Dear Mr Paul Lamar,

i've seen, that you are interested in ignition systems.

Perhaps the following SAE paper ist nice to read (unfortunately I do
not have this paper ...): No 2015-01-0007 by Alberto Boretti et al,
dated 2015-03-10 - quite new ... :-)

Hoping, the little information will help you


Yours sincerely

Frank Herfert

(Germany)

Thanks for the tip.

Paul Lamar


An Abstract is here:

http://profiles.sae.org/79718499737/

Rolf Pfeiffer

This is running on hydrogen. Hydrogen will ignite over a wide range
of fuel air mixtures unlike gasoline. Therefore it is inapplicable to
the real world. Show me results with gasoline. The world is now
swimming in oil.

Paul Lamar


Not sure if hydrogen is that inapplicable, but that would be
off-topic. It seems to work with gasoline:
http://www.mahle-powertrain.com/en/mahle-powertrain/mahle-powertrain-projects/turbulent-jet-ignition/



Poul Woefle

Unfortunately that will not work with a rotary as it extends down
into the combustion chamber.

As soon as I get back from Oz Poul I will send you a system. I need a
dwg of the front of your e-shaft to make a new trigger disk.


Paul Lamar



A modified pre-cup that does not extend into the rotor housing to interfere with the apex seal could work. This is a modification of the older diesel engine pre-cup injection systems. Emissions concerns stopped their use. Case and Caterpillar are two I know of that used this. In the pre-cup enough fuel is injected to initiate a sustainable flame front which then comes out of the hole or holes into the main combustion chamber/cylinder pretty much as a plasma.

With modern fuel injection, multiple injections can be made per combustion event which can extend the duration of the ignition event. This plasma will start a much too lean mixture in the cylinder /combustion chamber than could normally be ignited. Stratified charge system. Could be promising combined Mazda's Sky activ technology.

Caterpillar had to have steel buttons in the piston crown to stop eroding a hole due to the aluminium getting soft from the heat. Some times the pistons had heat cracks radiating out from the button. Case used a different approach in that they fired the injector through a single hole across the combustion chamber into the pre-cup where it started the burn.Then the flame came roaring out into the main chamber not being aimed at the piston.


With a rotary engine with cast iron rotors this could work as the rotor would not be as prone to damage. Possibly TiAl rotors would work to assist in higher RPM capability.

Dale Davies



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