B3200 Vibration Update

[leonz]

The position you found the fuel pump in proves again that they mess with them when they are checked for emmissions levels. So now a lot fuel and power is wasted to comply with the EPA regulations for "lawn mower exhaust".

I will have to look up the E.P.A., emmisions levels for the riding lawn mowers again and post them here.

The files are too large to post here.

 

[diesel466]

No you will not break it.

Things to remember within which your diesel does work to provide energy.


1. The throttle controls the fuel delivery to provide power to do work.

2. The injection pump provides a METERED amount of fuel per revolution of
the crank gear that rotates the injection pump to provide fuel to each
cylinder or one cylinder.

3. The fuel delivery adjustment screw provides a metered amount of fuel
through the fuel rail to the INDIVIDUAL INJECTION NOZZLE which directs
the fuel to the top of the first individual cylinder when it is in the INTAKE
portion of the 4 cycle combustion process. The second and third or fourth
cylinder recieve the fuel the same way per revolution of the injection pump
drive gearing.

4. Any unburned fuel which not pulled in the top of each cylinder combustion
chamber is pumped back to the tank and recirculated when the individual
cylinders fuel inlet port is closed upon the completion of the combustion
portion of the 4 cycle combustion process and as a side benefit and the
fuel is is heated by the engines high temperature created during the
combustion process which reduces gellng at lower temperatures.

5. The engine timing is the same no matter what or it will not work
effectively as diesel fuel must be compressed and then explode to provide
the down force to propel the other cylinders in the drive train or a single
cylinder. The crank lobes are machined and balanced according to the
engine design and number of cylinders which requires the PROPER position
of the cylinder piston per revolution just like a gas engine BUT as Gasline
is combustable it burns much more easily which is what a diesel fueled
engine is unable to do with gasoline to run effectively at a 100 percent
volume of gasoline and diesel fuel cannot be used for fuel in a gasoline
engine because of the diesel fuels actual combustion requirements.

a. A reduced amount of fuel(even a minor reduction) delivered per rotation of
the injection pump will not allow the engine to operate at full power PER
CYLINDER no matter the throttle setting does not allow the entire drive
train to propel the crank shaft to provide full power per revolution.

b. The timing is the same and unchanged BUT the power delivery is what is
affected which creates the excess vibration within the power unit as the
drive train is not allowed to deliver full power per cylinder WHICH reduces
the speed of the cylinder ever so slightly due to the use of diesel fuel and
its required compression and explosion to create energy.


think of your engine as a spring driven clock the less spring tension you have
delivers that much less energy -fuel to power the clock which becomes slower.




I want everyone to succeed and not fail.

A diesel engine injects fuel at top of compression stroke NOT on intake stroke, the fuel is not compressed in the cylinder. And I am not following the thing about unburned fuel being somehow being sucked out of cylinder?

 

[leonz]

Indirect injection diesel engines continually pump a fuel stream to all cylinders
taking a small amount for each cylinder from the fuel stream as it passes by.


and the excess is pumped back to tank on the return fuel line.



My duetz diesels were 4 stroke indirect injection diesels like the kubota models currently and are very simple in design and there maintenance as they have injection nozzles.


So.....

Four cycle engines have intake, compression, power, exhaust as the four cycles.


1. intake, air and diesel fuel are delivered as the piston pulls the intake air and fuel into the combustion chamber.


2. compression, the piston rises and compresses the diesel fuel and air until the metered fuel is compressed to the point it explodes and consumes the that was pushed or pulled into the air intake via the valve train.

3. power, the piston is driven down by the force of the explosion from the compression of the diesel fule and the air that it consumes.

4. exhaust, as the piston reached bottom dead center the exhaust valve is opened and the ehaust is ejected.

 

[diesel466]

A 4 cycle diesel kubota injects fuel at the top of compression stroke. Not on intake, only air is compressed. Sorry but you are wrong. I do not want to start a war here but lets get people the facts.

 

[kuboman]

A 4 cycle diesel kubota injects fuel at the top of compression stroke. Not on intake, only air is compressed. Sorry but you are wrong. I do not want to start a war here but lets get people the facts.

Pheww....somebody understands it.

 

[leonz]

Ok then, why is diesel fuel and intake air compressed to the point that the molecules react with an explosion to drive the piston downward??????????????????/

 

[diesel466]

Ok then, why is diesel fuel and intake air compressed to the point that the molecules react with an explosion to drive the piston downward??????????????????/

Because it is not, As the piston moves down air is drawn into cylinder and compressed as piston moves up. The fuel is pressurized by the injection pump, when the piston nears tdc. The injector opens because a preset psi has been reached. The fuel is then sprayed into the hot compressed air, causing the explosion to drive the piston down.

 

[jeepfreak1972]

Exactly.

 

[Redneck in training]

Because it is not, As the piston moves down air is drawn into cylinder and compressed as piston moves up. The fuel is pressurized by the injection pump, when the piston nears tdc. The injector opens because a preset psi has been reached. The fuel is then sprayed into the hot compressed air, causing the explosion to drive the piston down.

I wouldn't call it explosion. The fuel burns gradually as it is injected and the crank turns. It takes only few milliseconds so it looks like explosion. The engine performs the best when the force of expanding gases is applied gradually during the stroke. Diesels can't ping unless the timing of injection is wrong.
Explosion happens when all the fuel ignites instantly in the whole volume even before the spark. It caused pinging in gas engines.

 

[jeepfreak1972]

I think he was using explosion as a generic term that everyone would understand. But yes you are correct. The fuel ignites at the point of injection and a flame front moves out in all directions like a wave.