What Does a Oil Catch Can Do?

Oil catch cans are simple devices that can greatly benefit direct-injected engines. They prevent oil and other contaminants from causing buildup inside your engine’s intake manifold. Here’s how they work, and why you might want to install one on your own car.

What are the benefits of an oil catch can?

Oil catch cans are simple devices that can greatly benefit direct-injected engines. They prevent oil and other contaminants from causing buildup inside your engine’s intake manifold.

Does a oil catch can add horsepower?

An oil catch can doesn’t add any power or make any cool noises so it is often overlooked when modifying vehicles. However, a catch can will ensure you always have a cleaner intake tract free of oil, and help keep your engine running better for longer.

Is an oil catch can worth it?

The answer is yes. While a catch can won’t stop every last particle of contaminant from entering the intake manifold and coating the valves in a direct-injection engine, the less unwanted buildup the better. … So, yes, a catch can isn’t a bad idea. At a minimum, it’s not a scam.

Is an oil catch can illegal?

Although a catch can could help your car’s engine run well for a long time, modifying the PCV system is illegal since it’s part of the engine’s emissions system. If a technician were to see an oil catch can installed on your car while performing an emissions test, they may fail you on the spot.

There is a large debate as to whether or not oil catch cans are worth the money or not. This article is dedicated to providing a very detailed explanation showing why a catch can is highly recommended in direct injection engine applications.

So the PCV system removes the pressure from the crankcase and reverts it back through the intake tract via crank case vents. You might ask why do car manufacturers revert this crankcase pressure back into the intake tract?

Well, for starters there isn’t anywhere safe to revert it, and you can‘t expel it into the atmosphere because it’s not environmentally friendly and is considered to not be street legal. Most people don’t even change their oil at proper intervals (scary but true) so will they think to empty a catch can regularly? A more pure air mixture entering the intake valves means no caking and none of the symptoms listed above.

An oil catch can doesn’t add any power or make any cool noises so it is often overlooked when modifying vehicles. However, a catch can will ensure you always have a cleaner intake tract free of oil, and help keep your engine running better for longer.

High horsepower and more notably BOOSTED engines create conditions in an engine that are not typically or ever seen in their factory form. Pressure built by faster moving engine parts, wider ring gaps, looser tolerances, and stresses on components can allow for crank case pressure to increase. Not allowing the excess crank case pressure out can cause even more issues including: seal failure, loss of horsepower, oiling issues, and even fire hazards as oil exits seals. There are two types of catch cans that exist, but only one truly is appropriate for high horsepower applications.

The lines from the valve covers act as an escape route for built up crank case pressure. This will knock the oil particulate out of the charge before it turns the corner and heads out of a small air filter at the top of the catch can.

It is important to note this is not a vacuum leak, crank case pressure is completely separate of the pumping side of the engine where your intake and cylinders are connected to.

Its hard to imagine that, with all the talk about oil catch cans, that no car comes from the factory with one already installed. If you look under the hood of a car and see an oil catch can, its an after-purchase addition, designed to increase the engines efficiency by reducing blowby that is otherwise sent back into the engines intake.

The oil catch can stops that blowby from going back into the air intake of the engine. Although there are some commercial oil catch cans available, some people create homemade models from old food jars or steel wool.

Carbon deposits reduce the efficiency of your engine, causing disruptive shaking during idling and unexpected ignition failures.

Oil Catch Cans: The Complete Guide

It’s hard to imagine that, with all the talk about oil catch cans, that no car comes from the factory with one already installed. If you look under the hood of a car and see an oil catch can, it’s an after-purchase addition, designed to increase the engine’s efficiency by reducing blowby that is otherwise sent back into the engine’s intake.

What is an oil catch can?

An oil catch can captures the excess oil that passes through the piston seals into the crankcase of your car. Ideally, the oil that lubricates the pistons — necessary for the engine function — is at a precise measure with no waste. But very often the process creates the oily blowby. The oil catch can stops that blowby from going back into the air intake of the engine.

How does it work?

The oil catch can is placed between the pcv valve and the crankcase. The excess oil collects in the catch can, which must be periodically emptied and rinsed. Although there are some commercial oil catch cans available, some people create homemade models from old food jars or steel wool.

What are the benefits?

Preventing the blowby from entering the air intake keeps the engine in better condition. Ideally, the engine should use fresh air to start and run. If the blowby cycles through, that air is no longer fresh.The result is a buildup of deposits that reduce engine efficiency. Among those deposits are carbon, which must be removed. Carbon deposits reduce the efficiency of your engine, causing disruptive shaking during idling and unexpected ignition failures. They also shorten the life of components so you may have to do maintenance more often.

Is it necessary?

Strictly speaking, any car can continue to run without an oil catch can. However, if you do not install one, you have to take other steps to deal with the effects of blowby in your vehicle. One is the removal of the manifold in the DFI engine so the deposits can be cleaned off. This is a big job, but there are commercial products such as the 104+ Fuel Injector Pro to help you do it.