PCV Exit As Vacuum Source?
Why would anybody desire blow by? The idea is to minimize it in the build, and then deal with it for as long as you need to run the engine. You can run an engine with poor sealing character and massive blow-by. High performance small displacement engines (2.6L) with large ring end gaps might pass a jug of oil on a 7 second pass, but we just catch it and dump it back in and make another pass until the head blows the hood off the car.
OEM engines should not produce significant blow-by, so in general, YES if there is BAD blow-by coming out of an OEM engine, then something is wrong, most likely rings or ring related since that is really the only place for combustion gasses to escape (examine the picture I posted above, the brown arrows floating around show where combustion gasses are coming from, and going to). There can also be a situation where the "check valve(s)" go bad, and this can simulate blow-by since it pressurizes the crankcase when the check valve goes bad. That is why adding additional check valves is never a good idea, more points of failure.
OEM engines should not produce significant blow-by, so in general, YES if there is BAD blow-by coming out of an OEM engine, then something is wrong, most likely rings or ring related since that is really the only place for combustion gasses to escape (examine the picture I posted above, the brown arrows floating around show where combustion gasses are coming from, and going to). There can also be a situation where the "check valve(s)" go bad, and this can simulate blow-by since it pressurizes the crankcase when the check valve goes bad. That is why adding additional check valves is never a good idea, more points of failure.
Oh believe me, they know, I've been exposed to the out of round bore engine situation, GM wont do anything about it apparently.
http://www.corvetteforum.com/forums/...post1590266523
http://www.corvetteforum.com/forums/...post1590538587
@hrcslam
http://www.corvetteforum.com/forums/...post1590266523
:iagree: Good info! One of the big challenges we C7 owners face through all of this is when excessive oil ingestion is experienced, (resulting in an eyebrow raising moment when emptying a catch can) GM does not want to start tearing engines apart to fix the issue. Proof of this can be basically seen as when you complain of this at the dealer they require you to take an "oil consumption test" where you log the oil level on the dipstick over the course of 5000 miles or so. Thats all and great but the issue I have with that is they clearly put on the document that consumption (burning OR ingestion) of a 1 quart of oil per 500 miles when the vehicle is used for hard acceleration is "NORMAL". I'm sure we can all agree to disagree with them on that. Its downright stomach turning that they consider that much oil loss "NORMAL" :ack:
Ant
Ant
http://www.corvetteforum.com/forums/...post1590538587
@hrcslam
I spoke to Mr. Mouse and have everything figured out. I'm going to use my breather on the passenger valve cover for now that's routed to the suck side of the turbo intake, but I'll probably get a hollowed out PCV valve and stick a breather on that later.
I just didn't realize that the PCV exit location could be used for the fresh air inlet based on my assumption of how everything flowed, but I understand it will sere the purpose well. Now time to get it tuned soon!
BTW, I found an awesome location to mount the can. I'll try to get some pics before she goes.
I just didn't realize that the PCV exit location could be used for the fresh air inlet based on my assumption of how everything flowed, but I understand it will sere the purpose well. Now time to get it tuned soon!
BTW, I found an awesome location to mount the can. I'll try to get some pics before she goes.
I'm liking MM's reasonings, they seem to match what I'm looking for out of a cc. Looking to buy from him soon.
Thread Starter
Launching!
Joined: Jul 2003
Posts: 258
Likes: 0
From: Rancho Cucamonga, CA
I mounted mine below the driver's side hood shock tower or whatever it's called towards the front of the engine bay. It fits perfectly and there's a hole in the bottom making draining easy. I'll try to take a closer pic tomorrow.
Thread Starter
Launching!
Joined: Jul 2003
Posts: 258
Likes: 0
From: Rancho Cucamonga, CA
Once I get this misfire nailed down and find a smog guy she will be. Haha
Here are a few pictures of my catch can install. I hope it helps! She's tucked nice and tight in there. No need for a mounting bracket. I put a little double sided tape on the bottom just to help it from scratching from the car.
Here are a few pictures of my catch can install. I hope it helps! She's tucked nice and tight in there. No need for a mounting bracket. I put a little double sided tape on the bottom just to help it from scratching from the car.
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Thread Starter
Launching!
Joined: Jul 2003
Posts: 258
Likes: 0
From: Rancho Cucamonga, CA
Thanks again snorkelface. Looks like we have the same bov, seems loud for my taste (loud and wide open at idle). Your cc location might be just where I'll put mine due to lack of space with all the blower crap everywhere.
Huntr that's a clean bay. Like the mounting bracket too.
You guys tap your valve covers yourselves? Is there a preference for which vc to tap? Could've sworn the ps one was the preferred, if not both???
Huntr that's a clean bay. Like the mounting bracket too.
You guys tap your valve covers yourselves? Is there a preference for which vc to tap? Could've sworn the ps one was the preferred, if not both???
Thread Starter
Launching!
Joined: Jul 2003
Posts: 258
Likes: 0
From: Rancho Cucamonga, CA
Just buy a weld-on bung from a parts store, then take it and your valve cover to a local welder. Shouldn't be more than $40-$75 for them to weld it on. Poking the hole through is the easy part. Haha
Not sure if there's a preference there since the stock valve cover already has a tap on top, that might be why it's more common. I would ask Mr. Mouse, but he didn't mention any preference when I told him I was going off the driver's side vc.
Not sure if there's a preference there since the stock valve cover already has a tap on top, that might be why it's more common. I would ask Mr. Mouse, but he didn't mention any preference when I told him I was going off the driver's side vc.
Thanks again snorkelface. Looks like we have the same bov, seems loud for my taste (loud and wide open at idle). Your cc location might be just where I'll put mine due to lack of space with all the blower crap everywhere.
Huntr that's a clean bay. Like the mounting bracket too.
You guys tap your valve covers yourselves? Is there a preference for which vc to tap? Could've sworn the ps one was the preferred, if not both???
Huntr that's a clean bay. Like the mounting bracket too.
You guys tap your valve covers yourselves? Is there a preference for which vc to tap? Could've sworn the ps one was the preferred, if not both???
Thread Starter
Launching!
Joined: Jul 2003
Posts: 258
Likes: 0
From: Rancho Cucamonga, CA
Sorry, I thought I had replied here with the pics. Here's my catch can mounting. fits and works great, plus it will be relatively easy to drain, even after adding the bottom panel back on.
*EDIT* I'm not sure why this site rotated the last picture, but the can is mounted upright.
*EDIT* I'm not sure why this site rotated the last picture, but the can is mounted upright.