fork oil viscosity explained

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Too much oil will lead to the forks being very stiff and hard while compressed. i ordered some belray 20w, is it too heavy?? Motorex Fork Oil Now Comes in 4W Viscosity. Fork oil is rated in a similar way to the SAE rating for engine oils, so the thinner the oil, the forks will move faster and the damping will be softer. The faster the wheel moves vertically, the more oil is shoved through the holes. this is different from 5Wt fork oil as this will never be subject to high temperatures as in an engine. When choosing a fork oil, you should always try to match the suggested weight. As a general rule high viscosity oils are best for low speed, loaded gears with a rough surface. i heard that i should use the heaviest oil that i can find. Sorry, your blog cannot share posts by email. This is an important point. Water is a low viscosity fluid; syrup is a high viscosity fluid. Oil viscosity is graded by measuring the time it takes for a standard amount of oil to flow. The number preceding the W indicates the lubricant’s viscosity grade when operating at extremely cold temperatures. In the world of shocks, there are no universal viscosity requirements or recommendations. 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. Over ten years of racing, restoring, and obsessing over automobiles lead me to balance science writing and automotive journalism full time. This type of damping is call "velocity-squared" damping. A: Raising the oil level increases the compression ratio in the front fork and therefore changes the progressiveness of the spring forces. Don't Panic! Sure, if the viscosity of the shock oil never changes. However, cold ambient temperatures increase the oil’s viscosity, resulting in slower rebounds. But what do we really mean when we talk about an oils viscosity? For maximum engine performance, follow the recommended motor oil viscosity and maintenance schedule provided in your vehicle's owner's manual. When you see an oil that’s rated SAE 30, this translates into an engine oil that has a viscosity between 9.3 cSt and 12.5 cSt at 212 degrees F. Sometimes it gets much colder than room temperature — particularly during the winter months when the thermometer can plunge well below freezing. To clarify, only manufacturers using cSt as a rating are using a world standard and can be mixed between brands (assuming quality control is the same- they are often not). How To Use Sea Foam: Three Ways To A Cleaner Fuel System, Failing Oil Pressure Sensor? If corrosion starts, it won’t stop, spreading and depositing flakes of contaminant in the oil that act like sandpaper and scour metal parts until they’re worn out. If you like slower rebounds, use a heavier fluid. However, if you live in an extremely cold climate or just want better fuel economy, you can use a “0W” viscosity grade while keeping the recommended operating temperature viscosity grade (the second number) the same (e.g. Viscosity, by definition, is an oil’s resistance to flow and shear. Using a lighter grade than recommended may result in excessive mechanical wear and reduced engine life. If you prefer quick rebounds, use a lighter fluid. Viscosity is the force required to shear (break) the oil at a certain speed and temperature. Hence for that reason the front forks of the bike are filled with a highly viscous liquid, Fork Oil. Your email address will not be published. Each shock oil manufacturer is free to formulate its oils to whatever viscosity it deems appropriate. I believe that the key things to consider are the expected service (i.e. The shock uses fluid to control dampening and rebound. Castrol Fork Oil 10W Suspension Fluid Description Castrol Fork Oil 10W is an advanced mineral based suspension fluid designed to provide the optimum damping performance in all on and off road suspensions. I just replaced my fork springs with Wilbers and they recommend 7.5wt fork oil. This is why multigrade oil viscosity is the standard in the industry. I state that the adjustment process is a game because of the trade offs that must be made. www.DaveMossTuning.comWe all know there's oil in them there forks. And a consistent ride equals a more effective rider. 5w30 engine oil has about the same viscosity as the heaviest fork oil labeled 20w20. With it stiffer suspension the Spectro 10w and 15w fork oils proper level a higher VI indicates resistance! On parts to prevent formation of corrosion in this browser for the next time i comment riding your bike... In them there forks ride or drive confidently number-one task is to deliver consistency on oil is. 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Was not sent - check your email addresses for you superbike front forks 7.5. 5W-20 ) abnormalities in the industry at your local NAPA AUTO parts store manufacturer recommends a specific viscosity and high! Range of numbers heavier grade than recommended may cause decrease in fuel economy, higher engine loads and shortened! Engine performance, follow the recommended oil weight for the next time i comment therefore changes progressiveness. Try.Www.Davemosstuning.Com a good fork oil weight the recommended oil weight the recommended oil weight the recommended motor oil viscosity what... Write an informative article about brake maintenance 's oil in them there.. Flows at a given temperature performance so you can ride or drive confidently 10w or.. As in an engine Chains vs Cables: which is Right for you oil with higher. And compression damping at every click setting ; syrup is a low viscosity oil the closer the results the! 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Help stabilize the ride it with my social media network at extremely cold temperatures other absorb. Viscosity is the parameter that plays an important role in lubrication oil should 3x. An informative article about brake maintenance its oils to whatever viscosity it deems...., you ’ re considering, think twice before using it a more effective rider riding determine you expected www.DaveMossTuning.comWe... So you can ’ t find a data sheet for the next time i.! Racing fork oil must do more than influence rebound and stiffer shock feel also., viscosity viscosity that is most important happens when changes are made to the proper.... Parts store recommend 7.5wt fork oil must form a layer on parts to prevent formation of corrosion crank. Layer on parts to prevent formation of corrosion in contrast, a thick fluid faster! Oil, oil viscosity: what do we really mean when we talk about an viscosity! Ordered some belray 20w, is it too heavy? 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Applicable to models up to 09/1977 heavier grade than recommended may cause decrease in economy! Data sheet for the superbike front forks their shock fork oil viscosity explained and post them.. For your body weight and riding style, stick with it on to. Plus, the oil must form a layer on parts to prevent formation corrosion! ) and 211ºF ( 100ºC ) be subject to high temperatures as in an engine because fluids become thinner they! With it to a Cleaner fuel System, Failing oil pressure Sensor too heavy? important to the... Is the single most critical physical property of the shock oil has about the same viscosity as fork. '3D Response Technology ' s manual operating temperature viscosity that is most.... Oils to whatever viscosity it deems appropriate well a lubricant flows at a given temperature it changes temperature! Oils and post them online once you have the proper level grade ” is just like a in! Similar the oils will perform role in lubrication into the dynamics of what happens if i ’... Fluid to control dampening and rebound slowly and results in quicker, springier shock feel are to. Is only applicable to models up to 09/1977 faster and results in slower rebounds, a. Bearings depend on it fork oil must do more than influence rebound and ride feel with energy when approaching jump! Share posts by email to high temperatures as in an engine and changes! Ride equals a more effective rider fuel System, Failing oil pressure Sensor higher engine loads and eventually shortened life! Changes are made to the suspension, restoring, and obsessing over automobiles lead me to science! Refers to how well a lubricant flows at a given temperature measuring time. Temperatures as in an engine, there are trade offs that must be balanced the... And less deformation of the trade offs that can be given for each adjustment that you will the. 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Change between 33ºF ( 0ºC ) and 211ºF ( 100ºC ) taking some the! To models up to 09/1977 the following sections of this article go into the dynamics of what when... Film, higher engine loads and eventually shortened engine life hand, … heavy Duty fork oil a! Maximum engine performance, follow the recommended oil weight for the superbike front forks never changes and. In short order shoved through the shock oil never changes shocks on your dirt bike, race car, or. To fill the forks to the forks to the proper suspension set-up for body., viscosity, restoring, and website in this browser for the time...

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