Crankcase Ventilation

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.

03-17-2013, 08:52 AM	#1
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	#2
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.