PCV system, vent or not to vent to atmosphere...
Thread Starter
Senior Member
Joined: Feb 2006
Posts: 264
Likes: 0
From: Clarksville, TN
G63
PCV system, vent or not to vent to atmosphere...
i know this subject has been beat to death in different threads in the past, but are most of you guys venting your PCV lines to a catch can and then venting the can to the the atmosphere, or are you returning it to your throttle body?
i do not have emissions checks were im located, so im gauging the idea of just putting a breather on my catch can, and capping off the return in the throttle body
i do not have emissions checks were im located, so im gauging the idea of just putting a breather on my catch can, and capping off the return in the throttle body
MBWorld Fanatic!
Joined: Mar 2011
Posts: 1,879
Likes: 22
From: Orange County, CA.
one car at a time
I run the the lines to catch cans and then back to the throttle body...(I would not recommend venting to atmosphere for a variety of reasons, none of which are emission related...)
You want vacuum to help relieve the pressure...If you really want to gain some hp, you can actually vent the oil fill cap to the exhaust, but only if you are not running cats...
You want vacuum to help relieve the pressure...If you really want to gain some hp, you can actually vent the oil fill cap to the exhaust, but only if you are not running cats...
Thread Starter
Senior Member
Joined: Feb 2006
Posts: 264
Likes: 0
From: Clarksville, TN
G63
I run the the lines to catch cans and then back to the throttle body...(I would not recommend venting to atmosphere for a variety of reasons, none of which are emission related...)
You want vacuum to help relieve the pressure...If you really want to gain some hp, you can actually vent the oil fill cap to the exhaust, but only if you are not running cats...
You want vacuum to help relieve the pressure...If you really want to gain some hp, you can actually vent the oil fill cap to the exhaust, but only if you are not running cats...
MBWorld Fanatic!
Joined: Mar 2011
Posts: 1,879
Likes: 22
From: Orange County, CA.
one car at a time
Some people vent to atmosphere and others use vacuum to help relieve pressure (and gain hp). If you look into what some of the pros do, you may learn a few tricks - google crankcase vacuum pumps. Here is a good link: http://www.dragstuff.com/techarticles/vacuum-pumps.html
It really depends on what your goals are : (1) looks, (2) performance, (3) solving a problem. I generally focus on (2) & (3) and use catch cans in all of my street cars (often saikou michi brand) and run back to the intake. For a street car, the other issue could be spraying a fine film of oil all over the engine bay, so if you do vent to atmosphere make sure you use a catch can (like dc3). On my e55, I just used two fuel filters (connected to the stock lines) and then routed back to the intake. I drive the car a fair bit in vacuum (not WOT all the time) and find the filters to catch a decent amount of oil. For race cars, it is different and depending on the rules, often use vacuum pumps, exhaust, or similar. Good luck
Last edited by cij911; Aug 17, 2014 at 10:34 AM.
MBWorld Fanatic!
Joined: Dec 2011
Posts: 4,599
Likes: 102
From: Florida
A Merc
This explains a bit more although it's a diff car
http://media.wix.com/ugd/dddf24_90f7...6e93194093.pdf
http://media.wix.com/ugd/dddf24_90f7...6e93194093.pdf
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,124
Likes: 32
From: Florida-Germany-New York
2004 E55,1969 300SEL6.3,2011 ML350 BlueTec Diesel,2005 ML400 CDI
This is a very well made unit that is small enough to fit between the firewall and the engine shroud (next to the aux battery). My TB is bone dry.
http://www.customcorvetteaccessories...lcatchcan.html
http://www.customcorvetteaccessories...lcatchcan.html
PLATINUM SPONSOR
Joined: Jun 2008
Posts: 3,834
Likes: 65
From: Texas
2003 CL55
It is more than just to vent or not to vent, it is to have extra crank case pressure or not. Our crankcase lines pull vacuum on the crank, and reduces pressures on the pistons as they travel , among other things. If you notice on the V12`s, thay have a pump to actually create large amounts of vacuum on the crank case and one reason many race cars also use vacuum pumps to reduce this pressue. This is even more important on boosted engines. Removing crankcase vacuum, can alow for more oil to be pushed into the oil catch can by distrupting the crankcase vacuum. Just something to look at and research before you go back to late 60`s muscle car catch can technology
__________________
E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
