Do I really need a catch can

[TGGT]

Although I am a fan of catch cans and breathers, the fact that your cylinders look like that is why you have so much excessive oil buildup on the valves. Your cylinders arent sealing properly so it's pushing more oil than usual through the PCV.

That’s definitely a possibility, though I kind of doubt it. I may do a leak down test just to confirm. Even with a great seal from the rings 8 pistons are going to develop quite a bit of crankcase pressure

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[TGGT]

Jlt cc ordered. When I get it I’ll sea foam what I can off the valves. Probably just going to run this motor for a while. If a tsb comes out or it breaks than I’ll think about a trip to the dealer. It makes some noise, but runs like a straight beast!

 

[TGGT]

I am bewildered . Did Ford port inject the 302 for 2018 or not . Also there is supposed to be a redesigned baffle plate .

Wait . Start using an additive to your gasoline like Redline . Change that oil out . Your running catless and headers so your back pressures are increased . Check valves and CC . ....GOOD LUCK ..

The 2018 coyote is port a direct injected. My oil is fresh . Less than 100 miles. I’m not a fan of any fuel additives, and catless & headers = less back pressure. Thank you for the well wishes though

 

[Brian V]

The 2018 coyote is port a direct injected. My oil is fresh . Less than 100 miles. I’m not a fan of any fuel additives, and catless & headers = less back pressure. Thank you for the well wishes though

You have it wrong . It is the velocities that creates back pressures and there air 2 of them . Just because you eliminate the cats and add headers does not equal a flow that evacuates the exhaust . Those valves are telling me that .

 

[DoubleX]

I'm not sold on the necessity of these things. Do any of the major automakers sell cars with these included?

 

[CEHollier]

I'm not sold on the necessity of these things. Do any of the major automakers sell cars with these included?

Some cars have oil separators. Catch cans require maintenance. Do you think the average American will do that?

 

[BlueThunder]

Some cars have oil separators. Catch cans require maintenance. Do you think the average American will do that?

There are likely hundreds of things auto manufacturers should put on their new cars, like a catch can, but it's obviously not something where the extra oil and water vapor can cause major damage or hurt performance enough to warrant it. And, as you said, most folks picking these up will just do the required oil change, and nobody, including Ford or outside has ever mentioned the can I had on my '15. Hell, you can get the dealer to throw a blower on your brand-new car before you pick it up, and they won't even mention OPGs or half-shafts.

It's an enthusiast mod for people who drive the car like an enthusiast.

 

[CEHollier]

It's an enthusiast mod for people who drive the car like an enthusiast.

I could not agree with you more.

 

[gj]

I'd really like to see a borescope valve pic from someone with a catch can since new
That would really shed some light on if they are worth having

 

[bootlegger]

A catch can isn't going to prevent that. Sounds like you were running E85 for quite some time. E85 has very poor detergency, as only the 15% gasoline is actually treated with detergent. Ethanol is a solvent, so it should actually clean things up. However, the corrosion inhibitors used in the ethanol are known to cause intake valve deposit. It is my suggestion is that you either run a full tank of high detergency 93 octane E10 (like Shell or Chevron) every once in a while, or add an ethanol friendly detergent additive to your tank. I believe PEA (Polyetheramine) is ok in ethanol.

BTW, I don't see a need to have a catch can, unless you are boosting. The stock engine has been thoroughly tested, and if blow by were an issue, it wouldn't make it through validation. IVD and injector deposit buildup is almost always an issue with poor fuel quality or low detergency.

 

[Ebm]

A catch can isn't going to prevent that. Sounds like you were running E85 for quite some time. E85 has very poor detergency, as only the 15% gasoline is actually treated with detergent. Ethanol is a solvent, so it should actually clean things up. However, the corrosion inhibitors used in the ethanol are known to cause intake valve deposit. It is my suggestion is that you either run a full tank of high detergency 93 octane E10 (like Shell or Chevron) every once in a while, or add an ethanol friendly detergent additive to your tank. I believe PEA (Polyetheramine) is ok in ethanol.

BTW, I don't see a need to have a catch can, unless you are boosting. The stock engine has been thoroughly tested, and if blow by were an issue, it wouldn't make it through validation. IVD and injector deposit buildup is almost always an issue with poor fuel quality or low detergency.

+1 to that


Some people that own catch cans act like it's the best thing since sliced bread yet it isn't even proven to do anything. Great, you have a little bit of liquid in a cup. How does that prove it's needed?

 

[bootlegger]

These should be good for E85.
http://www.stp.com/products/fuel-additives/Direct-Injection-Fuel-Injector-Cleaner

https://cglapps.chevron.com/msdspds/PDSDetailPage.aspx?docDataId=373468&docFormat=PDF

 

[TGGT]

So I’ll take some pics this week of the inside of the intake manifold so everyone can see first hand the sheen of oil that is covering it. It is coming from the pcv line. Perhaps others are having problems with deposits forming from other sources, but that is not the case with my car. What will be interesting to see is that after I get my catch can I’m going to run a can of sea foam through it. I’ll take some pics of the valves afterwards to see if it does anything

 

[bootlegger]

So I’ll take some pics this week of the inside of the intake manifold so everyone can see first hand the sheen of oil that is covering it. It is coming from the pcv line. Perhaps others are having problems with deposits forming from other sources, but that is not the case with my car. What will be interesting to see is that after I get my catch can I’m going to run a can of sea foam through it. I’ll take some pics of the valves afterwards to see if it does anything

Oil on the intake manifold is normal, within reason. Without an analysis of the full deposits, you can't know for sure the root cause. Certain deposits have high polarity, and after building up, other things like oil will get stuck on those deposits. Oil should be easily removed with fuel detergents. The fact that there is deposit buildup in such a short time tells me that 1. you aren't getting proper detergency to the valves and 2. there is a deposit forming biproduct in the E85. If you spray straight E85 (no corrosion inhibitors) on intake valves, it would take a massive amount of oil to overcome the solvency of the ethanol. My last company specialized in this sort of thing. We tore hundreds of engines apart, and not a single one had a catch can. Valves were always clean when you had proper detergency. We have quite a few patents on preventing this. https://patents.google.com/patent/US20080202561

Don't get me wrong. If you want to buy a catch can, and it will make you feel better, go for it. There may be a very minor improvement in FE. I just don't think this will solve your deposit buildup issue. It's a lot easier to run a detergent once in a while, IMO.

 

[Draklia]

I don’t think a catch can does much for engine protection, I was against buying one but ended up with one anyway. Once I put the Procharger on my car I had oil coming out of the head unit from the PCV system pluming the oily PCV air into the intake. Now with the catch can installed it barely comes out of the head unit anymore. Was an oily mess and now it’s much better.

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