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After some digging and finding SDS sheets, this fuel is made by/for VP Racing and carries the VP Racing JASO FD certificate, using a full synthetic oil in the mix. Its composition is identical to the Powercare fuel you find at Home Depot, also from VP Racing. The VP Racing branded fuel (in the...

My infrequent use of two-cycle engines makes pre-mixed fuels attractive despite the price. I noticed this Supertech pre-mixed fuel, which is significantly less expensive than any other that I have found. True reviews of it are surprisingly difficult to find. The oil in it is JASO FD certified...

Another table I find easier to read (taken from a post in this forum, I don't recall who originally shared it)

Any help with finding the relevant section of this 383 page document?

Dug it back out of quadruple bagged and tied garbage...sorry, slightly out of focus at the sealing surface, in person it looks fine.

Second filter cut open today... 2005 Toyota Sienna with 150,101 miles on the vehicle, 6,573 miles on the oil and filter. Mix of driving, though >60% was on road trips, and I normally keep it under 75 MPH. Out/Off - STP synthetic 5W-30 (the shop put this oil in after replacing the valve cover...

I never imagined that I would actually be cutting filters open, but here I am... 2008 Honda Civic, 99,463 miles on the car, 7,504 miles on the oil and filter; mixed driving, mostly to work (21 mile RT) with some longer trips added in Out/Off- Mobil 1 5W-20 with 1 qt M1 EP 5W-20 (what I had on...

2005 Toyota Sienna owned since it was new, passed 150K a couple of weeks ago. After the original factory fill it was Mobil 1 until a couple of years ago when there was no M1 5W-30 on the shelf when I needed it, and got some PP, which I have used since then. I have some M1 EP on deck for the...

True, but that was a rectangle with a much, much smaller aspect ratio than the narrow slot. The flow characteristics of a narrow slot are different a generic rectangle.

The calculation was based on using a round orifice. A very high aspect ratio slot would have a much smaller hydraulic diameter, which would affect the results. Yes I have heard that joke before. Being an engineer, I have used that joke or similar to it a number of times. The way I have heard...

16% is likely a high number, as previously discussed. The math says that with 10% bypass (no way to know if this is a conservative or non-conservative bypass amount without a very involved calculation) in a 99% efficient filter, the particulate count going to the engine is 12.2% of the...

That is interesting - it gives conclusions that are contrary to first principles. What is the name of that paper and the authors? I'd like to see it. I might have access to it.

A function of the hydraulic diameter (4 x flow area / wetted perimeter), but probably not a simple relationship. Probably experimentally determined.

The rectangle is not defined, and given that it is not much different from a square, the aspect ratio is not very large. I maintain that a slot with a very large aspect ratio would have a very significantly different coefficient. All of this is fairly moot when it comes to determining the...

This is correct. However, this is not the point being discussed. See my post above.

Of course the flow through the leak path increases as the filter media loads, but this entire discussion has been about a calculated flow at a specific pressure drop. I pointed out that using an equivalent area round hole gives a higher flow than will actually occur in a rectangular slot with a...

My point exactly. Better yet, use a round pipe for the round hole rather than an orifice with a slight constriction. The orifice calculation probably uses a discharge coefficient of around 0.62, which probably won't amount to a lot if you only have a small constriction, but it will still be...

The flow field entering a constriction and exiting a constriction changes. For flow entering the constriction, the fluid accelerates. For flow exiting the constriction, the flow decelerates. This induces a pressure drop in addition to the pressure drop of flowing through the orifice itself. This...

The rectangular calculation is treating it as a section of pipe, not an orifice, and does not account for the constriction entering the narrow slot and the expansion leaving the narrow slot (i.e. what an orifice actually experiences). If the online calculator cannot do a rectangular orifice, for...

As I said, an accurate calculation would not be trivial. I don't have a good way to do it, at least in a reasonable amount of time. I merely pointed out that using an equivalent area round orifice overstates the flow, and probably more than just a little. The shape of the gap does play a large...