Catch can

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Andy B

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Having just ordered a new 2023 Expy SPP this thread got me reading up on catch cans. This will be my first forced induction engine.

On some online resources (F150 forum for example) they seem to think the addition of port injection on the newer EcoBoost motors makes a catch can less important.

It's still "better" but the difference in fouling could be lesser.

Anyone have any good links or knowledge to share on this thought?
 

TheDoug

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It will help regardless of the addition of port injection. I still get plenty of junk out of my catch can each oil change.

Now is it 100 percent necessary, no...
 

LokiWolf

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@Andy Bajorinas Here are the kits for the 4th Gens from J&L
 

LokiWolf

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Having just ordered a new 2023 Expy SPP this thread got me reading up on catch cans. This will be my first forced induction engine.

On some online resources (F150 forum for example) they seem to think the addition of port injection on the newer EcoBoost motors makes a catch can less important.

It's still "better" but the difference in fouling could be lesser.

Anyone have any good links or knowledge to share on this thought?
It was discussed in this thread above, and in the other also.
 

Expoxone

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Nope, you would be incorrect.

Whoever told you that was 100% incorrect.

The Gen2 3.5(Gen 4 - 2018+ Expeditions) Twin Turbo Ecoboost motor has BOTH port and direct. Under MOST situations the direct injectors are used, because of the more accurate fuel metering that can be delivered. Port is used for Cold startups, and under low load. The DI picks ups once up to operating temp and high loads, and under real high load and demands for fuel, both injectors are used.

Edit: Clarity on above. So basically when you are a greatest risk for deposits(High Temp and under load) the motor is in DI mode, and you are getting ZERO washing of the valves from the fuel.

It does not remove the need for a catch can. Heck some of the most powerful Port injected motors on sale today come with them(Some Hellcats), and are highly recommended in many port injected applications also. The port injectors even being used sometimes does help to decrease the buildup of deposits, but does not remove the risk. A catch can prevents the majority of what causes the deposits from ever getting to where it can cause them. PERIOD. A catch can is NOT about the short term, but the long term.
Cool! Good to know.
 

MxRacer965

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Installed J&L catch can before running out the door on vacation. I routed the line into the PCV as they show. The intake I ran under the wiring harness for the cam phasers, etc instead of on top. Seemed less likely to rub and cause a problem long-term.
 

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