Krank vent mod ?

[Fav40]

Ok I've run a krank vent on my last 2 Yamaha Yzf-R1 motorcycles. Put 40k miles on the first one and have 20k miles on my current one. They seem to work, quiet the motor, never burn any oil etc.

Never thought to try it on my 2000 Silverado with the 6.0. The 5.7 motor in the Ram trucks has the internal PCV system. So I can't put one there. I installed it in the line coming from the filler cap to the airbox. It causes negative crank pressure.....or vacuum. After the motor has been running or while it's running there is a vacuum. Removing the line, the filler cap or dipstick breaks the seal and you can hear suction. Supposed to seal the rings to the cylinders for better bottom end, response and emmisions.

I removed it today to see if I have gained mpg's or not in the last 600 miles. Just wondering for those with motor knowledge your thoughts.

http://www.et-performance.com/

http://www.stealth316.com/2-krankvents.htm

[Quick]

Lol. Did you read that second link you posted. Pretty good explanation of a PCV system and where the Krank vents go and what they're supposed to do. Unfortunately he didn't give any rational explanation for the performance/ring seal/emissions claims...

The ONLY thing I can see as a benefit of these would be for blown applications or if your engine has a tendency to "burp" oil through the intake side of the PCV system -- small amounts of oil could end up being sucked into the manifold through the throttle body. Not really an issue in any engine that I've heard of. On the Hemi's the intake tube runs right down the oil filler tube. I believe that if you overfill/spill oil while filling you can get some oil in that tube that might be sucked into the intake. No big deal really.

Maintain vacuum in the crankcase at all times? Even with boost? That's crap. Kind of violates the laws of physics. Air gets sucked throught the crankcase by the vacuum generated in the intake manifold. If your engine is naturally aspirated (ok, maybe if you have some huge ram air scoop and are moving pretty fast, but probably not) then there will always be at least a slight vacuum in the intake manifold. Vacuum in the intake manifold will generate vacuum in the crankcase. If the vacuum from the intake manifold is very small and you have really bad blowby then I suppose you could get a slight positive pressure in the crank case. If you do get a positive pressure in the crank case then it's probably going to exit through the PCV valve and the intake tube (which is connected to your air intake). Maybe a one way valve between the air intake and the PCV intake... but really, how much oil do you expect to be in that tube anyway?

Better ring seal?? gimme a break. How much vacuum do you think you can generate in the crankcase? and how much pressure do you think you get on the other side of the rings during combustion? ummm.... do you think that makes a measurable difference in the ring seal?

Better emissions?? How? Gasses/blowby in the crankcase have two places to go. Out throught the PCV valve or out through the PCV intake. Both of those lead to the intake manifold. I'm not getting how your emissions are effected.

Now with a blown application (generating positive boost) you're going to be reversing the PCV flow IF your PCV valve doesn't seal correctly (maybe it time to replace it?) and you could be "burping" oil or blowing vapors into the intake through your throttle body instead of through your PCV catch can IF you have a PCV catch can. Maybe the one-way valve could be a benefit between the PCV intake and the air intake.

If it's a quality part then it could make a better PCV valve that you wouldn't have to replace... but how often do you need to replace your PCV valve?

Just some random throughts that came to mind. I could have missed some important facts on how everything works.

[Fav40]

Quick I know you're a guy with knowledge. I'm not trying to sell anything here. Folks use it on their motorcycles with good results.

The Hemi motor'd cars could use the Krank Vent system WITH a catch can. Hemi trucks can't due to the internal PCV system. I don't know. I'm going to send this link to someone who might be able to better explain. I just find it funny that some many folks will spend countless dollars on various add-ons, but won't try this.

Maybe it would eliminate knock due to oil ??????

[Quick]

Quick I know you're a guy with knowledge. I'm not trying to sell anything here. Folks use it on their motorcycles with good results.

Maybe it would eliminate knock due to oil ??????

haha, I subscribe to the "if you can't impress them with knowledge, dazzle them with BS"

It sounds like a better quality PCV/one-way valve. I'm not sure if blown applications overpower the "one-wayness" of stock PCV valves. Seems like people have problems with crankcase pressurization when they go over like 12-15 lbs. boost. Sounds like most pcv valves might leak pressure backwards when you go over that.

But there isn't anything about it I can see that would reduce the amount of oil through the PCV system. I suppose there could be some indirect effect from crankcase pressurization and the ring seal thing and oil going by the rings directly into the combustion chamber? Although I'd think the effect of that would be blowby and more exhaust gas or charge going into the crankcase (but not more oil through the pcv system).

I'm not saying it's not a fine product. It's just that I'd like to know how it does what they are claiming and how it would do anything for our particular problem.

[Fav40]

Not sure. I'll let him answer. I can tell you this.... It does pull some wicked vacuum at idle on the Hemi.

Here is an install on a motorcycle. http://www.r1-forum.com/forums/showthread.php?t=205718

[Quick]

Yea, great. You know, the more "evidence" I read the less impressed I am. There is this common thread in every testimonial and evaluation. Absolutely no measurable objective gains but some to huge subjective gains... and the patent is for a PCV valve -- apparently a a sensitive one at that that must be kept clean? to operate properly. From that last link this is from a post by the makers.

Good install photos! MOTORDOC here, we make the KrankVent @ Krankvent.com.
Was going over install info & wanted to update.
First, the KrankVent MUST be located high, off of the crank case. At high rpm, oil is flung into the CC vent line & if the KV is near the vent, the oil sits on top of the very sensitive valve & tends to hold it closed. Mounting the KV high, 10 to 12 inches above the CC vent, allows the oil, & condensed vapor, to return to the CC. If you use a small filter, it must be kept clean so it breathes. Filter not necessary unless in dusty conditions as no air is allowed 'in" only out!
This was 'discovered' working with a race team with 8 race bikes shipped to races worldwide. They didn't want the added weight of 12 inches of hose! Finally convinced them to do the above, they stuffed the KV into an OPEN catch can. Result: 3 days of engine dyno testing, NO oil in catch can, zero! The dyno didn't show much increase in HP at 10,000+ rpm BUT when engine installed, on the track, engine was very smooth, acceleration was fantastic! Rider could exit turns much earlier, harder, faster, with total control!! The team took ALL remaining races by at least half a lap & was protested every race! When judges got to the KV in the CC & asked "what's this?" reply was a PCV Valve (that is what the patent is for) the judges gave it a pass, as they should.

[DRASTIC.]

venting crankcase pressure is an old, and effective method.

redoing my srt-4 setup and will have 4 -10 lines venting off the valve cover into a puke tank, w/ 1 -10 line coming from the oil return acting as a pressure release and a oil return from the tank when the car is off, w/ 2 breathers on top the tank for crank case ventilation. of coarse, this is a lil unnecessary for an avg. car, but for an allout race car 4 lines is sufficient.

get rid of the pcv system and use the breather setup as stated above or use the exh ventilation method w/ the checkvalve.

[Fav40]

Here's a "quick" thought.....

spend $100 bucks and try it on your Hemi cars with a standard PCV system and test the oil usage ?

[Quick]

I'll be the first one to do that as soon as someone tells me how it functions any differently than any other PCV valve on my engine...

You said "I can tell you this.... It does pull some wicked vacuum at idle on the Hemi.".

Ummm, really? how much? and where did this "extra" vacuum come from? Those are the kind of things I wonder about.

[Fav40]

Ok fair enough. I'm told, by the maker of the KV, that car makers/engine manufacturers still don't know how to vent a motor right. Emissions improve too with the KV installed.

I'll try to get some video together of the KV installled and no other mods this week. It's quite imressive the vacuum that is caused by this. Now keep in mind the Ram Hemi's can only do 1 KV since the PCV system is internal. I'm curious how it works on the Hemi cars with 2.

Stay tuned....

[Quick]

Ok fair enough. I'm told, by the maker of the KV, that car makers/engine manufacturers still don't know how to vent a motor right. Emissions improve too with the KV installed.

Maybe the car makers don't... but let's think about that for a bit. They only have the best and latest technology in the world and plenty of money behind it for R&D. So if you actually believe they don't know because they're stupid or in the dark, I got news for you. Lets think about the cost motivator. They're always fighting to get emissions down and the EPA off their backs.... Oh wait, you said "Emissions improve too with the KV installed."
Really?
How much?
I thought the KV was supposed to improve crankcase ventilation. Wouldn't that just get more emissions out of the motor? or is this like the increased vacuum?

Sorry, I got off track. Let's make the dubious assumption that the car makers don't know how to vent a motor. But the KV certainly isn't changing anything there is it? Nothing is routed differently, nothing is ported differently, There's no powered vacuum pump in the KV. There aren't even any "turbo" vanes in there like the Jet throttle body spacer.

I'll try to get some video together of the KV installled and no other mods this week. It's quite imressive the vacuum that is caused by this.

Does your camcorder have a builtin manometer? are you going to measure the vacuum difference on tape? Manometer stock, manometer KV?

Now keep in mind the Ram Hemi's can only do 1 KV since the PCV system is internal. I'm curious how it works on the Hemi cars with 2.

We should be careful, if we put 4 or 5 of those things in a row the vacuum might create a black hole. The engine generates a certain amount of vacuum. The KV isn't powered or parasitic. But the KV increases the vacuum. We may have fallen upon the elusive perpetual motion machine?

Stay tuned....

With great anticipation.