Pivotal engine

[Madmax]

some good ones

[Madmax]

some more for you all

[ducatilover]

Many of these wonderful new designs are great ideas, but. The stress of combustion may well overcome the stranger ones sooner than our normal configuration. I can see many a balancing problems, un necessary reciprocating mass, and major wear about to happen. But, they are really choice ideas. I'm not saying one or more of them may better the general layout we are using, but, you never know. People have managed great things with the Wankel engine.

That first example did seem to scavenge alot, as far as I have been taught scavenging through "valve" overlap [not the exact case here] can increase intake velocity. Increased intake velocity can mean more potential combustion and a higher amount of cooling to the intake valve, letting a sharper camshaft face to be used to allow for more duration, smaller lobe centers and more power and hirgher rpms. Ofcourse like everything in an engine there is a compromise.


But, I may be wrong, feel free to correct me

[bogan]

theres certainly a lot of alternative designs out there, but as they all work on the same basic principal, it wouldnt surprise me if they all had very similar power outputs, life-cycles, and efficicncys compared with traditional engines. Some designs may performa and wear like a rotary, some inefficient and powerful as a two stroke, some effecient like one of those fancy deisle.

The real engine improvements are in ceramic coatings and that sorta guff, if they can get those to work good as you cud run an engine with no radiator, and no oil, vastly increaing the temperature, and efficiency, preolly nead direct injection for it though.

Or just go electric, a guy did a 40hp 140kg Apprilia RS125 conversion, does 80mph, and goes 40miles between charges. So its basicaly like my VT250, but better acceleration, and lower range.

[Madmax]

seems a bit ahead of its time


Bore 4.25 in
Stroke 5.5 in
Displacement 1404 in3 (23,007 cc)
Output 425 HP at 2000rpm
Weight 749 lb
Diameter 20in

[Madmax]

Many of these wonderful new designs are great ideas, but. The stress of combustion may well overcome the stranger ones sooner than our normal configuration. I can see many a balancing problems, un necessary reciprocating mass, and major wear about to happen. But, they are really choice ideas. I'm not saying one or more of them may better the general layout we are using, but, you never know. People have managed great things with the Wankel engine.

That first example did seem to scavenge alot, as far as I have been taught scavenging through "valve" overlap [not the exact case here] can increase intake velocity. Increased intake velocity can mean more potential combustion and a higher amount of cooling to the intake valve, letting a sharper camshaft face to be used to allow for more duration, smaller lobe centers and more power and hirgher rpms. Ofcourse like everything in an engine there is a compromise.


But, I may be wrong, feel free to correct me

these are all about 1930 or before there is not much
that has not been done before

[ducatilover]

these are all about 1930 or before there is not much
that has not been done before

Too right, engine design is all about compromise. Which is why valve timing, lift and duration systems were made. The same reason ignition advance/retard was made. The same reason we buy the wife what she wants [but buy it cheap, no car, no head]

[Pedrostt500]

Try this one,
http://www.bourke-engine.com/
There is some interesting history to this one.

[Pedrostt500]

I would acyualy like to see a Bourke engine in the flesh, keep in mind he desighned this engine in the 1930s, back then to get 20,000 rpm from a piston engine was un heard of, he could not get higher RPM due to no ignition system of the era was capble.
There was a story that I read years ago that said they were testing the engine in a Ford V8, they were driving at 40mph when Russel Bourke told his test driver to suddenly floor the accelorator to see what would happen, apparently the gear box decided to let go.

[ducatilover]

They are unbelievable, especially when you consider the era.
Reminding me of ahead of time, many BRM engines were amazing but suffered from ignition problems.

[Madmax]

forgot one

[ducatilover]

Now, that, is an interesting idea!

[Madmax]

one more for the interested