The resulting stress, can distort the head and make it swell, in areas that the are hottest. Heat makes aluminum swell, almost three times faster, than cast iron. A blown head gasket, can also be a result of overheating. Hot spots, can also be very damaging and burn holes, right through the top of pistons. The erratic combustion can cause detonation as well as engine run-on, in older vehicles with carburetors.
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Hot spots develop inside the combustion chamber that become a source of ignition for the fuel. Overheating can also cause, pre-ignition. If the detonation problem persists the hammer-like blows, may damage the rings, pistons or rod bearings. Because, the combination of heat and pressure, exceed the octane rating of the fuel. The engine will ping and start to lose power, under load. If the engine overheats, the first thing that will happen is, a gasoline engine will start to detonate. Consequences, Of Your Radiator, Overheating That’s why, anytime temperatures climb beyond the normal range the engine is running, in the danger zone. As a result, they are very vulnerable, to heat damage. Such engines don’t handle higher than normal temperatures well. Plus, many engines today, have aluminum heads with overhead cams. Valve stem-to-guide clearances are also closer, to reduce oil consumption and emissions. Piston-to-cylinder clearances are much tighter, to reduce blow-by for lower emissions. A radiator cap rated at 15 psi will, increase the boiling temperature, of a 50/50 mixture, up to 265 degrees. A 50/50 mixture of water and ethylene glycol antifreeze in the cooling system, will boil at 225 degrees. So, How Hot Is Too Hot Temperature Gauge Reading Too HotĪ relatively constant operating temperature, is absolutely essential for proper emissions control, good fuel economy and performance. They’ve realized some significant gains, but, ceramics are still too expensive for everyday applications. Engineers have been tinkering with exotic ceramic materials and metallic-ceramic alloys in an attempt to build high-temperature, super efficient engines. But, there’s a limit, because aluminum pistons and heads, can only get so hot before they soften and melt. Ironically, the hotter an engine runs, the more efficient it becomes. So, the average gasoline engine, is only about 22 to 28 percent efficient.