Ok. I could be beating a horse but here it goes.

Why can't you set up secondary constant flow injectors for high HP applications.

This is my theory on why it will work. Btw these might not be good examples:

If you have ever seen a diesel runaway video when a turbo seal fails and it's feeding oil into the intake. It runs "fine".

We were working on my friends idi and without thinking he dumped half a bottle of seafoam in the intake, and it ran away...up to about 4k+ rpm....



But my biggest argument involves the Pre-chambers.

I have noticed if you load the engine up and immediately let off the engine still will occasionally rev up. The only thing I can think that is happing is fuel is pooled in the prechambers and sucked in the next couple revolutions.

So why can't you run secondary injectors for WOT applications....

You don't have to inject propain at a specific time to gain power, why not the same for vaporized diesel

 

working off a hobbs switch? I thought the idea of propane is to speed up the flame front to more completely burn the diesel fuel. Methanol/water to do the same thing as well as cool the intake charge.

 

Right but the DB2 pump can only flow so much fuel.

I guess the question is, is why can't you inject vaporized diesel into the intake. These engines arnt direct injected so why would injection timing create such an issue. Especially with constant injection at wide open throttle, more fuel, more air, more power

 

To go a step further, there is a bloke over here working on gas engines who is working on vapourising the fuel in a preheated chamber to increase mileage by about double.
could something similar be done with diesel? Just sayin'

 

Randomly appling diesel fuel in any form into the intake will not work properly. If you think about how a diesel engine works, fuel is injected at a precise timing to run properly. If you introduce diesel into the intake it will ignite from the heat and pressure at random timing events. This will fight the normal injection and could case serious damage to the engine.

Any fuel source indroducted into the intake of a diesel engine must resist igniting till the diesel fuel is injected into the engine.

 

right it would be smiler to gas engine knock detonation.
if you were running high enough rpm, you might be able to, but once you start adding boost, the compression goes up and it will light off farther and farther btdc.

and you can't just run away from it with rpm, the faster you compress air the hotter it gets.

 

Another thing to remember to when comparing propane with this concept is at what pressure diesel will combust compared to propane. I'm not sure which one would combust earlier. I do think that there would be more benefit in just adding more fuel with a bigger IP though. You never know until you try though...

 

Propane is drastically more combustible than diesel, so vapourized diesel cannot be applied the same way. More importantly, diesel has a very low volatility, so keeping it in vapour form is difficult (hence why diesel injectors are monsters compared to gasoline injectors; 75psi Vs 10,000 to 40,000psi).

Cold vapourized diesel in a relatively cold intake will precipitate onto the intake itself and collect. Any remaining vapour would be susceptible to a slow burn during the compression stroke, pre-TDC (like a really slow knock) which will rob power rather than add power. Any small amount of badly-vapourized fuel that made it to injection would only add inconsistency to the flow in the swirl cup and contribute a small amount of additional fuel that could be better achieved by increasing fuel delivery on the pump.

Propane doesn't have any of these issues; it's a gas at very low temperatures, does not precipitate into liquid, and by the nature of gases it tends to disperse evenly in a space (i.e. it will mix well in the cylinder on it's own, no swirl required). The issue it does have is it is very much more easily ignited than diesel, so it could easily ignite prematurely.

I haven't heard of the reference to the heated chamber for vaporized gasoline, but it would have to be outside the cylinder (no spark or compression applied) to prevent knocking, unlike our pre-chambers which are inside the cylinder.

I think one way to get more fuel than the pump will deliver (assuming that's what we're talking about) other than replacing the pump might be to inject something via the GP hole... you'd have to do it as to not ruin the swirl effect in the cylinder though as that could reduce power. And of course, you'd have to deliver enough air for that to happen... without blowing the head gasket... and you'd have to start it with ether since you removed the GPs.

78% of that normal intake air is inert... try oxygen injection?

 

Oxygen injection....never thought of that.

I work as a iron worker so I have access to o2 bottles....

I'm half tempted to try it

 

why not just use a nos system at that?
still you need more fuel

and eventually you will cause enough pressure to blow the heads off just as using a turbo.

a good turbo is the only was to go for a dd

 

That's it... really you won't accomplish anything different than you would with a turbo, as long as you're delivering the fuel, which both have that limit.

"High HP Applications" is a bit of a misnomer for the IDIs...

 

How about a second IP, "Y" the lines from each IP to each injector. That would double the volume.

 

when adding propane..it is not enuff to make the engine run,,,it just makes it burn the charge more completly,,=more heat = morepower,,,power adders will reduce life of engine...just how much is debateable...a BIG turbo needs heat to work....so you must add fuel..increase pop preasure helps get it in,,in a shorter time frame,,,

 

I agree, this would be the easiest way, except that it turns out to be more expensive than the other options... Unless you really have some skills under your belt. That being the case, You don't think about such things, you just do them...

 

Stacked ip's, that would look mean, but around the same difficulty as a p-pump with the new housing and lines and everything