^^^
I agree and yes, vacuum from the oil filler neck would be what you want to see. Restore the pcv system and see how bad the problem is. Also, yes, a leakdown test will show you which cylinder has rings that arent properly sealing.

 

The builder is installing a filter system that goes on the oil filler port. It should be done tomorrow. He says he has used this system on all of his engines with no problems. I am, to say the least, a bit skeptical. I think I would prefer that he do the LS1 to LS6 pcv conversion, but agreed to try this first. I have a lot of fumes in the cabin and I am afraid that moving this filter to the front will do little to help that with air bleeding into the engine space like that...oil or not. But, I'll see what this does and let you guys know tomorrow...

 

I have a breather filter on my cap but still have the pcv system in take. I would say to install the pcv system. You dont want to band aid an existing problem.

 

Your engine guy needs an education in basic engine theory! NO DOUBT ABOUT IT!

He doesn't have a CLUE ,,,,, OR,,,,,, hes stalling to keep from having to do the work correctly!

I'm telling you right now, (I bet you a cold one) NOTHING CHANGES.

Go to your car right now and pop off the OIL FILL cap with the engine running. What comes out NOW is what will come out tomorrow,, filter or no filter. When you hammer the throttle, MORE blow by will result and you will see the filter dripping oil after a while.

I have a 4 cyl 90 Jeep wrangler. Its my winter beater. It has 150,000 miles on it. The PCV system consist of a small brass fitting that fits into the valve cover. The fitting has a very small hole drilled thru it. Its like 0.030". The intake manifold takes a suction on the crankcase thru that little hole.

The rings had stuck in the ring lands due to past POOR Maintenance from previous owners and the engine had lots of blow by. So much so that the fresh air intake for the PCV system which draws air from the air box would puke so much blow by that it will fill the bottom of the air box with 1" of oil on a long trip "100 miles"

I soaked the cylinders with sea-foam over night and that took care of most of the ring issue issue. The rings were a bit weak and I still had a fair amount of blow by out of any crank case opening at idle.

I drilled out the PCV fitting hole to 1/8" and have NOT had one blow by problem since. The crankcase just needed that much more vacuum to overcome the piston ring blow by.

BC

 

Geez!! Seems me and my builder will have a long talk tomorrow to see where I'm at on all of this. I would really prefer the LS6 style system and suspected the same about the band-aid fix (nothing will change). I just need to have someone do the leakdown test to confirm there is a problem. Hopefully they don't charge me an arm and a leg to do it... I thought the same thing though.... The same gases will be venting through a larger filter closer to the front of the engine compartment....still a problem I think...

 

You are confusing crankcase scavenging for HP gain with OEM emmission controls.QUOTE=C5Natie;1576423320]Sorry bud that not correct. You want vacuum if the rings have sealed properly. Some guys even run vacuum pumps. You can always research the topic.

http://nutterracingengines.com/racin...uum_facts.html
HOW IT WORKS

The reduced pressure ("vacuum") in the crankcase is generated by having a substantial excess of scavenging capacity with respect to the engine's oil flow rate. The "vacuum" increases the pressure differential across the ring package, producing an improved ring seal. The improved ring seal allows the use of a low-tension (reduced friction) ring package, yielding a power increase as well. Further, the reduced crankcase pressure dramatically reduces windage losses at high RPM.
Here are a few observations we have made over the years of developing winning race engines. First of all, in most engines, the expected power gains will occur with 8 to 10 inches HG crankcase vacuum. Beyond that point, more vacuum does not generally produce any measurable power gain until (a) you get more than 20 inches HG of vacuum AND (b) you are operating in excess of approximately 8300 RPM.
However, we generally size the systems on our engines to produce around 14 "HG when the engine is fresh. That provides sufficient capacity so that as the engine wears and blowby increases, there will still be sufficient scavenging capacity to achieve the 8"HG minimum, and power does not drop off noticeably.
If you want to run a high level of crankcase vacuum (18 inches HG or more), there must be provisions in the engine to supplement the lubrication that used to occur when oil was being thrashed about by the moving parts ("windage"). There will likely be problems with at least wristpin and cam follower lubrication. The best solution will be the addition of piston oilers and, if your engine has a flat tappet cam, provisions for extra lubrication of the cam lobe-to-lifter interface will certainly be required. If you are trying to achieve over 18 "HG, you will need to install special crankshaft seals (front and rear) which have the sealing lips reversed to hold that higher level.[/QUOTE]

 

^^
If Im not mistaken the pvc just takes the gases from the crankcase to the intake to be burned in the combustion process. If you have good crankcase vacuum thanks to good rings and seals then you wont see that oil blow-by that the OP is seeing. The pvc system is almost like a tell-tale for those conditions. I guess thats what I was trying to say. If you were too add vacuum to the crankcase (via thru a pump as in the link I posted) you wouldnt see that blow-by...but it wouldnt fix the ring problem and you'd loose power because of the leak thru the rings. They are both related as in crankcase pressure wether negative or positive will affect or be reflected by the pvc system. Where do you think those gases come from?

 

The reduced pressure ("vacuum") in the crankcase is generated by having a substantial excess of scavenging capacity with respect to the engine's oil flow rate. The "vacuum" increases the pressure differential across the ring package, producing an improved ring seal. The improved ring seal allows the use of a low-tension (reduced friction) ring package, yielding a power increase as well. Further, the reduced crankcase pressure dramatically reduces windage losses at high RPM.

 

.....and the non "cut and paste" version.........

 

Your facts are for a RACE engines,and while the medium(vaccum) is the same,the purpose is for HP gains,NOT for vapor or emission control.

 

Okay.... Got the new part on the car the builder was talking about... It's just another breather/filter that replaces the oil cap instead and he capped off the spot he originally had my breather on.... Guess what?? No changes whatsoever! Still smoke puffing out of this breather. And it is definitely NOT condensation, but rather, smoke/fumes. In fact, when I turned on my heater, it came billowing into the cabin through my vents! So, not just a small "puff". The builder insists that everything with the engine is fine..so, I'm off today to find someone who will do a proper leakdown test for me without charging an arm and a leg so that I can PROVE finally whether or not something is wrong...once and for all. My stance is that the smoke is NOT normal and if there is something wrong...HE should fix it or give me a refund. So, I'm going to have someone else look at it and if I'm wrong and the car is fine, I'll let it go. If not....the car is going back.

 

Again,install a proper PCV sysytem,then if you still have issues go into checking the engine out.

 

Regarding the last poster.... I get that I need to have a pcv system and plan on doing the LS1 to LS6 conversion, regardless...but... Doesn't the fact that there is actually SMOKE coming out of the oil fill port under positive pressure indicate that something else in wrong internally anyway?? The reason I ask, is that if the engine needs to come apart, it's kinda pointless to do the mod and put it back together when I've got to have more work done than just the pcv system... right?? I want a functional pcv system anyway, but I'm just sure that with the amount of positive pressure and the smoke...I've got issues. I'm hoping to call around tomorrow and find someone to do a dry comp check, wet comp check and leak down test on all cylinders to put this to rest once and for all. I mentioned the other guys car that pulls enough vacuum that removing the oil fill cap is like opening a new jar of pickles and mine is just the opposite..... I've not heard anyone else tell me what their experience is like, which would be helpful (someone who just had a proper rebuild and everything is great or someone who has a high mileage engine that does something else??), but I'm assuming that one of these scenarios is indicative of problems....and I'm guessing mine since it's normal for an engine to build vacuum... My high miles 1977 bone stock station wagon engine (Ford 351M) doesn't puff smoke like this out of the oil fill, btw... I just need to know once and for all. Wish me luck and hopefully not a completely jacked-up engine.. Oddly, the engine didn't do ANY of this until the recent cam change and "repairs" to my heads (valve guides on 3 cylinders)....so I'm thinking the builder jacked something up....

 

I think what most are trying to say is you will need to have a properly functioning PCV system in the end. So why not do that first as it should be a lot cheaper than paying someone to do all the leak down tests and might help to start answering some of the questions relating to your original problems. Reinstalling the PCV system is something you could do yourself with a few parts and some rubber hose. Then proceed to paying someone to perform the leak down tests if the problem persists. Without knowing exactly how much positive pressure is in the engine; it's hard to say if the PCV system will cancel it out.

 

I understand..... It's just that my concern has gone from the positive pressure to the fact that there is smoke coming out of the engine under this pressure.... Enough that I can see it coming from under the hood and it comes inside the cabin when I turn the heat on. So yes, a pcv system is definitely needed, but my concerns had gone more to the smoke issue and possible causes.. I could do the pcv system myself, but if there are bigger issues, I'm going to address them with my builder who just took all of my cash....

 

Make sure you keep all records while dealing with the builder. Make notes of your requests with times called and attempts to resolve. You may need it. I am sure you spent a lot of money. If your issue doesn't get resolved in a satisfactory manner I would contact your Attorney Generals office.

 

Thanks a bunch for the tip... Hopefully it won't come to that, but I'm prepared if it does. Who knows.....? If I have the tests done and nothing is wrong, maybe I'm just crazy. I've been disappointed with the lack of specific responses I've gotten from the posts I've made, but maybe there just isn't enough info for me to pass on for others to get a clear picture. I was hoping that several people would take the time to pop the oil caps on their cars and let me know what they found on their own cars.. Hell, I was curious enough to check both of my other vehicles and neither blow air out and certainly not smoke....not even my old '77. Or, would love to have heard some other folks say...."My car has smoke blowing out, but runs awesome and never seemed to be a problem. Of course, the short answer is that maybe everyone else has functioning pcv's to the point that even if there was smoke, they'd never see it. Anyway, thanks for the info and wish me luck.

 

Mine doesn't blow out with the oil cap off. I do have a vented oil cap. There is no oil in the cap or vent.

 

Thanks Bucketlist...!! There's one confirmation that mine is probably not normal. I can't wait to get this figured out and all fixed. I miss just being able to drive and enjoy my car. Maybe by spring...?? If not, maybe I'll just sell it and buy a powder blue Prius....

 

Prob before your time,but all engines before PCV systems"smoked" from the vented oil filler caps.That is why PCV was invented,to keep those fumes from entering the enviroment.Even if you do find someone who tells you that you need engine work(and they will) you will STILL need a proper PCV system! Why not go there first?