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Savage lady needs help (Read 439 times)

verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28834 L.A. California Gender:	Re: Savage lady needs help Reply #30 - 01/08/18 at 10:02:18 Mnheights wrote on 01/08/18 at 09:38:12: How dose it limit cooling flow? thick oil doesn't flow as fast as thin oil so oil doesn't carry the heat from the hot parts to the cooler very quickly. This was seen as higher operating temps for the same conditions.
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LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10620 Oklahoma Gender:	Re: Savage lady needs help Reply #31 - 01/08/18 at 15:59:32 In a multi weight oil, the oil should not thicken until higher operating temps are reached. OR ... does our engine normally operate at those higher temps routinely ?
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Dave

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Re: Savage lady needs help
Reply #32 - 01/08/18 at 16:30:59

LANCER wrote on 01/08/18 at 15:59:32:

In a multi weight oil, the oil should not thicken until higher operating temps are reached. OR ... does our engine normally operate at those higher temps routinely ?

The oil doesn't thicken as it gets hot - it just thins out less as the temperature rises.

I wonder if the heaver viscosity oil actually pulls more heat away from the piston skirt to the cylinder - which would increase the cylinder/engine case temperature while reducing the piston temperature?

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Re: Savage lady needs help
Reply #33 - 01/08/18 at 17:47:07

There are two things that cool our motors ,air passing over it and oil moving through it . Pressure can be provided by oils as low as 5w or 10w-30 ,but this oil can only be used when outside temps are below 86 F. 10w-40 and 15w-40 provide better FLOW being thinner than 20w-50, they flow faster through the motor passages providing a thicker film layer between parts and greater quantity of oil removes more heat. All three oils are rated to protect the motor to outside temp in access of 104 F, but the motor will run cooler with one of the 40 weight oils.(Verslagen- 1, tested with his bike in CA )

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Re: Savage lady needs help
Reply #34 - 01/08/18 at 18:30:08

LANCER wrote on 01/08/18 at 15:59:32:

In a multi weight oil, the oil should not thicken until higher operating temps are reached. OR ... does our engine normally operate at those higher temps routinely ?

This is a trick question (and dave is right)
But lets consider normal operating engine temp only.
40wt oil is 40wt and 50wt oil is 50wt... whatever the viscosity is.
40wt will slip thru the orifices faster than 50wt.
At freeway speed you have 50psi, and whatever flow that might be.
It goes to the top of the head and out the cam journals... for the most part.
Thicker at this point will mean less flow, less heat carried away.
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