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Possibly... The other thing that comes to mind concerning vac tubes is velocity. The smaller the tube the quicker that air volume will want to move as the force increases.

You can slow things down by increasing orifice and line size and/or increase the number of lines that are pulling vac. The slower all of that air moves, the less oil vapor will be picked up and allowed to escape through your breathers.

I might look into a way to slow that air down to keep the oil vapor inside of the catch can.
 
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Once I'm done with my fuel line insulation business, I'm going to fire the car up with the lower intake capped to see how the vapor situation is at idle with just the two 12an lines from the valve covers. I removed all the breather lines over the weekend to replace with nylon hoses. The valve cover lines didn't smell like much, but the lower intake line had a strong oil/fuel smell. I think that's the line to blame, but I'd like to know for sure.
 
I read a discussion on yellowbullet with some of the best engine builders in the world talking about best places to pull crankcase vacuum, they all pretty much said they like the idea of using the valley plate on a lower intake, but it takes a TON of work to not get oil in the hose. Ditch that hose and i bet you will be good.
 
You're probably right that ditching the lower intake hose will eliminate the huffing at idle. Nick voiced the same opinion.

Here's my question though. What effect will that have on my oil life and oil quality? Breathers on a race car that gets oil changes every week is fine, but what negative effects will that have on a street car. Those hydrocarbons aren't being pulled out of the oil so they hang around in the crankcase and eventually turn to blow by in the oil. The car will see 2k miles a year at best. Should I be changing my oil every 500 miles? 1000 miles? I just want to be sure I'm not prematurely wearing my engine internals if I can avoid it.
 
Do you have a link to said super terrific catch can?
I'm sure the huffing vapor you're talking about is the same vapor I seem to have. Although I still have a break in to get past, I'm wondering how bad of an idea it is to run a very small "t'd" hose back into the intake tube before it gets metered to suck back some of the vapor for the sake of burning it?

I know that too much will be a bad thing and could compromise the intake mixture, and lead to possible detonation, but consider this: Once it gets on boost anyway, that tube is no longer allowing anything to come into the intake stream that used to be vacuum based, especially if you put a one way valve in the t'd line. it's the other path to trying to suck it out into the exhaust flow when there may not be enough velocity at idle to create a vacuum to do it, and one I'm considering doing.
 
You're probably right that ditching the lower intake hose will eliminate the huffing at idle. Nick voiced the same opinion.

Here's my question though. What effect will that have on my oil life and oil quality? Breathers on a race car that gets oil changes every week is fine, but what negative effects will that have on a street car. Those hydrocarbons aren't being pulled out of the oil so they hang around in the crankcase and eventually turn to blow by in the oil. The car will see 2k miles a year at best. Should I be changing my oil every 500 miles? 1000 miles? I just want to be sure I'm not prematurely wearing my engine internals if I can avoid it.

Here's the question in reverse, todays cars with idiot oil change indicators can run 10,000 miles between algorithm'd changes. These cars run twin mini turbos with same oil return to intake breather lines. The motors outlast the cars at 100's of thousands of miles. Oil in your car over the winter collects moisture with nonuse. Are you not going to change it seasonally?
 
You reminded me of a thought I was having. My girlfriend's Focus ST has over 20 psi of boost being shoved into the cylinders. That's from the factory, so I'm curious what Ford did with that engine to handle those boost levels while keeping the car emissions compliant. I may be comparing apples to oranges, but I'm still curious.

I'll probably be changing the oil on the car twice a year.
 
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I'm sure the huffing vapor you're talking about is the same vapor I seem to have. Although I still have a break in to get past, I'm wondering how bad of an idea it is to run a very small "t'd" hose back into the intake tube before it gets metered to suck back some of the vapor for the sake of burning it?

I know that too much will be a bad thing and could compromise the intake mixture, and lead to possible detonation, but consider this: Once it gets on boost anyway, that tube is no longer allowing anything to come into the intake stream that used to be vacuum based, especially if you put a one way valve in the t'd line. it's the other path to trying to suck it out into the exhaust flow when there may not be enough velocity at idle to create a vacuum to do it, and one I'm considering doing.
I'm also curious about a lack of exhaust velocity at idle, especially in a 3.5" downpipe. But then again that single pipe is doing the job for the entire engine, so the exhaust speed may be high enough to do something. It's only purpose will be for idle and cruise because exhaust backpressure will probably be too high at larger engine loads and the check valve will kick in. That's where the open breathers would do their job.
 
eco-boost, single turbo, twin turbo - Score one for EPA mpg guidelines, we get fun quick cars with boost as a side benefit :nice:

One of the guys who built my car got a 2015 boosted Focus, dang quick car and fun too.

Twice a year should be plenty I'd think
 
i change mine every 500-1000 miles, with as much money as we put into these things, there is no reason to be trying to get a bunch of time in between oil changes. I dont think you will ever have a issue even if you did oil changes once a season at 2000 miles
 
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You're right. It costs me $25 to change the oil with a filter. I know I can't expect a high performance setup like this to go 10k between oil changes, I just wanted to make sure I'm not causing long term reliability issues. I should probably just stop over thinking it and plug the lower intake and call it a day.
 
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@Noobz347 Ask and ye shall receive...


View: https://youtu.be/C7hiA-nQG5o

If you couldn't tell, I opened the exhaust cutout slightly when I reached under the dash. It really wakes the car up. Does the same to the neighbors too, especially when it's open all the way. Hah!

Why aren't you in the video? Why can't we see the road rushing at us? Why don't we get to see the tach and speedo? What kinda noob would post this amateur video anyway?

My take on the above:

1. It's not you doing the driving. The car scares you, so you have your " boy" row the gears for you at any speed other than " Going to the Walmart".
2. You don't want us to get car sick.
3. You're not sure that your analog gauges will display properly on digital monitors.

You don't fool nobody.
 
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