaft. Generally, the shock should be compressed
40% - 50% of its travel at ride height. For example, if a shock
has 4.8” of travel and you want the sprung weight of the
vehicle to compress the shock 45% at ride height, you would
enter 2.16” (45% x 4.8”) of shock compression to ride height.
Sprung Weight
Sprung Weight = Corner Weight - Unsprung Weight.
It is
the weight of the vehicle that is supported by the spring and
is the only weight used when calculating spring rates.
Motion Ratio
Motion
ratio = (Dimension A / Dimension B) *sin (Spring
Angle).
The motion ratio is the mechanical advantage (lever
ratio) that the wheel has over the spring in compressing it.
Static load
Static Load = Sprung Weight / Motion
ratio.
The static load
is the load that the spring sees from the sprung weight acting
through the motion ratio.
Spring Rate
Spring
rate = Static Load / Shock
ride Height.
You
should always find the closest spring rate available for your
application. When in doubt, choose a lower spring rate. It
is easier to achieve handling and performance with a lower
spring rate and a “stiff” stabilizer bar or shock.
Wheel Rate
Effective Wheel
rate = Spring
rate* (Motion
ratio)
2
.
Wheel Rate is the effective spring rate at the wheel, due to
the leverage advantage the wheel has with respect to the
spring on the control arm.
REQUiRED MEASUREMEnTS
Corner Weight(lbs):
Unsprung Weight (lbs.):
Dimension A (in.):
Dimension B (in.):
Spring Angle (deg.):
Shock Ride Height from Extended Height (in.):
technical
inforMation
38
Visit
hypercoils.com/spring-
calculator
to use our
real-time calculator.
SuSPenSion SPring rate and Wheel rate c
alculator