Spring rates or specs

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Originally Posted by isuzurover

I have king springs in mine. KRRR-02 in the front - which I am happy with, and they seem fine with the extra weight of a bullbar and winch. I will measure the wire thickness and number of coils when I get home.

We should compile a database of spring specs for isuzu 110s.

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Agree. Found a spring rate calculator on the net. Will have a go at calculating tonight.

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Originally Posted by rar110

Agree. Found a spring rate calculator on the net. Will have a go at calculating tonight.

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Just be very accurate with your wire measurement and reduce the number of active coils by the right amount due to the closed and ground ends (can't recall how many ATM)

and, even though most of you would know of JB's spring page, it doesn't hurt to post the link again. http://members.shaw.ca/jbarge/springinfo.html

I haven't plugged the no's into the net calculator yet. However, the 130 front springs I have are the same as oem isuzu 110 front springs. The ome springs wire is 0.5mm wider wire and has one extra coil. The dobinson springs appear to 0.75 mm wider that oem and has one extra coil.
So the answer seems to be 130 springs are the same and probably 130 HD springs are ok with winch.

I should clarify I have oem perentie, ome 110 isuzu and 130 springs to compare.

OK, dug my notes out and you reduce the number of coils by 1.75 when calculating for closed and ground ends.

The formula I've used is

K=Gd4/64R3N

The 4 after the d and 3 after the R are to the power of

where
K= spring rate in lb/in
G= modulous of rigidity (1500000 works well in my calcs)
d= wire diameter in inches
R= mean radius of coil
N= number of active coils

For closed and ground ends, reduce coil wind number by 1.75 to get the number of active coils.
plain ends you reduce by 0.5
plain ends ground reduce by 1.0

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Originally Posted by rick130

OK, dug my notes out and you reduce the number of coils by 1.75 when calculating for closed and ground ends.

The formula I've used is

K=Gd4/64R3N

The 4 after the d and 3 after the R are to the power of

where
K= spring rate in lb/in
G= modulous of rigidity (1500000 works well in my calcs)
d= wire diameter in inches
R= mean radius of coil
N= number of active coils

For closed and ground ends, reduce coil wind number by 1.75 to get the number of active coils.
plain ends you reduce by 0.5
plain ends ground reduce by 1.0

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OK - you mean subract from the coil count. All landie springs should have "closed and ground" ends at both sides.

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Originally Posted by isuzurover

OK - you mean subract from the coil count. All landie springs should have "closed and ground" ends at both sides.

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reduce, subtract, same same :p

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Originally Posted by rick130

reduce, subtract, same same :p

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Not really (in a mathematical sense).

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Reduce:
7. Mathematics To simplify the form of (an expression, such as a fraction) without changing the value.

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Quote:

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Originally Posted by isuzurover

Not really (in a mathematical sense).

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Ok, subtract it is :D

http://i124.photobucket.com/albums/p...ne_2010007.jpg

KRRS-02 Front on Left
KRRS-04 Rear on Right

Both have 17 mm diam wire.

Fronts are 150 mm and rear 165 mm OD.

Guess mine will soon work on LBS per cubic ft:D

Pressure = Force / Area.?


Be interesting to calculate it out.
Air pressure in a given area = X force to hold the vehicle at a given ride height. There for I should be able to calculate the weight of a given load by using the air pressure.