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Catch Cans: Keeping the Oil Out

Shop Mustang Catch Cans

Not all engine mods are simple. Especially ones that lessen the risk of a high horsepower build from blowing itself up. With catch cans, they're both simple to install, and will help keep your engine turning despite big power mods.

Shop Catch Cans

Oil in your intake is never a good thing. The combination of modern PCV systems and high performance engines (particularly forced induction) increases the chance of sucking oil into the intake. A simple solution? A catch can.

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Why Do I Need a Catch Can?

Mustang, amongst other vehicles, utilize a positive crankshaft ventilation system, or PCV. The PCV system helps alleviate combustion pressure from an engine’s crankcase by using engine vacuum to suck the pressure out of the crankcase. Once the air pressure is drawn out of the crankcase, it is reintroduced into the intake charge as it enters the engine. While PCV systems play an important role in engine operation, (such as reducing emissions) they do create a negative side effect, particularly in high-performance applications.

As PCV systems suck the pressure out of the crankcase, it also draws out a fine mist of oil which is then included in the air/fuel intake charge. Although you might not notice any performance loss in a stock engine, the excess oil included in the intake charge can lead to reduced combustion, fouled spark plugs, detonation, a dirty throttle body/intake manifold, and it can even lower the octane of the fuel. A catch can is designed to stop oil from traveling all the way through the system and storing it in a can. It’s an inexpensive option to keep the engine in top shape, and it's never a bad idea to invest in a catch can.

Mishimoto Baffled Oil Catch Can for S550 Mustangs

How Many Do I Need?

On S197 (5.0L) and S550 models, the primary side that needs a catch can is the passenger side. For the 4.6 3-valve engines (2005-2009) the primary side is the driver’s side. Having one for the opposite side is not a bad thing. However, there isn't much need for the little amount of blowby it has. It wasn’t a real concern unless the mustang had a supercharger equipped. In the past, on a stock engine a catch can wasn’t really needed as the blowby was very miniscule. On the contrary, with the release of the new 5.0 engines, in stock form they are still a huge asset to one’s build. A completely stock 5.0 has a decent amount of blowby, enough to where a catch can is highly recommended.

Catch Can Installed on a S197 5.0 Mustang

Wouldn't a Breather Do the Job?

A breather is basically a cap that goes on the valve cover on the PCV end. Rather than have any fuel go back through the system it allows the pressure to be relieved by letting the gases evaporate through a filter. In order to prevent a leak on the intake side,when utilizing a breather, the intake must be capped off. It has a few downfalls though. The main one is that it gets the engine bay quite dirty. It also can give a smell of oil/raw fuel. Filters have to be replaced when no longer effective while a catch can simply has to be emptied and reconnected.

Is a Tune Needed? How Hard is the Install?

The beauty of a catch can is it’s such a simple modification. No aftermarket tune is needed, and if you have a tune it does not need to be retuned. Installation takes all of 5 minutes; it’s as easy as disconnecting and reconnecting a hose. Checking the catch can should only take a few minutes from opening to closing the hood.

In review, here are the quick things needed to know for a catch can:

  • 5.0 Coyote owners only really need the passenger’s side. 
  • Simple install with no need for tuning
  • Prevents blowby created by the engine
  • Keeps the engine generally healthier
  • Inexpensive
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