crankcase over-pressure

Falcoms · 09-13-2010, 02:33 PM

Hey all, I've run into a slight issue with my full-bridged 13B-RE that I've got in my FC. The crankcase is over-pressurizing when I go north of about 7,000 RPM, and it's gushing oil out the nipple on the back side of the center iron next to the oil fill neck. It's quite annoying, especially since I've no idea what to do to stop this. I've got a breather vent system set up on it now, but with the weber-style ITB setup, I don't have a PCV system as of yet. Oh, it's also all run as a N/A setup with all turbo oiling blocked off and I'm running an FD oil pressure regulator and pressure relief spring so it runs about 90-100psi when at temp. Thanks for the input, I'd really like to get this figured out soon as the engine is almost done with break-in and I don't really want to have oil spewing out on the dyno during the final tuning.

sen2two · 09-13-2010, 03:06 PM

Oil catch can. They sell all kinda from about 100 different companies. There's a all kinds of them on eBay for about 20 bucks at all times.

***TitaniumTT*** · 09-13-2010, 07:50 PM

Oil catch can isn't going to cure it, it'll only fill up until the oil pukes out of catch can.

Is this happening on straits or on a track, lots of right handers etc etc? If it's only on the right handers, you need an oil baffle plate. I can make a 100 3rd gear pulls on the highway with nothing getting into the catch can. But after one or two runs on an auto-x track the thing is spewing

Also, who built the engine? What were the tolerances set to? How bad were the wear grooves in the irons? It could be honest blow-by puking up the oil filler.

Also, just a catch can is kinda useless as I have found out. What you should be doing is filtering it out through the catch can and pulling clean air into the engine under vaccuum.

sen2two · 09-13-2010, 09:28 PM

He's right, A baffle would be a better choice...

***TitaniumTT*** · 09-13-2010, 09:34 PM

Depends what the problem is. If it's oil creeping up the filler from lateral g's, then yeah, if it's ton's of blow-by from a shitty build, than it'll only slow it down.

Baffle plates are a good idea though.

***TitaniumTT*** · 09-13-2010, 09:37 PM

whoops, just re-read the post............

that nipple on the iron is obviously routed into the center iron. No offense, but it sounds like a pretty loose engine.

There are a couple of things to do here. One is to cap that nipple solid and set up a re-circ system from the oil filler tube back into the intake through a catch tank to clean it somewhat.

Seeing as how you have two unused oil return lines, you could plumb that nipple through a catch can with a filter and just drain it back into the sump

RETed · 09-13-2010, 10:02 PM

Quote:

Originally Posted by TitaniumTT

if it's ton's of blow-by from a shitty build,

+1

-Ted

09-13-2010, 02:33 PM	#1
Falcoms The Newbie Join Date: Feb 2008 Location: McHenry, IL iTrader: (0) Posts: 3 Rep Power: 0	crankcase over-pressure Hey all, I've run into a slight issue with my full-bridged 13B-RE that I've got in my FC. The crankcase is over-pressurizing when I go north of about 7,000 RPM, and it's gushing oil out the nipple on the back side of the center iron next to the oil fill neck. It's quite annoying, especially since I've no idea what to do to stop this. I've got a breather vent system set up on it now, but with the weber-style ITB setup, I don't have a PCV system as of yet. Oh, it's also all run as a N/A setup with all turbo oiling blocked off and I'm running an FD oil pressure regulator and pressure relief spring so it runs about 90-100psi when at temp. Thanks for the input, I'd really like to get this figured out soon as the engine is almost done with break-in and I don't really want to have oil spewing out on the dyno during the final tuning. __________________ 1990 Mazda RX-7 GXL, 200,000+ miles on chassis full bridge 13B-RE N/A, Turbo trans, ACT Pro-lite flywheel, SPEC stage 2+ clutch, E11v2 Racing Beat Header and Pre-silencer, APEXi GT Cat-back, Corksport aluminum radiator, solid motor and trans mounts

09-13-2010, 03:06 PM	#2
sen2two KTEC Join Date: Jan 2009 iTrader: (2) Posts: 642 Rep Power: 0	Oil catch can. They sell all kinda from about 100 different companies. There's a all kinds of them on eBay for about 20 bucks at all times. __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

09-13-2010, 07:50 PM	#3
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	Oil catch can isn't going to cure it, it'll only fill up until the oil pukes out of catch can. Is this happening on straits or on a track, lots of right handers etc etc? If it's only on the right handers, you need an oil baffle plate. I can make a 100 3rd gear pulls on the highway with nothing getting into the catch can. But after one or two runs on an auto-x track the thing is spewing Also, who built the engine? What were the tolerances set to? How bad were the wear grooves in the irons? It could be honest blow-by puking up the oil filler. Also, just a catch can is kinda useless as I have found out. What you should be doing is filtering it out through the catch can and pulling clean air into the engine under vaccuum. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

09-13-2010, 09:28 PM	#4
sen2two KTEC Join Date: Jan 2009 iTrader: (2) Posts: 642 Rep Power: 0	He's right, A baffle would be a better choice... __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

09-13-2010, 09:34 PM	#5
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	Depends what the problem is. If it's oil creeping up the filler from lateral g's, then yeah, if it's ton's of blow-by from a shitty build, than it'll only slow it down. Baffle plates are a good idea though. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

09-13-2010, 09:37 PM	#6
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	whoops, just re-read the post............ that nipple on the iron is obviously routed into the center iron. No offense, but it sounds like a pretty loose engine. There are a couple of things to do here. One is to cap that nipple solid and set up a re-circ system from the oil filler tube back into the intake through a catch tank to clean it somewhat. Seeing as how you have two unused oil return lines, you could plumb that nipple through a catch can with a filter and just drain it back into the sump __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**