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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Biggest factor of fuel/oil that affects jetting
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[QUOTE="jaguar, post: 1471007, member: 19340"] Aha, now the plot thickens. Months ago when I spent dozens of hours studying 2 stroke engine oils I had the feeling that it is a very deceptive industry in general although some of the manufacturers are honest. You can see on my engine oils page about different oils I won’t include in my fuel/oil ratio estimator spreadsheet due to some obvious deceptions of theirs. I just performed a comparison test by timing how long it takes for 220ml of oil to travel thru a 25” long tube of 7/32” inner diameter. Maxima Premium 2 took 68 seconds and Motul 800 Off Road took 88 seconds. The temperature was 90 degrees F (32C) and so using an online calculator the oils viscosity at this temp should be 73.7 for Premium 2 and 179 for 800 Off Road. That is a ratio of 2.43 of Motul to Maxima. The ratio of oil travel times is 1.29 so if I multiply Maximas 73.7 by 1.29 to get Motuls true viscosity I get 95, not 179. In my studies I concluded that Maxima was the most trustworthy of the companies so I think Motul has fudged their numbers. They are claiming a higher viscosity than what they truly have. This explains why my previous test of flow rates for the same two oils was off. So now I know that different oils viscosity will affect jetting needs but other than trusting Maxima we have no means of using published data to use in formulas to indicate needed jetting changes due to a change in engine oils (which I need for two of my spreadsheet jetting calculators). So I need to purchase each of the most popular oils and do comparison flow tests to see which ones are fudging their listed viscosities and which aren’t. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Biggest factor of fuel/oil that affects jetting
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