It is my understanding that you lose smoke due to a better burn because pain combines with the oxygen that the diesel doesn't...I don't believe many of the claims that are being made about LPG fumigation.
For example, on MrSharky's site, he mentions that typically only 75% of diesel fuel is burned without fumigation and 85-90% with.
If that were in anyway true, you'd be blowing massive amounts of black smoke, everywhere.
The claim that fuel economy will improve. The only reason fuel economy can improve is if you don't count the energy from the propane that you're burning. Replacing diesel with LPG is false economy as diesel is cheaper per kJ (or BTU if you prefer).
The main thing to remember is every bit of propane you run into your engine displaces oxygen. So you're not only adding more fuel, you're reducing the amount of oxygen available to burn your diesel.
Keep an eye on your EGT and exhaust condition. You could simply be reducing large particles of soot, into smaller almost invisible particles of soot.
If you're smoking, then there isn't a lot of air left.It is my understanding that you lose smoke due to a better burn because pain combines with the oxygen that the diesel doesn't...
Well lets see.I had toyed with the ides of adding it to my 6bt but Charles has scared me off it.
I was under the impression that propane needed 500c to ignite and that compression in a diesel engine only gets to about 400c so untill the diesel is injected there is no pre ignition, I appreciate that the flame propogation with propane will be quicker and thats what in effect advances the ignition some. I know the dodge guys advance there timing a bit and then adding propane advances it some more but how much more? If they hadn't advancd it would adding propane at a lets say 15% be OK? . Sounds like the gains are outweighed by the risks.
This is why I specifically stated that I was going to implement a propane fumigation system for my truck, and not a propane injection system. All I want is the small amount of power and the accompanying fuel mileage increase that misting a very small amount of propane as an accelerant can provide. To sum up this point; yes, I am one of those 1% of people that can resist cranking it up in the quest for more power.It can be an economy tool. And it can also outweigh the cost of the additional fuel through increases in combustion efficiency (effective timing, flame front propogation and cylinder pressure).
I have read a few of your other posts and knew you were a Powerstroke guy, so I was going to offer a comparison of bamboo sticks to 4"x4" fence posts as an analogy comparing the strength of our bottom ends, but I see that you already have a handle on that.Another important aspect is that y'all are running B-series Cummins engines, and I'm running a 7.3 powerstroke. Y'all can get away with much more than me. The bottom ends of these respective engines is far from an even playing field.
Bruce, you mention going down hill real slow. Keep in mind that diesel engines offer no engine braking like a gas engine does. That is the reason Diesels run different types of engine brakes to keep control of the vehicle on downhills. Thus even with the low range of daul T Cases, the engine is not holding you back. There is a good presentation at the link below;That and i am trying to access some real tough areas . I do not worry about going up the darn hill , I want to go down real slow .
I want bead locks too and the ability to air down to 2 to 5 lbs .
I am not sure how the bead locks would handle the queen sized water bed . But with on board propane i could keep the fridge running nice and cool .
After doing alot of math i went for the 4.88 gears . In 5th I will be running at 60 and change and the engine will be dead center in the happy zone .
I disagree on that, I've found diesels offer a lot more engine braking than a comparable size petrol engine.Bruce, you mention going down hill real slow. Keep in mind that diesel engines offer no engine braking like a gas engine does. That is the reason Diesels run different types of engine brakes to keep control of the vehicle on downhills. Thus even with the low range of daul T Cases, the engine is not holding you back. There is a good presentation at the link below;