oilman Posted March 16, 2008 Share Posted March 16, 2008 To kick off Opie Oils new 12 part series of interesting oil facts we thought that we would address the statement “My oil has turned to water!” Let’s be objective and look at the actual figures involved here, emotional expressions such as ‘turned to water’ just will not do. Engineering is supposed to be a science afterall! So! Almost all modern jet engines run on 5cst at 100degC synthetic ester oil. Needless to say, some bearings will actually be running at a temperature of perhaps 200degC; so the true oil viscosity in these situations is in fact 1.5cst. This is really thin, much thinner than any car or bike engine oil even in a race engine. But is it as thin as water? NO! At 20degC water has a viscosity of 1.0cst and at 50degC it drops to 0.55cst. Just for comparison, a 0w-20 oil will have an approximate viscosity of 107cst at 20degC, 32cst at 50degC, 8.9cst at 100degC and 2.3cst at 200degC. So there you go, it may look like water but it certainly isn’t! Cheers. Guy & The Opieoils.co.uk Team Note: Centistokes (cst) is the measure of a fluid's resistance to flow (viscosity). It is calculated in terms of the time required for a standard quantity of fluid at a certain temperature to flow through a standard orifice. The higher the value, the more viscous the fluid. Quote Link to comment Share on other sites More sharing options...
Daston Posted March 16, 2008 Share Posted March 16, 2008 every day is a school day Quote Link to comment Share on other sites More sharing options...
oilman Posted March 16, 2008 Author Share Posted March 16, 2008 Those rulers hurt though:( Pay attention at the back of the class:eyebrows: Cheers Quote Link to comment Share on other sites More sharing options...
bignum Posted March 18, 2008 Share Posted March 18, 2008 I`d be interested to know what the cst is of pro-s 10/50 @120d/c,cheers. Quote Link to comment Share on other sites More sharing options...
oilman Posted March 18, 2008 Author Share Posted March 18, 2008 At 120degC Pro S 10w-50 will be 11.2cst which is the equivalent of an sae 30 at 100degC Cheers Simon Quote Link to comment Share on other sites More sharing options...
SteveR Posted March 18, 2008 Share Posted March 18, 2008 I get it, but what's a good/bad number in our engines? Quote Link to comment Share on other sites More sharing options...
oilman Posted March 19, 2008 Author Share Posted March 19, 2008 How do you mean? Cheers Quote Link to comment Share on other sites More sharing options...
SteveR Posted March 19, 2008 Share Posted March 19, 2008 How do you mean? Cheers Presumably, too high a number = too viscous and not a great lubricant (or at least not an efficient one)? And too low a number = not provising enough protection? Or am I way off?? I expected a certain range to be key to providing the best protection for our engines - e.g. the weighting, and the factor behind those numbers that drive the choice of weighting - the Centistokes values? I'm porbably just confiused. Quote Link to comment Share on other sites More sharing options...
Pete Posted March 19, 2008 Share Posted March 19, 2008 Oil isn't water, that's amazing. Quote Link to comment Share on other sites More sharing options...
michael Posted March 19, 2008 Share Posted March 19, 2008 Oil isn't water, that's amazing. Phew! I thought I was the only one Still at least I won't have to read about this on 50 other forums today... oh... Quote Link to comment Share on other sites More sharing options...
Havard Posted March 19, 2008 Share Posted March 19, 2008 Is it true that blood is thicker than water? Quote Link to comment Share on other sites More sharing options...
michael Posted March 19, 2008 Share Posted March 19, 2008 Is it true that blood is thicker than water? It depends which one you are trying to sell I think. Quote Link to comment Share on other sites More sharing options...
Pete Posted March 19, 2008 Share Posted March 19, 2008 I'm waiting for part 2. "Oil goes black when it's dirty" Quote Link to comment Share on other sites More sharing options...
RedM Posted March 19, 2008 Share Posted March 19, 2008 I'm waiting for part 12: Oils well that ends well. Quote Link to comment Share on other sites More sharing options...
SupraStar 3000 Posted March 19, 2008 Share Posted March 19, 2008 Oil isn't water, that's amazing. Damn it! Thats this summers fun in the paddling pool ruined Quote Link to comment Share on other sites More sharing options...
Scoboblio Posted March 19, 2008 Share Posted March 19, 2008 I'm waiting for part 12: Oils well that ends well. Quote Link to comment Share on other sites More sharing options...
juanchan Posted March 19, 2008 Share Posted March 19, 2008 Centistokes (cst) is the measure of a fluid's resistance to flow (viscosity). It is calculated in terms of the time required for a standard quantity of fluid at a certain temperature to flow through a standard orifice. The higher the value, the more viscous the fluid. Oh how I remember those lonely afternoons sat in a chemistry lab at uni watching Fairy Liquid flowing through that orifice. Turned out it had too many bubbles that we couldn't remove, so any readings were disregarded as being inaccurate Quote Link to comment Share on other sites More sharing options...
Pete Posted March 19, 2008 Share Posted March 19, 2008 It was a terrible joke and certainly didn't deserve clapping! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 19, 2008 Share Posted March 19, 2008 Oilman: Was it your dad who had a MKIV TT? Or have I got you mistaken for someone else? Just curious. Cheers. Quote Link to comment Share on other sites More sharing options...
JustGav Posted March 19, 2008 Share Posted March 19, 2008 Oh how I remember those lonely afternoons sat in a chemistry lab at uni watching Fairy Liquid flowing through that orifice. Turned out it had too many bubbles that we couldn't remove, so any readings were disregarded as being inaccurate I do sort of remember doing the ethanol decay experiment...I use the words sort of because I had decanted 200ml of it into 50ml of pepsi and drunk it...the rest of the day was a bit well missing. Quote Link to comment Share on other sites More sharing options...
Thorin Posted March 19, 2008 Share Posted March 19, 2008 I'm stunned, oil doesn't turn into water? Quote Link to comment Share on other sites More sharing options...
Thorin Posted March 19, 2008 Share Posted March 19, 2008 I get it, but what's a good/bad number in our engines? I read another of his insights before, apparently all oils are the same thickness or something. I'm going to try using milk next change. Quote Link to comment Share on other sites More sharing options...
oilman Posted March 20, 2008 Author Share Posted March 20, 2008 Oilman: Was it your dad who had a MKIV TT? Or have I got you mistaken for someone else? Just curious. Cheers. No he hasnt, would be cool if he did as he is 75 Cheers Guy. Quote Link to comment Share on other sites More sharing options...
oilman Posted March 20, 2008 Author Share Posted March 20, 2008 I read another of his insights before, apparently all oils are the same thickness or something. I'm going to try using milk next change. You might want to go back and read it again, your a little off the mark there. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 20, 2008 Share Posted March 20, 2008 My mother used to drive my MKIV TT and my R33 GTR at 86 and 88 years of age respectively, she'd have a go now at 96 if I'd let her She was heading for my pals Ducati the other week, but alerted him when she rattled the Zimmer frame on the back door. Quote Link to comment Share on other sites More sharing options...
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