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

[Jriffe108]

Well, diesels do not use any more air than a gasoline engine of the same displacement. Diesels do have a higher compression ratio but no more air is inhaled. Diesels do run cooler than a gasoline engine, at least at idle and when first started they require a longer warm-up period.

Install a quality water temperature gauge and use an ir thermometer to confirm readings. You can expect the surface temp of a water jacket on the head or radiator to be 10-15% cooler than the actual temp of the fluid within.

A 50-50 mix is the only way to go as far as coolant mixture is concerned. As long as the rad is full, the bottom area should always be cooler than the top as the hot water enters the top and cools as it makes it way to the bottom.

Always run a thermostat, without one you will be running a rich mixture all the time and loading up the cylinders and crankcase with raw fuel cause the engine will run too cool.

Idle engine for approx 3 mins at ambient temps above 50 degrees followed by half idle (1500 rpm to 1800 depending on governor speed) for another 3 mins prior to full throttle or full load to ensure proper lubrication and warm up of metal alloys.

An overheating diesel is an indication of too much fuel pressure, a faulty cooling system (plugged rad, low flow water pump, or restricted flow in collapsed hose or thermostat) or incorrect engine timing.

 

[Mace Canute]

Well, diesels do not use any more air than a gasoline engine of the same displacement. Diesels do have a higher compression ratio but no more air is inhaled.

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.

 

[Jriffe108]

Say what? Lol

Engines size is determined by displacement, the amount of air space inside the cylinder.

For example, if given a 7.0 diesel engine and a 7.0 gas engine. If both engines idled at 600 rpm, the airflow is the same. A gasoline engine uses a throttle body with butterflies to control the airflow the engine, and fuel in a carb setting.

A diesel uses sensors to determine engine speed based on fuel injection, not requiring a throttle body.

At wide open throttle, the gas engine will almost always use more than the diesel based on the fact that diesels do not usually have the same redline as gas engines. And only based on this principle of RPM's. At any given comparable rpm, both engines with ingest the exact same amount of air based on the air pump (cylinders displacement) drawing the air in.

Now, this only applies to naturally aspirated engines as turbocharged diesels and supercharged gas engines have different amounts of boost which can significantly change the cfm of airflow.

 

[doall]

But a clogged air filter in a diesel seems to effect the engine more than it would a gas burner. I don't know, I'm kind of asking I guess. But you always hear that the filter is much more important in the diesels.

 

[Transit]

But a clogged air filter in a diesel seems to effect the engine more than it would a gas burner. I don't know, I'm kind of asking I guess. But you always hear that the filter is much more important in the diesels.

Yes, diesels glop tons of air. A clogged filter will limit that volume of air reducing hp.

 

[Mace Canute]

Jriffe108, I think you are having "one of those days".

 

[SPYDERLK]

Say what? Lol
At any given comparable rpm, both engines with ingest the exact same amount of air based on the air pump (cylinders displacement) drawing the air in.

Wrong.

 

[Jriffe108]

Well, it obvious that nobody here is a mechanic or an engineer. If ya'll truly believe that a diesel engine ingests more air than a comparable gasoline engine, than please, by all means, articulate that here with a detailed response.

As far as volumetric efficiency goes, it makes no difference due to the bore and stroke of the engines being identical. Although, valve size, engine (valve) timing, coefficient of drag along the intake manifold, and combustion chamber size and design are all contributing factors which may influence the total intake cfm, however, the variables indicated above with only amount to a small percentage of difference, and nowhere close to the 400% increase that was suggested earlier.

 

[RickB]

Well, it obvious that nobody here is a mechanic or an engineer. If ya'll truly believe that a diesel engine ingests more air than a comparable gasoline engine, than please, by all means, articulate that here with a detailed response.

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.

 

[Mace Canute]

Well, it obvious that nobody here is a mechanic or an engineer. If ya'll truly believe that a diesel engine ingests more air than a comparable gasoline engine, than please, by all means, articulate that here with a detailed response.

You already posted the reason why...

If both engines idled at 600 rpm, the airflow is the same. A gasoline engine uses a throttle body with butterflies to control the airflow the engine, and fuel in a carb setting.

It's strange you can make the first (wrong) statement

If both engines idled at 600 rpm, the airflow is the same.

and then contradict it by making the second (correct) statement

A gasoline engine uses a throttle body with butterflies to control the airflow the engine, and fuel in a carb setting.

in the very next sentence.