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Breather Tanks....Are they necessary??

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Old 02-13-2018, 05:02 PM
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Default Breather Tanks....Are they necessary??

Tried searching around on the forum, but i haven't found much info..

Now my question is, are Breather Tanks like the LMR really necassary?

Seeing a lot of threads on Catch Cans..but what's the deal with a breather tank?

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Old 02-13-2018, 06:34 PM
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Originally Posted by prince8619 View Post
Tried searching around on the forum, but i haven't found much info..

Now my question is, are Breather Tanks like the LMR really necassary?

Seeing a lot of threads on Catch Cans..but what's the deal with a breather tank?
I have an LMR. I feel they are necessary for boosted applications. I had a catch can previously and it used to catch a lot due to how hard I push the car. For me, the breather tank keeps my motor happy.

Ant
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Old 02-13-2018, 06:43 PM
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Originally Posted by FYREANT View Post
I have an LMR. I feel they are necessary for boosted applications. I had a catch can previously and it used to catch a lot due to how hard I push the car. For me, the breather tank keeps my motor happy.

Ant
I never saw the need for a catch can since I didn't have issues with oil in my intake like many others have reported.

But I was more worried about the added crank case pressure. My tuner also told me with a breather tank..will be able to smell the fumes in my cabin..is that true?

Plus it's just a silly extra tank..Isn't there other options than paying 500-600 for one?

And last question..does a catch can alone relieve enough crank case pressure if I chose to do that instead for $$ reasons?

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Old 02-14-2018, 02:32 AM
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The new designed LMR tank vents outside of the engine bay. The original tank used to vent into the engine bay close to the car's air vent, and you would smell the oil fumes in the cabin. So I think that problem is solved. I recently bought a C7 Z51 that is procharged and has 625 rwhp. I too am in your position and wanting to know if this is required, if nothing else for more peace of mind.
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Old 02-14-2018, 10:25 AM
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I am making 830whp and not using a breather tank. Haven't had any issues in the last 2 years while boosted, but I'm sure most people here would probably recommend them. That LMR unit is just so expensive.
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Old 02-14-2018, 10:42 AM
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the open vented tanks usually defeat the pcv system so you lose the crankcase filtration, and have associated fumes from the full time open venting

the sealed / closed top cans catch pcv oil (do not defeat oem pcv system) but do not add airflow capability for increases in power

what i do is a true hybrid between the two. keep pcv, stop pcv oil, control air like a race style tank



I move around 150 of these a month but don't take my word for it, ask an MMS customer what they think!
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Old 02-14-2018, 09:48 PM
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^^^ I had a LMR on my car first pulled it off & went with MMS wild catch can due to the A/A TI set up on the car. It does work on crank case pressure & oil from the intake & T.B.

if you think you don't need it then done do nothing on the car. It is your car but to me like David has said above in his statement best of both with his set up. Plus just need the bigger line with a blower on the car.
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Old 02-15-2018, 12:33 PM
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We created a really clean solution to adapt the OEM GM valve cover breather to -10an with our billet 90* adapters!
Fits all GM LT engines so there is no more need to weld bungs on the valve covers.


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Old 02-15-2018, 01:06 PM
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Originally Posted by D3PE View Post
We created a really clean solution to adapt the OEM GM valve cover breather to -10an with our billet 90* adapters!
Fits all GM LT engines so there is no more need to weld bungs on the valve covers.


Those look great. How much for a pair of the adapters?
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Old 02-15-2018, 03:25 PM
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Originally Posted by FYREANT View Post
Those look great. How much for a pair of the adapters?
They are $79.95 for the pair .. We currently have a sale going on for the next 30 days for 5% off parts orders over $300!!
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Old 02-16-2018, 01:33 PM
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The reason breather tanks exist is because early on in the aftermarket boost and tuning of the LT platform there were alot of cars that pushed the front crank seal. The front seal is weaker than the LS platform and putting a breather system on the car prevents too much crank case pressure in boost and high timing applications. Is it still necessary with much better tuning capabilities.... I say probably not. However it's cheap insurance. Pushing the front crank seal isn't fun. I did it back in 2014.

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Old 02-17-2018, 12:30 PM
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Originally Posted by robert miller View Post
^^^ I had a LMR on my car first pulled it off & went with MMS wild catch can due to the A/A TI set up on the car. It does work on crank case pressure & oil from the intake & T.B.

if you think you don't need it then done do nothing on the car. It is your car but to me like David has said above in his statement best of both with his set up. Plus just need the bigger line with a blower on the car.
Robert, If you would please post a picture of your install on the cc.. Thanks.. John
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Old 02-17-2018, 12:36 PM
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Originally Posted by [email protected] View Post
the open vented tanks usually defeat the pcv system so you lose the crankcase filtration, and have associated fumes from the full time open venting

the sealed / closed top cans catch pcv oil (do not defeat oem pcv system) but do not add airflow capability for increases in power

what i do is a true hybrid between the two. keep pcv, stop pcv oil, control air like a race style tank



I move around 150 of these a month but don't take my word for it, ask an MMS customer what they think!
I ended up just ordering a catch can and will set it up just like you did here. After talking to my tuner and also others, I believe it will release crank case pressure not to damage any of the seals. Plus it will help catch some of that oil
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Old 02-17-2018, 01:05 PM
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I have a question about the catch can in this picture. This picture shows the setup on a NA car. Will the hoses be routed the same way to the catch can as with a Super Charger?
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Old 02-18-2018, 04:19 PM
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This is a MMS catch can I just put a cover over the top. The pic above mine is a bigger pic but the can does work well..Robert


I just got the A/N lines in black from David on my set up..

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Old 02-18-2018, 07:43 PM
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Originally Posted by robert miller View Post
This is a MMS catch can I just put a cover over the top. The pic above mine is a bigger pic but the can does work well..Robert


I just got the A/N lines in black from David on my set up..
Looks really good and a clean setup. And this MMS setup will help with capturing oil and releasing crank case pressure?

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Old 02-20-2018, 08:18 PM
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Originally Posted by robert miller View Post
^^^ I had a LMR on my car first pulled it off & went with MMS wild catch can due to the A/A TI set up on the car. It does work on crank case pressure & oil from the intake & T.B.

if you think you don't need it then done do nothing on the car. It is your car but to me like David has said above in his statement best of both with his set up. Plus just need the bigger line with a blower on the car.
Did you have the vented setup or was the catch can closed up top with no breather/filter?
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Old 02-21-2018, 09:34 AM
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Originally Posted by prince8619 View Post
Did you have the vented setup or was the catch can closed up top with no breather/filter?
the pressure release option is part of both kit offerings. almost 100% of my customers take advantage of this.

there really is not a reason i can think of to want crankcase pressure to build if you don't have to.
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Old 02-21-2018, 11:26 AM
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Originally Posted by [email protected] View Post
the pressure release option is part of both kit offerings. almost 100% of my customers take advantage of this.

there really is not a reason i can think of to want crankcase pressure to build if you don't have to.
How does it work to release pressure without causing a vacuum leak?
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Old 02-21-2018, 12:06 PM
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I have a 2016 Stingray with Magnuson PD blower @6-7 PSI and never see any pressure in my mishimoto catch can. I rigged it with a 1-2PSI relieve valve (hidden in the breather filter) and a pressure switch calibrated for just under 1 PSI. The switch has never gone off as of yet. It is in vacuum until boost closes the PCV valve. If it pressurizes, it would set off the alarm (LED in the dash) and eventually open the relief valve. Again, never have seen it go off yet (it remained triggered until manually reset).

I'm guessing for higher boost applications or you do have some amount of blow by that is not escaped through the valve cover vents, then you may see some pressure...

Pics: https://www.corvetteforum.com/g/album/9162507
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