[2 strokes] V2 90 degree, common crankcase,one carb

Nombre de messages : 36 Localisation : Denmark Date d'inscription : 26/02/2013

Hello
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I am danish and my main claim to fame is having made worlds first and maybe last opposed piston engine with electric synchronisation of cranks.It ran first try.
Another idea that maybe is more usefull is to have a single crank with two conrods and pistons in one crankcase with one carburator.
A much better two stroke Ducati.
Balance is nearly perfect and output torque is very even.
If the Aprillia 250 had been made that way how much less power would that have given?
Simplicity,building volume and mass would have been better and this will compensate for less power.
I can read french and to some extent italian but will not be able to write it better than Google.
Is there a way describtion of how to put in photos ?

Kind regards

Welcome on board, Niels!

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Velkommen ! photos - [2 strokes] V2 90 degree, common crankcase,one carb 263463

Sujet: Photos from Denmark Sam 2 Mar 2013 - 19:53

I am learning slowly toupload photos
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Sujet: Crosshead Junkers Sam 2 Mar 2013 - 20:03

A concept for a two stroke domestic power and heat station[Vous devez être inscrit et connecté pour voir cette image]

Sujet: More of same Sam 2 Mar 2013 - 20:17

It is working .
I think future motorbikes will be synthetic petrol/electric and I plan to get very rich and famous by suplying all the generator sets.
No nuclear,fuel cells or fourstrokes,but real benzine breathing beast (and with a good efficiency.

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The crosshead junkerator picture sent a few minutes ago is really an animation but is probably to big .!.4 MB

On va suivre ce topic de pres !
photos - [2 strokes] V2 90 degree, common crankcase,one carb 771973

Sujet: V2 90 DEGREE ? COMMON CRANKCASE ? Dim 3 Mar 2013 - 11:05

YOUNG MEN ! lol!

photos - [2 strokes] V2 90 degree, common crankcase,one carb 998726

Just one question ... Where is the V2 ? And the common crankcase ?
Your motor is real and it s a good thing but it s only two motor assembly with a common head motor , no?
Can you explain the intake and the exhaust and why two differents pistons ?
I don t want be bad with you , it s only strange for me and i want to know how your motors turn like this !
Sorry for my bad english !!
And perhap s i am sleeping too !!! lol!

photos - [2 strokes] V2 90 degree, common crankcase,one carb 584741

photos - [2 strokes] V2 90 degree, common crankcase,one carb 412241

Sujet: V2 90 degree Dim 3 Mar 2013 - 13:28

Hello Marc and thank You for the animation

Hello Plinius
Junkers engines have one piston controlling inlet and one controlling exhaust.Different forms for different jobs.
To prove that the Junkerator concept, that is an AC generator on each crank ,can function the twin honda thing was tested.
My V2 interest came after reading about the Aprilia 125 story.Frits explains that crankcase pumping is only for starting.The real pumping work is done by the very short and sharp blowdown.
In that case all the funny crankcase combination for two cylinder two strokes from the last 100 years have been superfluous.
A rather late discovery.
Two stroke motorbikes are maybe on hold,but for aircrafts they are a student study worth.
One example is shown [Vous devez être inscrit et connecté pour voir cette image]

Bore 80 ,stroke 120 ,2400 rpm 60 horsepower and less mass and vibration than a Rotax 912

Kind regards

Niels Abildgaard a écrit:: To prove that the Junkerator concept, that is an AC generator on each crank ,can function the twin honda thing was tested.

Do you mean that there is no mechanical coupling between the two crankshafts of that Honda thing, Niels?

Sujet: Junkerator Dim 3 Mar 2013 - 17:16

Hello Frits

It is not nessecary with mechanical coupling.
I was in the Navy as Young man and can still remember the schock in ship when somebody coupled two AC generators onto same electric system with a too great phase difference.
I never got round to try it but if one stator can be adjusted 5 to 10 degree relative to the other ,during running ,variable compression will be possible.More than 10 degree and I do not think the AC interlocking works.

Kind regards

Niels

Sujet: V2 90 DEGREE Dim 3 Mar 2013 - 19:16

HELLO MAN !
The twin motor HONDA as the motor of House power supplying with special crankcase ? photos - [2 strokes] V2 90 degree, common crankcase,one carb 771973

or

And so , your motor is like JUNKER S airplane motor , no ? photos - [2 strokes] V2 90 degree, common crankcase,one carb 809262

photos - [2 strokes] V2 90 degree, common crankcase,one carb 980796

Sujet: V2 90 DEGREE Dim 3 Mar 2013 - 19:25

DETROIT DIESEL pour le V2 inversé et moteur de Marine et de locomotive pour celui à pistons opposés ( les bielles avec les tiges alternatives reliées aux pistons , par contre , de mémoire , je ne me rappelle plus les noms des constructeurs sauf le V2 type GM de l armée US de la WWII , MORSE , MAN ou ....?
PS : je ne comprends pas trés bien ce que vous dites en anglais ...Sorry ! photos - [2 strokes] V2 90 degree, common crankcase,one carb 980796

Sujet: V2 90 DEGREE Dim 3 Mar 2013 - 19:35

photos - [2 strokes] V2 90 degree, common crankcase,one carb 241515

OK !!!! je vois peut etre bien le grand intérét de ce moteur , c est la précompression double entre le piston et le joint de la tige "bielle" rectiligne et ce dernier et la partie inférieure de la tige "bielle" mais où sont les transferts ?
Que fait la police ?! lol!

En tout cas , c est intéressant ; Pensez vous que ce moteur soit plus intéressant en terme de rendement que l OPOPOC
américain ?
Encore mieux ? photos - [2 strokes] V2 90 degree, common crankcase,one carb 980796

Sujet: Opposed piston engines Lun 4 Mar 2013 - 7:12

Hello Pline
Fairbanks Morse are still selling opposed piston engines for making electricity from diesel or natural gas.Construction is from 1935 and the motor is still a high efficiency lowNOx engine.
The V2 aircraft scheme is more inspired by the very efficient marine engines made as crosshead and with one exhaust valve per cylinder.
If someone has a CAD model of a modern 125 cylinder and piston please let me use it for trying to construct the crankcase of an ultra simple V2 and let me compare with the latest 250 from Aprilia.
At my age it is very nice to play smarter than the wise guys and as no new 250 are made for the immidiate future ,nobody will prove me wrong.

Hello,
the main problem is the accumulation of heat on the pistons (internal parts are difficult to cool) photos - [2 strokes] V2 90 degree, common crankcase,one carb 980796

Nombre de messages : 36 Localisation : Denmark Date d'inscription : 26/02/2013

I found an old link

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and another with other pictures

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explaining in more details my visions for combustion engines.

At least I have made a crankshaft

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BONJOUR ! Où en étes vous de votre projet ? Y a t il un lien avec la technique du V4 Swissauto ?
Avez vous de nouvelles images de votre proto ? photos - [2 strokes] V2 90 degree, common crankcase,one carb 241515

Nombre de messages : 36 Localisation : Denmark Date d'inscription : 26/02/2013

Hello Pline

Excuse me for answering in English.

Thank You for welcoming,and I have made no great progress as wife died recently after long and painfull disease.
I have never heard of the V4 Swiss thing but it is probably 4 separate crank chambers and therefore uninteresting for my line of thougth.I am not thinking V2 aero anymore as the twin airscrew Junkers is much better.

Kind regards

Niels

Dear Niels,
My sympathies, inadequate as they are :-(

For the Swissauto V4, it had in fact two crankcases each serving two cylinders. In fact it was a "bent-boxer", in each pair the two pistons reached TDC together, by using offset crankpins. The downside is obvious, two crankpins joined by a web without main-bearing, so the cranks did not last very long.

Frits posted a photo of the crank on the site somewhere...

Nombre de messages : 36 Localisation : Denmark Date d'inscription : 26/02/2013

Thank You Graham

It becomes nessecary to try that 90 degree V2 thing I feel,and the cheapest and best way can be to take a MZ 125/150 crank

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and have a new/20mm longer wrist pin made.The discs were wildly overdimensioned to act as flywheel.This can leave material enough for proper counterweigthing.
Do You have an idea who could make such a 28 times 69mm wristpin?

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Déjà en français, j'aurais du mal à suivre, alors là, je suis perdu photos - [2 strokes] V2 90 degree, common crankcase,one carb 412241

Niels Abildgaard a écrit:: Do You have an idea who could make such a 23 times 76mm wristpin?

Sorry Niels, I'm not well connected to manufacturers. I think the special wrist-pins Aprilia used with the ends welded shut were made by Mahle, but I would guess costs would be high unless you ordered a few hundred.