Porsche 911 LS2 Oil Temp Issue
11-14-2010, 12:55 PM
#1
Porsche 911 LS2 Oil Temp Issue Some of you may recall my build with the rear mounted radiator in a Porsche 911. The cooling results have been successful but now I am questioning the oil temp.
Here is the senario:
If I start the car and leave in the idle for 30min the water temp reaches 195~200F within 10min and remains steady at this temp
The oil temp raises to 250F within 20min and the climbs to 300F in 30min
Is it possible for the oil temp to be hotter than the water temp?
I am using a oil cooler block on the side of the motor and is where I mounted the sensor (see picture). I suspect that the sending unit may be bad and have ordered a new one from Summit. Looking at the pic I think I may have used the Porsche VDO sending unit and hope this is the problem.
Any suggestions?
BTW, I added a 25 Row oil cooler and get the same results
Here is the senario:
If I start the car and leave in the idle for 30min the water temp reaches 195~200F within 10min and remains steady at this temp
The oil temp raises to 250F within 20min and the climbs to 300F in 30min
Is it possible for the oil temp to be hotter than the water temp?
I am using a oil cooler block on the side of the motor and is where I mounted the sensor (see picture). I suspect that the sending unit may be bad and have ordered a new one from Summit. Looking at the pic I think I may have used the Porsche VDO sending unit and hope this is the problem.
Any suggestions?
BTW, I added a 25 Row oil cooler and get the same results
11-16-2010, 12:12 PM
#4
Generally a LSx car, the oil temp will run around 15-30 hotter than the Water Temp.
I would not think the location would be a problem.. but have considered moving the sender to another location..? directly in the Oil pan or somewhere off of the oil cooler ?
I would not think the location would be a problem.. but have considered moving the sender to another location..? directly in the Oil pan or somewhere off of the oil cooler ?
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12-20-2010, 10:22 AM
#8
pdate:
Finally got around to changing out the oil sending unit and experimenting with my coolant system. As suspected I was using the wrong oil temp sending unit and once changed oil temp is staying steady @ 194F
In regards to the radiator and trying different combination's of anti freeze Vs distilled water here are the results:
50/50 Tap Water + Dexcool (GM Recommended Antifreeze)
First test: 30min idle time while sitting in the garage with no incoming air (Outside Temp 60F). Fan's pulling in air and pushing over the intake and engine. Temp range after heated up was 198~205F. Average coolant temp @ 200F.
Distilled Water
First test: 30min idle time while sitting in the garage with no incoming air (Outside temp 60F). Fan's pulling in air and pushing over the intake and engine. Temp range after heated up was 194~198F. Average coolant temp @ 194F.
Distilled Water + DEI Radiator Relief
First test: 30min idle time while sitting in the garage with no incoming air (Outside temp 60F). Fan's pulling in air and pushing over the intake and engine. Temp range after heated up was 192~194F. Average coolant temp @ 192~194F.
Conclusion:
Distilled water significantly reduces max operating temp by 7 degrees while DEI Radiator relief provides an additional 4 degree and safety for lubricating the system. Since I live in Florida and do not need to worry about snow, ice or freezing I see no benefits for using Dexcool.
Finally got around to changing out the oil sending unit and experimenting with my coolant system. As suspected I was using the wrong oil temp sending unit and once changed oil temp is staying steady @ 194F
In regards to the radiator and trying different combination's of anti freeze Vs distilled water here are the results:
50/50 Tap Water + Dexcool (GM Recommended Antifreeze)
First test: 30min idle time while sitting in the garage with no incoming air (Outside Temp 60F). Fan's pulling in air and pushing over the intake and engine. Temp range after heated up was 198~205F. Average coolant temp @ 200F.
Distilled Water
First test: 30min idle time while sitting in the garage with no incoming air (Outside temp 60F). Fan's pulling in air and pushing over the intake and engine. Temp range after heated up was 194~198F. Average coolant temp @ 194F.
Distilled Water + DEI Radiator Relief
First test: 30min idle time while sitting in the garage with no incoming air (Outside temp 60F). Fan's pulling in air and pushing over the intake and engine. Temp range after heated up was 192~194F. Average coolant temp @ 192~194F.
Conclusion:
Distilled water significantly reduces max operating temp by 7 degrees while DEI Radiator relief provides an additional 4 degree and safety for lubricating the system. Since I live in Florida and do not need to worry about snow, ice or freezing I see no benefits for using Dexcool.
12-20-2010, 12:51 PM
#9
Not so fast. Antifreeze prevents corrosion, lubes the pump, acts as a surfactant, and both raises boiling point and lowers freezing point.
The only reason race cars use water + additive is that they drain the coolant after every race and they dont have to worry about environmental and toxicity issues.
I'm not a dexcool fan, so I just use the green stuff.
The only reason race cars use water + additive is that they drain the coolant after every race and they dont have to worry about environmental and toxicity issues.
I'm not a dexcool fan, so I just use the green stuff.
12-20-2010, 01:38 PM
#10
Not so fast. Antifreeze prevents corrosion, lubes the pump, acts as a surfactant, and both raises boiling point and lowers freezing point.
The only reason race cars use water + additive is that they drain the coolant after every race and they dont have to worry about environmental and toxicity issues.
I'm not a dexcool fan, so I just use the green stuff.
The only reason race cars use water + additive is that they drain the coolant after every race and they dont have to worry about environmental and toxicity issues.
I'm not a dexcool fan, so I just use the green stuff.
It is well known that antifreeze reduces cooling capacity compared to straight water. But for all the reasons above you need to use the antifreeze. I think you can get by with less than a 50-50 mix.
12-21-2010, 10:11 AM
#11
Outside temp a little higher today and decided to put some load on the engine with a couple of high RPM passes. Here are the results
Distilled Water + DEI Radiator Relief
First test: Temp range after heated up was 194~198F. 3 passes under acceleration and the temp raises to 205~210 then settles back down to 198F while in idle.
I am a bit concerned that in 98F degree Florida weather these numbers will raise 5~10F which is on the high side of my goal.
What do you guys think about a 160F thermostat?
I believe I have a 180F which I will need to confirm with RH
Distilled Water + DEI Radiator Relief
First test: Temp range after heated up was 194~198F. 3 passes under acceleration and the temp raises to 205~210 then settles back down to 198F while in idle.
I am a bit concerned that in 98F degree Florida weather these numbers will raise 5~10F which is on the high side of my goal.
What do you guys think about a 160F thermostat?
I believe I have a 180F which I will need to confirm with RH
