Re: air charge cooler

Posted by buickanddeere on June 24, 2007 at 19:25:45 from (216.183.132.114):

In Reply to: air charge cooler posted by Big Hunter on June 24, 2007 at 11:26:04:

Combustion chamber pressure is obtained from the heat of burning fuel.
The greater the difference in the temperature of the gasses in the combustion chamber before combustion vs.after combustion.The higher the pressure.
If the combustion chamber temp is increasing say as a very rough example.900 degrees from 300F to 1200F. Then all is well and the engine won't melt.
Add enough fuel and increase the temp from 300F to 1400F with an inrease of 1100F, not good.
So use an intercooler and drop the intake temp to 200F.Add the same amount of fuel and now the exhaust temp is 1100F.
Now you can either leave it alone and send fewer oxides of nitrogen polution up the stack due to cooler combustion temps. This exhaust temp decrease without using EGR which drops combustion efficiency.
Or you can add enough fuel so the difference is now 200F to 1200F. = "more power" witht the "same"
max safe operating temp.
A safe 1000F temp and therefore a greater pressure increase vs. a safe 900F temperature and less pressure increase.

Don't loose any sleep. The engineers at the factory using literaly millions of dollars of very accurate test equipment. They found the engine runs fine and doesn't overheat without an intercooler.
And you get a cheaper tractor to purchase as there is no intercooler to buy.

Too cool an intake charge temp inder light/medium loads and combustion temps will be too low for clean combustion.

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