The above makes sense to me if the relief valve/regulator is from a top-down view, and the spring is a compression one. The artist seems to have a hard time making a pipe thread female fitting on the right of the drawing.
Maybe the pressure drops because the sending unit is closer to the oil pump, and oil is finally going thru the small paths in the now warm motor - there is less back-pressure and it is reflected on the dash. Also, the oil filter assembly is warm, so oil passes thru that branch easier.
On a 2F...
Sorry if I didn't get you the first time Steamer. But as far as pressure is concerned, the F will not allow unregulated (high) pressure to the filter beyond a certain pressure (I colored the filter side a brown oil circuit). The bifurcation divides the oil stream, and its pressure from the oil...
This is my understanding:
The bifurcation of the F's oil pump discharge of high pressure oil is as follows: "One part enters into the oil hole in the cylinder (there is a small cylinder bored out of a lower part of the block - my subjective take), while the other, after passing through the oil...
So, the F is described in this video
I don't know which branch is the overflow branch on the pressure regulator? My guess is that the pressure is maintained in the lubrication circuit. A radiant-heated oil filter can (exhaust manifold) would make the coffee percolation even more perfect (more...
The needle is either too close to tell, more pressure, or less pressure. This is how I interpret it.
My oil pressure is clearly higher in the summer, the needle is at the third mark. Now it leans to the right of vertical, when hot. Before (Denso filter) it was about as parallel as the...
Yes, all of that is good. I'm just neutral to using zinc. Kinda pricey, I'd be using a mail-order oil or an additive, and I would rather spend the money on more frequent fresh oil for the crankcase.
I've never heard of problems, by not using zinc. I've seen the wear upon breakdown, but it...
There is only one split/branch on the F oiling path (unless you are thinking about the oil filter). Do I interpret the drawing wrong? They draw it like that but the return line doesn't intersect with it. It is from the Hayne's manual.
Here is the diagram, and a realistic scaled-drawing of the head and block, of the early F filtering in action. It pumps oil directly to the engine parts, after it controls the pressure at the location where it bifurcates:
And, specs if you are checking the F's regulator:
On the 2F, the...
Not interested in zinc, but, it is a good angle to consider, just not my approach. Also, I'm sticking with a gasoline engine oil, as it is engineered for modern fuel.
Multimeter will suffice. Photos please, post #19 already. Don't tell me that the analog needle is no good because there is still no data to compare it to. It isn't like I'm starting a technical conversation about what a tractor is and what a tractor isn't.
Change for heavy wheeling is three times per year, light wheeling is twice - I'm way more inspired to do a blend in March, and summer weight in May, than just a winter-summer - spring is a very inspired time to rack up miles.
5W, 10W are both straight-grade products, so I never considered them...
I have 5W-30 synth installed right now in my 2F engine. It is cold in the American Southwest. The '75 Land Cruiser Owner's Manual says to use 5W-20 for up to 50 deg. F. It won't get that warm until March, and I'm using a modern version of a heavier oil than the 5W-20 recommended. I could...
No, the Toyota filter ran for less than a half tank of gas with fresh 5W-30 then I swapped in the Delco one.
There are enormous differences on the outside of the filters, inlet hole size and number being the first variety of traits. All I care about is the amount/pressure of filtered or...
The 2F oiling relies on your choice of oil filter to do the pressure regulating, how easy is it to get oil thru the media or under the by-pass/anti-drain flap, etc. That makes the Thailand Denso 90915-YZZZD3 filter a highly questionable filter if I can install a filter from a 4-cylinder that is...
Let me reiterate. The basic inquiry was how can I optimize oil pressure?
I'm leaning toward fully synth for winter; so what about an oil filter? The original oil filer was enormous compared to the updated part (photos from web). The updated Toyota part, it is like half the volume of what is...
With Toyota filter:
with Delco filter, just ten minutes later, still in the 40 degree range outside: There is more black between the needle and the middle mark; with Delco filter the 2F has greater oil pressure. Both are measured at idle.
Use the fuel needle to compare perspective on the...