A short write up for those not sure on what the format is concerning oil catch tanks and how they are so beneficial to the direct injection engine.
Also why they work so well in conjunction with pcv delete setup's, either part or full.
So take a seat , get your cuppa and biscuit tin and have a read and make up your own mind on the subject.
I'm an avid supporter of it so a tad biased but have a read and enhance your engines life.
Catch can or no catch can , that is the big question.
Are they really any good, do they really work and do i really need one, well the answer is most certainly yes.
This write up may help to providing a better detailed explanation showing why a catch can is highly recommended in direct injection engine applications.
First, let's go over what occurs in your engine without a catch can installed. All internal combustion engines that run off petrol are 4 stroke engines (not 2 stroke). This means that the piston has to go up and down a total of 4 times to complete a cycle. The piston first goes down with the intake valves open creating a vacuum. This draws in the cool dense air for combustion.
At the same time, fuel is injected into the cylinder. The intake valves close and then the piston rises up towards the top of the cylinder. This compression creates an immense build-up of pressure in the cylinder. The only things containing this high pressure are the cylinder itself, the piston and the piston rings that seat against the walls of the cylinder.
The intake and exhaust valves are obviously closed as well. The pressure is so high that a very small amount of the air escapes around the piston and piston rings into the crankcase. This is called blow-by. The amount of blow-by increases as the engine RPMs rise. Also, an engine with more cylinders will have more blow-by. Obviously not all of the air escapes or else combustion wouldn't take place.
Inside the crankcase, you have the crank which is turning in the oil sump which is full of oil. This keeps it properly lubricated. PCV or positive crankcase ventilation is necessary to ensure there isn't a build up of pressure in the crankcase. This would cause the crankcase to possibly crack under the pressure and create a huge mess of oil . So the PCV system removes the pressure from the crankcase and reverts it back through the intake tract via crank case vents.
This pressure isn't made up of 100% air. It will also contain a very small amount of oil and that oil will be contaminated by mositure etc and since there is so much in the oil pan at a high temperature. This air and oil mixture is then entered somewhere after the intake system, passes through the intercooler (if you car is turbo or supercharged) and then re-enters the combustion chamber (cylinder) through your intake valves to be re-burned.
The oil will actually coat everything on its way back to the combustion chamber. It will develop in the intercooler, boost hoses, intake manifold and intake valves. Just on the other side of these valves is where the combustion is taking place where the temperatures are extremely high. This is what actually causes the oil to solidify on the valves. With the oil passing through the intercooler, it can actually coat the cooling fins which will hinder the intercooler's ability to cool the air therefore lowering the efficiency.
The caking on intake valves is only a problem with direct injection engines. For all other engines that use port injection, the fuel is introduced before the combustion chamber which means it flows over the intake valves and enter the combustion chamber premixed with the air. This action of the fuel flowing over the intake valves actually cleans the valves from any oil that make already be on there. The oil never has the chance to cake on the valves in port injection engines.
Having oil caked onto your intake valves can cause the following symptoms:
Knocking
Pre-ignition
Loss in power
Loss in fuel economy
This is mainly due to the fact that the air that comes through your intake system and goes into the combustion chamber won't just be air. It will contain some oil particles which cause the combustion process to be slightly less efficient.
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 to and you can't expel it into the atmosphere because it's not environmentally friendly and is considered to not be compliant.
Another question that arises is why isn't a catch can included from the factory? Well it's pretty simple actually. Most people don't even change their oil (scary but true) so will they think to empty the catch can regularly? The answer is obviously and unfortunately, no.
An oil catch can does just that. It catches or prevents the oil from re-entering the intake tract. A catch can is placed right after the PCV and before the intercooler.
A PCV delete setup will remove the PCV valve completely or partially and oil catch can location can be customised to suit specific applications.
This means that a more pure (sometimes 100% pure) air mixture will go through the intercooler and intake valves. A more pure air mixture entering the intake valves means no caking and none of the symptoms listed above.
An oil catch can typically uses steel wool or a baffle system that removes the oil from the air-oil mixture. Higher quality cans use the baffle systems since it is less messy and better at separating the mixture. The oil falls to the bottom of the can where it is stored until the can is emptied.
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 are always running the most power possible by having a cleaner intake tract free of oil.
So there you go, something to think about the next time you jump in your car.
Rob
Also why they work so well in conjunction with pcv delete setup's, either part or full.
So take a seat , get your cuppa and biscuit tin and have a read and make up your own mind on the subject.
I'm an avid supporter of it so a tad biased but have a read and enhance your engines life.
Catch can or no catch can , that is the big question.
Are they really any good, do they really work and do i really need one, well the answer is most certainly yes.
This write up may help to providing a better detailed explanation showing why a catch can is highly recommended in direct injection engine applications.
First, let's go over what occurs in your engine without a catch can installed. All internal combustion engines that run off petrol are 4 stroke engines (not 2 stroke). This means that the piston has to go up and down a total of 4 times to complete a cycle. The piston first goes down with the intake valves open creating a vacuum. This draws in the cool dense air for combustion.
At the same time, fuel is injected into the cylinder. The intake valves close and then the piston rises up towards the top of the cylinder. This compression creates an immense build-up of pressure in the cylinder. The only things containing this high pressure are the cylinder itself, the piston and the piston rings that seat against the walls of the cylinder.
The intake and exhaust valves are obviously closed as well. The pressure is so high that a very small amount of the air escapes around the piston and piston rings into the crankcase. This is called blow-by. The amount of blow-by increases as the engine RPMs rise. Also, an engine with more cylinders will have more blow-by. Obviously not all of the air escapes or else combustion wouldn't take place.
Inside the crankcase, you have the crank which is turning in the oil sump which is full of oil. This keeps it properly lubricated. PCV or positive crankcase ventilation is necessary to ensure there isn't a build up of pressure in the crankcase. This would cause the crankcase to possibly crack under the pressure and create a huge mess of oil . So the PCV system removes the pressure from the crankcase and reverts it back through the intake tract via crank case vents.
This pressure isn't made up of 100% air. It will also contain a very small amount of oil and that oil will be contaminated by mositure etc and since there is so much in the oil pan at a high temperature. This air and oil mixture is then entered somewhere after the intake system, passes through the intercooler (if you car is turbo or supercharged) and then re-enters the combustion chamber (cylinder) through your intake valves to be re-burned.
The oil will actually coat everything on its way back to the combustion chamber. It will develop in the intercooler, boost hoses, intake manifold and intake valves. Just on the other side of these valves is where the combustion is taking place where the temperatures are extremely high. This is what actually causes the oil to solidify on the valves. With the oil passing through the intercooler, it can actually coat the cooling fins which will hinder the intercooler's ability to cool the air therefore lowering the efficiency.
The caking on intake valves is only a problem with direct injection engines. For all other engines that use port injection, the fuel is introduced before the combustion chamber which means it flows over the intake valves and enter the combustion chamber premixed with the air. This action of the fuel flowing over the intake valves actually cleans the valves from any oil that make already be on there. The oil never has the chance to cake on the valves in port injection engines.
Having oil caked onto your intake valves can cause the following symptoms:
Knocking
Pre-ignition
Loss in power
Loss in fuel economy
This is mainly due to the fact that the air that comes through your intake system and goes into the combustion chamber won't just be air. It will contain some oil particles which cause the combustion process to be slightly less efficient.
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 to and you can't expel it into the atmosphere because it's not environmentally friendly and is considered to not be compliant.
Another question that arises is why isn't a catch can included from the factory? Well it's pretty simple actually. Most people don't even change their oil (scary but true) so will they think to empty the catch can regularly? The answer is obviously and unfortunately, no.
An oil catch can does just that. It catches or prevents the oil from re-entering the intake tract. A catch can is placed right after the PCV and before the intercooler.
A PCV delete setup will remove the PCV valve completely or partially and oil catch can location can be customised to suit specific applications.
This means that a more pure (sometimes 100% pure) air mixture will go through the intercooler and intake valves. A more pure air mixture entering the intake valves means no caking and none of the symptoms listed above.
An oil catch can typically uses steel wool or a baffle system that removes the oil from the air-oil mixture. Higher quality cans use the baffle systems since it is less messy and better at separating the mixture. The oil falls to the bottom of the can where it is stored until the can is emptied.
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 are always running the most power possible by having a cleaner intake tract free of oil.
So there you go, something to think about the next time you jump in your car.
Rob
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It's a 1.8TSI CDHB in a Exeo ST(Audi A4 B7 platform/body)
