smoke_pedal

Well, that'd be one way to get a 3rd gen to knock. Diesel injected into the chamber ignites almost instantly. this is because the heat of compression, and the extreme pressure in the cylinder promote the chemical reaction. At the point that the diesel is being injected, the cylinder pressure, and temperature are sufficient to ignite it. By the same merit, it is safe to say that the auto ignition point of diesel is reached well before the piston reaches top dead center. if there is diesel in your cylinder before it is supposed to be, it will explode, causing a horrible knock, tremendous mechanical strain on your crankshaft, pistons, connecting rods, cylinder head, and head gasket, and pretty much anything else that is important, or expensive in your engine. A diesel runs with a compression ratio of 14.5: to 21:1. Some are slightly higher even. Most of our 5.9s are in the 17:1 range. A gas engine with 8.5:1 cr will destroy itself with pre-detonation if you put diesel in the tank. It happened to my dad the day I was born. he only had about 10 miles to drive. imagine the violent pre-detonation you would see in a 17:1 CR engine. Propane or water/methanol would be the correct choice for what you want to do. you'd be better off trying to inject airplane gas than diesel. (airplane gas would still pre-detonate) There are some companies that make w/m injection systems that are far cheaper than snow or the other top dogs. I have soleniod valves hooked up to a tank pressurized by my onboard air system. they give me w/m in two stages based on boost. they come on at 15 and 25 psi.

04ctd

would not 100 psi be enough to flow backwards out the intake system due volume & PSI?

XLR8R

That's true - #2 diesel ranges from 15-25 octane!