Here is some info: I’ve saved more through the years, I just have to find it.
The Impact of Generator Set Underloading (Must be logged in to view the attachment)
Some other stuff
https://service.multiquip.com/pdfs/Diesel_Engine_Wet_Stacking_Prevention.pdf
https://res.mdpi.com/d_attachment/eng/eng-01-00009/article_deploy/eng-01-00009.pdf
Sorry, this is long winded;
I read both of the PDF's. I know the trucks that idle for hours at truck stops have trouble with wet stacking in cold climates.
This got me thinking about some high temperature wood stoves I have made. I built one last winter with a ceramic fiber burn box and 2 blowers. Out put was very clean. Almost zero carbon build up in the stove. Flue exhaust (2 inch PVC) is basically warm misty CO2. Pretty cool for a wood stove.
I design my wood stoves with these principles; You have your fire triangle - fuel/heat/oxidizer (O2) but I also came up with an efficiency triangle after studying thermal oxidizers - time(under heat)/turbulence/temperature. Burning fuel is pretty simple, break the fuel down to its individual atoms and combine it with and oxidizer and allow enough time. Problem is, there is not enough time in a wood stove so we an make up for it by increasing the heat. In an engine, there is pretty much zero time so its pretty much just heat and mixing(turbulence). You can actually burn a fuel at room temperature by the way. Just allow enough time and it will oxidize(burn).
So in your diesel, as long as you have enough heat, air is coming in, and your injector is spraying fuel, it should run. Problem mentioned in the articles is that there is not enough heat in low load operation and the fuel is not burning completely. Just like if you run your wood stove on low you get build up in the chimeny.
partially broken down fuels(incomplete combustion) produce smaller hydrocarbons like tars/turpins and such and when they condense and combine with carbon it forms a sticky mess. Enough of this can cause engine damage over time.
with diesels unrestricted air intake, the fuel mixture can become extremely lean under light fueling adding to the problem. The cold high volumes of air cools the fuel mix to much causing pockets of unburned fuel.
So basically, motors are designed to operate in a window but, can we move the window around. How low can that window go? They use to run motors at very low RPM years ago, I'm assuming they worked fine???
We just need to maintain the efficiency triangle at the RPM's we want to run at. Listers seem to already have issues with buildup so how do we keep efficiency up? Trap more heat in??? Up the static compression??
I mentioned wrapping the block and head in insulation earlier, Anyone have any thoughts on that?
? What issues would this cause??
Great input so far!!