100 HP dyno run
- britincali
- Posts: 8207
- Joined: May 31st, 2007, 7:10 pm
- Location: Barstow, CA
100 HP dyno run
What do you guys make of this......
http://www.thumpertalk.com/forum/showth ... 887&page=3
Ive never seen a dyno graph where the HP and TQ never cross
http://www.thumpertalk.com/forum/showth ... 887&page=3
Ive never seen a dyno graph where the HP and TQ never cross
Coolness list by 90cr500guy
Bob's = 50/50
Cepek = cool
Solidbro = cool
Brit = loser
Stoffer = 1 up from Brit
MFDB = cool
Danny = ok
Bob's = 50/50
Cepek = cool
Solidbro = cool
Brit = loser
Stoffer = 1 up from Brit
MFDB = cool
Danny = ok
- britincali
- Posts: 8207
- Joined: May 31st, 2007, 7:10 pm
- Location: Barstow, CA
- britincali
- Posts: 8207
- Joined: May 31st, 2007, 7:10 pm
- Location: Barstow, CA
-
- Posts: 4394
- Joined: July 4th, 2007, 6:57 pm
Formula for horsepower is HP = Tq X rpm divided by 5250.
So Tq and Hp will always cross at 5250.
Look at every dyno sheet. Right from idle there is always a Tq number and a low Hp number. As the RPM rises, the TQ rises a little but the HP goes up alot till it crosses at 5250 and keeps going.
My unofficial opinon and observation of this is Tq is what the dyno measures, then converts the number to Hp.
Conclusion, Hp is a by product of Tq and RPM.
So Tq and Hp will always cross at 5250.
Look at every dyno sheet. Right from idle there is always a Tq number and a low Hp number. As the RPM rises, the TQ rises a little but the HP goes up alot till it crosses at 5250 and keeps going.
My unofficial opinon and observation of this is Tq is what the dyno measures, then converts the number to Hp.
Conclusion, Hp is a by product of Tq and RPM.
'We are motorcycle people; we walk tall and we laugh at whatever’s funny. We shit on the chests of the Weird….' HST
- britincali
- Posts: 8207
- Joined: May 31st, 2007, 7:10 pm
- Location: Barstow, CA
- britincali
- Posts: 8207
- Joined: May 31st, 2007, 7:10 pm
- Location: Barstow, CA
- dannygraves
- Posts: 8020
- Joined: June 1st, 2007, 2:03 pm
- Location: Las Vegas, NV
correct me if I'm wrong, but I always thought the main difference between torque and horse power was time. I seem to remember the early calculations of horse power being how much it can move and how quickly.
if horse power was only torque x rpm / 5252 than wouldn't EVERYTHING have the same torque to HP curve?? how do you explain a motor with 60 lbft of torque and 90 hp vs a motor with 460lbft or torque and 300 hp and that would be time, the latter is a slow turning big v-8, so even though it has tons of torque is isn't tuned to to crank up rpms at all.
maybe I'm just going crazy.
if horse power was only torque x rpm / 5252 than wouldn't EVERYTHING have the same torque to HP curve?? how do you explain a motor with 60 lbft of torque and 90 hp vs a motor with 460lbft or torque and 300 hp and that would be time, the latter is a slow turning big v-8, so even though it has tons of torque is isn't tuned to to crank up rpms at all.
maybe I'm just going crazy.
'09 kx450f 4-Poke
Gen-4 trail bike --SOLD--
Gen-3 badass trail/mx bike --SOLD--
Gen-1 built dunes bike --SOLD--
'05 klx110 --SOLD--
'95 pw80
Gen-4 trail bike --SOLD--
Gen-3 badass trail/mx bike --SOLD--
Gen-1 built dunes bike --SOLD--
'05 klx110 --SOLD--
'95 pw80
Danny, this horsepower / torque stuff use to baffle me.
I always told that torque is the rotational movement and hosrspower is the figure used to move a certain distance.
Webster's defines horsepower as lifting 33,000 lbs one foot per minute.
Waas up wit dat.
I don't know where the formula came from, but it's what's used in the automotive world.
Torque is always more than Hp below 5250 and less than above.
Your two examples denotes one engine spinning at 7875 and the other at 3224.
Notice how diesels are rated for their torque?
It's because they don't go past 5250. Horsepower looks wimpy but the torque is off the chart.
I always told that torque is the rotational movement and hosrspower is the figure used to move a certain distance.
Webster's defines horsepower as lifting 33,000 lbs one foot per minute.
Waas up wit dat.
I don't know where the formula came from, but it's what's used in the automotive world.
Torque is always more than Hp below 5250 and less than above.
Your two examples denotes one engine spinning at 7875 and the other at 3224.
Notice how diesels are rated for their torque?
It's because they don't go past 5250. Horsepower looks wimpy but the torque is off the chart.
'We are motorcycle people; we walk tall and we laugh at whatever’s funny. We shit on the chests of the Weird….' HST
- britincali
- Posts: 8207
- Joined: May 31st, 2007, 7:10 pm
- Location: Barstow, CA
Ok I got a question that always baffled me, I used to be into tractors bigtime (laugh all you want) why are tractors always rated HP???
I had a 4.2l 4cyl diesel that was rated at 45 Hp (midsize), and another turbo diesel that was rated 82hp (bigtime power).... In the tractor world a 100 horse motor is a big ole monster 6 cyl turbo diesel, why are the ratings so low?
Why do they do it like that?
I had a 4.2l 4cyl diesel that was rated at 45 Hp (midsize), and another turbo diesel that was rated 82hp (bigtime power).... In the tractor world a 100 horse motor is a big ole monster 6 cyl turbo diesel, why are the ratings so low?
Why do they do it like that?
Coolness list by 90cr500guy
Bob's = 50/50
Cepek = cool
Solidbro = cool
Brit = loser
Stoffer = 1 up from Brit
MFDB = cool
Danny = ok
Bob's = 50/50
Cepek = cool
Solidbro = cool
Brit = loser
Stoffer = 1 up from Brit
MFDB = cool
Danny = ok
- britincali
- Posts: 8207
- Joined: May 31st, 2007, 7:10 pm
- Location: Barstow, CA
Most of 'em maxed out at around 2800 RPM, your 100hp example doesnt make sense to me tho, a 6cyl BIG turbo diesel should have a ton more than 291 TQMad Dog wrote:Because the rpm is low.
At what rpm did it make that power?
I.E. 100 Hp at 1800 rpm is 291 lbs ft. of torque.
Coolness list by 90cr500guy
Bob's = 50/50
Cepek = cool
Solidbro = cool
Brit = loser
Stoffer = 1 up from Brit
MFDB = cool
Danny = ok
Bob's = 50/50
Cepek = cool
Solidbro = cool
Brit = loser
Stoffer = 1 up from Brit
MFDB = cool
Danny = ok
Well, at 2800 rpm and 100 Hp, the Tq is only 188 lbs ft.
I don't much about tractor motors, but where is the sweet spot?
I'm guessing somewhere around 1800 - 2000 rpm.
That's where it is making it's peek Tq and is probably higher than the 188.
I also figure they have a HUGE flywheel for inertia. That coupled with adequate Tq alows them to get he job done.
I don't much about tractor motors, but where is the sweet spot?
I'm guessing somewhere around 1800 - 2000 rpm.
That's where it is making it's peek Tq and is probably higher than the 188.
I also figure they have a HUGE flywheel for inertia. That coupled with adequate Tq alows them to get he job done.
'We are motorcycle people; we walk tall and we laugh at whatever’s funny. We shit on the chests of the Weird….' HST
- britincali
- Posts: 8207
- Joined: May 31st, 2007, 7:10 pm
- Location: Barstow, CA
Mad Dog wrote:
I don't much about tractor motors, but where is the sweet spot?
I also figure they have a HUGE flywheel for inertia. That coupled with adequate Tq alows them to get he job done.
Yea the "sweet spot" is normally around 2200, and they do have really heavy flywheels.
It just always puzzled me as a kid how a YZ490 had more HP than a 4.2l diesel lol
Coolness list by 90cr500guy
Bob's = 50/50
Cepek = cool
Solidbro = cool
Brit = loser
Stoffer = 1 up from Brit
MFDB = cool
Danny = ok
Bob's = 50/50
Cepek = cool
Solidbro = cool
Brit = loser
Stoffer = 1 up from Brit
MFDB = cool
Danny = ok
Your question is a good one. These things used to bother me too.
The difference is in the torque, the real measurement.
Horsepower is just s product / function of rpm and Tq.
The YZ 490 has what 45-50 lbs ft. for Tq, where as the tractor has 200 + and comes on hard from 0 with a very linear spread.
The YZ probably couldn't even spin the flywheel.
The difference is in the torque, the real measurement.
Horsepower is just s product / function of rpm and Tq.
The YZ 490 has what 45-50 lbs ft. for Tq, where as the tractor has 200 + and comes on hard from 0 with a very linear spread.
The YZ probably couldn't even spin the flywheel.
'We are motorcycle people; we walk tall and we laugh at whatever’s funny. We shit on the chests of the Weird….' HST