Diesel vs gas

[buickanddeere]

Please explain how that makes a difference?

If you don’t know the difference between a 1994-2003 port injected gasser of that era and a direct injected gasser now. Vs a 1994-2003 Tier I Diesel then vs a Tier IV diesel now . How can I explain it to you ?

 

[buickanddeere]

Duty cycle on Diesels are much lower than on gas motors.

The diesel can work half as hard to produce the same power, which is reflected in RPM's.

Diesels always win in this debate...

Please come up with some numbers to support your Straw Man argument that diesels work half as hard to make the same power .

 

[searcyfarms]

I would go diesel any day of the week, i own 6 diesel engines and would not take a gasser in place of any of them - they have their place

 

[ovrszd]

If you don’t know the difference between a 1994-2003 port injected gasser of that era and a direct injected gasser now. Vs a 1994-2003 Tier I Diesel then vs a Tier IV diesel now . How can I explain it to you ?

Obviously YOU can't.

 

[ovrszd]

Please come up with some numbers to support your Straw Man argument that diesels work half as hard to make the same power .

Why should he, you didn't.

 

[Snobdds]

Please come up with some numbers to support your Straw Man argument that diesels work half as hard to make the same power .

Take two engines, gas and diesel, of the same displacement...say 6.0 liters each.

Say your target torque, ignoring HP for simplicity sake, is 300 Hp. The diesel can achieve this by only using 50% rated power and 2500 RPM. The gas can achieve this by having to use 90% rated power and 4500 RPM. Duty cycle is a generic term, but once you start calculating by engine load factors...you can see just what engine has to work harder to achieve the target torque for a given application.

 

[ovrszd]

Take two engines, gas and diesel, of the same displacement...say 6.0 liters each.

Say your target torque, ignoring HP for simplicity sake, is 300 Hp. The diesel can achieve this by only using 50% rated power and 2500 RPM. The gas can achieve this by having to use 90% rated power and 4500 RPM. Duty cycle is a generic term, but once you start calculating by engine load factors...you can see just what engine has to work harder to achieve the target torque for a given application.

Well stated. That was my point 30 posts ago. Let the gasser dog pile begin.

 

[MossRoad]

Take two engines, gas and diesel, of the same displacement...say 6.0 liters each.

Say your target torque, ignoring HP for simplicity sake, is 300 Hp. The diesel can achieve this by only using 50% rated power and 2500 RPM. The gas can achieve this by having to use 90% rated power and 4500 RPM. Duty cycle is a generic term, but once you start calculating by engine load factors...you can see just what engine has to work harder to achieve the target torque for a given application.

How does that explain these numbers from my IH owner's manual?

Pulled out my IH2500b manuals.

It was available with either a 200 cubic inch gas engine or a 239 cubic inch diesel engine.

With gears transmissions:
Full load engine speed for both engines is 2200 rpm.
High idle for the gas is 2420 rpm and the diesel is 2480 rpm.

With hydrostatic transmissions:
Full load engine speed for both engines is 2400 rpm.
High idle for the gas is 2640 rpm and the diesel is 2650.

The bore on the gas is 3.812 and diesel is 3.875.
Stroke is 4.39 gas and 5.06 diesel.

So, the diesel requires a larger bore and stroke and HIGHER rpms than the gas engine.

 

[searcyfarms]

diesel, i don't have to run my engines near as hard to get my work done and listen to screaming gas engines slurping fuel - for instance - growing up drove a 706 gasser for one particular farmer...........big gas engine, filled it up twice a day - that same farmer i worked for drove the 856 diesel, he only filled up every morning - i don't think his 856 worked near as hard, my ears were ringing every night from listening to that 706 scream all day but it never failed me it was just loud n thirsty, so when my wife hollers at me i say, HUH, don't forget honey i have tractor ears!!!

 

[Snobdds]

How does that explain these numbers from my IH owner's manual?

Pulled out my IH2500b manuals.

I don't think there is enough info here to do a direct comparison. The cubic inches are different, and there is no rated Hp or Torque to make a projection load factor.

Fuel is one way to measure power, assuming stoichiometric fuel ratios and consumption rates, but I doubt IH has those figures accessible.

But you want an educated guess? The gas engine is using a whole lot of fuel to do what the diesel will do for far less. Beyond that, those two rotating assemblies are probably pretty equal in output.

Edit: Walked away and came back to reply, but ^^searcyfarms hit it right on.