[Proto]

A bit of a time waster, but quite fun.

A piston at the top of its stroke - visordown

[oldfogey]

Great thread, Proto, if raaaather long! I'm surprised no one discussed the difference between Newtonian mechanistic and Einsteinian relativistic physics in the process .

[luvtolean]

I felt myself getting dumber as I read.

The piston does indeed stop, for all practical purposes, at TDC and BDC. The forces exerted on the piston from the rod are quite negligible as it goes through its motion to begin it's downward stroke. If it's the combustion cycle, there will be some force exerted on the piston as it compresses the mixture, and then quite a bit more force exerted downward on the piston as the mixture lights off. If your engine is timed well, this even occurs just as the piston is starting down in the bore. There'll probably be a bit of up and down bob, and the piston will probably rock slightly depending on the angle of the rod. But it's quite the small amount.

During the exhaust stroke, the amount of movement at TDC will be damn near nothing.

The biggest effects on the time the piston is still is the rod/stroke ratio. A longer stroke ratio allows for more dwell at TDC. And as such, a more still piston.

[Proto]

I felt myself getting dumber as I read.

As a General Studies teacher told me many years ago, when setting me an assignment, "Start off by defining your terms!"

So on that basis, I rather liked this from page 11.

If, however, you wish to define "stopped" as "at rest", and "at rest" means "zero velocity and zero acceleration" then your piston isn't stopped whilst the engine is running

There is no incompatibility in the latter view, as under that definition of "stopped", the piston is quite capable of having zero velocity whilst remaining in motion

[Custom900]

Why did I read this again

[Baketech]

Got through about 6 posts before I went back to surfing free pr0n....

If you want to really get that crowd in a tizzy, ask them the velocity of an 11,000 rpm crankshaft....along it's centerline....

[Pete]

Originally Posted by Baketech

If you want to really get that crowd in a tizzy, ask them the velocity of an 11,000 rpm crankshaft....along it's centerline....

[luvtolean]

Originally Posted by Baketech

Got through about 6 posts before I went back to surfing free pr0n....

If you want to really get that crowd in a tizzy, ask them the velocity of an 11,000 rpm crankshaft....along it's centerline....

Well, at the molecular level...

[phobiaphobe]

This reminds of a story I read somewhere about Smokey Yunick.

[Proto]

Originally Posted by Baketech

Got through about 6 posts before I went back to surfing free pr0n....

If you want to really get that crowd in a tizzy, ask them the velocity of an 11,000 rpm crankshaft....along it's centerline....

Lazy boy. It gets more interesting around page 6

[CBR929RE]

Originally Posted by luvtolean

I felt myself getting dumber as I read.

for that very reason I had to stop reading halfway through page 3



I think Ink Ink said it best on page 2

You could say it never stops because you and it are travelling along the road.

really illustrates how downhill the arguement is gonna go.

[BladeRider93955]

Originally Posted by Baketech

Got through about 6 posts before I went back to surfing free pr0n....

Free Porn really I thought all those e-mails were bogus

[phobiaphobe]

Originally Posted by BladeRider93955

Free Porn really I thought all those e-mails were bogus

You should see how much he's increased his length and girth.

[Tornado bait]

From the perspective of the piston, it never moves at all. The entire bike and all it's surroundings get one hell of a shaking, though.

[RRWANTR]

Originally Posted by Tornado bait

From the perspective of the piston, it never moves at all. The entire bike and all it's surroundings get one hell of a shaking, though.

[stegen]

Originally Posted by luvtolean

The biggest effects on the time the piston is still is the rod/stroke ratio. A longer stroke ratio allows for...

yikes, stop right there, virgin ears.

[Tornado bait]

Originally Posted by luvtolean

Well, at the molecular level...

Wouldn't it be ironic if our universe was an atom of a piston in a bike of some giant alternate universe?

[phobiaphobe]

That'd be like, far out man.

[allred]

Originally Posted by oldfogey

Great thread, Proto, if raaaather long! I'm surprised no one discussed the difference between Newtonian mechanistic and Einsteinian relativistic physics in the process .

Talking of Issac and Albert.......If a locomotive weighing 500 tons, and pulling 75 rolling stock, is heading down the track at 60mph. And, a fly is coming in the opposite direction....and hits the front of the train head on, due to superior weight and inertia of the locomotive the fly will start going in the same direction as the train. So therefore the fly must stop at the instant it hits the train. Well, if the fly stops, then so must the train....right?

[BladeRider93955]

Originally Posted by allred

Talking of Issac and Albert.......If a locomotive weighing 500 tons, and pulling 75 rolling stock, is heading down the track at 60mph. And, a fly is coming in the opposite direction....and hits the front of the train head on, due to superior weight and inertia of the locomotive the fly will start going in the same direction as the train. So therefore the fly must stop at the instant it hits the train. Well, if the fly stops, then so must the train....right?

Now that's far out...you should post that on the original forum where this thread originated

[phobiaphobe]

Careful... we don't want to get into quantum theory. Makes my head spin.

[Tornado bait]

Are you saying there is a train in my engine?