D-Cycle engine || IC Engine ||

D - CYCLE ENGINE BY VAN ENGINES

YAN Engines is a small technology company with offices both in Austin, Texas, and Brighton, UK. The company is focused on the development of its own proprietary high-efficiency engine concept that aims to provide significantly enhanced flexibility over the conventional four-stroke internal combustion engine architecture.

The differential stroke cycle piston (D-Cycle) concept relies on a split piston that completes the four engine strokes in a single crankshaft revolution, thus providing the opportunity to reduce the cyclic energy losses and improve combustion process efficiency

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[sailorondatea]

i see, gas displacement like a 4 stroke but large piston works like 2 stroke, ignition at every stroke. however it looks like intake volume is a bit reduced before compression. and small piston will have to move like twice faster than bigger one. at around 5K rpm for main piston it will be like 10K rpm for small one. it will wear down faster. maybe more suitable for lower rpm diesel engines. however, compression ratio looks less efficient.

[localenterprisebroadcastin]

To hell with resonance frequency and engine harmonics …we’ve got animations that prove it works 😂

[lpjunction]

Seems a good idea, a four stroke has half the time taking care of the exhaust gas.
Merge it in a two stroke cycle, it has the benefit of the two stroke with efficiency of the four stroke.

[oscarolander]

What pulls down the upper part och the piston, is it spring loaded?

[hackerish]

I can't really work out how it is in the original design just from the video, but it seems a better idea to have the upper piston start accelerating upwards for a short period of time after the intake until it gets up to speed and only then have it contact the lower piston when the lower one catches up.

That way there won't be much of a speed difference when the 2 pistons touch and it will be more of a kiss than a slap.

Then comes another question of whether to have the skinny rod do some compression without the support of the sturdy lower piston or just miss out on that small window of compression altogether.

[SekadarPendapat]

20% less fuel but 50%more space/weight/parts..

[yuanpingzhao]

Fast fluid discharging and charging in sequence to replace 2-stroke scavenge make huge 2-way pumping losses. I doubt the benefit and gain from the Atkinson Cycle involved will be wiped out. Not very worth doing. A smart engine design must yield the gains and benefits from all 4 individual strokes.

[awilde]

How does the intake work?
The secondary cylinder is free from the cam, so that can't put fore on the cylinder to suck in air

[glenntaylor]

Enough of the cartoons! Let's see a working engine!

[dgjm]

looks like a stupid design. im wondering how will it hold up from time. since theres more moving parts and im guessing after some time that have alot of clacking sound cause of the wear.