Diesels at high and low altitudes..

SkyPup · Dec 12, 2006

orezok said:
Most diesel engines are derated at sea level (that is underfueled to promote longevity). They most likely do not reach their "rating" until some altitude where the F/A ratio drops to less than optimum.

Any "Facts" from the numerous Diesel Engine Manufacturers and Fuel Injection Equipment Manufacturers that Oresok can provide us as to why they are selling their engines and equipment to us to not work properly at sealevel and sprew out excess pollutants until you magically elevate them to the correct nonpolluting altitude, as Oresok theoretically hypothesizes (fantasizes)...... ? Maybe the FAA regulates at what altitude they become fully rated at????

LOL

Dargo is correct, diesels are even more sensitive to altitude power loss.....

orezok · Dec 12, 2006

There are numerous after market companies that sell products that increase the output of Dodge, Ford and Chevy diesel engines. Just about all of them accomplish this by increasing fuel. Do you think the original equipment manufacturers who warrant their equipment design them to produce the maximum amount of power or do they design a product that they are 100% assured will last through the warranty period. Yeah, they're derated.

If you believe the former...

SkyPup · Dec 12, 2006

Very interesting facts that you have presented!!

Who makes all these OEM derated diesel engines for Dodge, Ford, and Chevy so that these diesel engines can all make it it 100% throught the warranty period without any claims simply by injecting less fuel into them.....?????

orezok · Dec 13, 2006

Time to stick a fork in it...

KICK · Dec 16, 2006

orezok said:
Time to stick a fork in it...

before they stick a fork in you.

a pitchfork.

I been away all week, I thought this thread woulda died.

I think anybody who believes in higher power with less air also tends to believe in the tooth fairy and is a card carrying member of the flat earth society.

orezok · Dec 16, 2006

ahh... you know me well.

I wouldn't have won a number of championships including Texas state midget championship with an "only the experts know" attitude. You never know what "can't be done" until you try.

If you never vary from the known "facts", the patent office would have closed decades ago!

Now who else is a member of the flat earth society?

cp1969 · Dec 16, 2006

Me...

KICK · Dec 17, 2006

problem aint so much going against experts as going against physics.

sounds more like a religion with some people, they just believe and don't let facts get in the way.

orezok · Dec 17, 2006

I agree, the laws of physics in a pure sense never changes, but the applications of those laws is totally variable.

Some people believe that only their application is the correct application.

An example (and I appologize as this does not relate to a diesel forum), in alcohol injected engines (the ones I am most familiar with), the more fuel you add the cooler the engine will run. This is a fact that I have observed many times.

Enrichen a diesel engine and it gets hotter, enrichen an alcohol engine and it gets colder. A conflict of physics? I think not, just a change of application.

The bottom line is that there is no one correct answer to any question.

SPYDERLK · Dec 17, 2006

KICK said:
as diesel engines go, the idea of lean or rich doesn't apply.

they dont run on any particular fuel mixture, as compared to a gasoline engine which will only run when the air/fuel ratio is within a certain range.

fact is the amount of fuel injected on a diesel determines the engine speed and the power output, up to the governed speeds or the limits of the engine and fuel system design.

example--- your running at full throttle and steady load and you start climbing a hill, the governor will allow more fuel to be injected to try to keep that engine at governed speed. if you reach the point where the engine starts losing speed but you still have it at full throttle, you will still be injecting the maximum mount of fuel , keep losing rpms in this ituation and the engine will start to smoke. you could do this until the point where the engine stalls, you will be pouring fuel in it but it just cant make enough power to continue.

Im with you guys about the slight leaness in max fuel to diesels at sea level and how in that case max avail power would be constant for awhile as altitude was increased.

Kick, in your example, Why does smoking start well below max rpm under full power rather than sooner or much later? I would assume the longer time avail for burning would prevent unburned fuel until very low rpm acted to reduce mixing turbulence. Maybe this effect is more critical than I thot?
Larry