Crankcase Ventilation

Wade_Owens · 02-14-2013, 12:47 PM

Quote:

Originally Posted by Frank Castros

Wade,
Please expand on your comment of "releasing the vacuum for the oil to drain".

Sure Frank, after the engine is warmed up, and I'm ready to change the oil, I have to "release" the vacuum that my system creates or the oil wont drain from the pain. The first time this happened, it scared the s&*^ out of me, I thought I had forgot to put enough or very much oil in it. After opening the filler spout, the oil drained freely as it had always done before.

Also, be very careful while playing with this, it does affect the oil pressure. If you use thin oil and low oil pressure, it messes with the bypass valve in the pump.

Wade

Frank Castros · 02-14-2013, 01:14 PM

Wade,
Thanks, that's a great story, and it seems that you have found the system that works for you.
This is a subject that merits serious consideration.

Jeff Lee · 02-14-2013, 02:12 PM

I've spent a lot of money on PCV valves; trying different applications that I wont go into detail on. But yes, some work, some work better than others..and some don't work.

Pat Cook · 02-18-2013, 12:46 AM

Quote:

Originally Posted by Wade_Owens

Sure Frank, after the engine is warmed up, and I'm ready to change the oil, I have to "release" the vacuum that my system creates or the oil wont drain from the pain. The first time this happened, it scared the s&*^ out of me, I thought I had forgot to put enough or very much oil in it. After opening the filler spout, the oil drained freely as it had always done before.

Also, be very careful while playing with this, it does affect the oil pressure. If you use thin oil and low oil pressure, it messes with the bypass valve in the pump.

Wade

Wade have you ever connected a vacuum gauge to your crankcase?

not being a hydraulic engineer or anything like it, but don't pumps need a certain amount of atmosphere pressure to pump?

brake booster check valve and a sealed crankcase, sounds interesting. Use the manifold vacuum to pump the crankcase down.

FED 387 · 03-16-2013, 08:17 PM

believe it or not if they are set up right ya can actually hear the air hissing a little(of course with the engine shut off) also pay close attn to any oil being sucked into the intake it will/could coat the top of the pistons and create detonation !!!

SGSST109E · 03-17-2013, 08:52 AM

Back in the 70's we ran the single ring pistons in modified eliminator. The key was to have the engine sealed. Not having access to a vacuum pump we would take the vacuum off the running tow car to test the engine seal. We would try to have in maintain vacuum for one min. Today they make double lip crank seals we used O rings back then in the front and rear seals. We always had vacuum gauges in the cars. The system we used was the moroso setup on both headers as well as one going to the intake under the carb. We used the same mopar check valve that was used on the headers. If the motor was sealed you had small traces of oil in the intake after a run. With the oil separtors available today that should know longer be and issue.

Myron Piatek · 03-17-2013, 10:36 AM

I wish I would have had time to sit down & find out how he did it, but Truman Fields showed me his set-up on his 400 Firebird many years ago. Not sure if it was the IHRA Pure Stock or regular Stocker. Anyway, he told me to remove the oil fill cap with the car running. After tugging on several times with no success, I figured it was a twist-on style. After many turns, that didn't work either. Finally I grabbed onto it and gave it a pretty hefty tug, and it came out! He had an amazing amount of vacuum built up in the crankcase.

02-14-2013, 01:14 PM	#2
Frank Castros VIP Member Join Date: Nov 2001 Location: The Lowcountry. Posts: 2,980 Likes: 2,604 Liked 2,729 Times in 963 Posts	Re: Crankcase Ventilation Wade, Thanks, that's a great story, and it seems that you have found the system that works for you. This is a subject that merits serious consideration.

02-14-2013, 02:12 PM	#3
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Crankcase Ventilation I've spent a lot of money on PCV valves; trying different applications that I wont go into detail on. But yes, some work, some work better than others..and some don't work. __________________ Jeff Lee 7494 D/S '70 AMX

03-16-2013, 08:17 PM	#5
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,422 Likes: 529 Liked 333 Times in 180 Posts	Re: Crankcase Ventilation believe it or not if they are set up right ya can actually hear the air hissing a little(of course with the engine shut off) also pay close attn to any oil being sucked into the intake it will/could coat the top of the pistons and create detonation !!!

03-17-2013, 08:52 AM	#6
SGSST109E Member Join Date: Jun 2007 Location: NJ Posts: 351 Likes: 62 Liked 126 Times in 61 Posts	Re: Crankcase Ventilation Back in the 70's we ran the single ring pistons in modified eliminator. The key was to have the engine sealed. Not having access to a vacuum pump we would take the vacuum off the running tow car to test the engine seal. We would try to have in maintain vacuum for one min. Today they make double lip crank seals we used O rings back then in the front and rear seals. We always had vacuum gauges in the cars. The system we used was the moroso setup on both headers as well as one going to the intake under the carb. We used the same mopar check valve that was used on the headers. If the motor was sealed you had small traces of oil in the intake after a run. With the oil separtors available today that should know longer be and issue.

03-17-2013, 10:36 AM	#7
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,542 Likes: 34 Liked 138 Times in 51 Posts	Re: Crankcase Ventilation I wish I would have had time to sit down & find out how he did it, but Truman Fields showed me his set-up on his 400 Firebird many years ago. Not sure if it was the IHRA Pure Stock or regular Stocker. Anyway, he told me to remove the oil fill cap with the car running. After tugging on several times with no success, I figured it was a twist-on style. After many turns, that didn't work either. Finally I grabbed onto it and gave it a pretty hefty tug, and it came out! He had an amazing amount of vacuum built up in the crankcase.