if i run straight diesel v.s. Diesel with a gallon of oil in it which has a higher cectane level

 

since cetane rating is how readily the fuel ignites, i suspect the straight diesel would be better in that regard. but i'm no scientist when it comes to this.
i've run as much as 20% oil in my diesel with good results, i would say you're totally fine running even a few gallons oil per tank of fuel, though i can't say what it does to the cetane rating. but if it runs well on it, what does it matter

 

I try to burn B100, from Houston BioDiesel whenever I can, and have since Y2K or thereabouts; I'll never forget just how much the 12V BTA 5.9 smoothed out when the petrodiesel segued to the Bdiesel at the combustion chambers; night and day difference!

I asked HBD's owner (and pump jockey/cashier/warehouseman/buyer/salesman/class instructor/etc., you get the picture) about this phenomenon, and FWIW, he told me Bdiesel has not only higher lubricity values, but B100 has a cetane rating around 65+-, whereas USA-spec petroleum diesel runs 54 (the lowest in the world, BTW). Perhaps exaggerated slightly (c'mon--11 points?), but considering the improvement in engine performance I saw, I have no real reason to doubt him.

Eddie, The

 

Diesel is a distillate and is measured in cetane. WMO is a residual and cannot be measured in cetane levels, but should be measured CCAI or CII, in IMO. In reading, the calculation will normally give a value somewhere between 800 and 880. The lower the value is the better the ignition quality. Fuels with a CCAI higher than 880 are often problematic or even unusable in a diesel engine. CCAI are often calculated under testing of marine fuel.

So I think the question people should be asking is what is the CCAI of WMO?
So, does anyone have a number?

Note, all info above was from Wiki searching cetane.

Ben

 

On my usually traveled route which includes NY, PA, OH, NC, WV, and VA, I have seen several diesel pumps with stickers indicating their diesel cetane rating is 40-45. I think the minimum must be 40 since I've never seen it lower than that. I would love it if the min spec was 54, the highest I've seen is 50 on a few premium diesel pumps.

As far as us being the lowest in the world, I lived in eastern Africa for 2 years and can undoubtedly tell you that their diesel isn't nearly as good as ours. I don't have any hard numbers but I know of several fuel stations that in no way, shape, or form, had a higher cetane rating than what we have in the US.

 

One thing to remember about cetane is every engine requires a different amount, and every engine has a sweet spot. It is possible to put in to much cetane and get a net loss of power. The cetane flashes off to soon in the injection cycle resulting in less power due to the advanced timing.

Diesel Rod

 

5 gallon's 0-20 moter oil, and 5 gallons diesel, 1/2 gallon rug, no differance in how she runs or starts, my oil is virgin,,I get it from work, some atf in the mix as well,, i try to get the light 0-20 oils...