What's The Difference Between Oil/vapor Catch Can Systems?

CarMichael Angelo

clearly, I’ve got something going on in that hole
SN Certified Technician
Nov 29, 1999
Birmingham, al
All I know is mine sucks. The simplest of catch cans, I have a single -12 going into a 1qt? plastic catch can with a breather on top.

This piece of crap puffs every now and then,...the drain plug won't drain,..and because of where it is ( under the driver side fender) draining it is a pain in the ass.

So, if I buy another one of these things,..what do I look for? What will be different over what I currently have?
  • Sponsors(?)


Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
Box behind Walmart

Consider for a moment, the air velocity of the oil inlet tube. There may even be some way to measure it. All that oil kicks up, gets taken away by fast moving air to the catch-can, then gets sucked right to the bottom of the can where we hope it stops so that we can drain it in with the rest of our waste oil.

What if we doubled the diameter of of the entire path of oil vapor? We'd slow that air stream by half and probably pick up a lot less of the oil vapor. Some portion of that vapor would never make to the crank-case vent and instead, fall back into the pan.

Maybe look around in your bay and see if there's a good way to add a second PCV system. You might never have to empty that catch-can again. :shrug:


Double the capacity of the PCV system:

Decrease air velocity
Double the volume
Reduce crank pressures/increase ring seal
Last edited:
Thread starter Similar threads Forum Replies Date
rhyno9 Difference between 289 and 351 oil pickup Classic Mustang Specific Tech 2
9 is there a difference between a fox oil pan and a sn95 oil pan? Fox 5.0 Mustang Tech 3
Slithering_Joe What is the difference between a '96, '97 or '98 Cobra Oil Pan? SN95 4.6L Mustang Tech 1
C Steering Rack and Pinion differences between 1994 and 1998 1996 - 2004 SN95 Mustang -General/Talk- 0
B Spotting the difference between 95 5.0 gt and 5.0 cobra 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 39
James V Fox Difference between Fox PS pump and SN95 PS pump? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 8
D Difference between 3.73 and 4.10 gears on v6? SN95 V6 Mustang Tech 0
D Difference between hard top and convertible driver seat 2005 - 2014 S-197 Mustang -General/Talk- 0
E difference between surface pit and rock chip? Mustang Sound & Shine All 2
Blucifer99 92lx. Whats the difference between microsquirt and megasquirt for fox mustangs Digital Self-tuning Forum 10
WarHorse66 Difference between 66 & 67 rear seats 1965 - 1973 Classic Mustangs -General/Talk- 2
R What's the Difference between Walboro Fuel Pumps? SN95 4.6L Mustang Tech 0
S Difference between 03 Cobra and GT brake lines? SN95 4.6L Mustang Tech 0
Noobz347 Video Differences Between US and EU Mustangs 2015+ (S550) Mustang -General/Talk 2
9 Differences Between A 1997 - 1998 Cobra 1996 - 2004 SN95 Mustang -General/Talk- 7
USCGunner Differance Between The Gt And Lx 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 10
D Difference Between Low Priced Speakers? Mustang Sound & Shine All 2
RacerJames What's The Difference Between My Early 351 W Heads? 1965 - 1973 Classic Mustangs -General/Talk- 1
Undeadknight26 Fox Differences Between The 2016 2.3t And The Turbo Coupe 84-86 Engines? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 21
G What Is The Difference Between A 2000 Mercury Gran Marquis 4.6 And A 97 Mustang Gt 4.6? SN95 4.6L Mustang Tech 1
pretender How To Tell Difference Between Gt And Gt Premium 2005 - 2014 S-197 Mustang -General/Talk- 6
B Convertible Top Difference Between 87-90 & 91-93 Fox 5.0 Mustang Tech 11
T Difference Between 2001 And 2002 Gt 1996 - 2004 SN95 Mustang -General/Talk- 4
nick sands Questions About Difference Between 99 And 02 4.6 2v Block 1996 - 2004 SN95 Mustang -General/Talk- 6
B Engine For 05 V6 Automatic-what Will Work 05-09? Difference Between Auto & Manual 2005 - 2014 Specific V6 Tech 0
S Buying Suspension Kit. Is There A Big Difference Between Coupe & Convertible Sp SVT Tech Forum 0
JasinC19 Engine Difference Between Maf For Stock Airbox Vs Fenderwell Cai Fox 5.0 Mustang Tech 10
Paul Randle Difference Between A Regular 5.0 And A Cobra 5.0?? Fox 5.0 Mustang Tech 12
O How Significant Are The Differences Between Pertronix Versions? Classic Mustang Specific Tech 1
Copba1t Difference Between Aluminum And Steel Flywheel? Fox 5.0 Mustang Tech 4
90lxwhite rack and pinion what's the difference between these?? Fox 5.0 Mustang Tech 22
SA_Twister Difference between 05-09 vs 2010 2010 - 2014 Specific Tech 7
jocatch Difference between Rousg and MRT Interceptors? 2010 - 2014 Specific Tech 0
I iac differences between 99-04 SN95 4.6L Mustang Tech 3
Realmongo Difference between E6SE and E7TE Blocks? Fox 5.0 Mustang Tech 9
sneaky98gt Difference Between Tokico Blues and Stock Mach 1/Bullitt Shocks 1996 - 2004 SN95 Mustang -General/Talk- 3
S Differences between 2.3 and 5.0 k-member Fox 5.0 Mustang Tech 4
Simply Willens Any difference between a 4 cyl clutch cable and a 8 cyl CC? Fox 5.0 Mustang Tech 0
L Difference between Cobra R and Saleen Wheels??? 1996 - 2004 SN95 Mustang -General/Talk- 12
JymboSlice Whats the difference between... 2005 - 2014 S-197 Mustang -General/Talk- 2
BillyT903 Is there much difference between a 1999 GT and a 2001 Cobra Exhaust? 1996 - 2004 SN95 Mustang -General/Talk- 2
FastRedPonyCar Honest difference between the 3.55's and 3.73's? 2010 - 2014 Specific Tech 10
JarvisB Can I run tires with different load rating between rear and front? Fox 5.0 Mustang Tech 3
Kdubslugga What is the difference between a roots blower and a twin screw? Fox 5.0 Mustang Tech 3
BillyT903 Is there a difference between Satin Silver Clearcoat and Silver Clearcoat Metallic? 1996 - 2004 SN95 Mustang -General/Talk- 6
J difference between v6 and v8 prochargers 2005 - 2009 Specific Tech 2
Kdubslugga What is Torque, whats the difference between that and HP? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 16
S Trying to decide between 2 different types of Wheels - HELP 1996 - 2004 SN95 Mustang -General/Talk- 13
S difference between 95 and 98 v6? head gasket SN95 V6 Mustang Tech 3
T wiring differences between 1988 and 1992 2.3L (N/A & Turbo) Tech 0
Similar threads