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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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ChrisFoley |
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#2
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I am Tangerine Racing ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 7,937 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None ![]() ![]() |
Harve,
The problem has nothing to do with the cooling system. If the oil is heating up that fast it isn't even going thru the cooler. With such low oil pressure I believe the problem has to be in the primary oil circuit. Maybe the oil relief piston isn't seated in the bore and is allowing a high percentage of the oil back into the case before it sees the cooler or the bearings. Even with the oil at 230F the pressure should be at least 25psi at 3000rpm. If the bearing clearances were excessive the pressure would be low but the temp wouldn't go up so quickly. What is the oil pressure when cold, at idle and at 3000rpm? It should be in the range of 60-80psi. |
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