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Danny, agree. That's what I've got, sort of. It's a CB thinline sump that didn't come with the central drain plug, but that we added a drain plug to later. Works a treat. No need to touch the eight nuts or washers when changing oil.
But the OP is suggesting installing something like this (this is the CB thinline version), with a filter inside the sump:
![CBFilterSump CBFilterSump](https://www.speedsterowners.com/fileSendAction/fcType/0/fcOid/720788141579469560/filePointer/720928879344743454/fodoid/720928879344743448/imageType/MEDIUM/inlineImage/true/CBFilterSump.jpg)
Even if you add a drainplug, there's no way to change the filter without pulling all of the acorn nuts and washers. And the filter looks tiny compared to a regular one, so can't be doing as good a job.
Nother thing: wouldn't the oil pump be pulling against an increasingly restricted inlet as the filter loads up with dirt?
For the 'convenience' of not installing a normal filter, you seem to have added some major headaches down the road.
Am I missing something? Discuss.
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That ENTIRE arrangement in the picture above was on my engine when I got it. It was also full-flowed and REQUIRED an external fan. The 911 fan/shroud combo has no room for a cooler under it, so aftermarket/external is the only way to go.
Do you see the piece next to the spring in the foreground of the strainer/filter? That is a very lightly loaded spring/ball check valve IN CASE the filter is clogged. So, your engine won't starve of oil, it will just suck dirty oil. But, for any of it to work as intended, the entire sump needs to be full of oil AT ALL TIMES. Don't run your oil level low like some do if you have this filter/sump. Please.
It was also REQUIRED by my engine builder for warranty that I use an external filter. So that's what I did.
At the first change I noted that screen thing in there and cleaned it. After a few changes I decided that it was stupid to deal with and stupid to have two filters. After all, 100% of the oil goes through the external fine-filtering Wix. No need for a screen of any kind in the sump.
It is a pain in the butt to stack all those parts up, and hold all that in place while you line up a gasket, the plate, and then try to thread a couple nuts on.
I HATED changing the oil. So, I JB-welded a pickup tube extension on, securing it with a hose clamp, and making a piece that exerted spring pressure upwards on the pickup extension so it was impossible for it to slide down or come off.
At the same time, I milled a flat area where it says Claudes Buggies and drilled and tapped that for a drain plug.
Boy, did oil changes become much easier. And I slept better too.
Then I removed the whole darn thing and installed the dry sump system.