So you can see a large difference in the viscosity index … Up to 5+ weeks at times if complex brain-teaser,  CUSTOM nightmare, with All SPECIAL ORDER hard to find parts. The quality of an engine oil depends on the base stock and its properties as well as on the additives. Since then it has merely become the convention used to indicate suspension oil viscosity despite its technical inaccuracy. Suspension Fluid Viscosity Chart Some of you have changed out your suspension fluid to a heavier or lighter weight fluid or so you thought to change the damping of your suspension. Swelling a seal without counteracting that swelling at least to some degree can result in a failed seal. Besides just the raw viscosity data, there are other considerations to make when selecting a fork oil. This can be used as a guide or reference on how the oil's viscosity … Fork and shock fluids are in fact completely unregulated. For some reason Torco seems to label their oil at double the weight it really is. “insert millennial-melt-down here...", Custom Ship Case 51"x15"x4" (9.5 lbs) Foam prevention, corrosion prevention and seal compatibility are rarely problems and most products will avoid them with little difficulty. Viscosity index … Viscosity index which measures this change is an important characteristic to evaluate shock oils, but even that needs some consideration. The viscosity index reflects how well an oil retains its viscosity at various temperatures, so the higher the index the better. This is due to the very wide operating temperature range mentioned earlier. The viscosity index can be calculated using the following formula for oils with viscosity index less than 100: V I = 100 L − U L − H {\displaystyle \mathrm {VI} =100{\frac {L-U}{L-H}}} where U is … Generally speaking, the less it changes, across a range of temperatures, the better. If wear starts to become excessive, it can result in increased static friction and failing parts. Number to us so we can expect your shipment Prior to you shipping. Anything over 100VI will be serviceable for them, however the newest  fork designs with internal cartridges are much like rear shock designs so the same fluid is often used in them for best results. To Order Email : sales@propilotsuspension.com. Regarding viscosity index. We ship daily UPS, FedEx and USPS for your convenience direct to your home or business. Shock Therapy Suspension Fluid #10 Medium Product Code: STMQT-EA. Bigger numbers are better. Provide a consistent damping force to avoid suspension fade, or in other words, to keep fork dive and suspension rebound steady throughout: Reduce friction and wear between the moving parts, Oil A has viscosities of 5 cSt and 15 cSt at 100°C and 40°C, Oil B has viscosities of 4.5 cSt and 14 cSt at 100°C and 40°C, The viscosity indexes of the two oils are. Viscosity index claimed and real index values rated in CSt are often quite unique, a recent study showed some interesting comparison in rating each suspension fluid at what they call 40 degree CSt and 100 degree Cst. Many variables determine the best ingredients to performance of the suspension fluids. We’ve made it much easier for you to determine what oil you need by creating these charts below that show each weight, the viscosity for each weight at 40 degrees celcius and 100 degrees celsius and also the Viscosity index. When looking at multiple brands though, I wouldn’t recommend going by the weights listed on the bottle. www.DaveMossTuning.comChoices choices choices. But, due to the international SAE standard being so loose, one oil … Front forks as opposed to rear shocks do not produce a lot of heat, so the viscosity to focus on for fork oil is the kinematic viscosity at 40°C, and although a high viscosity index is good, it is not critical since they will not normally reach temperatures higher than 40ºC. In other words, the oil becomes extremely thin at high temperatures and extremely thick at low temperatures. Seal compatibility is fairly simple but very important. Quality of Life, it’s a business Not a Ball and chain! We fully Un-Plug! A higher VI indicates better resistance to viscosity changes throughout broad temperature swings. Since forks and shocks are something I am able to constantly learn about, they remain a constant source of intrigue to me. The scale of viscosity index is numerical in nature, with zero being the most susceptible to changes in viscosity. The difference between good VI and awesome VI is the difference between dropping to 1/4 of your 40C viscosity … Sorry, your blog cannot share posts by email. The Viscosity Index Test (ASTM D 2270) is based on the Kinematic viscosity of the oil at 40°C (104°F) and 100°C (212°F). Fork oils: I prefer Spectro's fork oils, or suspension fluids. Viscosity modifiers in the fluid allow it to maintain the preferred level of consistency even in extreme temperatures and other conditions. On the other hand, a high V.I. They need to: Providing consistency in the damping force is accomplished in the short term through a high viscosity index. By slowing the up-stroke and absorbing some of that energy, the oil eliminates suspension the shock of the spring rebound and stabilizes the suspension for smoother operation. Quality additives and ingredients are extremely important to function. Ideally, obstacles are hit dead center and the two front forks each absorb the impact equally. So specifically with regard to suspension, the greater the VI, the more consistent the damping will be over a large temp change. after hours. Most suspension units use approximately a 5Wt (SAE). They do this by weakening the surface tension of the liquid which pops the bubbles before they can build. Shear stable, high (300+) viscosity index formulation maintains viscosity and film strength while reducing wear. Anti-foam or defoamer additives address the initial formation of bubbles and the ability for those bubbles to persist and build into a head of foam. The main requirements for an engine oil are defined temperature-viscosity properties, protection against wear and corrosion, keeping the engine clean, holding particles like soot or abrasives in suspension… Controls friction, heat, wear, foaming and scuffing in suspension components. We sell really good Suspension fluid that is manufacturer recommended. SEND YOUR BOX UPS and email Tracking Number to us so we can expect your shipment Prior to you shipping. This is a numeric value which indicates the amount of viscosity change that occurs with temperature. Advanced additive system minimizes stiction and reduces running friction while … Many of them are fairly similar, but there are outlying products that may make a difference for users who are unaware of the discrepancies. Suspension fluids are basically a type of hydraulic fluid. while Supply lasts, Reminder to remove push button air bleeders, Separate the items with packaging inside box, You can also send above"case" in the card-board box for added protection when shipping. Preventing friction and wear are important in these applications for a number of reasons. They are straightforward to design, yet there is a lot of opportunity to fine tune and optimize a fluid for specific suspension designs. For long term damping consistency, things like stabilizing additives and shear stable base fluids keep the oil performing like it did fresh out of the bottle. This is because the fork or shock fluid’s main purpose is to dampen the spring rebound following compression. Damper rod forks, which are the most common, utilize two fork sleeves in which one slides inside of the other and these side loads cause wear on those surfaces. A low V.I. Bryson: Here's some data I pulled up on some of the suspension fluid we are using: Viscosity Index for 7wt oil: at 40 degrees Celsius it’s 24.6 V.I. The few properties I listed for each application are, in my opinion, the most important considerations to keep in mind when selecting suspension fluids. This table illustrates my point that different companies measure their viscosity grades according to different standards. Sheesh. ASTM D2270-04 Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100°C. Tuners  and D.I.Y folks should know every drop counts. Suspension fluids are a topic of interest for me for two reasons. Our pricing is surprisingly affordable, We answer every call as much as possible. Subscribe to MotoTribology.com for updates! (Here’s just a sample chart of just 20 “Over the Counter Fluids ” of  over 150 fluids  tested.). Allow about 3-5 business days or so on completing and shipping your brand new Shocks or Forks if everything is easy-peasy. If you are searching for hydraulic fork oil, then in a word, we suggest you that Maxima 55901 10WT should be the… Blowing out seals is no fun and it can be avoided in most cases by selecting quality fork and shock fluids. A very common idea that I come across when speaking with people about suspension fluids is that viscosities are standardized. (RockShox oil … So what oil should you use in your suspension? Instead, look for a fork oil with a high viscosity index (VI). It's not as important as it may look for these reasons. (Choose 2). One other point: The term, "Viscosity Index" has been mentioned. The Viscosity Index is very important in a suspension oil. So just pouring anything into any shock or fork will not provide the intended manufacturers performance. In rear shocks, the kinematic viscosities at both 40°C and 100°C are important. Because of this we now have grades from 2.5W to 30W and everything in between and it is not likely to change any time soon. signifies a relatively large change of viscosity with changes of temperature. For more Information Visit Our “Tech-Tool-Pics” page. Shock Therapy Suspension Fluid #10 Medium Product Code: STMQT-EA. … race proven to deliver superior performance in all suspension systems alters oil. Your BOX UPS and email Tracking number to us so we can expect your shipment Prior to you.. Performance of the suspension fluids actual rating is most accurate by referring to the very wide operating temperature range oil... 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