Oil Pressure Issue
Thread Starter
Instructor
Joined: Sep 2013
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Oil Pressure Issue
Car: '06 C6Z LS7
Use: Track (Club Racing)
Engine Mods: Cam, Lifters, Push-Rods, Valve Springs, SS Exhaust Valves, New Valve Guides, (Spec by Comp), Headers, Oil Pump (Katech Red).
Problem:
After breaking the motor in (JG Breaking Oil) and tuning the ECM we headed to the track. The second session we notice lower oil pressures but were not overly concerned at idle as the engine\oil temp. was 230\240. (Idle\230-240\20psi)... And upon feeding the throttle the pressure will jump to 45/50psi (hot). HOWEVER, suddenly when returning to the track, we lost pressure and the warning message was displayed "Low Oil Pressure". The gauge dropped to approx. 5psi. and the pressure would NOT climb even when feeding throttle! After cooling down a little and letting the car seat for 1hr. or so...the pressures returned.... when back on the track and after the 3 turn, complete pressure loss and "Low Oil Pressure". After 1/2 hr. of seating...Pressures returned!
Question: What would cause the pressure gauge to loose\drop reading randomly considering there was never a lack of oil volume?
Thank You.
Use: Track (Club Racing)
Engine Mods: Cam, Lifters, Push-Rods, Valve Springs, SS Exhaust Valves, New Valve Guides, (Spec by Comp), Headers, Oil Pump (Katech Red).
Problem:
After breaking the motor in (JG Breaking Oil) and tuning the ECM we headed to the track. The second session we notice lower oil pressures but were not overly concerned at idle as the engine\oil temp. was 230\240. (Idle\230-240\20psi)... And upon feeding the throttle the pressure will jump to 45/50psi (hot). HOWEVER, suddenly when returning to the track, we lost pressure and the warning message was displayed "Low Oil Pressure". The gauge dropped to approx. 5psi. and the pressure would NOT climb even when feeding throttle! After cooling down a little and letting the car seat for 1hr. or so...the pressures returned.... when back on the track and after the 3 turn, complete pressure loss and "Low Oil Pressure". After 1/2 hr. of seating...Pressures returned!
Question: What would cause the pressure gauge to loose\drop reading randomly considering there was never a lack of oil volume?
Thank You.
Thread Starter
Instructor
Joined: Sep 2013
Posts: 219
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There were no issues with sound, rev., power, or overheating. All was normal but the Oil Pressure. Upon waiting overnight to completely cool oil pressure was at 120 deg. = 40psi @ idle and 50psi @ 3000-3500
Thread Starter
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I was afraid so.. As I understand its located at the back of the engine behind the air intake hence, its a task to get to.
1 - It there an after market unit which may be better?
2 - Is there a way to read the oil pressure from the bottom of the motor as well? if so, how and where?
Thank You
1 - It there an after market unit which may be better?
2 - Is there a way to read the oil pressure from the bottom of the motor as well? if so, how and where?
Thank You
Thread Starter
Instructor
Joined: Sep 2013
Posts: 219
Likes: 0
Replacing the Oil Pressure Sending Unit on C6 ZO6
So I decided to replace the Oil Pressure Sending Unit....the easy way...approx. 45min. to remove (complete breakdown from top to removal of sensor). See pics.
Ps. I plan on relocating the sensor with a guage. I will update with pics upon completion.
Ps. I plan on relocating the sensor with a guage. I will update with pics upon completion.
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Thread Starter
Instructor
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No oil pressure!
Replaced the Oil Pressure Sending Unit and added an analog gauge as backup.....STILL LOOSING PRESSURE!
At idle and 195-200deg. Pressure is fine BUT when loading the engine at 3500-5500 rpm the pressure is lost... all of it! If I shut the engine off and wait 5-10min. I get my pressure back at idle.... totally crazy!!
At idle and 195-200deg. Pressure is fine BUT when loading the engine at 3500-5500 rpm the pressure is lost... all of it! If I shut the engine off and wait 5-10min. I get my pressure back at idle.... totally crazy!!
Safety Car
Joined: Aug 2004
Posts: 4,067
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From: Houston Texas
Used oil analysis from Blackstone lavatories. You could have a serious issue with your main bearings. The oil analysis report will show it.
Do you have issues with a hard start when is hot?
Do you have issues with a hard start when is hot?
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BUT!
I was told to add some oil and watch the level in the oil tank. WELL..WELL... When it drops pressure I noticed that there is no oil in the oil tank...Could it be a bad oil pump? Dipstick was dry (after waiting a couple of minutes)!!!! Where did the oil go?
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After replacing ...still issues.
I was told to add some oil and watch the level in the oil tank. WELL..WELL... When it drops pressure I noticed that there is no oil in the tank...Could it be a bad oil pump? Dipstick was dry (after waiting a couple of minutes)!!!! Where did the oil go?
I was told to add some oil and watch the level in the oil tank. WELL..WELL... When it drops pressure I noticed that there is no oil in the tank...Could it be a bad oil pump? Dipstick was dry (after waiting a couple of minutes)!!!! Where did the oil go?
Former Vendor
Joined: Mar 2010
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From: Toronto Ontario
How much oil are you running? Are you only losing pressure at high rpm? We have done lots of testing with the stock dry sump setup and found above 6k rpm oil is being aerated so bad pressure dropped 10psi from 6-7rpm
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Strange but true!
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Why after the oil tank dries up ..... I wait a couple of hours or so and the oil returns to the oil tank.... Where does it disappear to? or return from?
CRAZY!
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