Quest. Why is there an intercooler between the compressor and expander?

     Answer:  Because the engine will have a higher compression rate than comparable engines, the higher compression heat has to be abducted. Otherwise the combustion heat will be too high, which in turn create environmental pollution.

     Q.  It is not possible to see on theese pages a devise for fuel delivery and ignition. How will that be solved?

     A.  That is easy. A carburator or injector is to be connected in front of the hollow-centered rotor shaft with a gasket ring in the passage between the shaft and a fixed pipe to the carburator. An igniton devise (spark plug) is placed on the rotor housing and is following its rotating. At a certain position the plug is passing a contact from a devise beside the engine and receive a spark to the plug.    

     Q.  What about the combustion room?  Does it have a good shape for a complete combustion? It seems to be too narrow and making the flame not to reach every corner or perhaps puts it out.

       A.  A traditional engine has a cylindrical or spherical combustion room, which is better. But the Aucon engine can easily be compensated  with more sparkplugs. Besides the fresh gas is forced into the combustion room with a high pressure and turbulence, which gives a fast flame progress. It is also to be expected that the fuel-air mixture has time to completely vaporize during its way through the channels and the intercooler before the ignition, which is important for a complete combustion.

    Q:  Don´t you loose energy during the combustion and expansion in the Aucon engine? In an ordinary piston engine the pressure has time to be built up at the top dead center and give more power to the piston?

    A : No, the energy is better utilized in the Aucon engine because of a more extended combustion process (See diagram). You get a lower peak pressure, but a extended higher mean pressure. The design with two separate units (compressor and expander) makes it possible to have a bigger expander than the compressor to utilize maximun of the energi, unlike the ordinary piston engine, where much of the energy is wasted in the exhaust stroke. May be you get a bigger friction loss, but probably that can be neglected as the Aucon engine has extremely low friction because of its rotating housing. It is also true that in a traditional piston engine the pressure has to be built up as fast as possible at Top Center, but then a lot of energy is lost through surrounding walls in the cylinder. The higher pressure and temperature the bigger the lost. That is easy to experience at a hand start of a chain saw or lawnmower. It is more easy to turn the engine round with the ignition plug removed. It depends on much of the compression heat is lost through the cylinder walls. Otherwise the compression pressure is fully effected on the piston returning from TC and give the same power back.

    Q: Don´t you loose more heat energy through the surrounding walls at an extended expansion stroke?

    A:  It depends on the rotation speed and the combustion speed. The Aucon engine has a wider speed range and is more efficient at a higher speed than a  traditionel engine.

    Q: In a traditionel piston engine  the incoming gases have a cooling impact of the engine. Isn´t it a risk for overheating of the expander as the Aucon engine doesn´t have that feature?

    A:  No, the Aucon engine is cooled by an extended expansion stroke in order to utilize all the energy. Besides that  the invention has a unik internal cooling design. The cooling air goes through holes in the side plates of the housing into the center of the rotating piston and out via holes in the vane. See picture.

    Q:    Isn´t it fuel cells with hydrogen and el-drive that is the future?

    A:   Hydrogen is on way to become the energy bearer of the future.  BMW and  Ford  invest huge sums in hydrogen combustion engines. Fuel cells engines have at present too many problems to solve before they can be competetive. I think the Aucon engine, after development, will have a good chanse to compete in the effords for a better environment. See the patent application. See also report nr 122 in Swedish Gas Centre (page 4 in english)

   Q:   The engine reminds on the Brayton engine, which has not so good efficiency. What makes the Aucon engine better?

   A:   The Brayton engine has a combustion chamber between the units compressor and expander. In the Aucon engine the combustion starts and completes in the expander. The power then direct presses the vane for a rotating movement without a loss of energy.

   Q:  The Wankel engine has had big problems the the sealings. Has the Aucon engine the same problem?

   A:  No. Its unic design with the vane fixed to the housing elimintates the apex seal as in the Wankel engine.

   Q:  Is it possible to use heavier fuel as diesel or vegetable oils?

   A:  Yes, because the fuel mixture has a good time to vaporize during its way to the expander.

   Q:   When the vane is fixed to the housing how can it rotate?

   A:  It rotates together with the housing and gives the following advantages.

1. Sealing of the vane is not necessary.
2. It is easy to cool the vane when it is exposed to high power and heat.
3. There is no "drawer effect" between the vane and its recess in the rotor.
4. As the rotor is not burdened with any torque there is an extremly low friction in the mentioned recess.

   Q:  How is the variable combustion chamber working?

   A:  The rotor has an intake valve with an adjustable lifter, which makes the valve open and close by outer influence. The vane can then move shorter or longer way from the contact line between the rotor and housing and consequently the combustion chamber changes. This quality is favourable at part load as it is then possible to increase the compression rate and get better efficiency.