Proposed Oil Catch Can Setup...

[Apex_in_sno]

Any thoughts on this setup?
Trying to make a setup with only one catch can, and also eliminate blowby entering into the intake via the crank vent at low vacuum situations.

[shay2nak]

are you aware there is a catch can available for the Lotus?

[Bane]

Yep... there already is a very well defined Lotus-specific kit available:

Lotus Products Page

^ Link

[Apex_in_sno]

Originally Posted by Bane

Yep... there already is a very well defined Lotus-specific kit available:

Lotus Products Page

^ Link

Yup, I do know about them (and Lotus Sport now sells them to), and they look great, but don't want to wait the time and don't want to install in the kit location, and I don't want two of them...

[Bane]

There are two for a reason... The designer knows his stuff when it comes to catch cans. I know him personally and his attention to detail is unrivaled.

The 2ZZ has a really weird PCV system with different sized hoses running around. I give you props for trying it yourself. We were just trying to help and make it easier for you

[Monsi]

Originally Posted by Bane

There are two for a reason... The designer knows his stuff when it comes to catch cans. I know him personally and his attention to detail is unrivaled.

The 2ZZ has a really weird PCV system with different sized hoses running around. I give you props for trying it yourself. We were just trying to help and make it easier for you

the hoses are all the same size... its just stretched onto and oversized nipple on top of the TB

I put in a catch can that just vents to atmosphere as I don't like exhaust gasses contaminating my intake tract

[Demonized]

Originally Posted by Monsi

exhaust gasses contaminating my intake tract

Oil*

[gpheck]

search saikomichi.. they make a great catchcan kit for our cars

[Monsi]

Originally Posted by Demonized

Oil*

a catch can takes out the oil... you still have hot exhaust gasses feeding into the intake tho

[Eyelise]

I have pics of the saikomichi set-up in my thread. As far as the gasses go, these are vented from the valve cover not the exhaust system in case anyone not familiar with the set-up is reading this thread.

Originally Posted by Monsi

a catch can takes out the oil... you still have hot exhaust gasses feeding into the intake tho

[Demonized]

Originally Posted by Monsi

the hoses are all the same size... its just stretched onto and oversized nipple on top of the TB

I put in a catch can that just vents to atmosphere as I don't like exhaust gasses contaminating my intake tract

I don't understand?... Maybe you're talking about the Exhaust Gas Recirculation system(EGR)?

[Eyelise]

The reasoning behind the OOC is to eliminate the octane reducing effects of the oil mixing with the intake charge.

[Monsi]

blow by gasses are exhaust gasses that slip past the rings into the crank case, which is why you need a PCV in the first place, and since its devoid of oxygen, putting it into the intake is displacing air that would actually be doing something in the engine, and I'd rather it didn't

[Eyelise]

So if I understand correctly, blow-by pressurizes the crankcase which then increases the pressure under the valve cover which releases the pressure thru the PCV valve back to the throttle body. I can see why you don't want any of those gases contributing to the intake but just how much are we talking about? Does it really affect the oxygen lvl in the intake? If you vent to atmosphere, which I understand is how most race applications do it, what happens to the oil carried in the gases? It would soak any filter pretty darn quick. Maybe a solution is venting the "clean" ends of the OOC to atmosphere and emptying the cans once a month. Anyway the oil carried by the gases is what has ruined charge coolers, collects in SCs, and lowers octane.

Originally Posted by Monsi

blow by gasses are exhaust gasses that slip past the rings into the crank case, which is why you need a PCV in the first place, and since its devoid of oxygen, putting it into the intake is displacing air that would actually be doing something in the engine, and I'd rather it didn't

[Monsi]

Originally Posted by Eyelise

So if I understand correctly, blow-by pressurizes the crankcase which then increases the pressure under the valve cover which releases the pressure thru the PCV valve back to the throttle body. I can see why you don't want any of those gases contributing to the intake but just how much are we talking about? Does it really affect the oxygen lvl in the intake? If you vent to atmosphere, which I understand is how most race applications do it, what happens to the oil carried in the gases? It would soak any filter pretty darn quick. Maybe a solution is venting the "clean" ends of the OOC to atmosphere and emptying the cans once a month.

thats what I have, pcv-> OCC-> air and just capped the nipples on the throttle body

just about all cars used to be this way, even with a catch can there is still gonna be some oil getting in, and since we have a less than ideal IC setup to begin with a little oil is still unacceptable to me

[vao4v]

thats what I have, pcv-> OCC-> air and just capped the nipples on the throttle body.

Can you show pics of the TB and CC installation?

Thanks!

[Monsi]

Originally Posted by vao4v

Can you show pics of the TB and CC installation?

Thanks!

I will take a picture of it when I get the chance but be warned... I am not afraid of using zip ties

another thought on all of this... even if the exhaust gasses don't really displace much oxygen and you get all the oil out, they are still very hot, and taking hot gas and compressing it makes it even hotter and my biggest battle atm is getting my IATs down so every bit helps

[HKFEVER]

Originally Posted by Monsi

thats what I have, pcv-> OCC-> air and just capped the nipples on the throttle body

just about all cars used to be this way, even with a catch can there is still gonna be some oil getting in, and since we have a less than ideal IC setup to begin with a little oil is still unacceptable to me

This is the Lotus Sport's previous catch can does, vent the blow by gas and not back to the throttle body.

But not sure way they have the new version that is close circle.

[TimMullen]

Just in case no one realises it, those gases that people are wanting to "vent" are actually "pollution". Routing that small amount of gas into the intake to burn it makes your engine run "cleaner". Back in the old days, the gases were just vented to a pipe that extended down the side of engines to let the fumes out under the car (and the oil drip onto the road). The very first "pollution control" devices were the PCV valves that recycled the gases and reduced the pollution output of engines.

As far as pollution control devices, the PCV is the most benign, and actually probably helps the engine as it reduces the pressure in the crank case.

The amount of gases going into the engine isn't really going to affect the running of your engine. The oil fumes is not good for intercoolers, but the catch can can separate the oil, and you can burn the rest of the gases.

Of course, if you don't care about the pollution, then feel free to vent it to the air...

[turbophil]

The PCV valve itself doesn't do much if anything to evaculate crankcase pressure when the *majority* of the blowby/crankcase pressure is present-->ie under load/open throttle... Unless you have an engine that creates vacuum at WOT... It's the vent side of the PCV system that allows for proper crackcase venting underload. Venting is the only way short of a vacuum pump (or maybe a drysump that draws huge vacuum) to relieve the "real" crankcase pressure (the kind generated under load). Whether you choose to vent those trash gasses to the intake track or the environment is up to you... Not sure of any race cars that vent that trash to the intake track though... Not sure why we -"track go'ers"- should either??? Unless ALL the oil is extracted from the gasses, it's pretty tough deal with...

Cheers,

Phil