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57lincolnman |
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#1
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Member ![]() ![]() Group: Members Posts: 174 Joined: 14-September 10 From: Los Angeles Member No.: 12,175 Region Association: Southern California ![]() |
Recently completed rebuild of 1.8L and it's running too hot. Oil temps climb to 230 with only about 10 minutes running. It doesn't matter how the engine is loaded. Items to consider: 1) case cleaned and checked for alignment; 2) LN pistons installed at 96mm with new Nickie cylinders; 3) cylinder heads (1.8L) cleaned and set for 8.25:1; 4) new connecting rods; 5) push rods check out OK; 6) car did not previously have thermostat or cooling flaps, so these were installed. Thermostat opens as it should at 180; 7) Air/fuel ratio is 12-14 and within spec; 8) engine timing within spec; 8) mild cam upgrade. 9) crankshaft and flywheel were balanced; 10) all engine tin is in place
Could it be that the engine cooling flaps are not working or reversed? All thoughts and commentary are welcome. This one has us baffled. |
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mrbubblehead |
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#2
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Twodollardoug ![]() ![]() ![]() Group: Members Posts: 1,155 Joined: 17-December 10 From: calimesa ca. Member No.: 12,492 Region Association: Southern California ![]() |
what weight engine oil? could be high oil pressure is bypassing the oil cooler.
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57lincolnman |
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#3
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Member ![]() ![]() Group: Members Posts: 174 Joined: 14-September 10 From: Los Angeles Member No.: 12,175 Region Association: Southern California ![]() |
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mrbubblehead |
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#4
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Twodollardoug ![]() ![]() ![]() Group: Members Posts: 1,155 Joined: 17-December 10 From: calimesa ca. Member No.: 12,492 Region Association: Southern California ![]() |
what weight engine oil? could be high oil pressure is bypassing the oil cooler. Good point. I need to check with engine builder as to what he is using. I know that it is a Brad Penn racing oil that he's using to break in the engine. I'll get back to you. many believe they HAVE to run 50 wt. which all they are doing is creating heat and throwing away horsepower. you should taylor your oil weight to your psi and rpm. this is with full group 4 or group 5 (ester) synthetics. i think the bypass spring is set up for around 46 psi. racer chris or jake would know exactly. anyways when you are at high rpm, oil pressure is high esspecially with thicker oil. the engine goes into protection mode and bypasses the oil cooler to protect it. high pressure = resistance and heat. lower oil pressure = more flow. (too a point) |
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