Diesel Tractor, Hot hot is too hot? Im a newbie

[Dargo]

I honestly do not know anything about the volume of air ingested in comparing a diesel to a gasoline engine. I do, however, know that all gasoline engines pretty well need to run at a 14:1 air to fuel ratio whereas a diesel can lean out to 50:1, or more, air to fuel at idle with no problem. The diesel engine has a far more variable air to fuel mixture range. In general terms, that is why a diesel engine normally runs cool at a low idle; it's mostly running as an air pump and all that air helps cool the engine. The reason being is that very little BTU's of energy are being produced on comparison to the volume of air. At a relatively constant 14:1 ratio, a gas engine will burn far more energy, creating far more heat at an idle. Still, run a diesel engine at full throttle and under a full load, to where it is dragging the engine down, and watch the temp climb rapidly. Guys hopping up diesel engines without a EGT gauge can easily melt some expensive parts doing just that.

 

[Transit]

Dargo, a hint, a gas will fill the volume that contains it.

 

[Jriffe108]

Well, it appears that somebody was unhappy with my post, whatever happened to the first amendment? Oh yeah, thats right, it only applies to us Americans.

Well, to sum up my earlier post, pretty much dont comment on the post unless you have something valuable and relevant to the topic.

Naturally Aspirated diesel engine ingest the same amount of air as a comparable sized naturally aspirated gasoline engine. If anybody out there has proof otherwise, please provide the details here as I would love to learn something new.

 

[SPYDERLK]

Well, diesels do not use any more air than a gasoline engine of the same displacement.

That's true if the gasser is at WOT. At less than WOT, a gas engines throttle plate limits airflow through the engine while diesels have no such restriction.

A properly tuned carburated spark ignition engine operates with measurable intake manifold vacuum.
A properly tuned and maintained naturally aspirated diesel engine does not.
A supercharged or turbocharged diesel engine operates with positive intake manifold pressure.
These facts ensure that under almost all operating conditions, a diesel of equal displacement will flow more air than a carburated spark ignition engine.

If you are a mechanic or engineer and do not understand this, you should.

In part, we are talking about two different things. We speak of ingesting air, but the mention of cfm also comes up. Yes, a 100 cubic inch cylinder will contain a 100 cubic inches of air regardless of the engine type. But we need to correct both or those cylinders to STP to make a true comparison. For the non-engineers, STP is standard temperature and pressure. Obviously, those two items are different in every engine.

You already posted the reason why...



It's strange you can make the first (wrong) statement and then contradict it by making the second (correct) statement
in the very next sentence.

Well, it appears that somebody was unhappy with my post, whatever happened to the first amendment? Oh yeah, thats right, it only applies to us Americans.

Well, to sum up my earlier post, pretty much dont comment on the post unless you have something valuable and relevant to the topic.

Naturally Aspirated diesel engine ingest the same amount of air as a comparable sized naturally aspirated gasoline engine. [If anybody out there has proof otherwise, please provide the details here as I would love to learn something new.]

Ample effort and pertinent concise explanation has been provided. No reason to bother further. You cant get past your adamant misunderstanding of the Physics.
larry

 

[KennyV]

I would love to learn something new.

It would appear you have missed that opportunity...

 

[knightrider955]

Well I got another question. Do I need to put any kind of additive to the fuel for the winter monthes or to store it? Or is there something I should add just as routine maintenance??

 

[banjodunn]

G'day just to stir the pot a bit more what happens to manifold vaccum in a supercharged/turbocharged petrol engine????:thumbsup:


Jon

 

[Transit]

G'day just to stir the pot a bit more what happens to manifold vaccum in a supercharged/turbocharged petrol engine????:thumbsup:


Jon

your question has the answer built-in.

 

[mostly_gas]

Well I got another question. Do I need to put any kind of additive to the fuel for the winter monthes or to store it? Or is there something I should add just as routine maintenance??

I have started using additive to add lubricity to my fuel with a 30 year old tractor and rumors that the low/ultra low sulfur fuels may not lube my injectors completely. The additive also reduces fuel gelling in the winter. Not sure if it acts as a fuel stabilizer, maybe someone else can comment on that.

 

[KennyV]

I have started using additive to add lubricity to my fuel

I have been blending bio diesel with mine, to around 5 percent for the lube missing in fuel... Now that we are heading into colder days I will most likely start adding power service also... KennyV