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Old 09-27-2018, 05:29 PM
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Join Date: Jun 2011
Last Online: 09-28-2018 11:18 PM
Location: Paraguay
Posts: 11
Default 2 Stroke Oil CONTEST

     

The person that gets closest to my fuel/oil ratio calculators recommended ratio (for your engine and oil) wins a $25 credit towards any of my 2 stroke spreadsheet calculators. Just list your max RPM (or engine size and type riding and I’ll estimate the max RPM), type of cylinder cooling (air or water), and which oil you use from the list below. Everyone who participates gets a free copy of the fuel/oil ratio calculator.
Amalie - SynPlus
Bel-Ray - SL-2, MC-1, H1-R
Klotz - BeNOL, Techniplate TC-W3
Motul - Scooter Expert, 510, 710, 800 Off Road, 800 Road Racing, Kart Grand Prix
Maxima - Scooter Pro, Super M, Formula K-2, Premium 2, Castor 927
Amsoil - Dominator, Saber
Repsol - Moto Racing, Moto Off Road
Shell - Advance Ultra
PJ1 - Goldfire Pro
Red Line - AllSport
Yamaha - Yamalube 2R
Lucas semi-synthetic
Royal Purple HP 2-C
Schaeffer Supreme

How does my oil ratio calculator work? It uses the oils viscosity in combination with the change on it that the estimated upper cylinder temp (estimated by max RPM and type of cylinder cooling) causes and figures out a ratio that results in a target diluted viscosity (diluted by gasoline). This ratio is usually very close to what oil manufacturers recommend.

“Viscosity is the single most important physical property of a lubricant. It is a crude measure of a lubricant's molecular constitution from the standpoint of hydrocarbon chain size. Viscosity determines film thickness and film strength.” http://www.machinerylubrication.com/...iscosity-index

“Viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.” http://www.engineeringtoolbox.com/dy...ity-d_412.html

“Viscosity is very important because it affects the oil's ability to reduce friction and transfer heat.”
http://www.oilspecifications.org/art...-viscosity.php

“An oils first line of defense is its viscosity. The ability of the oil film to prevent contact between the rings and the cylinder is a function of an oils viscosity. Generally speaking, the more viscous or thicker an oil, the greater load it will carry.”
http://www.aijiuyujia.com/best-2-str...rcycle-oil.pdf

Last edited by jaguar; 09-28-2018 at 11:18 PM.
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Old 09-28-2018, 12:49 AM
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Join Date: Jun 2011
Last Online: 09-28-2018 11:18 PM
Location: Paraguay
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Examples of my calculators trueness:
fully synthetic oil:
Motul recommends their 800 Off Road be used at 50:1 and my calculator shows its ratio to be 51:1 for a water cooled engine reving to 12,000 RPM.
I choose 12,000 for extreme use because that is what a modern 125cc revs to. And the oil manufacturers usually recommend a racing oil at a ratio that will protect an extreme motocross engine such as a 125cc.
synthetic/mineral blends:
Golden SX2 is recommended at 32:1 and my calculator shows that same ratio for a water cooled engine up to 12000 RPM.
Golden Spectro is recommended at 42:1 and my calculator shows exactly that for a water cooled engine up to 12000 RPM.
mineral oil:
Spectro 2T is not advertised as a racing oil but something that can be used in oil injector systems so we can say it is for up to 10,000 RPM at the recommended ratio of 32:1 which is exactly what my calculator shows for it at 10,000 RPM.
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Old 09-28-2018, 10:49 PM
bjunior's Avatar
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Join Date: Feb 2012
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Location: dallas tx
Posts: 854
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What bike brand and cc?
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Old 09-29-2018, 01:35 PM
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Join Date: Sep 2018
Last Online: 09-29-2018 01:47 PM
Location: california
Posts: 2
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250cc water cooled mx yamalube 2r 40:1
125cc water cooled mx yamalube 2r 40:1
80cc water cooled mx yamalube 2r 40:1
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