br8crumb

in the process of cleaning up the bay and getting everything sorted out prior to swapping the motor, but looking at a few different catch cans. i planned on using 2 10an off the valve cover and 2 10an off the back of the block + plugging pcv box.

looking at both cans pictured below in the links, how come the 2 bungs are at the very bottom of the can? is that supposed to be a drain back? i originally was assuming hook the valve cover lines up top and the 2 off the back of the block down low, but then remembered the block is not baffled, and oil will inevitably make it ways into the can... only to drain right back down the lines into the block. trying to avoid using a drain back...

GO-AUTOWORKS GT Series Oil Catch Can

https://sheepeybuilt.com/products/sh...iant=262805574

feel free to enlighten me on why the bungs are so low on the can? as to whether theres a specific reason or if its just used a drain back. thanks

2kdrift

Yup its for a drainback system you really wont see a catch can with 4 ports that is not a drainback system.

You could do 2 seperate catch cans if you really wanna use 4 ports however I dont see why you would, 2 10an ports is the standard, depends on your HP level.

I run 2 ports off my valve cover, with no drain back

Oil Catch Cans & Accessories

jalenda9

I'm curious about this as well. if I have an b18a1 shooting for 300-350 what would be the best way to route this? I see the 2 an fittings on valvecovers of engines with vtec more so than on ls heads.

2kdrift

the way I understand it is, back of block will suck up more oil compared to a baffled Valve cover setup

-not much of an issue if you run a drainback system, alot of people are against drainbacks tho, I dont see them as being too bad basically that mosture in the can will burn off once the motor is warmed up.

I just did a VC non drainback just to be done with it, Im happy with the results I used a kit from the link I provided earlier, I did need to add a baffle to the rear of the VC due to my Ram Horn

br8crumb

So if looking at the sheepey can, the bottom 2 out of the 4 are both drains? I find that hard to believe. I really assumed both of those were ment to go to the back of the block and the top 2 to the valve cover. Drain backs typically always go to the oil pan

br8crumb

Honestly the more I think about it 10an off the block compared to prelude fittings should not have enough vac to draw oil if low Street boost

2kdrift

you are correct however once the can accumulates enuff oil the oil will be drained into the back of the block

br8crumb

Any issues with oil returning to the back of the block instead of a traditional return line to the oil pan?

VegaS10

No.

2kdrift

why would there be? take a look at a b series block there are 2 "valleys" which drain oil from the head back to the block (the fittings are in this "valley") so the catch can oil drains to the oil pan through this valley just as it does from your head

I honestly have never seen any honda with a catch can drain going directly to the pan, the back of block fittings are the tried and true drain system