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Old February 15th, 2018, 19:13   #13
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Join Date: Jun 1998
Location: Sterling, Massachusetts. USA
Fuel Economy: 116 mpg(e), 36 mpg gas, 100 mpg combined
Default Po-tay-to / Po-tah-to

I don't have a CR, and one reason is a personal nervousness about using B99 / B100 in a CR, specifically because of the emission controls needed to (almost) manage the issues with petroleum diesel. Those petrodiesel emission treatments prevent the use of high bio blends.
Petrodiesel has a higher volatility than biodiesel. It vaporizes much more easily making it more flammable and prone to evaporation.
The oil level increase is due to the use of the injectors to add another shot of fuel long after any compression ignition could occur. This raw fuel (petro, or bio) stays liquid and gets on the cylinder walls when the piston is down and about to start up on the exhaust stroke. The raw fuel droplets that have not made contact go out the exhaust valve and turbo into the cat where the latent heat causes the fuel to ignite there. Without dirty petro diesel that needs the after burn, there is no need for the after burn.
So, yeah, the chosen emission controls needed for dirtier petro make it unsuited for cleaner bio.
Petrodiesel also has water issues, but the immiscibility means that the slug of water gets in at once when a quantity is reached, rather than being consumed before a concentration level is reached.
How's that for putting a spin on a counterpoint?
If the quantity of carbonic acid increases in geometric progression,
the augmentation of the temperature will increase nearly in arithmetic progression.

Svante Arrhenius 1896

Cogito ergo soy (I think, therefore: Biodiesel)
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