I've been following the WMO and EGT thread and was wondering if EGT was a concern with B100, My guess is since BioD has less BTUs than Petro D the temps should be the same or lower. At present I've no way of monitoring my EGT. Does anybody got the data on this?
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Bio D and EGTs?
- Thread starter Drago
- Start date
I have seen lower EGT with B99 and less smoke. I have added more fuel via a tune and/or fuel screw and can smoke B99 just as well as #2. Same with EGT and more B99 fuel. 10% less MPG is normal without adjustments.
Biodiesel has other concerns like different cetane rating and evaporation being a lot less than #2. This means the fuel retards your timing slightly in reference to when the fuel ignites. This also means some of the B100 runs down the cylinder walls into your engine oil. Oil analysis doesn't report B100 in your oil as fuel dilution. Only a lower viscosity will let you know you have a lot of B100 in your oil. it doesn't evaporate like #2 will from your oil.
So even though B100 has less energy (lower EGT vs. #2) it's later lighting can raise EGT back up.
Biodiesel has other concerns like different cetane rating and evaporation being a lot less than #2. This means the fuel retards your timing slightly in reference to when the fuel ignites. This also means some of the B100 runs down the cylinder walls into your engine oil. Oil analysis doesn't report B100 in your oil as fuel dilution. Only a lower viscosity will let you know you have a lot of B100 in your oil. it doesn't evaporate like #2 will from your oil.
So even though B100 has less energy (lower EGT vs. #2) it's later lighting can raise EGT back up.
On a stock tune it isn't a concern. Again I have seen less smoke and lower EGT by switching fuel. Come to think of it my peak boost went down a little on B99. May (not likely) trip a boost code on the newer stuff like your truck.
Might be something to that, I'm not coding but my turbine is not the same "pitch"
If you are following your MPG closely you can experiment with B50 or other ratios. There is a point in theory where the MPG stays the same on Bwhatever vs #2 diesel. Cost for the fuels may make B100 cheap enough for the 10% MPG difference not to matter.
When you get paid by the mile fuel is 50% or more of your cost per mile (towing).
If you are going to do a lot of this keep track of the RPM your engine runs and how much power it takes. Then you can decide if you want to go NA or bigger turbo for more MPG. NA I would just get another truck...
When you get paid by the mile fuel is 50% or more of your cost per mile (towing).
If you are going to do a lot of this keep track of the RPM your engine runs and how much power it takes. Then you can decide if you want to go NA or bigger turbo for more MPG. NA I would just get another truck...
- Staff
- #8
I ran several tanks of B99 recently, and I did not notice much difference with EGT's. I do not have gauges yet either, but the regular gauges don't change at all from using #2 diesel from pumps. Mileage did not drop off that much either. I run a Hypertech #3 tune.
- Staff
- #10
That is still much better than $3.90 or so. :thumbsup:
The Duramax engine (2008 anyway) likes to run a high gear and lets things heat up. This heat causes the ignition delay to decrease in effect advancing the timing. Pulling my 28' trailer up a slight grade that wouldn't cause a downshift the ECT would move the numb gauge. During the pull in high gear you could hear a gas engine like ping. This ping was less loud with B99 vs. #2. (Same grade different day and fuel.) IMO GM didn't back the timing off when temps IAT and ECT rose. Also GM needed to downshift out of 6th more with ECT and load. Never put EGT on that truck, but, ran 1300 gal of B99 through it one year.
The only place I notice ECT differences is full fuel (WOT) long enough for the EGT gauge to stabilize with a load. Otherwise you are using 10% more fuel at less than full throttle to keep rolling the same speed and EGT will be close.