Venting crankcase pressure? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

jayno20 · 02-01-2015, 10:55 PM

Quote:

Originally Posted by hammdo

I have the Mightmouse Breather on mine:

-Don

Is that just an oil cap that is ventilated?

Smittty · 02-02-2015, 12:13 AM

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Here is a pick of the new mount and catch can. David used my car to design the new brackets.

hammdo · 02-02-2015, 10:17 AM

Quote:

Originally Posted by jayno20

Is that just an oil cap that is ventilated?

It releases pressure but has internals (I believe a way to trap the oil) to prevent oil from escaping -- but it is an new oil filler cap -- and a bit taller too so the beauty cover (on mine) was taken off. i need to raise the post about 3/8 in to get it to fit again...

So far, has done a great job...

-Don

Bretts · 02-02-2015, 10:52 AM

I have one coming also thanks for lending him your car, it on route as we speak

jayno20 · 02-02-2015, 01:10 PM

Quote:

Originally Posted by hammdo

It releases pressure but has internals (I believe a way to trap the oil) to prevent oil from escaping -- but it is an new oil filler cap -- and a bit taller too so the beauty cover (on mine) was taken off. i need to raise the post about 3/8 in to get it to fit again...

So far, has done a great job...

-Don

So it vents pressure and replaces the current oil cap? Also it wont fit with the engine cover?

Unreal · 02-02-2015, 02:48 PM

I didn't have issues with a vented cap until I did 1/2 mile races. Short blast on the street it is fine, but do a 0-180mph and oil was everywhere.

hammdo · 02-02-2015, 03:07 PM

Quote:

Originally Posted by jayno20

So it vents pressure and replaces the current oil cap? Also it wont fit with the engine cover?

Yes, vents and replaces the oil cap, and I had to add spacers to the fuel rail bolts in order for the cap to have clearance for the cover. About 3/8" to 1/2 thick.

-Don

PQ · 02-02-2015, 03:21 PM

I have one that I just discovered the check valve was in backward from the maker. Ugh...........

Let air in but not out. Should have been the other way around.

vatechguy3 · 02-02-2015, 07:36 PM

How much boost do you need to be running when this becomes an issue?

Tony

Smittty · 02-02-2015, 08:20 PM

Quote:

Originally Posted by jayno20

Just was reading a thread where a guy possibly blew a seal due to too much crankcase pressure. I was just wondering with my upcoming mods (28% over drive lower pulley, stainless power headers, 1 step colder plugs, and tune) if I will want to do anything special for venting excess crankcase pressure. I already have an Apex catch can which I read helps, but is there anything else I should consider to avoid these kind of problems?

I would contact David at Mighty Mouse Catch Cans. I am very Happy with the new setup he put together for me. The old setup was just not working. If you have any questions just pm me.

crg · 02-02-2015, 08:21 PM

I had an oil cap vent on mine for about 3000 miles. Got on the gas one day and check engine light came on with an O2 sensor code. Brought it to the dealer and after checking it out, they said it was the breather throughout the voltages off and that the PCV had to be a closed system. Put the original cap back on and code has not returned. Has anyone with the filler cap breathers had this issue or is dealer full of it.

Stephen12ZL1 · 02-02-2015, 09:01 PM

Quote:

Originally Posted by crg

I had an oil cap vent on mine for about 3000 miles. Got on the gas one day and check engine light came on with an O2 sensor code. Brought it to the dealer and after checking it out, they said it was the breather throughout the voltages off and that the PCV had to be a closed system. Put the original cap back on and code has not returned. Has anyone with the filler cap breathers had this issue or is dealer full of it.

Lean or rich 02 code? If you get a tune with the breather in place, there will not be an issue. If they had to replace an 02 that was faulty, they are full of it.

ZO6 Bryan · 02-02-2015, 09:07 PM

Quote:

Originally Posted by crg

I had an oil cap vent on mine for about 3000 miles. Got on the gas one day and check engine light came on with an O2 sensor code. Brought it to the dealer and after checking it out, they said it was the breather throughout the voltages off and that the PCV had to be a closed system. Put the original cap back on and code has not returned. Has anyone with the filler cap breathers had this issue or is dealer full of it.

No, they know what they are talking about. If you have an open breather it brings in air that has not been metered by the MAF sensor. Look at the stock routing. The breather hoses from the valve covers lead to the intake tube after the MAF but before the throttle blades. The air entering the crankcase has been measured/metered by the MAF. Then it exits the crankcase thru the PCV hose and goes in the intake AFTER the throttle blade and into the engine. If the PCV airflow hasn't been measured it's the same as a vacuum leak and will lean out the engine.

BoostedX2 · 02-03-2015, 07:04 AM

Im running the Lingenfelter 2.55 upper..wonder if I'm making enough boost to worry about this...its street driven only, short blasts...

02-02-2015, 12:13 AM	#16
Smittty Drives: 2013 ZL1 Camaro 2000 SLP Camaro Join Date: Oct 2012 Location: Ruther Glen, VA Posts: 357	Here is a pick of the new mount and catch can. David used my car to design the new brackets. __________________ 2013 ZL1 748rwhp & 733 rwtq ( 93 tune )

02-02-2015, 10:52 AM	#18
Bretts SS Drives: 2015 2ss rs Join Date: Oct 2014 Location: Alberta Posts: 911 View My Garage	I have one coming also thanks for lending him your car, it on route as we speak __________________ CCW sp16a track set, BTR stage 3 cam and kooks longtubes with high flow catsLocks@7.5 degrees castor and radius arm inserts, Ride Tech 2coilovers JDP upper control arm bushings BMR lower knuckle bushing Bo White throttle body3.91 gears Spohn del-sphere toe link and trailing arms Prothane subframe bushings

02-02-2015, 02:48 PM	#20
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	I didn't have issues with a vented cap until I did 1/2 mile races. Short blast on the street it is fine, but do a 0-180mph and oil was everywhere. __________________ Nick Corvette Z06 -1200ish rwhp

02-02-2015, 03:21 PM	#22
PQ Booooosted. Drives: 2010 Supercharged SS Join Date: Apr 2008 Location: Mobile, AL Posts: 36,716 View My Garage	I have one that I just discovered the check valve was in backward from the maker. Ugh........... Let air in but not out. Should have been the other way around. __________________

02-02-2015, 07:36 PM	#23
vatechguy3 Drives: 2014 ZL1 M6 Join Date: Jul 2014 Location: Virginia Posts: 493	How much boost do you need to be running when this becomes an issue? Tony __________________ 2014 ZL1 M6 Bone stock, for now! 2001 Z28 M6 !cags, !air, FTP 85mm Lid, Z06 85mm MAF, P&P TB !4x4, Strano Springs, Strano Sways, Koni 4/4s, Watts Link ARH LTs, ARH catted Y, SLP catback with Dual/Dual Muffler, SLP CME and Valance OE Wheels Machined Face C5 DDs, 18x10.5s, with 295/35-18s on all 4 corners! 352rwhp and 366rwtq

02-02-2015, 08:21 PM	#25
crg Drives: '68 Camaro SS, '74 Corvette Join Date: Jul 2009 Location: Louisiana Posts: 39	I had an oil cap vent on mine for about 3000 miles. Got on the gas one day and check engine light came on with an O2 sensor code. Brought it to the dealer and after checking it out, they said it was the breather throughout the voltages off and that the PCV had to be a closed system. Put the original cap back on and code has not returned. Has anyone with the filler cap breathers had this issue or is dealer full of it.

02-03-2015, 07:04 AM	#28
BoostedX2 Drives: VR ZL1 #259/Nissan 370Z NISMO Join Date: Aug 2008 Location: Ohio Posts: 1,071	Im running the Lingenfelter 2.55 upper..wonder if I'm making enough boost to worry about this...its street driven only, short blasts...