Trying to understand a Dyno graph and the benefits of new cams
#11
11-16-2011, 08:51 PM
Elite HDF Member
#12
11-16-2011, 11:11 PM
#14
11-16-2011, 11:44 PM
#16
11-16-2011, 11:48 PM
Extreme HDF Member
#17
11-17-2011, 12:44 AM
"it is what it is" to paraphrase Popeye
at any engine speed the motor is producing power.
how can a motor turning 3000 rpm with WOT ( in which case it is moving past 3000 rpm to a higher speed) make less power at 3000 rpm with the throttle setting that maintains it there.
the motor will take the air it requires.
the throttle controls air to the motor.
Throttle position and engine vacuum will affect ignition timing, which will further affect tq/HP numbers....
I'd guess that a motor held at 3000 rpm would show higher HP numbers than same motor passing through 3000 rpm on it's way up. That would be due to the more advanced spark timing on a held motor
another variable would be lower afr on a WOT motor-- depending greatly on the fuel management system
- Hey, doing my best to answer the op's question.
Mike
Last edited by mkguitar; 11-17-2011 at 02:00 AM.
#18
11-17-2011, 01:23 AM
3000 ( or any, but lets use that) rpm is achieved at the throttle position which allows the correct amount of air and fuel to be there--- so "incidental" to the rpm.
"it is what it is" to paraphrase Popeye
at any engine speed the motor is producing power.
how can a motor turning 3000 rpm with WOT ( in which case it is moving past 3000 rpm to a higher speed) make less power at 3000 rpm with the throttle setting that maintains it there.
the motor will take the air it requires.
the throttle controls air to the motor.
Throttle position and engine vacuum will affect ignition timing, which will further affect tq/HP numbers....
I'd guess that a motor held at 3000 rpm would show higher HP numbers than same motor passing through 3000 rpm on it's way up. That would be due to the more advanced spark timing on a held motor
- Hey, doing my best to answer the op's question.
Mike
"it is what it is" to paraphrase Popeye
at any engine speed the motor is producing power.
how can a motor turning 3000 rpm with WOT ( in which case it is moving past 3000 rpm to a higher speed) make less power at 3000 rpm with the throttle setting that maintains it there.
the motor will take the air it requires.
the throttle controls air to the motor.
Throttle position and engine vacuum will affect ignition timing, which will further affect tq/HP numbers....
I'd guess that a motor held at 3000 rpm would show higher HP numbers than same motor passing through 3000 rpm on it's way up. That would be due to the more advanced spark timing on a held motor
- Hey, doing my best to answer the op's question.
Mike
#19
11-17-2011, 04:32 AM
Ultimate HDF Member
3000 ( or any, but lets use that) rpm is achieved at the throttle position which allows the correct amount of air and fuel to be there--- so "incidental" to the rpm.
"it is what it is" to paraphrase Popeye
at any engine speed the motor is producing power.
how can a motor turning 3000 rpm with WOT ( in which case it is moving past 3000 rpm to a higher speed) make less power at 3000 rpm with the throttle setting that maintains it there.
the motor will take the air it requires.
the throttle controls air to the motor.
Throttle position and engine vacuum will affect ignition timing, which will further affect tq/HP numbers....
I'd guess that a motor held at 3000 rpm would show higher HP numbers than same motor passing through 3000 rpm on it's way up. That would be due to the more advanced spark timing on a held motor
another variable would be lower afr on a WOT motor-- depending greatly on the fuel management system
- Hey, doing my best to answer the op's question.
Mike
"it is what it is" to paraphrase Popeye
at any engine speed the motor is producing power.
how can a motor turning 3000 rpm with WOT ( in which case it is moving past 3000 rpm to a higher speed) make less power at 3000 rpm with the throttle setting that maintains it there.
the motor will take the air it requires.
the throttle controls air to the motor.
Throttle position and engine vacuum will affect ignition timing, which will further affect tq/HP numbers....
I'd guess that a motor held at 3000 rpm would show higher HP numbers than same motor passing through 3000 rpm on it's way up. That would be due to the more advanced spark timing on a held motor
another variable would be lower afr on a WOT motor-- depending greatly on the fuel management system
- Hey, doing my best to answer the op's question.
Mike
You're making substantially more power at WOT at 3,000 rpm than you are cruising along at 3,000 rpm on a flat road. Engine load/throttle position plays a huge factor in this, hence the reason there are TPS/kPa axes in the fuel & timing tables.
#20
11-17-2011, 05:57 AM
Outstanding HDF Member
3000 ( or any, but lets use that) rpm is achieved at the throttle position which allows the correct amount of air and fuel to be there--- so "incidental" to the rpm.
"it is what it is" to paraphrase Popeye
at any engine speed the motor is producing power.
how can a motor turning 3000 rpm with WOT ( in which case it is moving past 3000 rpm to a higher speed) make less power at 3000 rpm with the throttle setting that maintains it there.
the motor will take the air it requires.
the throttle controls air to the motor.
Throttle position and engine vacuum will affect ignition timing, which will further affect tq/HP numbers....
I'd guess that a motor held at 3000 rpm would show higher HP numbers than same motor passing through 3000 rpm on it's way up. That would be due to the more advanced spark timing on a held motor
another variable would be lower afr on a WOT motor-- depending greatly on the fuel management system
- Hey, doing my best to answer the op's question.
Mike
"it is what it is" to paraphrase Popeye
at any engine speed the motor is producing power.
how can a motor turning 3000 rpm with WOT ( in which case it is moving past 3000 rpm to a higher speed) make less power at 3000 rpm with the throttle setting that maintains it there.
the motor will take the air it requires.
the throttle controls air to the motor.
Throttle position and engine vacuum will affect ignition timing, which will further affect tq/HP numbers....
I'd guess that a motor held at 3000 rpm would show higher HP numbers than same motor passing through 3000 rpm on it's way up. That would be due to the more advanced spark timing on a held motor
another variable would be lower afr on a WOT motor-- depending greatly on the fuel management system
- Hey, doing my best to answer the op's question.
Mike
Ummm, what?? I dyno tune for a living, an average bike on the dyno can acheive 6000 RPM's from 20% throttle up to 100% throttle. (And all the TP ranges in between). With your "theory" the dyno printouts for every one of these passes would be the same. That, my friend, just aint so.