Oil Leaks !@# Is the L92 rear cover different?
#21
It sounds to me that you are pressuring up the crank case at the high rpms. I would check the pvc system first. Then you might want to do a leak down on the motor and see if you have a bad cyl.(one thats not sealing well). I had a engine that had a small chip in the piston ring land it would blow oil out of the dip stick.
#23
It sounds to me that you are pressuring up the crank case at the high rpms. I would check the pvc system first. Then you might want to do a leak down on the motor and see if you have a bad cyl.(one thats not sealing well). I had a engine that had a small chip in the piston ring land it would blow oil out of the dip stick.
My PCV setup worked on other motors so I don't see any problem there. I'm pulling the trans tomorrow to replace the rear main seal and cover gasket. I hope I find some problem there. I have replaced everything else.
I didn't use any tool to align the rear cover, other than to level it with the bottom of the block, but nothing side to side. I will check that this time.
#24
Wooooo, say that again. You replaced the rear main seal, but the problem was no valve cover breathers. I have a vent tube on the valley cover vent, but nothing on the valve covers. There is a hose that connects the two valve covers toether. The PCV is close to the intake on the tube that runs to the back of the motor, then to the valley cover. All of the pressure that you are trying to vent is blowing past the rings and pressurizing the crankcase. The valley vent should work fine for that, right?
#26
The valley cover has a good baffle system, and it connects to the crankcase, so do I really need to vent the valve covers also. All of the pressure that needs to vent is coming from the bottom end, any pressure in the valve covers is the same pressure that is in the valley, right ???
I ran this setup on my LS6, it never leaked.
Or does everyone vent valve covers and valley?
#27
Hey racecar. Sorry for the difficulties with new engine. Did you put in a higher volume oil pump? I would make sure oil is not coming from higher up on the engine before tearing into it further. Also what guys are saying about pcv system. Hope to run into you at PIR this summer...sounds like you are putting out good power.
#28
Hey racecar. Sorry for the difficulties with new engine. Did you put in a higher volume oil pump? I would make sure oil is not coming from higher up on the engine before tearing into it further. Also what guys are saying about pcv system. Hope to run into you at PIR this summer...sounds like you are putting out good power.
#29
The intake is off right now so I can't get a good picture. I have a hose that runs from one valve cover to the other, but it is not connected to the PCV system. I have one other hose from the valley vent tube that runs to the back of the motor, makes a U, then up front to the intake vacuum port behind the throttle body. So I'm not pulling a vacuum on the valve covers, just on the valley cover.
The valley cover has a good baffle system, and it connects to the crankcase, so do I really need to vent the valve covers also. All of the pressure that needs to vent is coming from the bottom end, any pressure in the valve covers is the same pressure that is in the valley, right ???
I ran this setup on my LS6, it never leaked.
Or does everyone vent valve covers and valley?
The valley cover has a good baffle system, and it connects to the crankcase, so do I really need to vent the valve covers also. All of the pressure that needs to vent is coming from the bottom end, any pressure in the valve covers is the same pressure that is in the valley, right ???
I ran this setup on my LS6, it never leaked.
Or does everyone vent valve covers and valley?
#30
Wooooo, say that again. You replaced the rear main seal, but the problem was no valve cover breathers. I have a vent tube on the valley cover vent, but nothing on the valve covers. There is a hose that connects the two valve covers toether. The PCV is close to the intake on the tube that runs to the back of the motor, then to the valley cover. All of the pressure that you are trying to vent is blowing past the rings and pressurizing the crankcase. The valley vent should work fine for that, right?
#31
I am going to have to figure out a proper pcv setup for my new engine. You guys have me worried about these block porosity and starter bolt issues. Why do you have to grease the starter bolts?
#32
I'm running basically a stock Z-06 type PCV system. The fresh air comes off the T-body and enters the pass side cover at the front. The pass side back port is capped off as well as the driver side port. The PVC hose comes off of the valley cover and into a catch can then into the PVC (valve) then back into the T-body. IMO this is the cleanest and easiest PVC system for a street driven car. You need to still check your system and get rid of the hoses between the covers and make sure it has fresh air feeding the engine.
#33
As a quick test for your PCV system you could simply pop the oil fill cap off and go for a quick spin and see if it still leaks at high RPM. It might make a bit of a mess at the oil cap but i ran a breather set up on my last LS1 with no pvc like this with zero issues for four years. Buzzed it to 7K all the time.
At least if you try this you'll know for certain if its your PCV system or something with your seals, block etc.
A lot of guys make their own breather
https://ls1tech.com/forums/generatio...-20-guide.html
At least if you try this you'll know for certain if its your PCV system or something with your seals, block etc.
A lot of guys make their own breather
https://ls1tech.com/forums/generatio...-20-guide.html
#34
Thanks for all of your input guys, that is what makes this forum work, throw all of the ideas on the table and try to decide which one will work !!
Frito: I'm not following this fresh air inlet. A PCV system has to be closed or you will have a vacuum leak.
SX: That makes sense, without any breather or PCV pulling vacuum, the crankcase will be pressurized and will blow oil out of everywhere.
Beaflag: I put silicone on the inside starter bolt threads, thought that was the source of the oil leak because the bolt was covered with oil. Now I'm thinking it was oil running onto that bolt from somewhere else.
lejohn: What do you mean by fresh air, is that a vacuum tube on the throttle body, and your PCV port is farther back on the intake?
Cam: Without the cap, there would be no vacuum, and all of the crankcase pressure would come out of the cap, yes it would not build pressure in the block. That's how we ran them old school. It may be worth trying to see what happens.
I have the trans out now (what a job) and I am replacing the rear cover and rear main seal. Then I am going to make some changes in the PCV, install a Y tube to connect the valve covers to the PCV system. I'm pulling vacuum from the intake, right behind the throttle bod, that's all.
If you have another tube from the TB to valve cover, is that what you guys are calling fresh air? It sounds like a huge vacuum leak to me, is that how the stock LS1 is setup?
Frito: I'm not following this fresh air inlet. A PCV system has to be closed or you will have a vacuum leak.
SX: That makes sense, without any breather or PCV pulling vacuum, the crankcase will be pressurized and will blow oil out of everywhere.
Beaflag: I put silicone on the inside starter bolt threads, thought that was the source of the oil leak because the bolt was covered with oil. Now I'm thinking it was oil running onto that bolt from somewhere else.
lejohn: What do you mean by fresh air, is that a vacuum tube on the throttle body, and your PCV port is farther back on the intake?
Cam: Without the cap, there would be no vacuum, and all of the crankcase pressure would come out of the cap, yes it would not build pressure in the block. That's how we ran them old school. It may be worth trying to see what happens.
I have the trans out now (what a job) and I am replacing the rear cover and rear main seal. Then I am going to make some changes in the PCV, install a Y tube to connect the valve covers to the PCV system. I'm pulling vacuum from the intake, right behind the throttle bod, that's all.
If you have another tube from the TB to valve cover, is that what you guys are calling fresh air? It sounds like a huge vacuum leak to me, is that how the stock LS1 is setup?
#35
^^ Exactly!! Valvecover breathers would be the fresh air inlet too. It is a vacuum leak... a controlled one. The PCV valve controls your rate of leak. At high RPM the fresh air becomes the "exhaust" when the rings start to flutter. That will allow the gases to push out instead of pressurize the crankcase. Then under low rpm (vacuum) conditions, it returns to the inlet air source of your PCV system. Right now, your PCV is worthless. Air has to have an "in" and "out" path.
#37
I recently transfered my stock z06 engine into a gen 1 camaro I am building. I had an f body oil pan that I put on the engine. I used the used fbody oil pan gasket which I have done numerous times in other ls applications and the sucker leaks in the oil filter area. It will not be fun putting in the new gasket. Not saying this is your problem but you never know. Alfa club is having a track day on 6/20...maybe I can make that one. Did you put sealant on the flywheel bolts? That is something I have started to do.
#38
I recently transfered my stock z06 engine into a gen 1 camaro I am building. I had an f body oil pan that I put on the engine. I used the used fbody oil pan gasket which I have done numerous times in other ls applications and the sucker leaks in the oil filter area. It will not be fun putting in the new gasket. Not saying this is your problem but you never know. Alfa club is having a track day on 6/20...maybe I can make that one. Did you put sealant on the flywheel bolts? That is something I have started to do.
#39
^^ Exactly!! Valvecover breathers would be the fresh air inlet too. It is a vacuum leak... a controlled one. The PCV valve controls your rate of leak. At high RPM the fresh air becomes the "exhaust" when the rings start to flutter. That will allow the gases to push out instead of pressurize the crankcase. Then under low rpm (vacuum) conditions, it returns to the inlet air source of your PCV system. Right now, your PCV is worthless. Air has to have an "in" and "out" path.
#40
Any updates on this?!?! I seem to be having a similar but at idle and blipping the gas a bit at standstill...i haven't let the engine warm up yet since it's spiiting out so much oil at the starter bolt closest to the block but my oil pressure is at 60 at idle and when I blip the gas it pegs out past 80!!!!???