LOL .
Anyways I just looked at some of the spacers I made for our shocks.
I know I said earlier in this thread that I didn't completely like those spacers but it appears mine are the same LOL. I must have been thinking about the very first ones I made which were larger and the spring fit inside that spacer. My bad.
Based on what Terry is gona post here for results and based on adnoh's math I may buy two sets of these springs for my self but I am gona buy 145lb/in springs I think. Reason -- my brother and I are flea weights.

I never met a spring I couldn't mash. lol...

Why of course I can. Sounds fun for me.

chart

Thx adnoh.
I will get those motion ratios later tonight and post it here.

Your welcome, here is some read and pic

Fl 350 spring change:
Here is some information on changing the spring in the rear stock shock. Based from what Terry H posted the stock spring has a free length of 11-5/8 inch. He has used a new 10” spring with a solid spacer of 1-¾”. This brings the new install to 11-3/4 inch total free length. The stock spring according to Terry H has a 210 lbs/in rate. He also has provided measurements for an increase in pre load poundage in fraction of inch.
In order to make the math easy we will change the fraction to a decimal number which easier to work with. To do this is pretty straight forward. You divide the first number by the second:
3/ (divided by) 4 = .75. Now we can take the rate per inch of 210 X .75 (of an inch) = 157.50 lbs, to get poundage. The following information is based from this math. Now everyone can do the math easy.
Please keep in mind the numbers provided by Terry H to get the correct number for the installed spring. With the set up at 11-3/4” and the installed length of 11-1/4” there is a pre-load of ½”or .50 on the shock. Take whatever spring rate times .50 (185 X .50 = 92.5) and you get the poundage of static preload on the shock before installed. The weight/force applied to this shock now must overcome this poundage before the shock/rate becomes usable. At a 1 to 1 rate you have to take the rate plus static pre-load to start with. At zero preload the shock will move 1” for every 185 lbs applied+/- 1% (guaranteed rate by MFG). With pre-load of 92.5 you now have to have 185+ 92.5 = 277.5 lbs to move it the first inch. This not a big deal as long as you understand the impact.
An example of this is the balance or weight applied to the shock to get sag or ride height. As mentioned before this shock is not at a 1 to 1 so there is a lever ratio involved. This takes us to a wheel rate versus spring rate which we can deal with later. Let’s look at the book rated balance of 396 lbs. if we divide that by half 396/2=198 lbs. If we use a 1 to 1 (for now) we find that with a static preload of 92.5- 198=105.5. So how far will the shaft move at that weight or sag (ride height), we can find this pretty easy. We take 105.5/185=.57 of an inch. If the shaft is six inches long (Book says 5.9 round up to 6) the sag in a percentage would be 6 -.57=5.43/ (divided by) 6=.905, 1-.905=.095 or 9.5% not even 10%.
Most say, a good sag or ride height number is 30% so we need at least 20% more which is controlled by the balance and spring rate. In this example a red flag flashes don’t do it. The 10” spring on a 6” shaft the spring most likely will go solid or bind. I know there is a lever ratio and the shaft is not 6” so this is why the information is important. Back to the example! We need too determine the amount of shaft and spring rate including the static pre load to get 30% sag. 30% of 6” shaft would be 6 x .30 =1.8”Remember the 105.5lbs rear balance for that shock, 105.5 / 1.8= 58.61 rate. Long way from 185, now what, first let’s look at the rest of the shaft or 6-1.8=4.2 remaining shaft. If at the 185 pound rate this would provide a bottom out poundage of 185 x 4.2=777 lbs or 1554 for the rear if they bottom out tighter not likely, this is why we look at each wheel. If you’re following correctly you should be asking how we got to 30% if we used the 185 with the spacer!
The correct number using the above 185 with spacer and a static pre load of 92.5 would provide us with a left over shaft of 6-.57=5.43” x 185=1004.55 bottom out poundage ( BOP). This is where we can use the old spring and do the math to get an idea of what to do. Once we get that we can match up a dual rate spring set up to get both 30% and correct bottom out poundage with more control.
The old spring has a 210 rate with static preload of 78.75. Using the math above time for some fun, I will leave it up to the board to get the right answer for BOP using old spring and the above example. Then we will look a dual rate set up to do the job.
We can discuss the three options for a dual rate set up for dirt, sand and woods. Each has a different set up for god tire traction.
FYI: The Terry H spring has a Travel height of 5.64” and a block height (coil bind) of 4.36” as a safe rule use no more 70% for the spring height. See the red flag ½ static plus 6” shaft is 6.5”. The travel for that spring is 5.64. ooops. This means it will go solid at a shaft length of 5.14”. Travel Data from Eibach(see pic). Remember we know it’s not a 1 to 1 however the shaft travel better not be longer than 5.14. Oh ya 70% of the 10” spring travel height of 5.64 x .70=3.948-.5 static pre-load= shaft travel of 3.448”
As always someone check the math
Andoh

The spacer is actually 1 5/8" if that matters.

Sorry Terry but adnoh and I are going to hijack your post a little bit. I can get hoser to move it later if you want.
I feel this important to keep all of this stuff together in one post rather than spread it out and then no one can find it. The rear spring rate has been a big issue here for a really long time and no one has really addressed it until today. Now we will know what spring rate to run and where to buy springs.

Soooooooo --- lets begin ---- please give me several minutes to post all the pics before you comment.

I took a stock shock and marked it with a metal marker and then marked 1" spaces.
You will see that a stock shock has 3 3/4" total stroke if you remove the snubber. The stock snubber is actually 1 1/4" so if adnoh wants he can remove that from the calculations. The stock snubbers are as hard as the back of gods head so not sure how much dampening your gona get with it. I do not know what the durometer is on these.
Shock length is 15 1/4" extended.
Shock collapsed is 11 3/8" with NO snubber (max).
At this point I installed the shock and put a 2' carpenter square on the floor next to the axel.
I marked the zero point and then marked each 1" stroke of movement on that square.
Then posted the results of each 1" shock travel and wheel travel.
PLEASE NOTE THAT THE TOTAL WHEEL TRAVEL WITH NO SNUBBER IS ACTUALLY 5 5/8" NOT 5 1/8". I FD UP ON THE ADDING.
Pics below tell the story.

More pics

More

So there you go adnoh it's 5 5/8" max wheel travel with a 3 3/4" shock travel with NO snubber.

Edit: So the lever ratio is 1.5
That's 1.5" of wheel travel for 1" of shock travel.

adnoh I don't want to sound like an Ahole but now you have to do this all again .
Honda lied when they said the oddy has 5.9" of rear travel. This wouldn't be the first time a sales team fudged the numbers a bit would it ??
The actual rear wheel travel as shown above is actually 5.6" and that's WITHOUT a snubber. The sales team may have "over looked" that part as well.
Still the above info is good stuff --- I like it.
Looking foreword to the spread sheet you post with the adjusted numbers and the motion ratio.

Edit: Can you also do a sheet with the corrected motion ratio and a 15% sag ??
The reason I ask is because a 30% sag number takes away to much of the travel for an oddy.
The suspension is suspect at best and now we rob 30%
Now what do we do about the snubber ?? I actually cut some of my snubbers to get some extra travel.
Thx in advance for any info.

Edit again: Hey Terry if you want me to move this crap just PM me and I will contact hoser. I just want this stuff in one place. Still looking foreword to your final spring rate and ride report -- CO.

I'm good with all this info being right here.

And all these years I just got on and rode my machines, never knew it was even possible to have this much info about a shock.

I also take my guns to the range and enjoy shooting them, but have never analyzed the physics of the action or the elements of the powder.

Hey adnoh can you do a sheet that shows the spring rate needed for a small rider (130lbs) with 15% sag and another one for ------ say a fluffy fellow at 250lbs ??
Thx in advance.

Thinking slightly outside the box here ------ I think this info opens up the range of shocks we may be able to buy but it may also make it more complicated. If I ever get a chance I will have to investigate this. I also bet the front end travel is suspect as well but there is a lot more leeway because there is no u-joint bind issue. This will all be future projects for me.

This is my reloading room... But I know zero about shocks.

Ohhhhhhhhh my brother would be so jealous.
He is heavy into reloading right now. It's his new hobby.
I like guns a lot too. Build some suspect stuff .
Don't want to turn this site into a bang bang site so I don't post.
I like the multi compartment storage tray idea on the left of the bench. Smart.
Very nice room.

Nice setup. Close up of the comic on the wall please.

I would love to see what build CO. Perhaps a new thread.

I figured I'd share this also since I have it right by the comic. It's my letter to Santa when I was 7. Two things to note about this letter. I pretty much still want the same things 50 years later and NO ONE ever mailed my letter!! lol...



No intent of cluttering up the site with a bunch of gun stuff, but thought some of you might be interested in seeing the gun room video tour...

Just watched the video. Very nice room.
I see a couple of things.
1) That compressor in the metal cabinet and it's in your house, not a shop.
Those are noisy at the best of times. I would line the inside walls with foam board or insulation to kill the noise. Might keep the wife happier.
2) That tumbler.
Those things are noisy and irritating too. They run long time. I would make insulation lined box that fits over it to kill the noise. Think happy wife again here.
Just my opinions.

Actually the cabinet muffles the compressor pretty well. I usually keep the door closed. Not an issue at all. The tumbler I only run when we're not home. It is obnoxious. The wife has put up with much worse than this in our 35 years. lol... She's my hero.

No I can't do that.
This is an oddy site and I don't think hoser would like it either, so we gota keep it oddy related.
The occasional pic of another hobby seems ok to me but turning it into a weapons factory would be bad.
I did make a small barrel out of some mild steel cold rolled and rifled it using Clint Westwoods design but I figured out a way easier way.
Can't share that though .

Man adnoh has been signed on for a while now so I bet he has a complete novel going right now LOL.
Looking foreword to that posting when it comes.

Wish hoser was here to answer that. General BS section has always been open to anything, but I understand what you are saying.