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Old 06-24-2009, 11:52 PM   #1
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Default #300 shock oil is equal to what wt?

#300 shock oil is equal to what wt?
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Old 06-25-2009, 12:50 AM   #2
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300cst xray oil is similar to just under 30wt xray oil

It'll be different for different manufacturers because the wt scale was not always the same across manufacturers (and the cst one seems a bit different as well)
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Old 06-25-2009, 01:44 AM   #3
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according to this graph someone did on this forum. Xray 300CST oil would be very similar to associated/losi 25WT oil
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Old 06-25-2009, 02:38 AM   #4
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Quote:
Originally Posted by l337 View Post
according to this graph someone did on this forum. Xray 300CST oil would be very similar to associated/losi 25WT oil
Anyone know where the Much More 300, 450 and 550 fits into this?
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Old 06-25-2009, 05:47 AM   #5
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Quote:
Originally Posted by Pablo Diablo View Post
Anyone know where the Much More 300, 450 and 550 fits into this?
CST should be fairly consistent across brands, WT on the other hand.... generally divide by 10 and subtract 5 to get CST in WT, so those would be 25, 40, 50
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Old 06-25-2009, 06:24 AM   #6
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that calculation seems a bit off as the actual values are:

350cst = 30wt
450cst = 32.5wt (ish)
600cst = 35wt
1000cst = 40wt
2000cst = 50wt

again, this is all xray info as that's the data that I have.
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Old 06-25-2009, 07:05 AM   #7
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CST ratings are supposed to be linear, so they should be comparable between manufacters.

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Old 06-25-2009, 08:11 AM   #8
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Quote:
Originally Posted by chris_dono View Post
that calculation seems a bit off as the actual values are:

350cst = 30wt
450cst = 32.5wt (ish)
600cst = 35wt
1000cst = 40wt
2000cst = 50wt

again, this is all xray info as that's the data that I have.
That is not totally correct. The Xray W's are not WT. So Xray 50W is 2000cst, not to be confused with AE or losi 50WT. All those you posted are Xray W not WT

Here are the numbers I got for Losi weights vs, CST when I tested them on a machine. This will at least give you a general idea of whats going on becuase sometimes they vary from batch to batch with all the manufacturers. So if you have some oil that is working good, I suggest you don't let your buddies use it LOL!!

20wt 207cst
25wt 300cst
30wt 344cst
35wt 446cst
40wt 630cst
45wt 749cst
50wt 940cst
60wt 1070cst
70wt 1162cst
80wt 1052cst
90wt 1430 cst
100wt 1653cst

Yes 80 was lighter than 70, I have also had 100 be lighter than 90 and 45 be the same as 40. Like I said, it varys from batch to batch.

Hope this helps.
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Last edited by chicky03; 06-25-2009 at 08:22 AM.
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Old 06-25-2009, 08:21 AM   #9
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'weight' is stupid all together. the centistoke (cst) is an absolute viscosity value. just like 50mph is 50mph regardless of what vehicle you're traveling in.

in my testing, however, most manufacturers oil is around 12x their rated weight in cst. so 25wt x 12 ~ 300 cst. (excluding xray/serpent which is not linear in steps).

short answer: use 25wt.

keep in mind that most oils are really only accurate to about 15%. i have rarely tested a line of oils that doesn't have a step go in the opposite direction, or at least have two weights test out at the same viscosity.

for this reason, i always recommend that a racer change oil in only one shock first, so that you can verify that the change is actually softer/harder than what you're coming from.
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Old 06-25-2009, 08:33 AM   #10
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sidenote - this is like the 3rd or 4th thread in the last month dealing with this same topic. (what's all the sudden interest in shock oil all about)?
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Old 06-25-2009, 08:37 AM   #11
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Quote:
Originally Posted by seaball View Post
sidenote - this is like the 3rd or 4th thread in the last month dealing with this same topic. (what's all the sudden interest in shock oil all about)?
I think it has something to do with your avatar.
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Old 06-25-2009, 08:42 AM   #12
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Quote:
Originally Posted by chicky03 View Post
All those you posted are Xray W not WT
I stated that in my post, but thanks for re-iterating
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Old 06-25-2009, 03:23 PM   #13
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This explains a lot:

http://www.twf8.ws/php/index.php?opt...per&Itemid=175
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