Boing .

CHECK referance %es , on Left . :shock:

http://www.epi-eng.com/piston_engine_te ... ngines.htm

CRIKEY :

" Figure 3: 90° After TDC
It is important to understand that the motion of the piston within 90° before and after TDC is not symmetric with the motion 90° before and after BDC. The rotation of the crankshaft when the crankpin is within 90° of TDC moves the piston substantially more than half the stroke value. Conversely, the rotation of the crankshaft when the crankpin is within 90° of BDC moves the piston substantially less than half the stroke value. This asymmetry of motion is important because it is the source of several interesting properties relating to the operation, performance and longevity of a piston engine."

http://www.epi-eng.com/piston_engine_te ... basics.htm

No Wonder they fitted ISOLASTICS . :wink:

Norton fitted isolastics so that they could sell commandos to the guys who used to ride motor scooters .

Troll ??
Everyone knows the mods and rockers hated each others g#ts.

Interesting graph Matt.
Thought Zebedee was going to come into it somewhere...
Expressing torque as a % of mean torque is a cheats way of making it seem grander than it is ?

Can we find a graph of the rotational speed of the crank, to show the cyclical torque loadings and accelerations and deccelerations.
Someone must have done it ?

Here's one that will confuse more than inform so keep looking as I've seem em and they show the crank jerking velocity

How many cylinders is that engine ?
Or, any explanation of that multi-sinusoidal pattern ??

For one cylinder, that is tough to fathom.
Unless its a MX bike going over the whoop-de-doos ?!

A bit Modern, Rohan .



" How many cylinders is that engine ? " looks like a V-8 with a fouled plug . :|

Matt Spencer said:

" How many cylinders is that engine ? " looks like a V-8 with a fouled plug . :|

Click to expand...

There are only 15 (evenly spaced) peaks in 720 degrees.... ??


Boooing said Zebedee

somewhere I've seen this in a more simple crank than this V8 with a misfire. What its shows is very fast jerking accelerations and decelerations spikes with this happening out of phase on different parts of the crank thus staining the snot out of the metal and harmonics. Thank goodness Norton are good enough for a good thrill but not launch to orbital escape rpm velocity. The more you understand about our engines the more they seem like elastic cartoon characters.

Where did this 'V8 with a misfire' bit come from ?

There are 15 evenly spaced peaks there, not the 8 highs and 8 lowers that you'd expect from a V8 ??
A misfire would show as a space for one of the peaks ?

And a sweet running engine you'd expect as all the highs and lows with similar amplitudes ?