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Old 08-14-2008, 10:45 AM   #1
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Default Petroilum shock oil wt vs silicone oil wt?

The HPI website here http://www.hpiracing.com/products/en/z141
says that "Silicone oil weights are not equivalent to petroleum shock oil weights."

What is the silicone equivalent weight of this oil?
or
What is the measure thickness of this 5 wt oil in centipoise?

I want to be able to compare HPIs petroleum weights to silicone weights.

Thanks!!
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Old 08-16-2008, 06:38 AM   #2
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Good question , wish I or anyone knew the answer .
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Old 08-16-2008, 09:30 AM   #3
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I just found a way to get rough equivalents! Use this website:
http://www.twf8.ws/php/tip/shock.html and these two charts as cross references and use CST 40 deg as the measurement unit standard.


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Old 08-16-2008, 09:36 AM   #4
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That is for petrolium oils . Doesn`t cross petro to silicone like what he is asking .
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Old 08-16-2008, 09:40 AM   #5
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Just use silicone and you will never have to worry about petroleum weights.

If you are trying to find a silicone equivalent for a car that came with petro just start with the same weight silicone and adjust as needed.
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Old 08-16-2008, 09:42 AM   #6
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Quote:
Originally Posted by wingracer View Post
Just use silicone and you will never have to worry about petroleum weights.

If you are trying to find a silicone equivalent for a car that came with petro just start with the same weight silicone and adjust as needed.
He designed a shock prototype and experimenting with different oils .
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Old 08-16-2008, 03:29 PM   #7
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I've decided to start using CST as my measurement standard for shock oils.

The range of shock oils that I have found at RC hobby stores is typically silicone with a CST range of 100 CST (10 wt silicone) to 500 CST (40 wt silicone).

According to the petroleum oils for motorcycle forks, that chart ranges from 5.5 CST to 155 CST.

So having both petroleum and silicone oils as options, we have an available range of 5.5 CST to 500 CST.

I am now using 50 CST (about 5 wt silicone) in my shock prototype now. It's OK but still way too much damping.
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