Anyone done return to sump from catch tank ?

[Hoofa]

Just fitted a mishimoto catch tank, looks good and would like to do return to sump, how have other people done this ?,Weld a boss to the sump on or use the sump plug hole with a adapter ?

Plumbed the catch tank back to pre supercharger inlet in a bid to reduce all the leaking on rocker covers and sump due to over pressure

Cheers

[Pupp]

Might be an idea to do a few miles and see what is being caught before reintroducing it to the engine... I've rarely seen anything in a breather tank I'd want to tip back in my motor....

[wadsapple]

On my dry sump system. Vented from rocker covers after a boss fitted 19jic if I remember right. Then from there to catch tank , from there to a return boss on the sump pan via a pump. I guess you want it gravity fed ,not sure if that will work. You would need a reply from an engineer I think to answer if gravity would work. Once you relieve the pressure into a catch tank why do you think it would pump oil into the catch tank.

[phazed]

It sounds like the rockers can't breath.

I'm no expert but it sounds like you need both rockers taken to a catch tank, an outlet from the catch tank to the induction system somewhere, (small diameter) for vacuum to exhaust the rockers and a small breather from the engine, (top of timing cover maybe) to introduce a little air.

[QBee]

I am reading this during a coffee break, and thinking "if you are driving along and the engine oil pressure is at say 50psi, how will a gravity fed return to sump at atmospheric pressure actually force the oil back into the sump? Will there not be a fantastic fountain from the catch tank onto the hot exhaust, and Hoofa laying smoke as he churns down the quiet Fen roads?
And if you put a pump into the system, won't is be pumping air into the sump after a few seconds, unless there is some sort of auto switch off?"

Obviously I am missing something and need to get back to the 36 column spreadsheet I have been working on all week

[TimJM]

The sump shouldn't be pressurized.

[spend]

Pupp said:

Might be an idea to do a few miles and see what is being caught before reintroducing it to the engine... I've rarely seen anything in a breather tank I'd want to tip back in my motor....

Thats sensible advice, if you do want to return to sump, can be dropped into timing cover, just put a check valve in line so if any PCV sucking happens its 'checked'

QBee seems to be confusing pressurized oil delivery (dry sump) and ventilation

The account of dry sump seems rather strange also? normally you would use one stage of the dry sump pump to evacuate the crankcase into the oil reservoir in place of any PCV (in parallel with the the other stages pumping returning oil out of the bottom of the sump) AFIK.

[sapper]

I have a boss welded to the sump, ill get some pictures if you wish.

[Bluebottle]

QBee said:

I am reading this during a coffee break, and thinking "if you are driving along and the engine oil pressure is at say 50psi, how will a gravity fed return to sump at atmospheric pressure actually force the oil back into the sump? Will there not be a fantastic fountain from the catch tank onto the hot exhaust, and Hoofa laying smoke as he churns down the quiet Fen roads?
And if you put a pump into the system, won't is be pumping air into the sump after a few seconds, unless there is some sort of auto switch off?"

Obviously I am missing something and need to get back to the 36 column spreadsheet I have been working on all week

The oil pump pressurises the oil galleries, not the sump ...however, I would have thought crank case pressure would prevent a gravity feed back into the sump from working?

[spend]

sapper said:

I have a boss welded to the sump, ill get some pictures if you wish.

I'd guess that is to return pressurized oil flow (through the turbos) ~ not at all the same as catch tank.

[QBee]

Thanks guys - you have added to my knowledge.

This is why things below the bonnet line are taken care of by Mr Mathew Smith, TVR expert of my acquaintance.
He is fitting my new baffled and enlarged sump as I type, and filling it with loads of litres of the finest Shell lubricant.

[Else]

I wont be returning the stuff my catch tank collects to sump. At the moment it drips out below the car and it looks like a milky sludgy mess on my garage floor. My solution is to purge all crankcase air and fluids into the exhaust via a non return valve and special angle boss which creates a vacuum using passing exhaust gases. Haven't fitted it as yet, watch this space

[Pupp]

Bluebottle said:

QBee said:

I am reading this during a coffee break, and thinking "if you are driving along and the engine oil pressure is at say 50psi, how will a gravity fed return to sump at atmospheric pressure actually force the oil back into the sump? Will there not be a fantastic fountain from the catch tank onto the hot exhaust, and Hoofa laying smoke as he churns down the quiet Fen roads?
And if you put a pump into the system, won't is be pumping air into the sump after a few seconds, unless there is some sort of auto switch off?"

Obviously I am missing something and need to get back to the 36 column spreadsheet I have been working on all week

The oil pump pressurises the oil galleries, not the sump ...however, I would have thought crank case pressure would prevent a gravity feed back into the sump from working?

Sincerely hope not on behalf of the turbo crew

My point was that whatever was condensing in the tank was likely to be evaporates other than oil (ie water, combustion blow-by products etc...) and if oil is getting through in significant quantities then there is probably some physical barrier that would be of better effect...

[sapper]

spend said:

I'd guess that is to return pressurized oil flow (through the turbos) ~ not at all the same as catch tank.

I know, but welding a boss, is the same regardsless of what its used for.