Hello,


I have never really investigated propane a s a performance option, so I know little about how it works. I understand you want vapor and not liquid, but that is about the extent of what I know.


My question is, does the propane flow into your engine constantly or only when the injectors fire?

It constantly flows when it is allowed. It is activated on a pressure system. It will only flow when there is enough pressure to open a passage for it to flow through. Some are variable, some are not. The PowerShot 2000 is a variable. This is what you want. You can also control the amout of flow on it. It is hooked up to the waste gate of the turbo or the intake tube, and when a certain pressure is reached in the manifold, it will open the propane passage. Edited by: Super Diesel

So if there is a combustable fuel being fed into the engine with the air, what controls when it starts to ignite?

Heat and pressure. This is why you need to be carful with it.

ITS PRETTY HIGH-TECH BRONCO I WOULD STAY WITH SOMETHING SIMPLE LIKE THE SIXGUNhttp://www.dieselplace.com/forum/smileys/HiHi.gif

So if there is a combustable fuel being fed into the engine with the air, what controls when it starts to ignite?








The point is to keep it too lean to combust prior to the diesel injection event. This is made easier by propane's high octane (resistance to auto-ignition).

from the perspective of trying to learn, does propane have a higher octane than diesel (if this is the way to ask that??) I thought i'd heard things about propane lighting off earlier than diesel which is like over-advancing the timing.

Propane by itself will not ignite in a diesel engine. It takes more heat to ignite then the compression cycle can make. The propane will only burn after the diesel is injected to start the combustion. diesel has very low octane but is higer in cetane.

ITS PRETTY HIGH-TECH BRONCO I WOULD STAY WITH SOMETHING SIMPLE LIKE THE SIXGUNhttp://www.dieselplace.com/forum/smileys/HiHi.gif


PEANUT MAYBE YOU SHOULD STOP HUFFING SO MUCH PROPANE http://www.dieselplace.com/forum/smileys/HiHi.gif

I've read that propane used in conjunction with big HP tuners achieves less HP gain than propane alone. Also that you cannot inject as much because of detonation issues if using a tuner that uses a lot of timing advance. I think I remember someone saying you get about 50hp additional gain on top of a high HP tuner vs. close to 100hp gain with propane alone on a stock engine.


From your sig it looks like you may have only intake and exhaust mods, which combine great with propane alone.


DougEdited by: DMax_Doug

Propane is about 110 octane( IIRC). It is an extra fuel. So if you are already having a hard time burning all the fuel you have from a big program, you will gain alot less with adding an additional fuel than with adding it when you can use more fuel. Simply, you will gain more with it from a low fueded program than over a high fueled program. UNLESS you introduce N2O, or a bigger turbo that can burn the additional fuel.