For the diesel fans

http://www.neander-motors.com/

<http://www.peace65.freeserve.co.uk/Pictures/commercialprototypes.htm>

 

I like it.
Not sure about the geared cranks though.

Theo

 

The picture on the freeserve page looks good, the pics in the slideshow
of the chopper with the dual forks looks horrid.

JL
IMNSHO

 

"Don't you know its a cryin' shame, when you've got yourself to blame..."

big (Oh, you meant compression ignition fans, eh?)

 

I resisted downloading the Flash page and , now that I have, I'm in
agreement with you. I do like the concept of a motorcycle that will cruise
at low revs and lots of torque.

Theo

 

You need a Guzzi you do!

big (Oh, hang on...)

 

<applause>

JL

 

There is an article in latest Two Wheels on a diesel motorbike also.

Uses a three cylinder VW motor quite extensively modified.

Looks exciting!

robert

 

Strange design. I wonder if it reduces piston rock, too.
Interesting that the upstroke and downstroke are asymmetrical
.... if you look at the animation, the upstroke has the 'legs
together' and the downstroke the 'legs apart'.

I wonder if it's meant to be a 2-stroke or a 4-stroke diesel.
I'm guessing 4 because the animation [*] has two pistons rising
together, and it looks like maybe a cam sprocket on the front
crank. I suppose the flywheels are weighted to eliminate
the vibration.

They gloss over the fact that large numbers of cylinders don't
just provide better balance, they also provide a smoother
power delivery and more room for valves. I wonder how it
would compare to a square four?

-----sharks

[*] flashy website but crappy to navigate: try
Company > English > Motor Concept > Characteristics.

 

Oooeerr! Didn't know it was a porn site.

I gave up on the animation, 128K link.

How do more, presumably smaller, cylinders provide more room for valves?
There is a argument that says diesels get more efficient if the cylinders
displace more than one litre each.

Square four? That was, in it's Ariel form, an engineering disaster. Note how
many manufacturers are using that configuration now. (Two-smoke fours that
really want side of the crank-case induction don't count).

Theo

 

Just what we need... another 270+kg motorcycle.

Gary (or is it the engine that weighs 274?)

 

The one in Two Wheels (June I think - with MT 01 on cover) is closer to 200
kgs and a sports bike - looks encouraging.

 

No-one seems to be able to produce heads with more than 5 valves.
Well, except for that 8-valve oblong bore Honda. And there's a limit
to how big the valves can get before they limit your redline.

How many are using double cranks now!

The point is: taking the doubled crank as read, because it's used by
this design, if you attached the conrods to two separate pistons
above the two flywheels instead of one piston between them, wouldn't
you have the same nice balance but with twice as much displacement?

Of course cooling is likely to be tricky ...

-----sharks

 

Yep; someone here said it was a turbo but I read the article and it seems
to be naturally aspirated and making very good (theoretical) horsepower!
The proof is in the riding though and the reporter wasn't given one.
Clem

 

Turbo'd

ENGINE liquid cooled, three cylinder,
turbocharged and intercooled diesel
BORE X STROKE 76.3 x 87mm(1200cc)
COMPRESSION RATIO 16.0:1
FUELSYSTEM direct unit injection
RAKE/TRAIL 231/NA
WHEELBASE 1533mm
CLAIMED WET WEIGHT 205kg
FUEL CAPACITY 18L
AVERAGE FUEL CONSUMPTION 2.5L/100 km


"Isn't she beautiful?", Van der Starre asks proudly as 1 gaze at the
pulsating diesel engine in sheer disbelief.
programming of the fuel injection we changed everything. The engine
now produces an estimated 74.5kW at 400Orpm and more than 200Nm of
torque between 2500rpm and 5000rpm. It does 100 km/h in first gear,"
Kees explains.

Cheers, Bill

Bill_h

(remove the nospam bit for email)

 

~
Yeah but apart from that!

Umm.... LOOK OVER THERE! [sound of running feet]
Clem

 

Not at the moment no... but the best 2 stroke road bike of all time the
RG500 did use it. That wasn't killed by the engine configuration... it
simply faded away because people didn't buy large 2 stroke road bikes. [1]

G-S

[1] No correspondence will be entered into from Yamaha 500 fans... they
were less powerful and handled worse due to a dud front end.

 

X-No-archive: yes

The bit I snipped out said "excluding twin-crank two-smokes"!

I re-read Theo's post sober (a rare experience) and now I understand that he
was saying
"it was a disaster so no manufacturers are using that design now"
rather than the
"it was a disaster then but plenty of manufactures are using it successfully
now.." that I read it as.

Sobriety eh?... Who'd've thought!

 

Yeah... bugger eh...

I don't remember reading Theo's post (I must have missed it... or I was
pissed when I read it


G-S

 

Beer mate?

Theo