Re: What factors do you use to determine oil viscosity?
[Re: 440Jim]
#1075527
09/15/11 05:41 PM
09/15/11 05:41 PM
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Joined: Jul 2008
Posts: 30,491 Florida STAYcation
dOc …
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,491
Florida STAYcation
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Quote:
I am not the authority on this, but my 2-cents:
- Engine oil temperature - Bearing clearances - Oil system design / volume - Valve train type (e.g. flat tappet vs. roller) - HP expectation (ie bearing load)
....AND rod side clearance
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Re: What factors do you use to determine oil viscosity?
[Re: ahy]
#1075529
09/15/11 10:37 PM
09/15/11 10:37 PM
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Joined: Jan 2003
Posts: 8,186 Plymouth, MI
Blusmbl
master
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master
Joined: Jan 2003
Posts: 8,186
Plymouth, MI
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Engines that have rod/crank bearings undersized for the expected load (boost on an original n/a motor is a good example of this) will require a heavier weight oil.
I'd consider expected oil temp & bearing clearance the other critical factors.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: What factors do you use to determine oil viscosity?
[Re: BradH]
#1075530
09/16/11 02:28 AM
09/16/11 02:28 AM
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Joined: Aug 2003
Posts: 43,311 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,311
Bend,OR USA
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MY personel N/A drag race pump gas 5W20WT Valvoline non synthetic, same on the street ![](/ubbthreads/images/graemlins/Twocents.gif) High output(above 800 HP) drag race motor 10W30WT or 15w40 or 25W50WT Pennzsoil racing oil ![](/ubbthreads/images/graemlins/thumbs.gif) ,depending on the customers desires ![](/ubbthreads/images/graemlins/1343795-scratchchin.gif)
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What factors do you use to determine oil viscosity?
[Re: Cab_Burge]
#1075531
09/16/11 03:32 AM
09/16/11 03:32 AM
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Joined: Nov 2003
Posts: 6,293 Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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My ![](/ubbthreads/images/graemlins/Twocents.gif) I dont consider Oil Viscosity when I set bearing clearance, so bearing clearance or any other bottom end spec shouldnt be a factor for selecting Oil. If you have 100 PSI at idle with thick oil, its a screw up anyways, and should be addressed, about 30% more oil pressure than needed. I run thicker oil for added protecting from "break down" I dont run the zero weight oil, and very light oil. Sorry but a 1% increase in performance isnt worth it. I try to run 15W-50. This oil has been around a long time, and is the best I have tried. I will run a Semi Synthetic on occasion. Great stuff here. Run a Accumulator, it will provide more protection than anything else. http://www.schaefferoil.com/. . ![](http://i93.photobucket.com/albums/l45/The_Dakota_Kid/65%20Belvedere/IM003441.jpg)
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: What factors do you use to determine oil viscosity?
[Re: Dap]
#1075535
09/16/11 04:25 PM
09/16/11 04:25 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
Dwayne puts my stuff together. So it gets whatever he says to use..
He tells me to run 20w50... but I keep having this occasional delusion that I'm smarter than him. ![](/ubbthreads/images/graemlins/laugh2.gif)
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