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Join Date: Jun 2002
Location: New Hampshire
Posts: 724
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Oil thermstat
I've been having problems with my engine running warmer than normally and was wondering if the oil was getting to the front oil cooler as it should. So I removed the side cap from the side of the thermostat and took out the spring and plunger. But before I could test in boiling water I put the cap back on without the spring and plunger. Now the oil does not go to the front oil cooler at all. My thinking was like the with old V-8 water pumpers where you could pull the thermostat out and let the fluid run continuously. Is it necessary to have the spring and plunger in there at all times.
Tom
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Ice Green '77 Targa 3.6 w/ Steve Wong chip One Way To Get More Horsepower Is To Get A Bigger Horse! "I couldn't find the sports car of my dreams, so I built it myself" Ferdinand Porsche |
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04-16-2006, 04:04 AM
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well, it was certainly designed the way it was for a reason..and that's so the engine could reach 'operating temp' (180), open an aux thermostat and have the oil travel to the front cooler to maintain it as best as possible. without it, it may take a while to get the engine properly-warmed and would certainly be undesireable in winter driving conditions where you have trouble ever getting that close to operating temp to begin with! i'd put it back in. you should be able to feel the front cooler with your hand to tell if hot oil's in it or not. if your gauge is reading hot, like say 220+ and the aux cooler isn't hot to the touch, i'd suspect the thermostat isn't opening..
ryan
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To the memory of Warren Hall (Early S Man), 1950 - 2008 www.friendsofwarren.com 1990 964 C4 Cabriolet (current) 1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold) |
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04-16-2006, 09:36 AM
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Join Date: Jun 2004
Location: Friendswood, TX
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I think the aux cooler thermostat (one in the right rear wheel well) works like a bypass. When cold oil goes from the engine to the tank. When hot, oil goes from the engine to the front cooler and then to the tank. When you pull the plunger out, the path of least resistance is to the tank and you don't get any (or much) to the front cooler. Different than in a water cooled thermostat where the path of least resistance is to the radiator.
May be total "male answer syndrome" but I had to try.
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04-16-2006, 09:52 AM
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Location: New Hampshire
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Thanks for the responses. Winter driving is not an option here in New England that is why I don't have a concern on wheather or not I'll get to operating temps. I did put the plunger in boiling water and at 180 degrees it did open up. I put it back in and at 180 degrees the oil went to the front cooler. For what ever reason the plunger does have to be in there for the oil to go to the front oil cooler.
Tom
__________________
Ice Green '77 Targa 3.6 w/ Steve Wong chip One Way To Get More Horsepower Is To Get A Bigger Horse! "I couldn't find the sports car of my dreams, so I built it myself" Ferdinand Porsche |
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04-16-2006, 04:48 PM
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yeah, the aux thermostat opens at 180 degrees per my books..
ryan
__________________
To the memory of Warren Hall (Early S Man), 1950 - 2008 www.friendsofwarren.com 1990 964 C4 Cabriolet (current) 1974 911 2.7 Coupe w/sunroof 9114102267 (sold) 1974 914 2.0 (sold) |
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04-16-2006, 06:16 PM
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1974 Porsche 911 2.7
