the clean two-stroke thread

[WilDun]

.................................................. ...........
I'm sure one could argue that Diesel & HCCI are just different types of compression ignition engines.

Yes but (as I see it) with a couple of subtle differences, ..... Direct injection and particulate matter production! ..... in the diesel!

[Pursang]

Yes but (as I see it) with a couple of subtle differences, ..... Direct injection and particulate matter production! ..... in the diesel!

DME
Dimethyl ether, DME, is a synthetic, gaseous, diesel fuel that results in clean combustion with very little soot and reduced NOx emissions.

Recognized as a second generation Bio Fuel, it can be synthesized from any sort of crap (especially from Crap!)

Can be substituted for propane, in LPG. And, with slight modifications, diesel engines run well & cleanly on DME. It is also a refrigerant (the 1st, back in 1876) and is used in wart 'freeze spray)

At the 2009 European Shell Eco Marathon, an unofficial World Championship for mileage, a vehicle running on 100% dimethyl ether drove 589 km/liter (169.8 cm3 /100 km), fuel equivalent to gasoline with a 50 cm3 displacement 2-stroke engine.

Thanks to Wikipedia for the info: https://en.wikipedia.org/wiki/Dimeth...r#cite_note-23

And it has a cool looking molecule:

[WilDun]

DME
Dimethyl ether, DME, is a synthetic, gaseous, diesel fuel that results in clean combustion with very little soot and reduced NOx emissions.

Not sure of course, but I think the other difference between diesel operation and HCCI might be a determining factor as well, ie direct injection which I feel, isn't compatible with HCCI.

[Pursang]

Not sure of course, but I think the other difference between diesel operation and HCCI might be a determining factor as well, ie direct injection which I feel, isn't compatible with HCCI.

Also, the Diesel process runs un-throttled (Power follows Fuel, not air flow) & psuedo stratified, at the injection zone.
HCCI, by its very definition, requires a homogeneous charge.

DME might be the appropriate fuel for Neil's new OP engine, particularly if E85 is no longer an option.
Double up on the Green Credit points (a marketing bonus).

Cheers, Daryl.

[katinas]

TS3 Horizontally Opposed Piston Engine
Rootes Motor Group built an engine for their trucks which was a design loosely based around an original Sulzer Brothers concept,



but why stop there.

Read that one bus driver prefer later type with four stroke, because of much quieter engine.

[WilDun]

Read that one bus driver prefer later type with four stroke, because of much quieter engine.

I remember Neil (Flettner) saying that most of the noise came from the roots type blower - perhaps a turbo instead? which might fit in well with a lack of expansion chamber? - the 3 cylinder layout might be good (interconnected exhaust).
Looks like there will be a lot of jet fuel available in the future too - could that be vapourised (injected?) somewhere else? rather than at the top of the stroke by high pressure injection? (a homogenous mixture is required for petrol/HCCI of course)

So, what I'm asking - is it possible to have diesel operation with Jet Fuel using a fully homogenised (probably heated) charge but without the need for late high pressure direct injection to initiate combustion?

[katinas]

Cummins and Kharkov two stroke Opposite piston engines for tanks
http://www.malyshevplant.com/en/content/6td/
https://www.nationaldefensemagazine....ed-powertrains
https://revivaler.com/vincent-two-st...feboat-engine/

[katinas]

Same, 5 cylinder 5ТДФ type Opposite Piston engine in both videos. Direct evolution of Junkers Jumbo 205.
Torque at exhaust side crank approx 70 %, intake side 30 %. Engine can work on diesel, kerosene and gasoline Ron 72, just needed to move the knob to another position.
Compression 20.9 (effective 16.5 )
Two piece piston, top made made from heat resistant material and bolt on to the main alloy piston. Idex in scheme 22,
https://www.youtube.com/watch?v=_CGLanOPwnw
https://www.youtube.com/watch?v=gJwnV6MmNbQ

[ceci]

How about some simplicity

https://patents.google.com/patent/US...10%2c487%2c777

[ceci]

How about some simplicity

https://patents.google.com/patent/US...10%2c487%2c777

The two patents are current and effective 2035.
In both I see similarities with Katinas work:
The first patent the crankcase is also fed through the transfer windows (30a-32a).
The second patent has a reed valve controlling the transfer (24b)


https://patents.google.com/patent/US9726070B2/en

[WilDun]

Same, 5 cylinder 5ТДФ type Opposite Piston engine in both videos. Direct evolution of Junkers Jumbo 205.............................................

Well, - like I said about OP, pollution problems over!! - but let's be positive, if everyone has one, then it won't be noticed!

[Pursang]

.
Makes a Hell of a mess if you blow one up, too!....
.

[ceci]

I am in doubt as to whether these statements in this patent are true or fake.
If true, why has it not been worked on evolving it?


https://patents.google.com/patent/US...=4%2c627%2c390

[ceci]

[Flettner]

What are we looking at CECI?
A little more information please.