Search results

I can think of a few reasons why a oiling system might be designed this way. An engine will require a certain minimum oil pressure regardless of engine rpm, for hydraulic devices like VVT components or chain tensioners. The figure below provides a good example of oil pressure requirements of...

Your particle counts went up by 9 to 10 ISO codes for particles between 4 and 14 microns. That's around 1,000 times more particles than your previous runs. The high particle count might be due to advanced wear or really poor oil filtration. If it were from dust, I think the silicon would be...

That part of the curve is linear, but the curve as a whole from zero rpm is not. This is true regardless of what the shape of the curve from 0-500 rpm actually looks like. There has to be a knee-point there even if we can't see the exact details of it. At high rpm, the flow could be levelling...

The curve is shaped that way because the oil pump is in pressure relief above 800 rpm, but isn't in pressure relief below 500 rpm. This sharp knee-point in the curve is where pressure relief starts occurring. Here are some flow curves from Melling for some oil pumps for GM V-8's. These flow...

The WIX XP in that test was defective and bypassing over 10% of the oil flow, which is why its efficiency capped at under 90%. If not for the defect it would have been similar to the Purolator BOSS, 99% at ~35 micron. There is some truth to that. The WIX XP is one of the least restrictive...

The data points were taken from the engine running in neutral. The pressure sensor was downstream of the oil pump, after the oil filter. The 315 kPA / 46 psi value for the relief pressure is not the actual pressure relief valve opening pressure, but the gallery pressure at which the relief...

This OG Ultra doesn't look nearly as bad as some other rusty FRAMs from the last few years: FRAM Ultra FRAM Toughguard FRAM Titanium

Don't throw them out. The next time you're at an auto parts store, look for the nearest old beater Honda in the parking lot, leave them a gift from the filter fairy under their windshield wiper, then go get some OEM Subaru filters.

It's an engine from a ~2012 Australian Ford Falcon. The study is titled Fuel conservation and emission reduction through novel waste heat recovery for internal combustion engines. I added the annotation for the relief pressure setting. It was taken from this chart provided in the same study...

Yeah, but it should be similar. Another quirk of these engines is that oil will continue to drain from the engine for a long while after the engine is shut off. Even the oil in the oil filter will mostly drain out through the bearings even though it has an anti-drainback valve. So, if you...

1. These engines (at least the FA20DIT) spec 5.1 L with a filter change, 4.9 L without a filter change. Total oil capacity is 6.0 L with an engine rebuild, so there will around 1 L of used oil left in the engine either way. The difference is nothing to worry about, especially with your short...

Fuel dilution usually reaches steady state within ~1k miles, so changing the oil more often doesn't really help with that. It's just something you have to live with. You can address the reduced viscosity by going up to a 5W-30 if you want. Taking longer trips and using a block heater in cold...

I think it's quite common. Here's an example of a Ford inline-6 engine with an oil pump that is always in pressure relief above 1,500 rpm, even when the oil is at 120°C. A lot of engines seem to have a pressure-rpm curve like this. With a PD pump that isn't in relief, oil pressure and flow...

In theory, more detergents might result in more friction, but I'm sure HPL uses a healthy dose of friction modifier to compensate for this. There's also a phenomenon where calcium and magnesium detergents can form crystals that clog oil screens and filters, if an engine is left to sit without...

Yes, I think the rings are the most sensitive to thin oil because of the high temperature of the oil film at the top ring. I've read that the temperature of this oil film tends to rise to a temperature somewhere between that of the piston ring and that of the liner, as heat transfers from the...

They mention that maximum shear rates in bearings an order of magnitude higher than the HTHS measurement, or around 10^7/sec, but I've seen other studies estimate maximum shear rates in bearings at only 2 x 10^6, a lot closer to HTHS. I've also seen data showing a very strong correlation...

Which other codes? Did you initially have the misfire code for the even cylinders or is that something new? Did any codes not come back? I think you have the bank and cylinder definitions right. The VVT system uses inputs from the coolant and oil temperature sensors, so I'd check the...

It will be different for every engine, but generally much hotter than 220°F. For the engine in the study I posted, bearing wear only started increasing with a sump temperature of 150°C (300°F), with oil thinner than an xW-20. In another study, piston ring wear doubled with oil grades thinner...

The dark circles are monogrades. The lighter shapes are multigrades that use different types of VII. The same additive package was used for all oils except for one of the multigrades. Effect of Oil Rheology on Journal Bearing Performance: Part 4 - Bearing Durability and Oil Film Thickness 892154

It won't be a lot of current. A discharged battery will charge at around C/5 at 12.6 volts. For a 60 Ah battery, that's 12 amps. The voltage won't be as high as 12.6 volts either, since the voltage of the charged battery will drop under load, so it'll probably only be a few amps.