Job Perks

[J.J.]

Not really a perk, but our lube oil supplier has invited me for an all expenses trip to Shanghai for the Chinese F1 Grand Prix.

I know that traditionally you guys in the U.S. aren't very keen on F1, but I thought I'd share anyways as I'm real excited.

Now if only someone would invite me for an all expenses trip to Silverfest.....

[banshee04le]

Wow! Have fun dude. That should be interesting .

What kind of fuel mix do the 2stroke engines on those container vessels use?

Premix or injected? Sorry if you answered this in another thread, I must have

missed it.

[J.J.]

Wow!  Have fun dude.  That should be interesting  .

What kind of fuel mix do the 2stroke engines on those container vessels use?

Premix or injected?  Sorry if you answered this in another thread, I must have

missed it.

Don't get me started on ship's engines, I find it hard to stop rambling once I start

 

Since you asked, there are 2 systems of oil lubrication in these large 2-strokes.

 

First you have to understand that these engines use a crosshead between the connecting rod and the piston rod. The piston rod is rigidly bolted to the piston and is basically a round section rod, slightly longer than the stroke. The other end of the piston rod is bolted to a crosshead arrangement, this is a pin that runs in the top bearing of the connecting rod and is guided by slippers to be able to move vertically only.

If you take a look at the gif in my sig, you might get what I'm trying to say.

 

The crosshead has 3 obvious functions;

1) The side loads normally experienced on piston skirts are negated by the crosshead slippers which slide up and down in the engine frame. This yields very low cylinder liner wear as you can imagine.

 

2)The 2nd function is that because the piston rod is moving vertically only, it is quite easy to seal the under piston space from the crankcase by a stuffing box (type of a gland).

Since the huge volume of the crankcase is now sealed from the scavenge air (boost air from the turbos), we have now effectively stuffed the cases.

 

3) The 3rd function is that because the under piston space is sealed from the crankcase, the products of combustion do not pollute the crankcase oil, and oil consumption is very low. So on the engines I'm working on, the crankcase will have about 40 000 litres with the dipstick at full... This is run of the mill engine oil.

 

Now you might ask what lubricates the piston rings and liner...

A totally different oil is injected into the cylinder at various radial positions, slightly below the position of the lowest ring at TDC. The injection of this oil is computer controlled and will automatically be compensated for various load conditions. The injection parameters can also be varied to compensate for fuel with a high sulphur content, or for running in of new piston and rings for example.

This oil goes up in smoke at the rate of about 1200 to 1500 litres per day depending on sea conditions and power output.

 

As for the little trip to China, (short hop from where I am now), I feel like a 4year old going to Disneyland

[rebelbanshee2]

F1 is sweet...way better than redneck circle racing