When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
So I started my turbo build with a BWs475 on my silverado with Lq4 and the guy helping me told me I dont need a catch can and just put breathers on both valve covers and block off my intake and throttle body vacuum lines.
Will this work or do I need to add lines to turbo and catch cans? I searched and coming up short on this topic.
I've never ran a catch can on any of my turbo setups and just vented the valve covers with breathers and have never had any problems doing this. I'm no expert on this matter though, just what I have done all the time. You will get oil smell every now and then doing this though.
I have had the exhaust evac forever. Can't beat it IMO. Clean and not some hose monster bs under the hood, zero smell of blow by, no catch cans, no pressure problems
I wonder how this setup would do with an engine with a lot of crankcase pressure. I would think with that kind of venting you would be looking at a bit of oil being released into the exhaust.
Something else to consider also with this is that it would need to be ran behind any oxygen sensors or wideband O2 sensors as it would alter their reading and or possibly foul them.
Breathers are good up to an extent, but if excessive crankcase pressure is present, I think a good catch can system is needed.
I wonder how this setup would do with an engine with a lot of crankcase pressure. I would think with that kind of venting you would be looking at a bit of oil being released into the exhaust. Something else to consider also with this is that it would need to be ran behind any oxygen sensors or wideband O2 sensors as it would alter their reading and or possibly foul them. Breathers are good up to an extent, but if excessive crankcase pressure is present, I think a good catch can system is needed.
Did you read the thread? He mentioned all of this. I fail to see how a catch can could be any better than using the vaccum your exhuast creates to suck and dump all pressure/vapors into the exhuast? It's literally doing the same thing just burning them instead of collecting it.
I wonder how this setup would do with an engine with a lot of crankcase pressure. I would think with that kind of venting you would be looking at a bit of oil being released into the exhaust.
Something else to consider also with this is that it would need to be ran behind any oxygen sensors or wideband O2 sensors as it would alter their reading and or possibly foul them.
Breathers are good up to an extent, but if excessive crankcase pressure is present, I think a good catch can system is needed.
My motor moved a ton of gas. Motor seals stayed completely dry for years
It is introduced into the exhaust after the wb02.
I added baffles in the valve covers, no speckling on bumper by exhaust after that
probably some people don't like the smell of oil burning off their pride and joy.
if i was to dump to exhaust i would still have a catch can in-line. there is nothing magical about the vac the exhaust creates that keeps oil from carrying over, and anyone that drag races would appreciate it not being left behind your car.
furthermore when the exhaust pressure builds enough to equalize the system, then where does your blowby go? my can would fix that too, especially on a muffled car
Oscs if you bought your can recently why don't you contact me with questions or request a return if unsatisfied, I'd be happy to help.
on tech there is a big divide between what you should do and what you can get away with. if you daily drive the car, or put 250 miles on it a year is ALWAYS left out yet critical. there is a good solution for every application, just gotta find what is right for you.
Did you read the thread? He mentioned all of this. I fail to see how a catch can could be any better than using the vaccum your exhuast creates to suck and dump all pressure/vapors into the exhuast? It's literally doing the same thing just burning them instead of collecting it.
Yes I did read it. Did you? Cause no where in this thread did I read anything about excessive crankcase pressure with dumping it into the exhaust and if there was any smoke as a result.
Not to be a jerk, but that's the question I was asking, and would like to get the answer to. I can see for normal usage it would be fine, but in a motor with lots of crankcase pressure where it actually will be venting a decent amount of oil into the exhaust it would be nice to know if it smokes or not. The way I see it, it would have to. I would just like to know how much.
probably some people don't like the smell of oil burning off their pride and joy. if i was to dump to exhaust i would still have a catch can in-line. there is nothing magical about the vac the exhaust creates that keeps oil from carrying over, and anyone that drag races would appreciate it not being left behind your car. furthermore when the exhaust pressure builds enough to equalize the system, then where does your blowby go? my can would fix that too, especially on a muffled car Oscs if you bought your can recently why don't you contact me with questions or request a return if unsatisfied, I'd be happy to help. on tech there is a big divide between what you should do and what you can get away with. if you daily drive the car, or put 250 miles on it a year is ALWAYS left out yet critical. there is a good solution for every application, just gotta find what is right for you.
It's not that I'm unsatisfied with your can i just think there are other options to a catch can. You mention the pressures equalizing. I see where that could be a problem while cruising on the street at certain RPMs etc. it's just that I see tons of turbos guys that are happy with the exhuast vent setup. It's just simpler and I never hear complaints. Also when I first purchased your can and had questions about setting it up to clear the CC while in boost I did email you, several times with the same question and I did not receive a response. In no way was this an attempt to discredit your can as it is a solid piece. I've just seen the exhuast evac system work really well.
Yes I did read it. Did you? Cause no where in this thread did I read anything about excessive crankcase pressure with dumping it into the exhaust and if there was any smoke as a result. Not to be a jerk, but that's the question I was asking, and would like to get the answer to. I can see for normal usage it would be fine, but in a motor with lots of crankcase pressure where it actually will be venting a decent amount of oil into the exhaust it would be nice to know if it smokes or not. The way I see it, it would have to. I would just like to know how much.
How many big power twin turbo motors have you seen with the correct gapping that don't have a fair amount of CC pressure. It is an issue that any properly setup turbo car needs to address IMO. I figured a decent amount of CC pressure was obvious hince the reason the guy moved away from the Catch can in the first place. If you read the thread he clearly says to place the valve AFTER any O2 or wideband sensor. As far as it smoking or not goes, no it should never smoke. If you have good baffling like rotary than there should never be large quantities of oil just being dumped into your exhuast. Lets not forget it's pressure you are trying to relieve not relocating your oil. Do diligence in keeping our oil where it belongs and you'll be fine.
probably some people don't like the smell of oil burning off their pride and joy.
if i was to dump to exhaust i would still have a catch can in-line. there is nothing magical about the vac the exhaust creates that keeps oil from carrying over, and anyone that drag races would appreciate it not being left behind your car.
furthermore when the exhaust pressure builds enough to equalize the system, then where does your blowby go? my can would fix that too, especially on a muffled car
Oscs if you bought your can recently why don't you contact me with questions or request a return if unsatisfied, I'd be happy to help.
on tech there is a big divide between what you should do and what you can get away with. if you daily drive the car, or put 250 miles on it a year is ALWAYS left out yet critical. there is a good solution for every application, just gotta find what is right for you.
Thanks for chiming in David. This was the information I was looking for that the thread was missing.
I don't want to smell burning oil, or belching it out of my tailpipes. I'll stick to the idea of a catch can.
How many big power twin turbo motors have you seen with the correct gapping that don't have a fair amount of CC pressure. It is an issue that any properly setup turbo car needs to address IMO. I figured a decent amount of CC pressure was obvious hince the reason the guy moved away from the Catch can in the first place. If you read the thread he clearly says to place the valve AFTER any O2 or wideband sensor. As far as it smoking or not goes, no it should never smoke. If you have good baffling like rotary than there should never be large quantities of oil just being dumped into your exhuast. Lets not forget it's pressure you are trying to relieve not relocating your oil. Do diligence in keeping our oil where it belongs and you'll be fine.
My point was that it was never addressed if there would be oil dumped in your exhaust or not. Never if venting was needed (all semantics at this point).
My valve cover has a bung welded to it for a catch can. How would I install a baffle? I don't know that there is room (at least in my particular setup as I have shaft mount rockers that are huge and there is little clearance under the valve cover). I like the idea of not having a catch can, I just don't want to smell burning oil, or have the excess come out my tail pipes.
My point was that it was never addressed if there would be oil dumped in your exhaust or not. Never if venting was needed (all semantics at this point). My valve cover has a bung welded to it for a catch can. How would I install a baffle? I don't know that there is room (at least in my particular setup as I have shaft mount rockers that are huge and there is little clearance under the valve cover). I like the idea of not having a catch can, I just don't want to smell burning oil, or have the excess come out my tail pipes.
I hear you man. If you look back a few posts another member posted a picture of what he did. I'm not sure what your valve train consists of but regardless of what evac system you choose you need to have some type of baffling system to prevent oil from being sucked either into your catch can or being dumped into your exhuast. I've seen a few member on here that have filled their cans in less than 300 miles becuase they did the same thing you did. They welded bungs with out baffles in a spot that was susceptible to splash/pick up.
It's not that I'm unsatisfied with your can i just think there are other options to a catch can. You mention the pressures equalizing. I see where that could be a problem while cruising on the street at certain RPMs etc. it's just that I see tons of turbos guys that are happy with the exhuast vent setup. It's just simpler and I never hear complaints. Also when I first purchased your can and had questions about setting it up to clear the CC while in boost I did email you, several times with the same question and I did not receive a response. In no way was this an attempt to discredit your can as it is a solid piece. I've just seen the exhuast evac system work really well.
there are lots of people that are happy with lots of different things, that's what makes the world go round.
some people want the benefits or legality that a pcv system provides, some don't care, or just have other priorities.
I side with all of the OEM's that if at all possible it should be kept to extend oil and engine life.
I looked for emails and could not find, sorry for the delay but I would be happy to answer any questions you have anytime. mightymousesolutions@gmail.com
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
X2.. 
Catch can or Not? 
