crank case pressure control
#1
Rotary Freak
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crank case pressure control
Hi everyone , I need some thoughts and advise to get my crank case pressure under control. I've searched this topic and found a couple threads relating to this issue , but I would like to know if there have been any new developments or innovations in this area. I am presently runnimg 11 psi boost and its manageable , but I plan to go over 20 psi to a max of 30psi soon and I expect my catch can to fill up quickly ! Is anyone using the oil drain hole for the rear turbo on the rear iron ? if so , how doe this work ? I am thinking of using this point in conjunction with the oil filler neck , since the vacuum effect induced by the turbo would be interrupted once oil gets up into the filler neck and the catch can.
#5
I have -6 lines running to the rear oil drain and the oil filler neck coming into my Moroso catch can/ vent. I also have a line running from the bottom of the catch can plumbed into the front cover so it drains back into the pan so I never have to empty it. The gases get vented while the oil remains is the theory and it seems to very work well at the track ![Smilie](https://www.rx7club.com/images/smilies/smile.gif)
Unfortunately, ever since I got my RE-A vented hood, I have to clean my windshield every session or so because the venting of the catch can sprays right onto my windshield lol. On the other hand, I can clearly see my engine venting through the vent on the hood while driving even cruising on the highway (after oil is up to full temperature)
thewird
![Smilie](https://www.rx7club.com/images/smilies/smile.gif)
Unfortunately, ever since I got my RE-A vented hood, I have to clean my windshield every session or so because the venting of the catch can sprays right onto my windshield lol. On the other hand, I can clearly see my engine venting through the vent on the hood while driving even cruising on the highway (after oil is up to full temperature)
thewird
#7
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#8
Regards,
Crispy
#12
The OEM pan is already baffled.
The problem street cars with oil pans, baffled or not, are not really designed to cope with lateral forces in sometimes in excess of 1.5g when on Hoosier slicks.
FWIW:
13B dry sump front cover (PN0000-01-9314) $2462.56.
13B dry sump gear kit (PN 0000-01-9313) $415.00
Then you add plumbing, special hard piping o-rings (if using the factory dry sump system) hoses, pump(s), pump hanger, oil tank, and engine base plate.![Big Grin](https://www.rx7club.com/images/smilies/biggrin.gif)
Regards,
Crispy
The problem street cars with oil pans, baffled or not, are not really designed to cope with lateral forces in sometimes in excess of 1.5g when on Hoosier slicks.
FWIW:
13B dry sump front cover (PN0000-01-9314) $2462.56.
13B dry sump gear kit (PN 0000-01-9313) $415.00
Then you add plumbing, special hard piping o-rings (if using the factory dry sump system) hoses, pump(s), pump hanger, oil tank, and engine base plate.
![Big Grin](https://www.rx7club.com/images/smilies/biggrin.gif)
Regards,
Crispy
#14
Vent both sides of the engine with as big and short of a line as you can get away with. Problem solved.
I had an FC and I vented the front cover below the turbo drain on that side and out the filler neck on the other. I never had another drop of oil in the catch can after that and I used to fill a quart sized catch can every 20 minute session.
https://www.rx7club.com/showpost.php...&postcount=205
https://www.rx7club.com/showpost.php...&postcount=210
https://www.rx7club.com/showpost.php...&postcount=211
There are some crazy ideas and over-engineered solutions in that thread (most of which don't work). It's as simple as finding a place where the compressed air can escape from with no oil in it's way to push out.
I had an FC and I vented the front cover below the turbo drain on that side and out the filler neck on the other. I never had another drop of oil in the catch can after that and I used to fill a quart sized catch can every 20 minute session.
https://www.rx7club.com/showpost.php...&postcount=205
https://www.rx7club.com/showpost.php...&postcount=210
https://www.rx7club.com/showpost.php...&postcount=211
There are some crazy ideas and over-engineered solutions in that thread (most of which don't work). It's as simple as finding a place where the compressed air can escape from with no oil in it's way to push out.
#18
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I have been thinking about an exhaust scavenged crank case vent system utilizing a check valve in the downpipe. Would this system require/benefit from the use of a catch can and if so would it make sense for the can to be vented or locate a vent elsewhere (i cant think of another location).
#22
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no vent, the way the system works is this, you have a bung in your dp with a angle tip tube cut in the bung(http://vibrantperformance.com/catalo...oducts_id=1244 or moroso's http://www.teglerizer.com/triumphstu...scavenging.htm)
Then plumb in a one way check so that no pressure can come from the exhaust system. from that check valve you would then run a hose to one port of your catch can. now take another piece of hose and connect that to the other port of your catch can and run that to you breather tube on the oil filler neck or were ever else you have your vent on the engine. all the blow by and gases with be burned in the exhaust and any oil will be collected into the catch can and can be drained.
I used the check valve from the factory acv pipe off the cat. ill snap some pics this week of my setup and show yall.
Then plumb in a one way check so that no pressure can come from the exhaust system. from that check valve you would then run a hose to one port of your catch can. now take another piece of hose and connect that to the other port of your catch can and run that to you breather tube on the oil filler neck or were ever else you have your vent on the engine. all the blow by and gases with be burned in the exhaust and any oil will be collected into the catch can and can be drained.
I used the check valve from the factory acv pipe off the cat. ill snap some pics this week of my setup and show yall.
#23
Racing Rotary Since 1983
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"Vent both sides of the engine with as big and short of a line as you can get away with. Problem solved."
i can't add anything to the above. simple stuff. don't make it complicated.
howard
i can't add anything to the above. simple stuff. don't make it complicated.
howard