Another H.P. Research Phenomenon........!
#51
06-27-2005, 05:21 PM
Pro Rider
Has been here a long time!
Has been here a long time!
Another H.P. Research Phenomenon........!
Originally posted by: 222
For the guys out in California or close to it. Scott at West Coast ATV is VERY good. He is a HPR dealer and he knows what he is doing on a dyno. He owns the same dyno as HPR and gets the same HP numbers on his motor builds. Take advantage of it!
222
For the guys out in California or close to it. Scott at West Coast ATV is VERY good. He is a HPR dealer and he knows what he is doing on a dyno. He owns the same dyno as HPR and gets the same HP numbers on his motor builds. Take advantage of it!
222
#53
06-29-2005, 01:28 AM
#54
06-29-2005, 04:30 AM
Another H.P. Research Phenomenon........!
Hey 222 is Scott really good at west coast atv, because i am wanting to get the motor you guys just put together for me on the dyno to see roughly where we are at. Eric said we should be getting about 70 hp out of it. Maybe i will give him a call tommorrow. No matter what the dyno says these hp research bikes are hot.
#56
06-29-2005, 10:10 PM
#57
06-29-2005, 10:44 PM
#58
06-30-2005, 07:53 AM
#59
06-30-2005, 09:00 AM
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#60
06-30-2005, 10:08 AM
Another H.P. Research Phenomenon........!
Originally posted by: Oldmanracing
(Torque x Engine speed) / 5,252 = Horsepower
The engine that makes 300 pound-feet of torque at 4,000 RPM produces [(300 x 4,000) / 5,252] 228 horsepower at 4,000 RPM. But where does the number 5,252 come from?
To get from pound-feet of torque to horsepower, you need to go through a few conversions. The number 5,252 is the result of lumping several different conversion factors together into one number.
First, 1 horsepower is defined as 550 foot-pounds per second. The units of torque are pound-feet. So to get from torque to horsepower, you need the "per second" term. You get that by multiplying the torque by the engine speed.
But engine speed is normally referred to in revolutions per minute (RPM). Since we want a "per second," we need to convert RPMs to "something per second." The seconds are easy -- we just divide by 60 to get from minutes to seconds. Now what we need is a dimensionless unit for revolutions: a radian. A radian is actually a ratio of the length of an arc divided by the length of a radius, so the units of length cancel out and you're left with a dimensionless measure.
You can think of a revolution as a measurement of an angle. One revolution is 360 degrees of a circle. Since the circumference of a circle is (2 x pi x radius), there are 2-pi radians in a revolution. To convert revolutions per minute to radians per second, you multiply RPM by (2-pi/60), which equals 0.10472 radians per second. This gives us the "per second" we need to calculate horsepower.
Let's put this all together. We need to get to horsepower, which is 550 foot-pounds per second, using torque (pound-feet) and engine speed (RPM). If we divide the 550 foot-pounds by the 0.10472 radians per second (engine speed), we get 550/0.10472, which equals 5,252.
So if you multiply torque (in pound-feet) by engine speed (in RPM) and divide the product by 5,252, RPM is converted to "radians per second" and you can get from torque to horsepower -- from "pound-feet" to "foot-pounds per second."
(Torque x Engine speed) / 5,252 = Horsepower
The engine that makes 300 pound-feet of torque at 4,000 RPM produces [(300 x 4,000) / 5,252] 228 horsepower at 4,000 RPM. But where does the number 5,252 come from?
To get from pound-feet of torque to horsepower, you need to go through a few conversions. The number 5,252 is the result of lumping several different conversion factors together into one number.
First, 1 horsepower is defined as 550 foot-pounds per second. The units of torque are pound-feet. So to get from torque to horsepower, you need the "per second" term. You get that by multiplying the torque by the engine speed.
But engine speed is normally referred to in revolutions per minute (RPM). Since we want a "per second," we need to convert RPMs to "something per second." The seconds are easy -- we just divide by 60 to get from minutes to seconds. Now what we need is a dimensionless unit for revolutions: a radian. A radian is actually a ratio of the length of an arc divided by the length of a radius, so the units of length cancel out and you're left with a dimensionless measure.
You can think of a revolution as a measurement of an angle. One revolution is 360 degrees of a circle. Since the circumference of a circle is (2 x pi x radius), there are 2-pi radians in a revolution. To convert revolutions per minute to radians per second, you multiply RPM by (2-pi/60), which equals 0.10472 radians per second. This gives us the "per second" we need to calculate horsepower.
Let's put this all together. We need to get to horsepower, which is 550 foot-pounds per second, using torque (pound-feet) and engine speed (RPM). If we divide the 550 foot-pounds by the 0.10472 radians per second (engine speed), we get 550/0.10472, which equals 5,252.
So if you multiply torque (in pound-feet) by engine speed (in RPM) and divide the product by 5,252, RPM is converted to "radians per second" and you can get from torque to horsepower -- from "pound-feet" to "foot-pounds per second."
Daaaaaamn.... Joe you're just full of it......wait let me re-phrase that. You're full of useful information....I'll have to copy this all down for later reference....[img]i/expressions/face-icon-small-wink.gif[/img]