tjkj2002 wrote:
geordi wrote:
Yeah, diesels with a higher heat load? That's comedy right there. No way those trucks are making that kind of waste heat unless they did something STUPID in the design or the programming. With a 10 speed transmission, I can't wait to see the actual economy numbers, but they will be using so little fuel that keeping them warm will probably be an issue again.
They seem to recognize this by having electrically-controlled grill closure as referenced in the article. No reason for that unless your design is too cold.
For someone that thinks they know alot about diesels you really don't have a clue.
Take one towing 12,000lbs up some of the passes here in Colorado your going to be creating alot of heat,even in colder weather.
I spent 10+ years working on diesels and one had a 5'x5'x10" radiator,85 gallon system,and only 736 cubic inch displacement. 5' hydraulic fan that pulls more air then 20 of your CRD's,and can tell you that would have issues with heat when pushed hard.
Forget trying to talk to geordi... for several reasons.
1) I believe he is only on this thread because he has seen that I have posted a reply here, and wants to bait me.
2) geordi lives in Florida, and appears to have little understanding or appreciation as to how ambient temperature affects the efficiency and long term reliability of diesel engines. His local temperature range throughout the year is much less than those of us in other parts of the North American continent. In Alberta, out temperature range can be as much as +90 degrees to -45 degrees Fahrenheit throughout the year... diesel vehicle operators here KNOW intimately how this can affect a diesel engine. geordi does not live in this environment, and therefore is ignorant of the issues. Diesel engines do indeed create very little heat when they are idling, but they can also create tremendous amounts of heat when they are working hard. Ambient temperatures have an affect on this, and therefore tighter control of engine cooling system operating temperatures must be maintained in comparison to gasoline engines; radiator shutters help accomplish this. This does not preclude the use of radiator shutters on gasoline engines, it is simply a statement on my part that makes the argument that radiator shutters are more important on diesel engines. It has been known for a long time that engine temperatures actually drop when you are idling in cold weather after driving at full operating temperature... this is caused by the mechanical cooling fan blowing frigid cold air over the engine, overcoming the lesser heat produced by the engine during idling vs. the much greater amount of heat created when the engine is actually working.
3) There have been many, many diesel engines manufactured that have excellent reliability and efficiency records and that use radiator shutters. geordi's assertion that there must be a design problem with the engine because those shutters are present is typical geordi. He seems to think that he knows more than the engineers who designed the new Ford engine, just like he does with the Liberty CRD engine. He claims that the design is too cold, and makes no reference to any specific part that would cause this; hence I believe he is talking out of his rear end, as usual.
4) If indeed it turns out that the new Ford diesel engine is running too cold, the likely cause will be because of EPA mandated NOx emissions standards that have forced Ford to put in a thermostat that opens up at too low a temperature. This would be done because it is well known that NOx emissions are lowered with lower operating temperatures. Unfortunately, if this turns out to be true this will have a detrimental effect on the efficiency and reliability of the engine. This scenario is one of the modus operandi of the Liberty CRD.
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