Recent content by Boxnuts

Originally Posted by userfriendly Have a look at; ASTM D5621, 2603,6022, 7109, 6278 and E1875 I posted HPL's 10W20 in their thread, as that pcmo might be of interest to this discussion. Hi Sorry, You've lost me. What thread?

Hi Gokhan Thank you for your reply, straight to point as usual. I was attempting to show the possible problems with extrapolating beyond the data points using the Walther astm341 simple formula. I was comparing astm341 with the enhanced Walther 3 with variable C constants. So this is not the...

In order to pursue Harman index, etc, calculations, the first step is to extrapolate the viscosity data to 150°C. But there have been warnings that the formula cannot be relied upon. First some background. Extrapolation is usually done with the help of online calculators and Apps for your...

Originally Posted By: camrydriver111 Disappointing NOACK, and HTHS. Just when people are saying Castrol is stepping up their game. They still can't get their sums right. Just check out the viscosity indexes in the above posts, in not one of them do the kV40 and kV100 figures "compute" to the...

There different rules in different parts of the world. In the UK I believe that the basic rule is that the speedo shall never read less than actual. So to allow for errors the speedo has to set to about 5% fast as standard.

Is Berniedd allowing for the fact that in a 4 stroke engine, camshaft and hence valves go at half engine speed?

Originally Posted By: gregk24 Originally Posted By: ZeeOSix Originally Posted By: gregk24 So if they are truly positive displacement would a 15w40 be fine in a car requiring 0w20? It should not make a difference right? A higher viscosity oil will make the oil pressure higher at any given RPM...

Quote: Now, where on that chart is there any reference to KV40? The KV40 is as irrelevant as CCS or MRV numbers for determining whether it's a 30 or a 40. Garak Curious choice of table to illustrate your point. KV40 figures do appear in 3 columns to KV100 in two columns. Anyway this seems...

Despite the slightly higher VI by the time you get down to 0°C the M1 0W-40 is 563 cSt and the Mag 1 5W-40 is 645 cSt so it's now a bit thicker, which is probably what you would expect.

Originally Posted By: Sawdusted Save the table as a JPEG file. You may need to save the spreadsheet as a PDF file first then convert it to JPEG. Thanks for reply. Presumably I have to put the JPEG file on to Photobucket or similar and then link to that in the post. This would be normal for...

Sorry about posting here but I can't find the appropriate place to post. Question: How do you post a table of data? Is it possible to create one using this editor? I have tried copying from a word processor and all I get is a list of the table contents. Thanks

The VI calculation does produce some curious figures. If we take it to the extreme and calculate (using Widman) the VI for "perfect" oils i.e. oils that have the same viscosity at 40°C as at 100°C. We get. A 20cst oil has a VI of 874 A 5cST oil has a VI of 1647. If the VI calculation was what I...

Originally Posted By: Shannow I think that the ads are simply that...ads. Ads contain "fluff", which isn't science, but is intended to stir an emotional response, and get customers to recognise them on the shelf. The cheesy ads do that, obviously...not scientific, but they are ads. McDonalds...

Originally Posted By: Volv04Life Theres only so thin they can go right?? There must be a limit somewhere but who knows where. 0W, 5W etc grades are not really about operational thickness. They are more about usability at very low temperatures. SAE have said that the new 16 grade is the first...

Hi On this side of the pond we can get a jack pad for use with seams. Strangely enough I can't find it on ebay.com http://www.ebay.co.uk/itm/Rubber-pad-rub...=item2332cea313 R-b