Oddball engines and prototypes

[Frits Overmars]

I was looking at and would be very interested in straight line operation of a piston rod (this was discussed to death a while ago)

The discussion probably stopped because Flettner came to a decision and started putting his ideas in metal. Just wait and see.

[WilDun]

The discussion probably stopped because Flettner came to a decision and started putting his ideas in metal. Just wait and see.

Yes true, he sure is a "doer" and puts most of us to shame - I know he is keen to get his geared scheme in operation and I'd say he has some other stuff brewing, eg. the aircraft engine, all at much later stages which keep him busy (not forgetting his everyday "bread & butter" stuff as well).
However, (in defence of myself ) where would forums be without discussing stuff, coming up with crazy ideas and maybe having the odd laugh?

[ken seeber]

Nothing new, but interesting that this has seemingly gotten into production:

http://newatlas.com/yanmar-dtorque-1...utboard/51675/

I say not new, because I'm sure Lanchester did it well before Willy & I were even a twinkle in our parent's eyes.

[Niels Abildgaard]

Nothing new, but interesting that this has seemingly gotten into production:

http://newatlas.com/yanmar-dtorque-1...utboard/51675/

I say not new, because I'm sure Lanchester did it well before Willy & I were even a twinkle in our parent's eyes.

GM tried the scheme in an opposed piston two stroke diesel more than 25 yers ago.
Like all two strokes, pollution was a problem.
Noise also by the way and lousy scavenging.Each piston had a stroke around half the diameter.

[WilDun]

Nothing new, but interesting that this has seemingly gotten into production:

Well, I wouldn't be paying heaps just to end up with a more complicated and expensive piece of machinery, especially in the motorcycle version where they appear to have a fascination with doubling up on components (even the front forks).

Interesting that in some of the various other animations of that engine, the direction of rotation is different - on one, the power stroke goes on the "slow side" (so to speak) and the other rotates the opposite way with the power stroke on the "fast side" - can't figure that one out!
Check it out anyway:-
https://www.youtube.com/watch?v=gL0QyScysQk
https://www.youtube.com/watch?v=PKzl-GDAhto
Quite frankly I think neither is the optimum way of doing it! - but then, what the hell do I know!

I say not new, because I'm sure Lanchester did it well before Willy & I were even a twinkle in our parent's eyes. :

Yes Ken, that was a bloody long time ago! I arrived before the bomb went off, I think you arrived in the aftermath.

As for Dr Lanchester, maybe he should just have stuck to gearboxes! - but, in saying that, he did a lot of good work on balance shafts and I'm sure Flettner would agree with that!

[WilDun]

Another pregnant pause!(12 days) - but I'm still hoping for a comment on the direction of rotation on that Neander engine!
Direction of rotation on this thing would surely be of great significance - has it really got into production?

[tjbw]

Here's same video with English audio:

https://www.youtube.com/watch?v=zDANivoB4KE&t=6s this one has the better rotation direction

I'd prefer conventional single crank with balance shaft.

[Frits Overmars]

Here's same video with English audio: https://www.youtube.com/watch?v=zDANivoB4KE&t=6s

Maybe it's my twisted mind, but I was struck by the humour in a video showing an engine with two crankshafts per piston, starting with the words:
"What if there existed a way to make a diesel that was smoother, lighter or more compact?"

[WilDun]

Here's same video with English audio:

https://www.youtube.com/watch?v=zDANivoB4KE&t=6s this one has the better rotation direction

I'd prefer conventional single crank with balance shaft.

This is what I was getting at, https://www.youtube.com/watch?v=gL0QyScysQk (someone in their advertising company may have done this one by mistake).
I can't see any reason how this direction of rotation would work well, it would put huge angular forces on the conrod (on the power stroke) - anyway, I can't see a costly design like that ever working out and I agree that the single crank would be best.

Don't think the good old inline four will ever be dislodged!

Maybe it's my twisted mind, but I was struck by the humour in a video showing an engine with two crankshafts per piston, starting with the words:
"What if there existed a way to make a diesel that was smoother, lighter or more compact?"

Or maybe it's one of those trick videos designed for April 1, to make us feel silly when we realize that we got taken in!

[tjbw]

Yes Will, I know what you are getting at, and I agree, that's why I said the video with English audio has the better direction of rotation

I always felt that a desaxe cylinder could be beneficial, but Neander has a very big desaxe offset. I wonder if anyone has researched the optimum offset.

[WilDun]

Yes Will, I know what you are getting at, and I aggree, that's why I said the video with English audio has the better direction of rotation

I always felt that a desaxe cylinder could be beneficial, but Neander has a very big desaxe offset. I wonder if anyone has researched the optimum offset.

Yes, the "desaxe" effect of that thing certainly is pretty excessive and I'm sure nowhere near the optimum! (either way)!

Not sure if this is the place to ask, but I have a car engine/transmission question and maybe someone here can advise me ..... sorry to get away from bikes.

My wife is looking at a new Suzuki Swift and I found the top model now has a 1 Litre three cylinder turbo with direct injection (petrol)!
Of course, me (being me) and a bit suspicious of turbos had a drive in it just to confirm that it was shit - what a surprise! - It went like I couldn't believe! HEAPS of torque and it just kept on pulling! - but ...... is it likely to keep on doing that for the next 5 years or so?
I was just thinking that it's still a small highly stressed engine!

Alternative is a 1200cc (1240 actually) version, naturally aspirated and fine really, however with a CVT transmission as opposed to a 6 speed "normal" automatic in the turbo model (so I'm not too sure about turbos or CVT transmissions, even though our 2009 Nissan has CVT).

Also surprisingly, they all seem to have gone back to using "under square" engines.

Any advice? if you know - asap please before she makes a mistake

[husaberg]

Yes Will, I know what you are getting at, and I agree, that's why I said the video with English audio has the better direction of rotation

I always felt that a desaxe cylinder could be beneficial, but Neander has a very big desaxe offset. I wonder if anyone has researched the optimum offset.

Yamaha has on foul strokes hence the later YZF450;s and R1s.

[Grumph]

Yes, the "desaxe" effect of that thing certainly is pretty excessive and I'm sure nowhere near the optimum! (either way)!

Not sure if this is the place to ask, but I have a car engine/transmission question and maybe someone here can advise me ..... sorry to get away from bikes.

My wife is looking at a new Suzuki Swift and I found the top model now has a 1 Litre three cylinder turbo with direct injection (petrol)!
Of course, me (being me) and a bit suspicious of turbos had a drive in it just to confirm that it was shit - what a surprise! - It went like I couldn't believe! HEAPS of torque and it just kept on pulling! - but ...... is it likely to keep on doing that for the next 5 years or so?
I was just thinking that it's still a small highly stressed engine!

Alternative is a 1200cc (1240 actually) version, naturally aspirated and fine really, however with a CVT transmission as opposed to a 6 speed "normal" automatic in the turbo model (so I'm not too sure about turbos or CVT transmissions, even though our 2009 Nissan has CVT).

Also surprisingly, they all seem to have gone back to using "under square" engines.

Any advice? if you know - asap please before she makes a mistake

If you were in ChCh Will, I'd have no hesitation in saying go for either as we have a brilliant agent here. Gordon Holland - old motorcycle name.
If you're happy with the local agent it still shouldn't be a problem as Suzuki have good backup in NZ.
You pays yer money...Turbo Vs CVT. I've avoided CVT's so far. Few years from now and I won't have a choice but the bugs should be out by then...
Either will work for around town use.

[WilDun]

Turbo Vs CVT. I've avoided CVT's so far. Few years from now and I won't have a choice but the bugs should be out by then ........Either will work for around town use.

Think we might go with a Mazda 2 instead, they are "middle of the road" with already well proven mechanical parts, so now back to bikes - cars don't really interest me a lot anyway!

So, why is it that they don't seem keen to go for turbos and direct injection on bikes as well ?

[Kickaha]

I've avoided CVT's so far. Few years from now and I won't have a choice but the bugs should be out by then...

The work corolla was a CVT I didn't even notice for a couple of months as it felt no different than a normal auto, the previous Nissan one was a bit crap though