[Ryephile]

^^^Yes, you already posted that. Let's see the datalog that corroborates no heat soak or timing pull, a true apples-to-apples comparison.

[2SSAustin]

Yep this was a big problem in my Audi S4. The 3.0 TFSI engine was baaaaaaad for gunk buildup on valves, Let the car warm up and drive it and try go farther than 5 kms a trip and dont ***** foot it

[mdhopt36]

Not sure my butt dyno would notice. (?)

[Mountain]

Originally Posted by DaveC113

You're arrogant AF, think you know everything, LOL... You have no idea who you're talking to on here buddy. But I can tell you, if some of the $hit you say on here was an IRL conversation you'd look like a complete idiot. Some of us here might just be engineers involved in designing the things you think you know so much about. Lol...

For all those thinking you NEED a catch can on a stock motor that is mostly street driven and are willing to risk your warranty over it... you think you know better then the engineers who designed the motor? All of your ideas are based on conspiracy-esque theories, it's just ridiculous.

If you spoke to Ryephile “IRL” the nicest way I’ll put it is that you’d be “humbled”.

I’m sorry, but I have to say your comments about engineers on here and your defenseive statements against people presenting engineering knowledge and/or data is ironic in that it clearly indicates your standing and understanding...

With DI, valve deposits come from two major sources: 1. oily vapor and 2. particulate flow-back

To my knowledge, DI is good for creating a very closely controlled homogeneous mixture, but is susceptible to a less complete atomized mixture at times.

The oily vapors originate from crankcase oil vapor/blowby vapor. The PCV system deals with these vapors. A PCV system consists of a “clean-side” and a “dirty-side” circuit.

The “catchcan” system that is factory to the Camaro LT1 is on the clean-side of the crankcase ventilation circuit. Can you guess why it’s called the “clean-side”?

The dirty-side, where the PCV valve is, and the circuit that connects post TB is not dealt with from the factory. Why? NOT because it doesn’t need to or shouldn’t; it’s because there isn’t a cheap, easy, non-general-customer-impacting solution. Can you guess why it’s the “dirty-side”?

The particulates from flow-back comes from exhaust and is nothing new in an ICE. But why the sometimes poorly atomized mixtures? Well, consider the time the fuel gets to mix with air being the injection point at the last point before combustion (in the camber). The point isn’t that this is exclusive to DI (it isn’t) - it is that it is there, DI still has limitations and it is a contributor to dirty valves.

This is where PFI+DI comes in ($$+complexity).

With the two sources in mind, since you simply don’t have the fuel physically in the needed location to act as a cleaning agent, you then need to focus on the PCV system (also the simpler area to attack).

Besides dirty valves, what do you think oily air does to combustion?

[JamesNoBrakes]

Originally Posted by DaveC113

For all those thinking you NEED a catch can on a stock motor that is mostly street driven and are willing to risk your warranty over it... you think you know better then the engineers who designed the motor? All of your ideas are based on conspiracy-esque theories, it's just ridiculous.

Well, to be fair, the goal of the company is to sell cars and make $$$. I have serious doubts whether all the electronics of modern cars will be still working in 10-15 years, but that's not the point, the point is to sell cars today and now. If it were designed perfectly, it'd have things like oil drain valves where we just turn a petcock valve and then the oil filter would be at the top of the engine and removable by hand (some new subarus/toyotas have this). The point is the engineers design the car to meet a pricepoint, not to engineer the perfect machine.

[6spdhyperblue]

Just broke the seal. 60,000 miles was bone stock. Change the oil per the dic

It’s fine. Car kept getting faster with age. Car ran approximately 118mph with only a 26” dr right before I took off the manifold. Until it starts actually effecting something, I’m not going to worry about it.

[DaveC113]

Originally Posted by Mountain

A PCV system consists of a “clean-side” and a “dirty-side” circuit.

Can you guess why it’s called the “clean-side”?

Can you guess why it’s the “dirty-side”?

Besides dirty valves, what do you think oily air does to combustion?

Can you be more pedantic and condescending?

You and rye should get a room together, jeesh!


I'd guess you're both young, inexperienced engineers from the way you talk down to everyone.

[98_Camaro]

Originally Posted by Nicul15

Just broke the seal. 60,000 miles was bone stock. Change the oil per the dic

It’s fine. Car kept getting faster with age. Car ran approximately 118mph with only a 26” dr right before I took off the manifold. Until it starts actually effecting something, I’m not going to worry about it.

That's interesting. Just out of curiosity, what's your commute like? I only live a couple miles from work, so I'm worried about buildup by virtue of the engine not getting hot, but it's not like I don't let it rip on the weekends either...

[Emoto]

Originally Posted by Nicul15

Just broke the seal. 60,000 miles was bone stock. Change the oil per the dic

It’s fine. Car kept getting faster with age. Car ran approximately 118mph with only a 26” dr right before I took off the manifold. Until it starts actually effecting something, I’m not going to worry about it.

Thanks for sharing that!

[SnakeEyeSS]

Originally Posted by Nicul15

Just broke the seal. 60,000 miles was bone stock. Change the oil per the dic

It’s fine. Car kept getting faster with age. Car ran approximately 118mph with only a 26” dr right before I took off the manifold. Until it starts actually effecting something, I’m not going to worry about it.

Thank You for this. Actual experience/example with our cars, and plenty of mileage.

And no offence to anyone, but if you are trying to sell something, or even if you bought sonething, it's going to be harder to believe, as you may have monetary motivations for what you say. If we don't know you personally, and since we can't read your mind, there is always that possiblity someone has an agenda.(and humans almost always have an agenda, if making money or rationalizing a purchase)

[Emoto]

Originally Posted by SnakeEyeSS

Thank You for this. Actual experience/example with our cars, and plenty of mileage.

And no offence to anyone, but if you are trying to sell something, or even if you bought sonething, it's going to be harder to believe, as you may have monetary motivations for what you say. If we don't know you personally, and since we can't read your mind, there is always that possiblity someone has an agenda.(and humans almost always have an agenda, if making money or rationalizing a purchase)

Amen. That is why when I started this thread, I put "High Mileage V8 Owners" in the title, not "vendors".

[hotlap]

Originally Posted by Nicul15

Just broke the seal. 60,000 miles was bone stock. Change the oil per the dic

It’s fine. Car kept getting faster with age. Car ran approximately 118mph with only a 26” dr right before I took off the manifold. Until it starts actually effecting something, I’m not going to worry about it.

Thank you for this. Proof that a catch can is not needed. I think they pose a greater risk for doing harm than they do a benifit.

[Whocares05050]

Originally Posted by hotlap

Thank you for this. Proof that a catch can is not needed. I think they pose a greater risk for doing harm than they do a benifit.

What proof is 1 sample size? Do you know any other variables? Highway miles? Racing miles? I hope you are not a lab technician lol


What evidence do you have that a CC does harm vs does good? Added oil vapors in the intake system on DI engines not only lower octane levels but coat parts that will never be washed off with fuel. For this one picture I can show you others totally packed with carbon. It has so many variable like driving habits, types of oils, etc. If you don't want one then great, of you do then great. I am not sure why so many guys need to justify "not" having one.

[6spdhyperblue]

Originally Posted by Whocares05050

What proof is 1 sample size? Do you know any other variables? Highway miles? Racing miles? I hope you are not a lab technician lol


What evidence do you have that a CC does harm vs does good? Added oil vapors in the intake system on DI engines not only lower octane levels but coat parts that will never be washed off with fuel. For this one picture I can show you others totally packed with carbon. It has so many variable like driving habits, types of oils, etc. If you don't want one then great, of you do then great. I am not sure why so many guys need to justify "not" having one.

I would like to see the pics on ecotec/LTx totally packed with carbon with miles for comparison if you can post them up pls