Oil pressure
- Thread starter Desi
- Start date
gwbartlett
GT Owner
Desi-
Here is what my GT does:
Cold-Idle 50psi. 2000rpm 75
Hot-Idle 30psi, 1,700rpm 50psi, 2,200rpm 55-60psi, 3,500rpm and up 75psi.
I hope this helps.
-GW
Here is what my GT does:
Cold-Idle 50psi. 2000rpm 75
Hot-Idle 30psi, 1,700rpm 50psi, 2,200rpm 55-60psi, 3,500rpm and up 75psi.
I hope this helps.
-GW
Bill Briley
GT Owner
I just notoced this thread.........
My '05 is:
45 lbs at 1000 rpm cold
55 lbs at 2500 rpm cold
25 lbs at 1000 rpm hot
40 lbs at 2500 rpm hot
50 lbs at WOT hot
From my drag racing days....10 lbs per 1000rpm was considered OK. However, Dry Sumps are new to me.
Where is Craig when I need his advice?
My '05 is:
45 lbs at 1000 rpm cold
55 lbs at 2500 rpm cold
25 lbs at 1000 rpm hot
40 lbs at 2500 rpm hot
50 lbs at WOT hot
From my drag racing days....10 lbs per 1000rpm was considered OK. However, Dry Sumps are new to me.
Where is Craig when I need his advice?
Bart Carter
GT Owner
mardyn
GT Owner
Mine is all over the place once it warms up... kinda' has me worried. Has plenty when it's cold, once it warms up it fluctuates depending on throttle positition.. but it doesn't seem linear as one would think.
I'll get some actual numbers and post up next time I go for a ride.
mardyn
I'll get some actual numbers and post up next time I go for a ride.
mardyn
Bart Carter
GT Owner
I don't have information on the design characteristics of the GT, but it seems that 75 psi is where the relief valve bypasses the oil. Long ago it was "established" in racing circles that you would expect 10 lbs per 1,000 RPM. But there were many fudge factors in this. You wouldn't have 10 lbs at idle and you wouldn't expect 90 lbs at 9,000 RPM.
So, with the GT, I would expect something above 20 lbs at idle and around 60 lbs at speed. When cold, you will see the relief valve limit of 75 lbs because the oil doesn't flow well until warmed. But you are relying on the relief valve to really control the oil and not let excess pressure through. You can actually blow off (unseat) an oil filter with too much pressure. The relief valve is usually used to relieve the cold pressure and not needed when the oil if fully warm.
If you are seeing 75 lbs pressure fully warm (190 degress or more) there are 3 things that may contribute to this. The pressure guage may be faulty, the oil weight is too heavy, or there is a restriction that would cause the pressure to be high all the time. It could be from some tight tolerances on a new engine. If the pressure goes down when the engine is really warm (220 plus), I wouldn't worry. But if it is high all the time, especially at 3500 RPM, I would be wondering what the cause was.
I'll check mine next outing so we can have another data point. But on my trip home, I don't remember going past 60 once warmed at speed.
So, with the GT, I would expect something above 20 lbs at idle and around 60 lbs at speed. When cold, you will see the relief valve limit of 75 lbs because the oil doesn't flow well until warmed. But you are relying on the relief valve to really control the oil and not let excess pressure through. You can actually blow off (unseat) an oil filter with too much pressure. The relief valve is usually used to relieve the cold pressure and not needed when the oil if fully warm.
If you are seeing 75 lbs pressure fully warm (190 degress or more) there are 3 things that may contribute to this. The pressure guage may be faulty, the oil weight is too heavy, or there is a restriction that would cause the pressure to be high all the time. It could be from some tight tolerances on a new engine. If the pressure goes down when the engine is really warm (220 plus), I wouldn't worry. But if it is high all the time, especially at 3500 RPM, I would be wondering what the cause was.
I'll check mine next outing so we can have another data point. But on my trip home, I don't remember going past 60 once warmed at speed.
fjpikul
GT Owner
Bart Carter
GT Owner
OK, my pressures parallel this also. I guess the design of the oiling system in a GT sets the pressures to this level. When my engine was at 210 degrees, I needed to rev to 4,000 RPM to reach 75 psi. My apology for any undue apprehension about the oil pressure, but I had never seen 75 psi at 3,500 RPM in a production car before.gwbartlett said: