,
Now that you know the basics, I’m sure you’re wondering what (if anything) can be done to improve the system. Well, you certainly won’t be alone! Plenty of people want to reduce blow-by, clean up the engine bay, simplify the crank case ventilation system, and/or prevent every last bit of oil from being sucked into the intake and gumming things up. However, the system is a little more complicated than most people think and it’s actually well designed from the beginning so it’s hard to improve on. Always keep tube diameter in mind, as it is very important for flow. Most catch cans on the market actually introduce a huge restriction to the system.
On to the different methods of improving, or completely messing up the factory crank case ventilation system. These methods will cover a huge mix of things I’ve seen done, or that I thought up in my head. Some will be great ideas, some will be good ideas, some will be bad ideas, and some will be awful ideas. I’m going to keep things simple by rating each method on the important points so you can just give it a quick look and see immediately if it’s a good idea or not.
WOT “Catch Can” Elimination on 1991-1999 Engines Via CAP Method
Effect on the following characteristics:
- De-clutters the engine bay – Yes
- Simplifies crank case ventilation system – Yes
- Helps remove more oil from the air – No
- Help evacuate the crank case – No
- Maintains or improves the stock flow capacity – No
- Helps promote ring seal and prevent blow-by – No
- Helps prevent oil smoke in exhaust – No
- Helps prevent dip stick from popping out – No
- Helps prevent oil leaks due to pressure – No
- Helps keep intake track clean including throttle body – No
- Helps keep intake manifold/plenum clean – No
- Maintains or reduces amount of pollutants – Maybe
- Maintains prevention of un-metered air from entering the intake – Yes
Consensus: BAD IDEA
WOT “Catch Can” Elimination on 1991-1999 Engines Via BYPASS Method
Effect on the following characteristics:
- De-clutters the engine bay – Yes
- Simplifies crank case ventilation system – Yes
- Helps remove more oil from the air – No
- Help evacuate the crank case – No change
- Maintains or improves the stock flow capacity – No change
- Helps promote ring seal and prevent blow-by – No change
- Helps prevent oil smoke in exhaust – No change
- Helps prevent dip stick from popping out – No change
- Helps prevent oil leaks due to pressure – No change
- Helps keep intake track clean including throttle body – No
- Helps keep intake manifold/plenum clean – No
- Maintains or reduces amount of pollutants – No
- Maintains prevention of un-metered air from entering the intake – Yes
Consensus: BAD IDEA
Venting WOT Section To Atmosphere on 1991-1999 Engines Via “BREATHER FILTER”
Effect on the following characteristics:
- De-clutters the engine bay – Maybe
- Simplifies crank case ventilation system – Maybe
- Helps remove more oil from the air – No change
- Help evacuate the crank case – No
- Maintains or improves the stock flow capacity – Yes
- Helps promote ring seal and prevent blow-by – No
- Helps prevent oil smoke in exhaust – No
- Helps prevent dip stick from popping out – No
- Helps prevent oil leaks due to pressure – No
- Helps keep intake track clean including throttle body – Yes
- Helps keep intake manifold/plenum clean – Yes
- Maintains or reduces amount of pollutants – No
- Maintains prevention of un-metered air from entering the intake – No
Consensus: BAD IDEA
