Diesels at high and low altitudes..

[SkyPup]

No problem, your welcome to your opinion that diesel engines are LESS affected by altitude change than gas engines.

I could only get my Volkswagen TDI up to 108 mph during the 4 miles on the top end run at Bonneville due to the elevation when I raced it there, but it easily made it up to 135 mph at sea level........

 

[cp1969]

Let me know next time you hear any diesel airplanes flying overhead too!

I haven't heard them but this company hopes we will. DeltaHawk Diesel Engines Here's another: zoche aero-diesels homepage

There were some diesel a/c engines in the 30's or so, mostly European I think.

BTW, Audi won LeMans this year with a diesel, though I don't know what it's redline might have been.

 

[Doc_Bob]

Why isn't the fuel burned? There is still plenty of O2 to go around.

With a turbocharger, it is all burned.
Bob

 

[KICK]

No problem, but if TIME is not an issue with diesel combustion, why won't it do 15,000 rpms in an F1 engine like a previous poster prescribed?

a F1 engine is an extermely oversquare gasoline engine with an ultra short stroke, the best lightweight,high strenth componenets money can by.

there arent too many piston engines in the world that spin 15000 rpm?

there is a theoretical limit in piston speed , long stroke engines like diesels have higher piston speeds in feet per minute than a shorter stroke engine at a comparable RPM.

the amount of rpms most diesel engines can turn is also limited by the mass of the reciprocating parts, which are heavier and more robust than their gasoline engined counterparts.

one factor that never changes is the amount of time the fuel takes to burn , but a diesel engine cannot inject the fuel at 90 degrees before tdc on the compression stroke, while a F1 engine can run 90 degrees of advanced ignition timing in order to give the fuel enough time to burn.

 

[KICK]

With a turbocharger, it is all burned.
Bob

turbcharged engine will smoke.

any diesel engine with good compression and good injection system will burn all the fuel .

with turbo or not.

too much fuel and you get black smoke, its still burning it, just not completely.

 

[Dargo]

Actually, my grandfather told me of being scared to death as a child when hearing the deafening thunderous roar of 4800 horse power diesel engines overhead. Yes, diesel. You may have heard of the flying diesel powered beast, it was called The Hindenburg. It was powered by 4 reversible Daimler-Benz 1200 horse power diesel engines. I could only imagine the sight and sound of such a huge machine making so much noise going overhead at a mere 500 feet off the ground!

 

[bx23barry]

Just for the record some f1 engines were turning 19,500 last year. This is very simple thing, less avaliable 02 = less power, but you guys go ahead and fight over it.

 

[cp1969]

JThis is very simple thing, less avaliable 02 = less power, but you guys go ahead and fight over it.

Oxygen doesn't produce power. Fuel makes power. A gas engine makes less power at altitude because it can send no more fuel than what the max rich fuel air ratio dictates. Now tell me how a diesel engine running 35:1 doesn't have enough oxygen to combine with the available fuel, which did not decrease.

 

[KICK]

oxygen does not produce power but it is necessary for combustion.

the more oxygen you have , the more combustion you can support in a given volume .

why did a blacksmith use a bellows to force air into his furnace?? to make the fire burn more fuel and produce more energy.

if you supercharge an engine, you increase the volumetric efficiency, or you make it capable of having more air than it could normally get, if it was naturally aspirated. why do they do this?????? so they can burn more fuel and get more power.

turn the equation around.

High altitude.

less atmospheric pressure.

less atmospheric pressure mean a lower amont of oxygen molecules in a given volume of air.

won't support as much combustion.

compression ratio is effectively lowered

cylinders wont fill as completely

can only burn so much fuel in that amount of air.

less power because less fuel can be burned and less energy created.

 

[KICK]

but you guys go ahead and fight over it.

I dont know who is fighting about it but some people sure dont get it.

either they dont get it or they are just stirring the pot .

sometimes I think to myself, nobody can be that dumb???!!!, but then I realize that they can.

in a certain sad way this is funny,, that people don't understand the obvious.