I was under the impression fleetguard filters were the best for these. Thanks for the infoFF5814 would be the best secondary filter, followed by the FF5320. Both of those have Donaldson crosses that are just as good, or better, and cheaper. DBF5814 would be my choice.
For the f/w sep the Baldwin BF1212 is hard to beat, and better than the Fleetguard equivalent.
I was under the impression fleetguard filters were the best for these. Thanks for the info
What about the oil filter?Fleetguard filters are good filters, but there are better for nearly every application on the older stuff and aftermarket stuff.
What about the oil filter?
Donaldson DBL7349 is the best option we can get.
Donaldson DBL7349 is the best option we can get.
I disagree. The Fleetguard lf9028 filter is reported to filter down to 2 microns. I use them for my extended drains. New filter every 15,000 miles after an oil analysis and oil change at 30,000 with an oil analysis. My oil analysis results are always excellent. I once went to 43,000 miles but the soot level went above 0.1% which is probably not harmful but sort of bugged me. All other elements were well withing spec.
Better than the current AMZ/OIL filter?
LF9028's full flow portion is rated 100% at 30µ, 98.7% at 25µ, and the bypass portion is rated 95% at 5µ. The bypass portion is only getting 5% of the oil at a given time.
The DBL7349 is 100% at 20µ, 98.7% at 15µ, and 60% at 7µ.
Then there is flow rating to consider. The oil pump is rated for 20.5 GPM at 4200 rpms, which is above where we drive but that's how it's spec'd. The Donaldson is rated for 20 GPM and the Fleetguard LF9028 is only rated for 8.72 GPM.
That is how bypass filtration systems work, be they two filters or the lf9028. Only a small portion gets routed to the bypass. Over a period of time all the oil in the system is filtered to two microns.
Flow percentages mean little to me. What are the micron filtration ratings of the Donaldson and the full flow portion of the 9028? I have a feeling they are the same, and also the same as the Fleetguard lf16035.
Most bypass filters get about 10% of the oil, and have a lot more media. The LF9028 get's 1/2 that oil at any given time and has a LOT less media.
The bypass filters I've ran in the past are absolute (98.7%) at 2µ, where the bypass discs on the LF9028 are 95% at 2µ.
The LF9028 is a good theory, but it's an undersized full flow element with a very undersized and underperforming bypass element.
Flow is not a percent, it's gallons per minute. The LF9028 doesn't have the flow to support the oil pumps rated capacity, but neither does the LF16035. It's not normally an issue at cruise rpms, but I imagine the filter might create enough psid to open the filter bypass at higher rpms.
Micron ratings are posted above, but they are not the same.
The LF16035/LF9028 full flow is 100% at 30µ and absolute (98.7%) at 25µ.
The DBL7349 is 100% at 20µ, and absolute at 15µ.
Everything you have stated shows the lf9028 filters to a lower micron rating that the Donaldson. Who cares if only 10 or even 5 percent of the oil is in the bypass portion at any given time? The point is ALL the oil eventually flows through a two micron filter. Flow gpm, IMO, is not a factor during normal operation. But if someone can provide an oil analysis after 15,000 miles using the Donaldson showing the same or better results I could be persuaded to change. The lf9028 is starting to get expensive because of it's increasing popularity.
It's not a 2µ filter, why do you keep calling it that?
.... the bypass discs on the LF9028 are 95% at 2µ.
500,000 miles using this filter doesn't pass the sniff test? What does?
When you consider the overdriven ratio of the oil pump then 4200 rpms isn't all that fast. I'm trying to find the ratio of engine rpms to oil pump rpms.
EDIT: 24 teeth on the oil pump drive gear and 36 on the crank, for a gear ratio of .667. So the engine only has to be turning 2800 to get 20 GPM. At 2000 engine rpms the oil pump is turning 3000 rpms.
Fun discussion.
I'm not arguing the pump isn't capable of that much volume but the restrictions of the engine would not permit that much flow. In reality, how many gallons per minute do you think the filter actually sees at 2000 rpm? I sincerely doubt it is anywhere near twice the oil capacity of the engine and certainly not seven times.
Counting the teeth on the crank gear (42), idler gear (22), and oil pump gear (24), the ratio is 1.75:1. Engine at 1K RPM, oil pump is turning 1,750 RPM.