Krank Vent -- worth it
12-20-2006, 08:08 PM
#43
Le Mans Master
I just installed mine on the car last night and gave it a test drive. I saw the same thing you did Bill, except for instead of getting a noise, I got a HUGE puff of smoke when I let off. It went away after 3-4 seconds of cruise. Something has to be done to modulate the vacuum somehow. Not sure what the right solution is but the car is not happy with that much vacuum in the crank case.
I'm still happy with the valve though, it opens easily and flows a ton of air. The overall system will need more than just a couple of KVs though.
I'm still happy with the valve though, it opens easily and flows a ton of air. The overall system will need more than just a couple of KVs though.
Bill
12-20-2006, 08:08 PM
#44
Le Mans Master
Bill
12-20-2006, 08:12 PM
#45
Drifting
I purchased the krank vent system based on this post...
The loud screeching under high vac conditions scared the crap out of me.
It seems obvious that the valve attached to the V/C breather line is too restrictive on my LS1.
Will it damage the engine/seals? I'm going to let you guys figure it out.
I personally could not live with the racket even if it did have some benefit.
It might be wise to purchase the larger system. It may provide enough flow to keep the vac to a reasonable level.
The one I have I believe does not flow enough air compared the the factory setup.
Keeping adequate air flow through the PCV is more important long term than a questionable increase in performance, IMHO.
I feel like I basically paid $110 to prevent my crakcase from being pressurized.
The loud screeching under high vac conditions scared the crap out of me.
It seems obvious that the valve attached to the V/C breather line is too restrictive on my LS1.
Will it damage the engine/seals? I'm going to let you guys figure it out.
I personally could not live with the racket even if it did have some benefit.
It might be wise to purchase the larger system. It may provide enough flow to keep the vac to a reasonable level.
The one I have I believe does not flow enough air compared the the factory setup.
Keeping adequate air flow through the PCV is more important long term than a questionable increase in performance, IMHO.
I feel like I basically paid $110 to prevent my crakcase from being pressurized.
12-20-2006, 08:29 PM
#46
Le Mans Master
I purchased the krank vent system based on this post...
The loud screeching under high vac conditions scared the crap out of me.
It seems obvious that the valve attached to the V/C breather line is too restrictive on my LS1.
Will it damage the engine/seals? I'm going to let you guys figure it out.
I personally could not live with the racket even if it did have some benefit.
It might be wise to purchase the larger system. It may provide enough flow to keep the vac to a reasonable level.
The one I have I believe does not flow enough air compared the the factory setup.
Keeping adequate air flow through the PCV is more important long term than a questionable increase in performance, IMHO.
I feel like I basically paid $110 to prevent my crakcase from being pressurized.
The loud screeching under high vac conditions scared the crap out of me.
It seems obvious that the valve attached to the V/C breather line is too restrictive on my LS1.
Will it damage the engine/seals? I'm going to let you guys figure it out.
I personally could not live with the racket even if it did have some benefit.
It might be wise to purchase the larger system. It may provide enough flow to keep the vac to a reasonable level.
The one I have I believe does not flow enough air compared the the factory setup.
Keeping adequate air flow through the PCV is more important long term than a questionable increase in performance, IMHO.
I feel like I basically paid $110 to prevent my crakcase from being pressurized.
Bill
12-20-2006, 08:31 PM
#47
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Figure it out we will.
At a minimum, the KV is beneficial in line with the OEM PCV valve as it will not allow the PCV valve to see boost. We know that the OEM valves like to leak under boost pressure. So that side of the PCV is solved. Now the issue is, how to allow mild vacuum on the crankcase without getting so much that you're worried about odd noises or engine seals. I don't know the answer to that, yet.
Even no vacuum on the crankcase at all would be OK if there was a way to do that and allow the second KV to be the only path out of the crankcase when you're under boost. To me this is the most important aspect of the KV. I don't want to run a breather that stinks up the cabin all the time -- I want to figure out a way to run a hose off the valve cover to the secondar KV and down to the bottom of the car, so any crankcase gasses and any oil escape without making a mess in the engine bay or causing a stink.
Oh, I don't think the larger kit would help any, the actual issue is excessive vacuum -- not excessive pressure. And Quick has noted that pressure was relieved quickly enough with the ordinary/smaller KV.
At a minimum, the KV is beneficial in line with the OEM PCV valve as it will not allow the PCV valve to see boost. We know that the OEM valves like to leak under boost pressure. So that side of the PCV is solved. Now the issue is, how to allow mild vacuum on the crankcase without getting so much that you're worried about odd noises or engine seals. I don't know the answer to that, yet.
Even no vacuum on the crankcase at all would be OK if there was a way to do that and allow the second KV to be the only path out of the crankcase when you're under boost. To me this is the most important aspect of the KV. I don't want to run a breather that stinks up the cabin all the time -- I want to figure out a way to run a hose off the valve cover to the secondar KV and down to the bottom of the car, so any crankcase gasses and any oil escape without making a mess in the engine bay or causing a stink.
Oh, I don't think the larger kit would help any, the actual issue is excessive vacuum -- not excessive pressure. And Quick has noted that pressure was relieved quickly enough with the ordinary/smaller KV.
12-20-2006, 08:32 PM
#48
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Couldn't agree more. These KVs do what they say they will and are really amazing. The problem is our motors don't like vacuum. We'll figure it out.
12-20-2006, 09:20 PM
#49
Drifting
I still think its a bit silly to think the vacuum is benefical since it will only be present under light to no load conditions. As soon as the boost gauge moves, its over.
I think the only way your going to get rid of the smell from blowby is to rig a charcoal cannister(or air freshener) to the the end of the vent line.
For anyone else reading, the catch can is still going to be needed if you want to keep the oil out of the intake.
12-20-2006, 10:17 PM
#50
Le Mans Master
Bill
