Why do modern engines run so hot?

Why do modern engines run hotter?

Why have manufacturers put hotter thermostats in their engines? … TOM: Engines burn fuel more cleanly and efficiently at higher temperatures. With the coolant at 195 degrees (instead of the more traditional 170-180 degrees), for instance, you’ll get better performance, less pollution overall, and greater fuel economy.

Do modern engines run hotter?

The short answer is YES they run hotter. The whys make it a longer answer. Back in the day cars ran between 160 to 180, in modern engines the manufactures have increased those ranges by 30 degrees on both sides.

Why do some engines run hot?

Engines can overheat for many reasons. In general, it’s because something’s wrong within the cooling system and heat isn’t able to escape the engine compartment. The source of the issue could include a cooling system leak, faulty radiator fan, broken water pump, or clogged coolant hose.

Is a hotter engine more efficient?

The hotter the engine runs, the more efficient it is, that why modern cars run at 230 degrees. Remember, if you have a 195 stat, it just starts to open at 195, it isn’t fully open until it’s much hotter. Today’s cars also run much higher pressure systems.

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What makes more power lean or rich?

If one considers the tipping point between lean and rich as whatever air/fuel ratio yields the best power, then again, slightly rich is most likely the answer. You’ll loose some power vs. your best power ratio but probably not as much as if you went to the lean side.

Is it better to run lean or rich?

Running lean can give you more power but to lean will blow your engine. Running too rich can also hurt your motor. Think of it when you are mixing gas for your weed wacker. It is always safe to add a little more oil than not enough to the mixture.

Is lean hotter than rich?

One is that an engine running lean—meaning too much air is going into the cylinders—tend to run hot. Jason Fenske of Engineering Explained busts that myth in this video. … Temperatures actually tend to peak with that ideal ratio, decreasing both when an engine is running lean and when it’s running rich, Fenske said.

Is 230 degrees to hot for an engine?

As temperature of an engine exceeds 230 degrees Fahrenheit, the engine is overheated. Above 245 degrees Fahrenheit, damage may occur. As heat continues to increase, the different rates of thermal expansion cause metal to distort. … The engine coolant is overheating if it’s around 240 to 250 degrees.

Why is lean bad for engine?

A lean mixture occurs when there’s a higher concentration of air to fuel than there should be. When this occurs, your engine will likely still run but will result in jerking motions within the mechanics of the combustion engine which in turn leads to damage to the engine, such as burned valves.

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What are the signs of a blown head gasket?

Bad head gasket symptoms

  • White smoke coming from the tailpipe.
  • unexplained coolant loss with no leaks.
  • Milky white coloration in the oil.
  • Engine overheating.

How can you tell if you have a bad heater core?

Five Signs Your Car’s Heater Core Is Going Bad

  1. Fog Inside Your Car. Two things could be going on if you have fog inside your car. …
  2. Sweet Smells in the Car. The sweet smell in your car might not be your perfume or the donuts you’re taking to work. …
  3. Constant Engine Coolant Loss. …
  4. Cold Air in the Cabin. …
  5. Cold Cabin/Hot Engine.
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