Porsche 911 SWAP Oil Temp Issue
#1
Porsche 911 SWAP Oil Temp Issue
Have this posted in the conversions section but have got no hits or feedback so trying my luck here.
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
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
#7
Update:
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.
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#9
Never seen before but pricey.. I will monitor the performance on my setup for a couple more months and have to decide in the summer when the heat reaches 95F in Florida.
Capacity in my setup is only 1.6~1.7 gallons which seems kinda small.
Do you know what is the capacity in a Vete or Camaro?
Capacity in my setup is only 1.6~1.7 gallons which seems kinda small.
Do you know what is the capacity in a Vete or Camaro?
#11
TECH Resident
iTrader: (6)
I have tried running distilled water plus an additive to reduce temps but like stated above the issue we ran into was the antifreeze does raise the boiling point of water and even with the benefit of the cooler temps, on the road course temps still got hot enough to boil and cause excessive air in the system which caused overheating issues. Now this was in a GR40 03 Cobra but we have since went back the factory coolant specs and have yet to experience a problem. I would recommend some dexcool.
#12
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
#13
TECH Addict
iTrader: (2)
A 160 degree thermostat may not hurt anything in your particular application, but I do not believe a thermostat can reduce the operating temperature of a cooling system that otherwise has insufficient capacity.
http://www.carnut.com/ramblin/cool3.html
http://www.carnut.com/ramblin/cool3.html
#14
TECH Senior Member
Coolant...
Since you're experimenting with coolant, have you tried these:
- 50/50 water and Prestone All/Extended,
- water and Redline water wetter.
I think you would be better off with a 180 thermostat.
What is the capacity of your cooling system (with the wing mount)...?
- 50/50 water and Prestone All/Extended,
- water and Redline water wetter.
I think you would be better off with a 180 thermostat.
What is the capacity of your cooling system (with the wing mount)...?
#15
TECH Senior Member
Oil...
What is the intent/purpose of your car...?
I think your oil temp is getting a bit high... when does it get that high...? what oil do you use...?
Is there a way to modify the inside of the fender well to give your oil cooler more airflow...?
I think your oil temp is getting a bit high... when does it get that high...? what oil do you use...?
Is there a way to modify the inside of the fender well to give your oil cooler more airflow...?
#17
Coolant has very little effect on boiling point, at most like 10 degrees on a 50/50 setup. I agree that your oil temp isnt getting too high, at what temp are your fans set to come on, isnt stock like 212? IT sounds like your system is working pretty well actually.
Mark
Mark
#18
TECH Senior Member
#19
TECH Senior Member
Water will evaporate at temperatures well below its boiling point... but the oil does have to get sufficiently hot to function correctly, but not sufficiently hot to get burnt.
See "Engine Oil Coolers" here: http://www.perma-cool.com/Catalog/Cat_page02.html