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jcwells |
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#1
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Newbie ![]() Group: Members Posts: 31 Joined: 13-August 09 From: Gunter, Texas Member No.: 10,669 Region Association: Rocky Mountains ![]() |
Hello, all...
I'm new to the 914 scene, but have been having a blast reading up on all of the information that is available here at 914world! I just got my 914 about six weeks ago (details in my signature), and have been able to get answers to a bunch of my questions by pounding on the search button. But here is one that I haven't been able to figure out on my own. The car is currently running on Brad Penn 20W50 oil, which is highly recommended by Jake Raby and others. Here on the Front Range in Colorado, as the weather has started getting a lot cooler, I've noticed that my oil pressures are quite a bit higher than in warmer conditions. Specifically, with ambient temperatures between 30 and 40 deg, I'm getting better than 120 psi oil pressure at 2500-3000 rpm after running for several minutes. As the oil warms (15 minute commute), it drops to a bit below 100 psi at the same revs. I've got a very efficient front mounted oil cooler, and my oil temperatures rarely get to much more than 200 deg in warm weather, and was maybe 120 deg this morning at the end of my commute. In hot weather, my pressure is just a bit more than 20 psi at idle after extended running, but better than 40 psi after my commute this morning. Couple of questions: 1. Are my hot weather oil pressures somewhat normal? 2. Are my cooler weather oil pressures too high? 3. Should I switch to the Brad Penn 10W40 now that the weather is cooler? Go easy on me, I'm a noob... (IMG:style_emoticons/default/smile.gif) |
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Jake Raby |
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#2
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Engine Surgeon ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States ![]() |
The stock pressure relief limits oil pressure to 85 PSI at max... If you are seeing more than that then either the pressure relief can't bypass enough oil (due to viscosity at that temp) or the pressure relief is not functioning correctly.
Your cold numbers would lead me to believe that the oil has too much viscosity but your warm and hot numbers are PERFECT. Where is the oil pressure being measured?? Has anyone updated the oil pressure reliefs with the aftermarket "High pressure" set up?? I hate those damn things. You will have to give up something here, if you swap to a lighter oil to help with the cold issues then you'll have lower pressures at operating temp. |
jcwells |
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#3
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Newbie ![]() Group: Members Posts: 31 Joined: 13-August 09 From: Gunter, Texas Member No.: 10,669 Region Association: Rocky Mountains ![]() |
Where is the oil pressure being measured?? Has anyone updated the oil pressure reliefs with the aftermarket "High pressure" set up?? I hate those damn things. Jake, I'm not sure where the oil pressure sensor is located. Can you tell me where it is on a stock motor? My guess is that it will be in that location. I also do not know about the pressure relief valve. Is that valve accessible from the outside of the motor? If so, are there any telltales that I can look for? The motor was built about a year ago by DTM Engineering there in the Atlanta area, using one of your cam/valvetrain kits, and with your race balancing. It runs beautifully! I guess that I'm trying to learn if there is any potential for damage when I see those high oil pressures, and if there are any downsides to switching to the 10W40 Brad Penn oil for fall/winter running. I am hoping to use the car as a "fair-weather" daily driver, since it is *so* much fun to drive! (IMG:http://i277.photobucket.com/albums/kk70/jcwellsq8/Porsche%20914/914motor_DTM.jpg) |
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Lo-Fi Version | Time is now: 10th June 2024 - 01:46 PM |
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