Bearing clearances, oil weight, and more...
11-19-2014, 02:28 PM
#41
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I would wonder if I should run tighter Clarence's in a motor that I'm building that will be all forged lower end, have a ProCharger at 8-10psi and never break a water temp of 100°F then say a similar motor that warms up to 200° and stays there. My motor running so cold may not expand as much.. For cooling the bearings, I like the idea of a little lost with a heavier oil "VR1,20-50" and a bigger oil pump.. As for load/vers oil viscosity, I'm not sure.. My cat engines in my OTR semi trucks have a high load, slow rpm deal and run 60-80 psi oil press with 15-40 but the otr Cummins isx engine maybe make 30 psi hot. My new Volvo runs 10-30 summer, 0-30 winter. Not quite a boat motor tho.
11-19-2014, 02:47 PM
#42
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I can't take it any more. Why is everybody referring to 10w-anything, but I think mostly 40 has been discussed here as being thin. First: It's only 10 at start up and second: more important, I believe. Is as long as there is oil on the bearing (shear factor!) where is the problem? 30w and certainly 40w isn't too thin. Before synthetic oils every bodies "God of Engines" MERCURY recommended 40w in the summer heat and 30w when it was below "X" temp. Engines weren't blowing up back than. And the truth of the matter is the oil wasn't nearly as good as it is today.
11-19-2014, 08:49 PM
#43
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In my last post I meant to say I like the idea of a looser clearance with more oil volume. I also agree that running a cold motor hard isn't a good thing but what's a guy to do? Us blower motor guys run cold.. The oil gets hot, just not the rest.
11-20-2014, 06:00 AM
#44
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5 quart capacity that has an allowable usage of 1 quart every 600 miles. This same motor has a recommended change interval of 10,000 miles.... Do the math. Less than half way through your oil change you could be replacing your engine instead of the oil. 0w-20 is like antifreeze consistency.
I have never been a proponet of thin oils for additional fuel milage, I would rather have protection of a thicker fluid at the cost of milage.
Ken
Last edited by minxguy; 11-20-2014 at 06:07 AM.
11-20-2014, 06:15 AM
#46
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Ken
11-20-2014, 06:30 AM
#47
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In 2009 the federal government mandated auto manufacturers recommend 20wt oil. If the manufacturer did not comply they had to pay a fine for that model. Not all manufacturers have complied with every model. What I have noticed when the switch to 20 wt was made. Oil consumption is very high most cars are running out of oil before there normal change interval. I work on a ton of cars. Probably 30-50 different makes and models a week. This is what I have witnessed as a trend with 20wt oils. You can have them.
Lets face it, we had cats in the past and we were running higher zinc oils that were of a higer viscosity and much lower oil consumption
Is the lowed zinc levels really a result of energy conserving measures (lower oil viscosity/less ring tension) applied by the OEM's to help meet federally mandated CAFE requirements which in turn cause more oil consumption which in fact poisions the cat?
Ken
11-20-2014, 06:45 AM
#48
I find it interesting that in the new vettes, GM recommends 5w30 for normal driving, but states for high performance driving or racing, 15w50 is to be used.
Id consider when my boat engines are at 4000-5700 rpm out on the lake, thats high performance operation. My stuffs quite a bit looser and making quite a bit more power than a new vette engine.
Id consider when my boat engines are at 4000-5700 rpm out on the lake, thats high performance operation. My stuffs quite a bit looser and making quite a bit more power than a new vette engine.
11-20-2014, 09:15 AM
#49
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I find it interesting that in the new vettes, GM recommends 5w30 for normal driving, but states for high performance driving or racing, 15w50 is to be used.
Id consider when my boat engines are at 4000-5700 rpm out on the lake, thats high performance operation. My stuffs quite a bit looser and making quite a bit more power than a new vette engine.
Id consider when my boat engines are at 4000-5700 rpm out on the lake, thats high performance operation. My stuffs quite a bit looser and making quite a bit more power than a new vette engine.
11-20-2014, 09:24 AM
#50
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Not sure about the government mandate for 20 weight, but let me throw this out for discussion. Do you think that there might be a corolation between the mandated amount of zinc in oil, running a lower viscosity, and lower oil ring tension all having an effect on catalyic converter life?
Lets face it, we had cats in the past and we were running higher zinc oils that were of a higer viscosity and much lower oil consumption
Is the lowed zinc levels really a result of energy conserving measures (lower oil viscosity/less ring tension) applied by the OEM's to help meet federally mandated CAFE requirements which in turn cause more oil consumption which in fact poisions the cat?
Ken
Lets face it, we had cats in the past and we were running higher zinc oils that were of a higer viscosity and much lower oil consumption
Is the lowed zinc levels really a result of energy conserving measures (lower oil viscosity/less ring tension) applied by the OEM's to help meet federally mandated CAFE requirements which in turn cause more oil consumption which in fact poisions the cat?
Ken
