Propane injection

[Rawze]

(10-13-2016 )Kevin7898 Wrote:  Propane to a diesel is like nitrous to a gas engine. Except better. As stated it hepls burn the fuel more completely, but it also significantly lowers your egt. So thus allowing you to dump more fuel and air in and get a safe burn. Works even better with ecm controlled motors when they are tuned and have the internals to match.

I prefer to base what I learn on science and not a bunch of market hype. What you state there makes me think of all that XM radio market bullshit from some company that has brainwashed everyone in their path.

Here is some info that is more along the science of it all ...
http://www.sciencedirect.com/science/art...6815000162

I.E. in their study, it shows clearly that Propane and/or LPG alters final crank angles dramatically, just like I suspected, and requires the engine to have much different operating requirements. Therefore for any modern diesel engine that has to maintain precise control of the combustion process to be efficient, it is paramount that the ECM have special programming to compensate this at the very least. The problem is that there is very little research on getting that part correct, so I seriously doubt that any company that is selling those kits is even getting it close,.. nonetheless right.

Even in the document I referenced, they state that its only real advantage on a duel fuel application in the mid power band of the engine, but even these dumb-asses did not account for the lack of injection pressure differences in the injection cycle, and/or the change in spray-pattern of the diesel assist. -- Again,... too little research and lack of understanding overall. The more pre-combustion and cylinder pressures you have on the uptake because you have a volatile mix,.. the less difference in injection pressure when the diesel goes in,.. and guess what -- at some point high in the engine load requirement, you will start to get cylinder washing and excess cylinder pressures. This would REQUIRE that the compression ratio and FAM of the engine be altered as well,.. and those are some serious hardware changes such as different pistons and/or crank, etc. to really dial it in close enough for it to become a competitive advantage.

I see a shortened engine life as compared to a well tuned engine, and as well, a fuel with LESS energy always requires larger quantities to make up the difference.

I still see no long term advantage, but only a big gaping hole of crap that companies can use to brainwash people out of their money, then go onto forums and brag about how good it is with no merit behind anything they said.

ALSO... there was a big project for the CM870's with this setup and special injectors .. it is called the "Westport" system and hence the multiple injection cycle settings found in the old CM870 programming. - At the end of the day, the gains were nowhere near what they claimed should have been, the operating costs were higher, and the emissions were not where they needed to be. this is even after using special programming in the ecm and direct injection of the propane.

Those claims by those companies of adding 50+ hp and 10+hp to "boost power" and gain fuel economy = a huge jump in internal engine friction and absorbed heat into the cylinders (causing egt's to fall off).. leading to a massive acceleration in engine wear, shortened engine life and high risks of liner fretting.

I.E.> its all marketed bull@#sit!