Dyno Day.

[Cutty72]

Originally Posted by t-rock

Saron Pipe

FAIL

Saron
Roughly $1400 to get

http://www.youtube.com/watch?v=GQlpb8ewnRk

D&D
About $600

http://www.youtube.com/watch?v=o0A9nbjnCpo

[t-homo]

See two posts above.

[No Worries]

Originally Posted by Cutty72

...129.85 hp and topped out at 154 mph in 5th...If i can figure out where to hook up to get a tach signal, he'll run it again for free to get the torque specs as well...

130 hp at the rear wheel is very nice. Couldn't he take a tack reading off a spark plug wire?

Just to refresh everyone about engines: Engines make torque, not horsepower. The dyno measures torque and uses a formula to convert the torque to horsepower. Torque x engine speed/5,252 = HP. Therefore, torque and horsepower at 5,252 rpm are always equal. And an engine is most efficient near it's torque peak.

[Cutty72]

Originally Posted by No Worries

130 hp at the rear wheel is very nice. Couldn't he take a tack reading off a spark plug wire?

Just to refresh everyone about engines: Engines make torque, not horsepower. The dyno measures torque and uses a formula to convert the torque to horsepower. Torque x engine speed/5,252 = HP. Therefore, torque and horsepower at 5,252 rpm are always equal. And an engine is most efficient near it's torque peak.

Yup. Have to tear off the whole airbox assembly to get at the front one.
Didn't realize (until tonight) how easy it is to get at the rear... just remove the seat.

Provided there is no rain, I'll run it tomorrow night.

[Mr Lefty]

Originally Posted by No Worries

130 hp at the rear wheel is very nice. Couldn't he take a tack reading off a spark plug wire?

Just to refresh everyone about engines: Engines make torque, not horsepower. The dyno measures torque and uses a formula to convert the torque to horsepower. Torque x engine speed/5,252 = HP. Therefore, torque and horsepower at 5,252 rpm are always equal. And an engine is most efficient near it's torque peak.

so then how did they caculate the hp with out knowing the torque?!

[marko138]

D&D sucks. And the Saron looks like butt. Someone (DRUMMER!) needs to get one worked up that stays under the bike where it belongs.

[Cutty72]

Originally Posted by marko138

D&D sucks. And the Saron looks like butt. Someone (DRUMMER!) needs to get one worked up that stays under the bike where it belongs.

The saron is under the bike, but could be better looking.

I'm waiting for drummer or special ops to get something done.

[No Worries]

Originally Posted by Ebbs15

so then how did they caculate the hp with out knowing the torque?!

The dyno measures torque. You mean: How did they calculate hp without knowing the rpm? According to the formula, they have to know the engine's rpm in order to calculate the hp.

[Mr Lefty]

Originally Posted by No Worries

The dyno measures torque. You mean: How did they calculate hp without knowing the rpm? According to the formula, they have to know the engine's rpm in order to calculate the hp.

yeah that's what I meant... I wasn't questioning you NW... I know your right... I'm just wondering how the hell they got any reading at all...

[fnfalman]

Okay, let's back it up here and allow me to correct a few things. Without going into the whole course of thermodynamics and calculus and all that shits, I just want to say that the engine makes both TORQUE and HORSEPOWER.

Yes, it's true that you multiple torque by whatever number to get horsepower, BUT that does not mean that an engine makes only torque and horsepower is some sort of foofoo affair.

An engine makes Work (in this case known as torque). This Work (energy with unit of measurement such as Pound-Feet, Newton-Meter, Joule, etc.) generated over an amount of time (seconds, minutes, hours, months, years, etc.) equals Power. Power has many units of measurements (Watts, Horsepower, etc.) and in automotive we just happen to use Horsepower.

In the simplest thermodynamics terms, Energy = Work (not all the times but in this case it is) = Force x Distance. Hence you have Pound-Feet or Newton-Meter (aka Joules). Work/Time = Power (Joules/Second = Watt and Watt can be converted to Horsepower or any other units of measurements for Power).