How does the multifuel engine actually work?

I've been too busy/lazy until now to bother looking into it, but I'm curious. How does these multifuel engines actually work? Why are these engines able to run on all these different fuels?

Extremely high compression (~27:1) and extra attention paid to the fuel atomization/spray pattern help to burn different fuels. There is also a fuel density compensator to help with the air/fuel ratio. There is probably also some secret magic voodoo mixed in somewhere.

In a nutshell: The injector squirts a stream of fuel into a cup in the top of the piston. As it evaporates from the cup, it burns and expands, pushing the piston down. Conventional diesels inject a mist into the cylinder that burns immediately. The evaporation lag is what allows the engine to burn "hot" fuels such as gasoline, without detonation, or the fuel exploding rather than burning. M.A.N., a German company, invented this engine design. Continental called it "Hypercycle".

really its 22-1 comp.

And they are still mult-fuel even with the fuel density compensator bypassed!! Its mostly in the way the piston/combustion chamber is designed.

Do a search for the word "hypercycle"-all your questions shall find answers.

.....or read here: https://www.steelsoldiers.com/showthread.php?30821-all-dueces-multifuel.html, post #10: David Doyle's description of the MF combustion system...... and what others had to say about (or against) it.....



(BTW I kinda miss him Rolling......... )


G.

jesusgatos said:

I've been too busy/lazy until now to bother looking into it, but I'm curious. How does these multifuel engines actually work? Why are these engines able to run on all these different fuels?

Click to expand...

In goes the good air out goes the BAD.

So, my old Ford with a 7.3 indirect injected Diesel, 22 to 1 compression, seems to meet those simple specs. Is it therefore a multi-fuel? There has to be more to it. yeah, I know, search, which I shall......

Nope, missing a swirl combustion setup, it's an IDI setup as well.

tennmogger said:

So, my old Ford with a 7.3 indirect injected Diesel, 22 to 1 compression, seems to meet those simple specs. Is it therefore a multi-fuel? There has to be more to it. yeah, I know, search, which I shall......

Click to expand...

Your IDI can handle thinker fuels like WMO, but not thin fuels like gas. Put gas in that engine and your going to need a new one.

After all these years the new cars use it now, albeit much more sophisticated,
but same same GI.
Would you like to see the patent?
One notices that there is no diesel clanking and banging and nasty noises,
just sweet power from almost anything that will burn.
"Tiss a proper diesel engine.

And I would believe almost anything David Doyle would write but all links broke.