Rear Spring Rates: F3 vs. 919 - Wrist Twisters
 
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post #1 of 18 Old 06-08-2011, 10:52 AM Thread Starter
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Rear Spring Rates: F3 vs. 919

For a time, I had both springs and I wanted to know what the difference was between the two.
I couldn't find the spring rates anywhere online (didn't really know where/how to look).
SO... since my sister's husband races cars, he gave me the name of a local race shop & I headed in there toting both springs and a camera.

Here are the results...

The F3 spring rated at 713 Lb/In




The 919 spring rated at 846 Lb/In



So there it is... take it or leave it... at least now you know

Spoiler:

...AND KNOWING IS HALF THE BATTLE


Abba Zaba, you my only friend.
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post #2 of 18 Old 06-08-2011, 10:55 AM
Seņor Calamares
 
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cool. what year 919 spring?

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post #3 of 18 Old 06-08-2011, 11:00 AM Thread Starter
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That'd be an '04.

(Mntnceguy would have to confirm)

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post #4 of 18 Old 06-08-2011, 11:22 AM
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Quote:
Originally Posted by omaha_919 View Post
That'd be an '04.

(Mntnceguy would have to confirm)
ya pretty sure the 02 n 03 had yellow springs.


now the question is what would be the right spring rate for a rider of ~ 160lbs

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post #5 of 18 Old 06-08-2011, 11:27 AM
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how much initial preload did you measure it with?

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post #6 of 18 Old 06-08-2011, 12:06 PM Thread Starter
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I'm not sure what you're askin' Zaq... but I'd say 1" if I had to guess.


Here's how it was explained to me as it was being done:

the spring goes on the platform,
then the jack is used to compress the platform up against the one above it with the spring between them.
at 1" of compression, that's the measurement they use to rate the spring.

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post #7 of 18 Old 06-08-2011, 12:08 PM Thread Starter
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Quote:
Originally Posted by nd4spdbh View Post
ya pretty sure the 02 n 03 had yellow springs.

I know for a fact that 02 has a red spring, still rocking one currently

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post #8 of 18 Old 06-08-2011, 12:53 PM
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that's basically what I was asking, they just called it "compression".

Quote:
Originally Posted by omaha_919 View Post
I'm not sure what you're askin' Zaq... but I'd say 1" if I had to guess.


Here's how it was explained to me as it was being done:

the spring goes on the platform,
then the jack is used to compress the platform up against the one above it with the spring between them.
at 1" of compression, that's the measurement they use to rate the spring.

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post #9 of 18 Old 06-08-2011, 01:12 PM
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Quote:
Originally Posted by omaha_919 View Post
I know for a fact that 02 has a red spring, still rocking one currently
does urs have rebound adjustment at the bottom of the shock? coulda sworn the 02-03s were yellow.

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post #10 of 18 Old 06-08-2011, 01:25 PM
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Spring

My 02 had a Red spring with no damping adjustment
Ken

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post #11 of 18 Old 06-08-2011, 01:27 PM
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Quote:
Originally Posted by nd4spdbh View Post
does urs have rebound adjustment at the bottom of the shock? coulda sworn the 02-03s were yellow.
no yellow for 919. Showa always used Honda red for its springs

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post #12 of 18 Old 06-08-2011, 01:37 PM Thread Starter
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Quote:
Originally Posted by nd4spdbh View Post
does urs have rebound adjustment at the bottom of the shock? coulda sworn the 02-03s were yellow.
nope, 02 / 03 didn't have the rebound adjustment.


... is it possible that the F4i had a yellow spring?
because I can see in my mind where something around that time had a yellow spring.

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post #13 of 18 Old 06-08-2011, 01:40 PM
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Quote:
Originally Posted by zaq123 View Post
no yellow for 919. Showa always used Honda red for its springs
(cough... my crf250x with showa front n rear has a yellow )


coulda sworn there were some years of the 919 with a yellow.. guess not.

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post #14 of 18 Old 06-08-2011, 01:41 PM
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Quote:
Originally Posted by omaha_919 View Post
nope, 02 / 03 didn't have the rebound adjustment.


... is it possible that the F4i had a yellow spring?
because I can see in my mind where something around that time had a yellow spring.
F4i is yellow

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post #15 of 18 Old 06-08-2011, 01:50 PM Thread Starter
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^ Google image search confirms >link<

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post #16 of 18 Old 06-08-2011, 02:05 PM
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Quote:
Originally Posted by nd4spdbh View Post
(cough... my crf250x with showa front n rear has a yellow )


coulda sworn there were some years of the 919 with a yellow.. guess not.
when I said always, I meant 919 always

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post #17 of 18 Old 06-08-2011, 03:17 PM
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Quote:
Originally Posted by zaq123 View Post
that's basically what I was asking, they just called it "compression".
I think what zaq was alluding to was whether they did an initial displacement before doing the test displacement and measurement.

Also, keep in mind that whatever reading is, will reflect the accuracy of the test rig, re displacement measurement and force measurement, as well as the actual spring rate of the example being tested. When I say actual spring rate of the example, I mean what it really displays as compared to whatever it's governing spec is.The spring could be from a +/- 1 to even 3 % allowable range as compared to spec.
The point is this, the spring spec could be higher or lower than what was measured, and that's before whatever test error there was.
But for sure ,your check confirms what others have been saying all along, in other words the 04 and later springs are mush soft, below 900 # per inch and somewhere in the mid to upper 800s.
Thanks for taking the time to get the test done.
Good on you !!!

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post #18 of 18 Old 06-08-2011, 04:58 PM
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Quote:
Originally Posted by omaha_919 View Post
I know for a fact that 02 has a red spring, still rocking one currently
me too gotta love that red

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