(quoted from post at 14:43:08 04/07/13) Have a 1940 9n with 80 PSI compression all around. Weighing simply a ring job with replacement bearings on crank.
Question is: will this alone fix oil pressure? Or is there more to replace to bring pressure back up?
(quoted from post at 18:12:48 04/07/13)
You do know the N-Engine was designed fer 30-wt detergent oil, don't you??? 15-40wt oil is really just 15wt oil with heat sensitive additives that make it act like 40wt oil. CHANGE yer engine oil to 30wt detergent and watch yer oil pressure climb.
........Sheesh; respectfully the amazed Dell
Weighing simply a ring job with replacement bearings on crank.
..... is there more to replace to bring pressure back up?
Utter nonsense. If there is any observable change (doubtful) you will see a small drop in hot oil pressure with a grade 30 oil. Additives or not SAE 15W40 has a higher viscosity than straight SAE 30 when hot, And that is what affects hot oil pressure - PERIOD!!!!
TOH
(quoted from post at 22:09:12 04/07/13)
Whats up with the cold viscosity of the 15w40 ? Those numbers look like straight 40 ??
Shouldn't the cold (15w) be somewhere between the 5w/10w and the straight 30 ?
62.5 - 69.8 - [color=red:d03a74d4ac]116.0[/color:d03a74d4ac] - 87.0
Because oil viscosity changes exponentially with temperature a non-logarithmic graph can't visually separate the curves over the entire temperature band very well and I only provided the upper end on the graph so you could clearly see the separation up there.
(quoted from post at 10:19:21 04/08/13) Always thought that the engine needs minimum 10 psi oil pressure for every 1000 rpm.
(quoted from post at 04:09:43 04/09/13) and genrators and irrigation pump engines at zero oil pressure with light weight crankshafts and two & four cycle outboard engines and motor cycle engines.
gravity:
its the gravity load on the crankshaft.
(quoted from post at 12:46:16 04/09/13) Multi weight engine oil has viscosity index improvers that reduce the thinning with increase in operating temperature.
An SAE 10-30 wt oil is base 10 wt with viscosity index (VI) improver (heat sensitive additives)
The VI improver additives are susceptable to shearing damage in non synthetic oil. The damage can occur very early in the life of the oil, reducing the effective weight of the oil from 10W-30 to 10W-20.
Ever notice that when the oil is changed when using non synthetic multiple weight oil, the oil pressure gauge shows an increase in pressure? After the oil is used for a while, the oil pressure gauge shows a reduction in the oil pressure because the VI improvers have been damaged by internal engine shearing action.
Using synthetic muti weight oil the shear damage issue is basically eliminated.
Still, Prefer using straight SAE 30 non synthetic and change it once a year in my N whether it is used or not.
(quoted from post at 05:28:00 04/14/13) The Blue ribbon goes to LB!!! Changed the new oil gauge with another. Amazing how that brought up the oil pressure (Ha Ha!). Will need a ring/bearing job soon enough. Have line on a 9n engine parted out. I think I will use the tractor while I rebuild that, then do the swap out. Too much fun.
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