Krankvents to reduce oil consumption

[s98d7fs]

Hey all -

I've recently installed these Krankvents on my Honda S2000. Basically they act as a high performance PCV system that creates a bit of a vacuum in the crankcase. In any event, they claim it adds 1-2 HP (laughable), but why I'm using them is for their ability to reduce oil consumption (which they have). I used to burn oil 1qt per 3000 miles, but over the past 1500 miles I've had them installed, I've burned about nothing.

What I am curious about though is there wouldn't be any negative consequences to using these Krankvents, would there? I am happy using them as it saves me the trouble and worry about checking my oil every few days to make sure the car hasn't drank half the sump capacity. I heard 2 theories about the pH of the oil changing and the seals being pulled into the engine if the vacuum was strong enough. Any comments/rationale behind those topics or any different ones?

 

[oakfloor]

Quote:

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Hey all -

I've recently installed these Krankvents on my Honda S2000. Basically they act as a high performance PCV system that creates a bit of a vacuum in the crankcase. In any event, they claim it adds 1-2 HP (laughable), but why I'm using them is for their ability to reduce oil consumption (which they have). I used to burn oil 1qt per 3000 miles, but over the past 1500 miles I've had them installed, I've burned about nothing.

What I am curious about though is there wouldn't be any negative consequences to using these Krankvents, would there? I am happy using them as it saves me the trouble and worry about checking my oil every few days to make sure the car hasn't drank half the sump capacity. I heard 2 theories about the pH of the oil changing and the seals being pulled into the engine if the vacuum was strong enough. Any comments/rationale behind those topics or any different ones?

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Yes they do work great,Im in the S2ki.com club, and they do use less oil with this mod.I have not read anything negative about them yet. Post this on S2ki.com and see if any feedback.

 

[s98d7fs]

Well, I've gathered that everyone that's used them on s2ki.com is happy about reducing oil consumption. But I'm definitely interested to see if anyone on here has some experience/information regarding the use of these Krankvents during a normal OCI (7500mi) and even over the course of vehicle ownership. Or even insight as to any pitfalls about creating a vacuum in the crankcase in a daily driven car.

 

[Aldaris]

After reading the terribly designed webpage about the Krankvents I still don't know how they work. Do they draw vacuum from the brake booster line and then keep the oily residue from entering the engine somehow? Is it a fancy check valve?

 

[Wrehch]

Can't say I like their webpage either. How do they work?

Caterpillar recently came out with a crankcase breather setup for diesel engines that does away with the old draft tubes. It's a little box you retrofit onto the side of the block, catch's the oil vapor/mist and then redirects the oil back into the oil pan. I don't see what the Krankvent does with the oil.

 

[moribundman]

The Krankvents appear to work in a similar fashion as the float valve (no traditional PCV valve) in my Audi's intake plenum. The float valve opens and closes depending on vacuum (low pressure).

 

[s98d7fs]

mori and Aldaris hit the nail on the head. The Krankvents are just check valves that open/close to maintain a crankcase vacuum.

The oil vapor that would be expelled through the vents is routed back into the intake manifold to be burned. That part of it is no different from the traditional PCV setup (on the S2000). The traditional setup involves 2 breather hoses on the valve cover. One hose has a PCV valve, whereas the other is just connected to the air intake (before the throttle body). The Krankvent setup is the same except for the check valves (designed to operate faster than PCV valves to maintain a vacuum) on both those hoses.

 

[s98d7fs]

So I take the silence to mean that there's no drawback to using these? If so, thumbs up

.

 

[ShiningArcanine]

At $110 each, these would be very expensive to replace, so I am curious, do krantvents ever need to be replaced like regular PCV valves?

 

[s98d7fs]

No, they don't need to be replaced. On the website's FAQs they explain that the Krankvents use a mousetrap valve and the valve material is not at all affected by gas, oil, alcholo, solvents, etc. And they even say that the Krankvents are guaranteed forever... (so long as the company is still around, right

)

 

[benjamming]

Will they not gum up? A guarantee is worthless. What is their warranty?

 

[ShiningArcanine]

Has anyone tried this in a Toyota 1MZ-FE engine? I am reading at sk2i that these tend to cause popping/squeaking in Honda engines and I would not be comfortable spending $110 on an aftermarket PCV upgrade, only to have to buy new hoses and reinstall the old PCV system because the upgrade caused a popping/squeaking noise.

 

[s98d7fs]

Quote:

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Will they not gum up? A guarantee is worthless. What is their warranty?

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If they break/gum up, they'll replace em. That's my interpretation of a guarantee. I've heard of one case of the valve failing on a supercharged S2000; it was speculated that an intake backfire caused the valve to fail. The Krankvent was replaced at no charge.

To ShiningArcanine - The pop/squeaking sound was determined to be the valve cover spark plug tube seals being pulled into the engine and releasing the vacuum a little. Bit of an annoyance, but more so was the oil burning. I heard some discussion as to a solution for it. Some folks mentioned putting white lithium grease around where the seals meet the spark plug tube. Not to fond of putting lithium grease into the engine like that though... Need to come up with a lube that'll stick around that's oil/engine friendly

.