Cylinder head oil scavenging pump

Different problems. The problem with the tacoma is mostly oil pooling and flowing into the breather, not oil starvation.

 

97% of Tacoma owners are unwittingly following this advice.

 

^55% actually, according to Mike Sweers.

 

Yup, I actually have an Accusump sitting on the shelf... good stuff. As @Silverlogic mentions, until we remove the oil from the heads and return it to the sump, it won't solve the major issue.

 

Ya, you mentioned oil starvation as a worst case scenario in your original post so I thought I’d suggest the Accusump.
Considering that 0W20 flows like water, is there no simple way to install a gravity return line going from the back of the valve cover to the sump? And maybe a catch can on the PCV side?

 

As the oil fills the heads, and doesn't drain back, the level in the sump drops... easy enough. But... It then drops enough that the low oil level warning pops up on the dash.... that's if the engine hasn't already downed a gulp of oil large enough to lock it up. It wouldn't be a reach to expect in some situations that oil pressure is compromised. The accusump would take over here, but ultimately could cause the initial problem of oil ingestion to be even worse as the freshly inserted volume of extra oil pools in the head.

Catch cans do help. Some guys on here think a gravity drain will do the trick.... they may very well be correct. It will still require some of the work I'm performing here. But what the hell, in for a penny, in for a pound.

 

Do you happen to have any pictures of the rear of this head? Possibly with the valve cover off as well? To be able to tell is a threaded AN bung could be tapped in/welded on?

 

Yes, in this pic, upper left corner of the head is the rear most low point.


Looking from the backside, where the 7GR is cast could work. Or maybe one the bosses or nubs...

 

I think it would look good there. Do I see a ’Jowett Performance Anti-Head-Pooling, Hard Line, Gravity Drain Back Kit’ for sale in the future? (the name might need some work though. Lol)

 

That could work well. Time for prototype testing.

 

Lol... Anything is possible, I am willing, but given the intrusive requirements for install, it might be a slow seller. Heck, after the last 2 years, I'm just gearing up to reintroduce the billet oil filter cap.

Yes, prototyping time.

 

NEVR give up.

 

Whats the valve cover itself look like in that area? Id figured one would want to do this on the exhaust port side of the head or in / around that area on the valve cover so you wouldnt have to remove the head / motor to simply drill n tap a hole.

 

In the photo above, the upper left is actually the exhaust port side. I'll admit, it is a weird angle for the pic... from the middle of the engine looking out.

The valve covers are the fiber reinforced nylon plastic, and a bit of a nightmare. The breather, which is a large part of the original problem, is directly above the ideal location... this pic is from the same view as above.


They also have the camshaft oil spray bar incorporated into them. The spray bar can be eliminated and cam lobe spray can be taken care of by using 2UR-GSE cam followers/rocker arms, which have spray jets... but cost, cam removal, and we still don't have the right spot.

 

Wouldn't a catch can with a drain to the pan be by far the most simple solution? IF there is oil pulled into the breather the catch can will prevent it from getting into the engine which is the main concern. A drain to pan system is common and should then also prevent oil starvation.

A mechanical system will always be operational and introduces immense complexity and wear related issues. Being it runs all the time now it also creates potential issues when NOT wheeling

Electric is a much more simple solution if force operation is used and could include tilt sensors, themselves very cheap and simple, or it could just be a switch that is operated when off roading. It shouldn't be necessary to move a high volume, just to keep it from collecting. In that case a simple motor and small piping would be enough. Even if run continuously while wheeling it would still be operated less than a mechanical system and it would likely require less power to boot.

 

A catch-can with a drain to the pan is unfeasable as it would defeat the function of the PCV valve, and oil would be sucked up outta the pan, through the catch-can drain, by the intake vacuum.

 

It is not uncommon to incorporate an oil separator into the system and drain the separted oil back into the crankcase.

BMW includes this from the factory.
https://www.e46fanatics.com/threads/oil-separator.819307/

 

like most of their solutions it looks over complicated.

 

Maybe, although I would argue that a mechanically driven secondary oil pump who's whole purpose is to move oil from the head back to the pan is even more complicate

 

agreed i wouldnt think mechanical would provide an easy solution. maybe electrical would be better suited for a retrofit.