OME 851, 850 & 850J what is the difference?

[IronCladLou]

Great thank you. @red mud fj

That's one of the three Q's answered.

Looks like from that chart that I never have seen, great info.

# of wraps:
851 = 8.18 wraps
850 = 9 wraps
850J = 9.9 wraps

OK, so would more wraps constitute a stronger spring?

More "wraps" would be a softer spring. Spring rate is a function of the diameter of the coil, the number of active coils (i.e. coils not in a bind), the wire diameter and the Modulus of Rigidity of the material. We can assume that the Modulus of Rigidity is the same for all coil springs.

So...a spring with the same wire diameter and same coil diameter, but simply longer (like a J spring, I would imagine) is going to have a lower spring rate. It will yield a higher ride height based purely on the fact that it is a longer spring.

 

[GW Nugget]

My info that I have been referencing from is WRONG. Sorry for the confusion, I hope I will be able to correct this. Let me explain...

The wire diameter does get thicker as OME adds wraps or turns which total makes sence now. As you add thickness & turns the rate stays the same.

I got my info from @Romer in a 2006 post who referenced it I belive from Cruiser Outfitters. OME Lifts discussion for the FAQ Their chart below reads as all 3 springs at 17mm/.669" this is incorrect.
After looking directly from the current OME pdf it corrects all the confusion that I have had. Here is the correct onfo.The wrong info was saying all three springs where the same wire dia. of .669"/17mm but in reality they are all different. If I knew metric I would have seen this sooner.

The correct chart read as:
851 16mm/.629" 8.18 turns
850 16.5mm/.649" 9 turns
850J 17mm/.669" 9.9 turns

This all makes sence now the diameter gets thicker as they add turns to achieve the same rate.

Sorry for the confusion, what a ride this has been. Hope this helps. Below is how I found the pdf, if I figure how to get the link I will post it.
http://www.sleeoffroad.com/installation/ome_spring_specs.pdf

 

[sleeoffroad]

The OME L shocks don't make sence thread.
I run mediums with Ls which they say don't work.

At full droop on a lift does your medium springs become unseated? I would think they do.

Also, we started calling the lift a 2.5" lift, based on measurement we got. OME calls it a 50mm lift.

 

[GW Nugget]

At full droop on a lift does your medium springs become unseated? I would think they do.

Front no, rear yes just loose, no where near ready to fall out. I have a front 25mm spacer which makes the free height of the 851 at approx. 20" like a 850. I have found this to work for my 97 LX450. The 860 & 863 has a free height of 18.9"/19.23". People like @Tools R Us have been using L shocks with the 850J/863 combos for years.

Thank you for your time today Christo. Those 60071Ls that I purchased from you work perfect, firm & stable. Yes they are on 860s with a 1.25" frame bump stop extension.

 

[LFD2037]

Front no, rear yes just loose, no where near ready to fall out. I have a front 25mm spacer which makes the free height of the 851 at 20" like a 850.

In one of my ramblings I quoted an ad from an Australian OME sales thing. It recommended 60018 for front and 60020L for rears for 850/860 combo. Having just read what you posted, it makes sense. The front doesn't have near the flex the rear does, hence no need for the longer L shock in the front! Clear as mud?

 

[GW Nugget]

Here is my not recommended set up with a 860 that's a 18.89"/19.23" free height in rear. 60071L with a 1.25" bump extension. I have 1" of up travel left in the shock & my 315 is just a finger away from the top of wheel well with a 1" body lift.
I think I just derailed my own thread...

 

[richardlillard1]

Dat rear upper bushing...

 

[GW Nugget]

Also, we started calling the lift a 2.5" lift, based on measurement we got. OME calls it a 50mm lift.

Christo, how does Slee Offroad measure lift?
Hub to fender?
Bumps to stops?
Bottom of rim to fender?
As per factory FSM specs?

Note FSM measures from front inner spring bumps to stops & in the rear from the frame bumps to axle.
Where do you measure?

 

[LFD2037]

The a) measurement on that pic is off from what I found but not too far off.

 

[sleeoffroad]

Christo, how does Slee Offroad measure lift?
Hub to fender?
Bumps to stops?
Bottom of rim to fender?

We measure center of the hub to fender lip straight up. That is how we do all pre and post measurements when we install suspensions. In most cases we are just interested in total gained height