Catch can needed?

[CheekyOldMan]

UPR on my 2.7. 1,000 miles. Bone dry. Total waste of money.

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[jjack50]

Guess you do not understand a direct injection engine. There is 0 gasoline flowing in the intake or on the back of the valves. There are plenty of videos of DI cars with charcoal in the top of the intake valves and on the head. 1st instance for me was when bmw went DI on their turbo 6s, guy's car started running horrible, took off valve cover it looked like a grill at a campground. It has nothing to do with blow by it is a function of the PCV system and CCV system pushing oily air into the intake with 0 gas to clean out the residue.

Direct Injection= fuel (gasoline in this case) injected into the cylinders only and not into the intake air stream under idle or throttle load.

Yes, I understand direct injection. I also understand blow-by, crankcase pressurization, crankcase ventilation systems, air-oil separators, and catch-cans.
The PCV system is there because of blow-by. Cylinder gasses getting by the rings is blow-by. That pressurizes the crankcase which must then be ventilated to reduce the pressures. That's the PCV system. Modern GDI engines have an air-oil (or vapor) separator in the PCV system that takes most of the oil and water out of the PCV stream before it is plumbed into the intake. The liquids are then dumped back into the crankcase.

Yes, many GDI cars have a problem with carbon buildup (not charcoal) in the intake runners and at the back of the valves because they do not have the vapor separator included in the system.

 

[dejones64]

UPR on my 2.7. 1,000 miles. Bone dry. Total waste of money.

I thought the same when I put one on my Bronco Sport. Can started collecting fluid during the winter months.

 

[MannyG20]

For what it’s worth - 6000 miles in and my catch can is bone dry. Haven’t collected a drop. I guess I should be happy.

 

[BroncoAZ]

For what it’s worth - 6000 miles in and my catch can is bone dry. Haven’t collected a drop. I guess I should be happy.

2.7L or 2.3L?

 

[MannyG20]

2.7L or 2.3L?

2.3L, 7MT

 

[Willub]

I thought the same when I put one on my Bronco Sport. Can started collecting fluid during the winter months.

That’s just water condensation. Nothing that’s worth catching.

 

[BluePonyGT]

I installed the Mishimoto last weekend. As soon as I pulled the connection off the PVC port on the intake oil started running out of the tube. I'll give it a week or so and see what's in the can.

 

[SirLawrence]

I have a 2.3 Bronco with a Mishimoto Catch Can, and it was over half full after just 3000 miles. From things I had read, I was expecting like a few tablespoons. I am going to have to empty it more often than I thought!

 

[Area51BS]

So

Doesn’t need it. Catch cans don’t do anything when the engine is under boost. There are two crankcase ventilation systems. One for low pressure that feeds vapors back into the intake stream and the other that works under boost and is in the top end of the engine that you don’t have access to that does the same thing but has a more complicated vapor path due to the pressures involved. Catch cans hook into the low pressure system only and catch and condense primarily oil vapors and water vapors that would normally just flow into the cylinders, especially when they are hooked into the vent system after the air-oil separator that’s already there. And only when the turbo is not spooled up which means at the lowest crankcase pressures When blow-by is lowest.
It’s a ‘feel good’ add on that is of no real benefit.

where does all the baked on crud on back of valves come from?

 

[UM_Ftown]

Direct Injection= fuel (gasoline in this case) injected into the cylinders only and not into the intake air stream under idle or throttle load.

Yes, I understand direct injection. I also understand blow-by, crankcase pressurization, crankcase ventilation systems, air-oil separators, and catch-cans.
The PCV system is there because of blow-by. Cylinder gasses getting by the rings is blow-by. That pressurizes the crankcase which must then be ventilated to reduce the pressures. That's the PCV system. Modern GDI engines have an air-oil (or vapor) separator in the PCV system that takes most of the oil and water out of the PCV stream before it is plumbed into the intake. The liquids are then dumped back into the crankcase.

Yes, many GDI cars have a problem with carbon buildup (not charcoal) in the intake runners and at the back of the valves because they do not have the vapor separator included in the system.

Does the 2.3 in the Bronco have a vapor separator system?

 

[jjack50]

Does the 2.3 in the Bronco have a vapor separator system?

Yes it does.

 

[TT6gbd]

1st gen 2.7 was direct injection….2nd gen 2.7 (the one on our 6gen bronco) is dual injection

 

[TT6gbd]

.

 

[TT6gbd]

If you watch the video I posted the guy explains the dual injection. Also that doesn’t mean is perfect and you don’t need a catch can but it will educate you on the engine and maybe narrowing down the decision on putting the oil catch can or not. I’m honestly undecided as of now but I’m keeping my options open and hoping someone with more knowledge can throw their 2 cents

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