New Zongshen RX3 (ZS250GY-3) Dual Sport

[jimjr21]

25.6hp @ 8994 rpm
This is a brake dyno of some type. Easy to tell by the rpm time trace. Engine is at maximum rpm then is pulled down to lower rpm over 6 seconds. These types of dyno's are hard on engines.

[Weldangrind]

Originally Posted by jimjr21

25.6hp @ 8994 rpm
This is a brake dyno of some type. Easy to tell by the rpm time trace. Engine is at maximum rpm then is pulled down to lower rpm over 6 seconds. These types of dyno's are hard on engines.

I have no personal experience with dyno sheets, but I've reviewed several over the years. I am struggling to understand the inverse curve at the bottom of the graph, and I'm failing to get which curve represents torque.

[katflap]

Originally Posted by Weldangrind

I have no personal experience with dyno sheets, but I've reviewed several over the years. I am struggling to understand the inverse curve at the bottom of the graph, and I'm failing to get which curve represents torque.

I'm not sure but I think the inverse curve is the fuel consumption rate

Grams per kilowatt hour (g/kwh)

X axis Dyno rpm

y axis g/kwh on the right, goes up to 377.5

There seems to be 2 graphs in one going on here

The "Meo" curve seems to represent torque or at least the "torque revise" figures, what the hell that is I've no idea.

X axis dyno rpm

y axis (on right) Nm - ranging from 17.61 to 21.90 and above

[jimjr21]

Originally Posted by Weldangrind

I have no personal experience with dyno sheets, but I've reviewed several over the years. I am struggling to understand the inverse curve at the bottom of the graph, and I'm failing to get which curve represents torque.

Two curves at the bottom deal with fuel.

Straight upwards is amount of fuel used.

Inverse curve shows efficiency of transferring potential energy of fuel into mechanical energy.

[Weldangrind]

Originally Posted by katflap

I'm not sure but I think the inverse curve is the fuel consumption rate

Grams per kilowatt hour (g/kwh)

X axis Dyno rpm

y axis g/kwh on the right, goes up to 377.5

There seems to be 2 graphs in one going on here

The "Meo" curve seems to represent torque or at least the "torque revise" figures, what the hell that is I've no idea.

X axis dyno rpm

y axis (on right) Nm - ranging from 17.61 to 21.90 and above

Originally Posted by jimjr21

Two curves at the bottom deal with fuel.

Straight upwards is amount of fuel used.

Inverse curve shows efficiency of transferring potential energy of fuel into mechanical energy.

Thanks for the explanation, gentlemen. Fuel consumption vs. energy created hadn't occurred to me.

Can you further explain which curve is torque and which is hp? I think I know the answer, but I want to be sure.

[katflap]

Originally Posted by Weldangrind

Thanks for the explanation, gentlemen. Fuel consumption vs. energy created hadn't occurred to me.

Can you further explain which curve is torque and which is hp? I think I know the answer, but I want to be sure.

I think I've got this right

[Weldangrind]

Originally Posted by katflap

I think I've got this right

Excellent! I surmised that the bell curve was torque, and it is almost the inverse of the fuel consumption rate curve, which makes perfect sense.

I am a little confused by the RPM data; do you think the chart is posting both crankshaft RPM and gear reduction RPM at the clutch?

[katflap]

Originally Posted by Weldangrind

I am a little confused by the RPM data; do you think the chart is posting both crankshaft RPM and gear reduction RPM at the clutch?

Yes I think so,
From what I see the Graph is only showing the reduced Dyno RPM ,
though the crank shaft RPM and Dyno RPM is shown in the table above.

I've never seen a Dyno in action so i'm not sure what part of the set up is monitored to get the reduced RPM