Oddball engines and prototypes

[WilDun]

Just checked it out, all the videos which are posted directly into this forum have disappeared and all I can see is a blank, black picture where they should be. - so Husa's posts with videos I never get to see (most frequent)! ................ anybody able to help? - There must be a simple answer!

[husaberg]

Weird things happening here again - I'm just getting blank pictures (might be just videos of course) but it's annoying me!
Probably is only on my computer but just on this site.
Maybe I pressed a wrong button again somewhere! - can anybody give me a clue?, - I'm clueless! -

Your last video clip, (the one above) just shows up as a black screen! and it's the last of a lot of "no show" videos.

Its likely your browser what are you using Edge? i assume you are on Windows 10?

[WilDun]

Its likely your browser what are you using Edge? i assume you are on Windows 10?

Yes, Windows 10 but somewhere along the line (approx. one and a half weeks ago}, something changed - and I don't know what the hell "edge" is! I guess its the browser which comes with Windows 10, but I never use that. - but i'm pretty sure I've disturbed some setting or other.

[husaberg]

Yes, Windows 10 but somewhere along the line (approx. one and a half weeks ago}, something changed - and I don't know what the hell "edge" is! I guess its the browser which comes with Windows 10, but I never use that. - but i'm pretty sure I've disturbed some setting or other.

Just try reloading another browser, likely an update fixed it for you.
My old one never use to show the PNG pics that frits always posted until i saved them.
What logo does you broswer show an e?

[WilDun]

Ok thanks, all good now!

Problem actually was my WiFi adapter which was on the way out, (it finally bit the dust!).

[tjbw]

Just to kickstart this sluggish thread again!

Note: Even though I didn't reply to, or acknowledge them, I did find the last two posts very interesting.

These video clips are probably quite old but I admire this Aussie guy's enthusiasm - his design obviously works very well and I'm sure KEN in particular would be interested!
I am interested because it no doubt feels like a bike - If I rode a two wheeler and fell off, it would be curtains for me, such is my fragile physical state. so I would like to try something like this, I think that would definitely be the machine for me!

https://www.youtube.com/watch?v=-KBJOYkMob0
https://www.youtube.com/watch?v=dY3HthkejoI

What you need Will, is some protection over your head, like this little Rudezon. It's a modified Volvo car, with a V8 Evinrude boat engine

More info here: http://www.engineswapdepot.com/?p=5141

https://www.youtube.com/watch?v=mrhsUXnodfw

[WilDun]

What you need Will, is some protection over your head, like this little Rudezon. It's a modified Volvo car, with a V8 Evinrude boat engine

More info here: http://www.engineswapdepot.com/?p=5141

https://www.youtube.com/watch?v=mrhsUXnodfw

No,No, God forbid! - if I could manage to get into that contraption I'd never be able to climb out of it! - I ran out of space in my garage to keep my little Honda Gyro tilting trike (and my main lathe also) but I do like tilting vehicles, motorcycle feel, but with less risk of falling off!

I have always loved two strokes (especially in bikes), but there are still one or two things about them which irritate me a lot - One is the amount of embarrassing smoke they continue to emit, two is the embarrassing size of their exhaust chambers, especially in larger cylinder sizes and in multi cylinder engines, and also fuel consumption - all this no doubt can be overcome (at a cost) and would leave four strokes for dead in just about every respect, but in order to achieve that everything would have to become complicated, - a far cry from the "simple" two stroke of the past. Trouble these days is, with motorcycles, people will accept expense and complication, ie if it's fashionable and will gain them a couple of horses, even if they can't use them - except for bragging rights!
I think the two stroke could survive in snowmobiles, karts and aircraft and ( thanks to the work already being done) are surviving, also the scales could just be starting to waver towards the two stroke in motocross!

[WilDun]

Pity about the grotesque big chambers needed for two strokes! - needing monstrous things like this keeps them from production surely (for the road, not racing) - isn't there a better and neater option - like forced induction and lower exhaust ports? - ok I'll probably get my theory blown out of the water, but worth a try!
https://www.youtube.com/watch?v=kjJ1iYtg_OM

Then there's this engine which I first saw a few years back - it looked very promising then but no one seems to want to take it on! (tried and being tested by Ilmor, a well known company)
I wonder if this principle could be used in a two stroke to use up all that unburnt stuff which comes out of the exhaust? I guess the big disaster of the Wankel makes companies improve what they've got rather than make radical moves!
https://www.youtube.com/watch?v=u0uPmrSRM7w

[Michael Moore]

Pity about the grotesque big chambers needed for two strokes! - needing monstrous things like this keeps them from production surely (for the road, not racing)

But aren't the large ones meant for maximum RR power? I've got a Pro Circuit II pipe for a 250 KTM SX sitting here next to me, and the major diameter is just over 4", and this pipe is supposed to extend the power band (not necessarily increase the power) for another 1-1.5K RPM. So if you had a 500 2T twin making 100 hp would the exhausts be that much bigger than on an 4T? If you are looking for a milder engine with 60-70hp the exhausts would probably be smaller in diameter.

One advantage to the 2T engine is there's not a large sump hanging off the bottom of the engine getting in the way of tucking the exhaust in better.

Having to fit a couple of exhausts the size of the one on this Zabel RGV might be a big task.

Allegedly Walter Kaaden remarked that you know when the 2T exhaust is getting to be the right shape when you can't put it on the bike without it dragging on the ground, burning the rider, or requiring the relocation of some other major component (which might include the rider).

cheers,
Michael

[ken seeber]

The 5 stroke would fall under the category of a "bottoming cycle" principle where any waste energy is utilised. I would suppose the expansion chamber as we know it also falls into this category as it provides energy to over charge the cylinder.

This drum charger is perhaps an alternative.

http://newatlas.com/drum-charger-che...e-turbo/46648/

Maybe it is less obtrusive than an expansion chamber.

Back to the 5 stroke, possibly an adaption of this could be applied to a 2 stroke ?

[WilDun]

So if you had a 500 2T twin making 100 hp would the exhausts be that much bigger than on an 4T? If you are looking for a milder engine with 60-70hp the exhausts would probably be smaller in diameter.

That is probably quite true but I guess I was referring to large 700cc+ engines (as most road machinery is today). I think a large part of the problem is where the "fat part" is located in the pipe.
Sadly, the four stroke is now solidly ingrained in the minds of the younger generation most of whom did not grow up with the two stroke and who may not even have heard of a two stroke, except in chainsaws etc and now no longer fashionable - all very unfortunate!

One advantage to the 2T engine is there's not a large sump hanging off the bottom of the engine getting in the way of tucking the exhaust in better.

Maybe someone should have listened and realized the old designers (inspired no doubt by aircraft engines) were right after all, when they used dry sumps and oil tanks!

Allegedly Walter Kaaden remarked that you know when the 2T exhaust is getting to be the right shape when you can't put it on the bike without it dragging on the ground, burning the rider, or requiring the relocation of some other major component (which might include the rider).

There you go, - all those years ago he predicted what I was going to say!

[WilDun]

The 5 stroke would fall under the category of a "bottoming cycle" principle where any waste energy is utilised. I would suppose the expansion chamber as we know it also falls into this category as it provides energy to over charge the cylinder.

This drum charger is perhaps an alternative.

http://newatlas.com/drum-charger-che...e-turbo/46648/

Maybe it is less obtrusive than an expansion chamber.

Back to the 5 stroke, possibly an adaption of this could be applied to a 2 stroke ?

Looks quite simple and easier to tuck away because of the shape (even if it is big), maybe we could even locate it in the fairing!

If Ilmor took the 5 stroke concept seriously then it must have some merit!

[husaberg]

But aren't the large ones meant for maximum RR power? I've got a Pro Circuit II pipe for a 250 KTM SX sitting here next to me, and the major diameter is just over 4", and this pipe is supposed to extend the power band (not necessarily increase the power) for another 1-1.5K RPM. So if you had a 500 2T twin making 100 hp would the exhausts be that much bigger than on an 4T? If you are looking for a milder engine with 60-70hp the exhausts would probably be smaller in diameter.

I saw Lozza (2tinstitute) post a rule of thumb for air cooled RD350's on the net somewhere, the belly had to be kept ultra-small by modern std to avoid over scavenging the already too small crankcases.likely applies to tz350's as well.

[pete376403]

Looks quite simple and easier to tuck away because of the shape (even if it is big), maybe we could even locate it in the fairing!

If Ilmor took the 5 stroke concept seriously then it must have some merit!

Another supercharger/turbocharger that seemed to have merit, then disappeared was the Brown Boveri Pressure wave. Belt driven but used exhaust gas to directly compress intake air. Ferrari used it for a while in FI.

[Frits Overmars]

Another supercharger/turbocharger that seemed to have merit, then disappeared was the Brown Boveri Pressure wave. Belt driven but used exhaust gas to directly compress intake air. Ferrari used it for a while in FI.

This Brown Boveri supercharger became known as the Comprex. Mazda used to play with it too, in their 626 Capella.
I'm not sure whether we should call the Comprex a turbocharger because its rotary motion is not driven by an exhaust gas turbine, but it does use exhaust gas energy to compress the intake air. Development is still going on; today's version is called the Hyprex.