New type of engine?

[TheNeedForZ]

mtcookson,

I've read your reply. The compression and power stroke will cushion some of the inertial load, but the danger zone is in the exhaust stroke where there is pressure pushing the leading piston counter-clockwise, since the leading piston is decelerating, the inertial load is also counter-clockwise. The two loads overlap and gives the highest inertial load in ccw direciton. Ditto intake stroke, except in cw direction and less.

 

To put things into perspective, a stock SBC engine at 6500rpm has a peak inertial load of 3200G(that's G for gravity, not grams), or 7000lb given the mass of stock piston, pin, and small rod end. The bottom end has no problem with 7000lb of inertial load because the load is a stretching load, pulling everything up. Can one imagine pulling the rods with 7000lb of force and the rod not breaking? If the rod is strong enough like the stock rod, then I guess one can.

 

The problem with MYT is not that inertial load exists, but the fact the load is in the form of rocking load. Suppose the MYT inertial load is ONLY 10% of that, 700lbs. Can you imagine standing four 175lb guys on one piston and have it not failing? And that's just 700lb of static load. The real inertial load is rocking it sideways, happening with every stop and go, with the load growing rapidly as rpm increases. True, the MYT engine can be designed with a small bore and stroke(radius) so the pistons don't fall off, but then the engine will not have enough displacement or rpm to beat four-stroke engines.

 

The fuel combustion...there is never a lack of time to burn fuel, the reason some of the fuel doesn't burn is that it is not atomized well, not mixed with air well or just too cold/rich/lean to burn. The mixture that provides most power is a mixture with excess fuel anyway. The fuel droplet doesn't have time to go toward the outside....that is not quite accurate. The droplet itself doesn't really go anywhere, it's the pistons and chambers that swing. The pistons slap on the droplets, then the liquid is flung to the outside. If you slip a ring over a smooth stick, you'll see no matter how fast you swing, the ring can always find enough time to slide outwards. But that is not to say all the fuel will go to the outside, just some of it will be biased toward the outside. 4 stroke engines can have lousy fuel distribution too so it's not any better than MYT.

 

The main problem is inertial loads, all other problems can be fixed with small fixes. The inertial load is what is limiting the engine. Imagine the engine running at 200 times the speed in animation/video, then you'll begin to feel the inertial loads tearing the pistons off the base.

[BillZ260]

I'd say w/ out a working model to demonstrate any of these claims, its just a bunch of talk.

 

Interesting, but just talk.

 

Looking at that model they have it's going to require some fairly expensive production process to achieve that internal doughnut those pistons ride in...