LS7 Drinking oil
#1
LS7 Drinking oil
I need some thoughts on this one, at high RPM at WOT the car starts smoking white/grey and after a hard drive you see oil/gasoline marks all over the back of my z06. Also i need to fill it with oil frequently.
I took the intake of (MSD ATOMIC airforce) its like full of oil.(Pictures)
I took the heads of noticed some clearence in the intake guides nothing on the exhaust side. New bronze sleeves put in on intake side and new seals.
I took a feel on the pistons some rocking at top but didnt think it was too bad.
Put it all together again and still the same smoking and oil consumption of course.
Did a Leakdown test before on a COLD ENGINE was getting between 10-18%
My thoughts:
1. Oil separators are needed, because of the higher intake flow the oil is forced from the dry sump tank into the intake. (ordered Elite engineering cans.)
2. The car has a too rich fuel mixture! (new tune needed)
3. The pistonrings cant hold the pressure at WOT and high RPM.
(new rings/pistons needed)
4. Is it Normal?
Setup on the car:
Lingenfelter GT-21 cam (high lift)
Ferrera valvespring kit for that cam
Rocker Arm Trunnion Upgrade
102mm Nick williams
Halltech air intake
MSD atomic airforce intake manifold
Pfadt Headers
Borla Atak exhaust
This setup got 680hp on the dyno.
Now Sweden need some help from you guys "Over there" feel free to write your ideas and i appreciate every answer!
I took the intake of (MSD ATOMIC airforce) its like full of oil.(Pictures)
I took the heads of noticed some clearence in the intake guides nothing on the exhaust side. New bronze sleeves put in on intake side and new seals.
I took a feel on the pistons some rocking at top but didnt think it was too bad.
Put it all together again and still the same smoking and oil consumption of course.
Did a Leakdown test before on a COLD ENGINE was getting between 10-18%
My thoughts:
1. Oil separators are needed, because of the higher intake flow the oil is forced from the dry sump tank into the intake. (ordered Elite engineering cans.)
2. The car has a too rich fuel mixture! (new tune needed)
3. The pistonrings cant hold the pressure at WOT and high RPM.
(new rings/pistons needed)
4. Is it Normal?
Setup on the car:
Lingenfelter GT-21 cam (high lift)
Ferrera valvespring kit for that cam
Rocker Arm Trunnion Upgrade
102mm Nick williams
Halltech air intake
MSD atomic airforce intake manifold
Pfadt Headers
Borla Atak exhaust
This setup got 680hp on the dyno.
Now Sweden need some help from you guys "Over there" feel free to write your ideas and i appreciate every answer!
#2
Definitely not normal. But I think I know what is going on. Did you use Teflon or RTV sealant on the rocker arm bolts? The bolt holes for the intake rocker arms go into the intake runner. This could cause excessive oil in the intake and to pass through the engine out the exhaust.
Last edited by 140K_GXP; 09-03-2016 at 04:37 PM.
The following 2 users liked this post by 140K_GXP:
Last 1 (05-22-2024), wannafbody (05-22-2024)
#3
I did use blue Loctite for the bolts, think thats the problem?
!! Looking at it right now and unscrewed one of the rocker arms, looks like its a "stop" down in the thread. So the oil cant go out that way?
!! Looking at it right now and unscrewed one of the rocker arms, looks like its a "stop" down in the thread. So the oil cant go out that way?
Last edited by Heddde; 09-04-2016 at 08:39 AM.
#4
I've heard the sealant on the rocker arm bolts but not sure if it was on LS7s too.
#7
Is that picture of an intake rocker arm or an exhaust rocker? Typically on ported heads, its the intake bolt hole that gets exposed to the ports. And it is possible that the bolt holes won't be exposed on every one of them.
I would take off all the rocker arms, use a good RTV sealant, re-install, and check oil consumption.
Check out this thread: https://ls1tech.com/forums/generatio...oke-works.html
This person had the same symptoms you have and re-sealing the rocker arm bolts pretty much fixed it.
I would take off all the rocker arms, use a good RTV sealant, re-install, and check oil consumption.
Check out this thread: https://ls1tech.com/forums/generatio...oke-works.html
This person had the same symptoms you have and re-sealing the rocker arm bolts pretty much fixed it.
Last edited by 140K_GXP; 09-07-2016 at 06:27 AM.
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#12
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Oil Film at Rear of Car
The chance of an intake oil leak is easy to determine, just watch the exhaust at the time of throttle "lift" for Blue Colour
Not stated in your observation.
The stated observation of oil film, gray/black smoke at WOT is a result of rings passing oil.
There could be a leak though that result would be oil film only, not smoke from the exhaust pipes as stated.
The cause could be the tune, too much spark advance.
My question is about your Spark Instant at WOT, max RPM.
What is that value ?
Spark plug heat range?
Fuel octane, though in Sweden it is high ?
YES, too Rich at WOT though you would be down on power.
Lance
Not stated in your observation.
The stated observation of oil film, gray/black smoke at WOT is a result of rings passing oil.
There could be a leak though that result would be oil film only, not smoke from the exhaust pipes as stated.
The cause could be the tune, too much spark advance.
My question is about your Spark Instant at WOT, max RPM.
What is that value ?
Spark plug heat range?
Fuel octane, though in Sweden it is high ?
YES, too Rich at WOT though you would be down on power.
Lance
#13
I need some thoughts on this one, at high RPM at WOT the car starts smoking white/grey and after a hard drive you see oil/gasoline marks all over the back of my z06. Also i need to fill it with oil frequently.
I took the intake of (MSD ATOMIC airforce) its like full of oil.(Pictures)
I took the heads of noticed some clearence in the intake guides nothing on the exhaust side. New bronze sleeves put in on intake side and new seals.
I took a feel on the pistons some rocking at top but didnt think it was too bad.
Put it all together again and still the same smoking and oil consumption of course.
Did a Leakdown test before on a COLD ENGINE was getting between 10-18%
My thoughts:
1. Oil separators are needed, because of the higher intake flow the oil is forced from the dry sump tank into the intake. (ordered Elite engineering cans.)
2. The car has a too rich fuel mixture! (new tune needed)
3. The pistonrings cant hold the pressure at WOT and high RPM.
(new rings/pistons needed)
4. Is it Normal?
Setup on the car:
Lingenfelter GT-21 cam (high lift)
Ferrera valvespring kit for that cam
Rocker Arm Trunnion Upgrade
102mm Nick williams
Halltech air intake
MSD atomic airforce intake manifold
Pfadt Headers
Borla Atak exhaust
This setup got 680hp on the dyno.
Now Sweden need some help from you guys "Over there" feel free to write your ideas and i appreciate every answer!
I took the intake of (MSD ATOMIC airforce) its like full of oil.(Pictures)
I took the heads of noticed some clearence in the intake guides nothing on the exhaust side. New bronze sleeves put in on intake side and new seals.
I took a feel on the pistons some rocking at top but didnt think it was too bad.
Put it all together again and still the same smoking and oil consumption of course.
Did a Leakdown test before on a COLD ENGINE was getting between 10-18%
My thoughts:
1. Oil separators are needed, because of the higher intake flow the oil is forced from the dry sump tank into the intake. (ordered Elite engineering cans.)
2. The car has a too rich fuel mixture! (new tune needed)
3. The pistonrings cant hold the pressure at WOT and high RPM.
(new rings/pistons needed)
4. Is it Normal?
Setup on the car:
Lingenfelter GT-21 cam (high lift)
Ferrera valvespring kit for that cam
Rocker Arm Trunnion Upgrade
102mm Nick williams
Halltech air intake
MSD atomic airforce intake manifold
Pfadt Headers
Borla Atak exhaust
This setup got 680hp on the dyno.
Now Sweden need some help from you guys "Over there" feel free to write your ideas and i appreciate every answer!
Did you ever find a solution for this? My 09 z06 having the same issue on track days. Consuming oil and coating my back bumper.
#14
TECH Senior Member
Heddde hasn't been here for eight years. Check post dates.....